|This article is outdated. (May 2015)|
|Part of a series on|
|G E N E T I C S|
|History and topics|
DNA sequencing is the process of determining the precise order of nucleotides within a DNA molecule. It includes any method or technology that is used to determine the order of the four bases—adenine, guanine, cytosine, and thymine—in a strand of DNA. The advent of rapid DNA sequencing methods has greatly accelerated biological and medical research and discovery.
Knowledge of DNA sequences has become indispensable for basic biological research, and in numerous applied fields such as medical diagnosis, biotechnology, forensic biology, virology and biological systematics. The rapid speed of sequencing attained with modern DNA sequencing technology has been instrumental in the sequencing of complete DNA sequences, or genomes of numerous types and species of life, including the human genome and other complete DNA sequences of many animal, plant, and microbial species.
The first DNA sequences were obtained in the early 1970s by academic researchers using laborious methods based on two-dimensional chromatography. Following the development of fluorescence-based sequencing methods with a DNA sequencer, DNA sequencing has become easier and orders of magnitude faster.
- 1 Use of sequencing
- 2 The four canonical bases
- 3 History
- 4 Basic methods
- 5 Advanced methods and de novo sequencing
- 6 Next-generation methods
- 6.1 Massively parallel signature sequencing (MPSS)
- 6.2 Polony sequencing
- 6.3 454 pyrosequencing
- 6.4 Illumina (Solexa) sequencing
- 6.5 SOLiD sequencing
- 6.6 Ion Torrent semiconductor sequencing
- 6.7 DNA nanoball sequencing
- 6.8 Heliscope single molecule sequencing
- 6.9 Single molecule real time (SMRT) sequencing
- 7 Methods in development
- 8 Sample preparation
- 9 Development initiatives
- 10 Computational challenges
- 11 Ethical issues
- 12 See also
- 13 References
- 14 External links
Use of sequencing
DNA sequencing may be used to determine the sequence of individual genes, larger genetic regions (i.e. clusters of genes or operons), full chromosomes or entire genomes. Sequencing provides the order of individual nucleotides present in molecules of DNA or RNA isolated from animals, plants, bacteria, archaea, or virtually any other source of genetic information. This information is useful to various fields of biology and other sciences, medicine, forensics, and other areas of study.
Sequencing is used in molecular biology to study genomes and the proteins they encode. Information obtained using sequencing allows researchers to identify changes in genes, associations with diseases and phenotypes, and identify potential drug targets.
DNA sequencing is used in evolutionary biology to study how different organisms are related and how they evolved.
The field of metagenomics involves identification of organisms present in a body of water, sewage, dirt, debris filtered from the air, or swab samples from organisms. Knowing which organisms are present in a particular environment is critical to research in ecology, epidemiology, microbiology, and other fields. Sequencing enables researchers to determine which types of microbes may be present in a microbiome, for example.
Medical technicians may sequence genes (or, theoretically, full genomes) from human patients to determine their risk of genetic diseases. This is a form of genetic testing, though some genetic tests may not involve DNA sequencing.
The four canonical bases
The canonical structure of DNA has four bases: thymine (T), adenine (A), cytosine (C), and guanine (G). DNA sequencing is the determination of the physical order of these bases in a molecule of DNA. However, there are many other bases that may be present in a molecule. In some viruses (specifically, bacteriophage), cytosine may be replaced by hydroxy methyl or hydroxy methyl glucose cytosine. In mammalian DNA, variant bases with methyl groups or phosphosulfate may be found. Depending on the sequencing technique, a particular modification may or may not be detected, e.g., the 5mC (5 methyl cytosine) common in humans may or may not be detected.
Deoxyribonucleic acid (DNA) was first discovered and isolated by Friedrich Miescher in 1869, but it remained understudied for many decades because proteins, rather than DNA, were thought to hold the genetic blueprint to life. This situation changed after 1944 as a result of some experiments by Oswald Avery, Colin MacLeod, and Maclyn McCarty demonstrated that purified DNA could change one strain of bacteria into another type. This was the first time that DNA was shown capable of transforming the properties of cells.
In 1953 James Watson and Francis Crick put forward their double-helix model of DNA which depicted DNA being made up of two strands of nucleotides coiled around each other, linked together by hydrogen bodds, in a spiral configuration. Each strand they argued was composed of four complementary nucleotides: adenine (A), cytosine (C), guanine (G) and thymine (T) and was oriented in opposite directions. Such a structure they proposed allowed each strand to reconstruct the other and was central to the passing on of hereditary information between generations.
The foundation for sequencing DNA was first laid by the work of Fred Sanger who by 1955 had completed the sequence of all the amino acids in insulin, a small protein secreted by the pancreas. This provided the first conclusive evidence that proteins were chemical entities with a specific molecular pattern rather than a random mixture of material suspended in fluid. Sanger's success in sequencing insulin greatly electrified x-ray crystallographers, including Watson and Crick who by now were trying to understand how DNA directed the formation of proteins within a cell. Soon after attending a series of lectures given by Fred Sanger in October 1954, Crick began to develop a theory which argued that the arrangement of nucleotides in DNA determined the sequence of amino acids in proteins which in turn helped determine the function of a protein. He published this theory in 1958. 
RNA sequencing was one of the earliest forms of nucleotide sequencing. The major landmark of RNA sequencing is the sequence of the first complete gene and the complete genome of Bacteriophage MS2, identified and published by Walter Fiers and his coworkers at the University of Ghent (Ghent, Belgium), in 1972 and 1976.
Early DNA sequencing methods
The first method for determining DNA sequences involved a location-specific primer extension strategy established by Ray Wu at Cornell University in 1970. DNA polymerase catalysis and specific nucleotide labeling, both of which figure prominently in current sequencing schemes, were used to sequence the cohesive ends of lambda phage DNA Between 1970 and 1973, Wu, R Padmanabhan and colleagues demonstrated that this method can be employed to determine any DNA sequence using synthetic location-specific primers. Frederick Sanger then adopted this primer-extension strategy to develop more rapid DNA sequencing methods at the MRC Centre, Cambridge, UK and published a method for "DNA sequencing with chain-terminating inhibitors" in 1977. Walter Gilbert and Allan Maxam at Harvard also developed sequencing methods, including one for "DNA sequencing by chemical degradation". In 1973, Gilbert and Maxam reported the sequence of 24 basepairs using a method known as wandering-spot analysis. Advancements in sequencing were aided by the concurrent development of recombinant DNA technology, allowing DNA samples to be isolated from sources other than viruses.
Sequencing of full genomes
The first full DNA genome to be sequenced was that of bacteriophage φX174 in 1977. Medical Research Council scientists deciphered the complete DNA sequence of the Epstein-Barr virus in 1984, finding it contained 172,282 nucleotides. Completion of the sequence marked a significant turning point in DNA sequencing because it was achieved with no prior genetic profile knowledge of the virus.
A non-radioactive method for transferring the DNA molecules of sequencing reaction mixtures onto an immobilizing matrix during electrophoresis was developed by Pohl and co-workers in the early 80’s. Followed by the commercialization of the DNA sequencer "Direct-Blotting-Electrophoresis-System GATC 1500" by GATC Biotech, which was intensively used in the framework of the EU genome-sequencing programme, the complete DNA sequence of the yeast Saccharomyces cerevisiae chromosome II. Leroy E. Hood's laboratory at the California Institute of Technology announced the first semi-automated DNA sequencing machine in 1986. This was followed by Applied Biosystems' marketing of the first fully automated sequencing machine, the ABI 370, in 1987 and by Dupont's Genesis 2000 which used a novel fluorescent labeling technique enabling all four dideoxynucleotides to be identified in a single lane. By 1990, the U.S. National Institutes of Health (NIH) had begun large-scale sequencing trials on Mycoplasma capricolum, Escherichia coli, Caenorhabditis elegans, and Saccharomyces cerevisiae at a cost of US$0.75 per base. Meanwhile, sequencing of human cDNA sequences called expressed sequence tags began in Craig Venter's lab, an attempt to capture the coding fraction of the human genome. In 1995, Venter, Hamilton Smith, and colleagues at The Institute for Genomic Research (TIGR) published the first complete genome of a free-living organism, the bacterium Haemophilus influenzae. The circular chromosome contains 1,830,137 bases and its publication in the journal Science marked the first published use of whole-genome shotgun sequencing, eliminating the need for initial mapping efforts.
Next-generation sequencing methods
Several new methods for DNA sequencing were developed in the mid to late 1990s and were implemented in commercial DNA sequencers by the year 2000.
On October 26, 1990, Roger Tsien, Pepi Ross, Margaret Fahnestock and Allan J Johnston filed a patent describing stepwise ("base-by-base") sequencing with removable 3' blockers on DNA arrays (blots and single DNA molecules). In 1996, Pål Nyrén and his student Mostafa Ronaghi at the Royal Institute of Technology in Stockholm published their method of pyrosequencing.
On April 1, 1997, Pascal Mayer and Laurent Farinelli submitted patents to the World Intellectual Property Organization describing DNA colony sequencing. The DNA sample preparation and random surface-PCR arraying methods described in this patent, coupled to Roger Tsien et al.'s "base-by-base" sequencing method, is now implemented in Illumina's Hi-Seq genome sequencers.
Lynx Therapeutics published and marketed "Massively parallel signature sequencing", or MPSS, in 2000. This method incorporated a parallelized, adapter/ligation-mediated, bead-based sequencing technology and served as the first commercially available "next-generation" sequencing method, though no DNA sequencers were sold to independent laboratories.
In 2004, 454 Life Sciences marketed a parallelized version of pyrosequencing. The first version of their machine reduced sequencing costs 6-fold compared to automated Sanger sequencing, and was the second of the new generation of sequencing technologies, after MPSS.
The large quantities of data produced by DNA sequencing have also required development of new methods and programs for sequence analysis. Phil Green and Brent Ewing of the University of Washington described their phred quality score for sequencer data analysis in 1998.
Allan Maxam and Walter Gilbert published a DNA sequencing method in 1977 based on chemical modification of DNA and subsequent cleavage at specific bases. Also known as chemical sequencing, this method allowed purified samples of double-stranded DNA to be used without further cloning. This method's use of radioactive labeling and its technical complexity discouraged extensive use after refinements in the Sanger methods had been made.
Maxam-Gilbert sequencing requires radioactive labeling at one 5' end of the DNA and purification of the DNA fragment to be sequenced. Chemical treatment then generates breaks at a small proportion of one or two of the four nucleotide bases in each of four reactions (G, A+G, C, C+T). The concentration of the modifying chemicals is controlled to introduce on average one modification per DNA molecule. Thus a series of labeled fragments is generated, from the radiolabeled end to the first "cut" site in each molecule. The fragments in the four reactions are electrophoresed side by side in denaturing acrylamide gels for size separation. To visualize the fragments, the gel is exposed to X-ray film for autoradiography, yielding a series of dark bands each corresponding to a radiolabeled DNA fragment, from which the sequence may be inferred.
The chain-termination method developed by Frederick Sanger and coworkers in 1977 soon became the method of choice, owing to its relative ease and reliability. When invented, the chain-terminator method used fewer toxic chemicals and lower amounts of radioactivity than the Maxam and Gilbert method. Because of its comparative ease, the Sanger method was soon automated and was the method used in the first generation of DNA sequencers.
Sanger sequencing is the method which prevailed from the 80's until the mid-2000s. Over that period, great advances were made in the technique, such as fluorescent labelling, capillary electrophoresis, and general automation. These developments allowed much more efficient sequencing, leading to lower costs. The Sanger method, in mass production form, is the technology which produced the first human genome in 2001, ushering in the age of genomics. However, later in the decade, radically different approaches reached the market, bringing the cost per genome down from $100 million in 2001 to $10,000 in 2011.
Advanced methods and de novo sequencing
Large-scale sequencing often aims at sequencing very long DNA pieces, such as whole chromosomes, although large-scale sequencing can also be used to generate very large numbers of short sequences, such as found in phage display. For longer targets such as chromosomes, common approaches consist of cutting (with restriction enzymes) or shearing (with mechanical forces) large DNA fragments into shorter DNA fragments. The fragmented DNA may then be cloned into a DNA vector and amplified in a bacterial host such as Escherichia coli. Short DNA fragments purified from individual bacterial colonies are individually sequenced and assembled electronically into one long, contiguous sequence. Studies have shown that adding a size selection step to collect DNA fragments of uniform size can improve sequencing efficiency and accuracy of the genome assembly. In these studies, automated sizing has proven to be more reproducible and precise than manual gel sizing.
The term "de novo sequencing" specifically refers to methods used to determine the sequence of DNA with no previously known sequence. De novo translates from Latin as "from the beginning". Gaps in the assembled sequence may be filled by primer walking. The different strategies have different tradeoffs in speed and accuracy; shotgun methods are often used for sequencing large genomes, but its assembly is complex and difficult, particularly with sequence repeats often causing gaps in genome assembly.
Most sequencing approaches use an in vitro cloning step to amplify individual DNA molecules, because their molecular detection methods are not sensitive enough for single molecule sequencing. Emulsion PCR isolates individual DNA molecules along with primer-coated beads in aqueous droplets within an oil phase. A polymerase chain reaction (PCR) then coats each bead with clonal copies of the DNA molecule followed by immobilization for later sequencing. Emulsion PCR is used in the methods developed by Marguilis et al. (commercialized by 454 Life Sciences), Shendure and Porreca et al. (also known as "Polony sequencing") and SOLiD sequencing, (developed by Agencourt, later Applied Biosystems, now Life Technologies).
Shotgun sequencing is a sequencing method designed for analysis of DNA sequences longer than 1000 base pairs, up to and including entire chromosomes. This method requires the target DNA to be broken into random fragments. After sequencing individual fragments, the sequences can be reassembled on the basis of their overlapping regions.
Another method for in vitro clonal amplification is bridge PCR, in which fragments are amplified upon primers attached to a solid surface and form "DNA colonies" or "DNA clusters". This method is used in the Illumina Genome Analyzer sequencers. Single-molecule methods, such as that developed by Stephen Quake's laboratory (later commercialized by Helicos) are an exception: they use bright fluorophores and laser excitation to detect base addition events from individual DNA molecules fixed to a surface, eliminating the need for molecular amplification.
Next-generation sequencing applies to genome sequencing, genome resequencing, transcriptome profiling (RNA-Seq), DNA-protein interactions (ChIP-sequencing), and epigenome characterization. Resequencing is necessary, because the genome of a single individual of a species will not indicate all of the genome variations among other individuals of the same species.
The high demand for low-cost sequencing has driven the development of high-throughput sequencing (or next-generation sequencing) technologies that parallelize the sequencing process, producing thousands or millions of sequences concurrently. High-throughput sequencing technologies are intended to lower the cost of DNA sequencing beyond what is possible with standard dye-terminator methods. In ultra-high-throughput sequencing as many as 500,000 sequencing-by-synthesis operations may be run in parallel.
|Method||Read length||Accuracy (single read not consensus)||Reads per run||Time per run||Cost per 1 million bases (in US$)||Advantages||Disadvantages|
|Single-molecule real-time sequencing (Pacific Biosciences)||10,000 bp to 15,000 bp avg (14,000 bp N50); maximum read length >40,000 bases||87% single-read accuracy||50,000 per SMRT cell, or 500–1000 megabases||30 minutes to 4 hours||$0.13–$0.60||Longest read length. Fast. Detects 4mC, 5mC, 6mA.||Moderate throughput. Equipment can be very expensive.|
|Ion semiconductor (Ion Torrent sequencing)||up to 400 bp||98%||up to 80 million||2 hours||$1||Less expensive equipment. Fast.||Homopolymer errors.|
|Pyrosequencing (454)||700 bp||99.9%||1 million||24 hours||$10||Long read size. Fast.||Runs are expensive. Homopolymer errors.|
|Sequencing by synthesis (Illumina)||50 to 300 bp||99.9% (Phred30)||up to 6 billion (TruSeq paired-end)||1 to 11 days, depending upon sequencer and specified read length||$0.05 to $0.15||Potential for high sequence yield, depending upon sequencer model and desired application.||Equipment can be very expensive. Requires high concentrations of DNA.|
|Sequencing by ligation (SOLiD sequencing)||50+35 or 50+50 bp||99.9%||1.2 to 1.4 billion||1 to 2 weeks||$0.13||Low cost per base.||Slower than other methods. Have issue sequencing palindromic sequence.|
|Chain termination (Sanger sequencing)||400 to 900 bp||99.9%||N/A||20 minutes to 3 hours||$2400||Long individual reads. Useful for many applications.||More expensive and impractical for larger sequencing projects. This method also requires the time consuming step of plasmid cloning.|
Massively parallel signature sequencing (MPSS)
The first of the next-generation sequencing technologies, massively parallel signature sequencing (or MPSS), was developed in the 1990s at Lynx Therapeutics, a company founded in 1992 by Sydney Brenner and Sam Eletr. MPSS was a bead-based method that used a complex approach of adapter ligation followed by adapter decoding, reading the sequence in increments of four nucleotides. This method made it susceptible to sequence-specific bias or loss of specific sequences. Because the technology was so complex, MPSS was only performed 'in-house' by Lynx Therapeutics and no DNA sequencing machines were sold to independent laboratories. Lynx Therapeutics merged with Solexa (later acquired by Illumina) in 2004, leading to the development of sequencing-by-synthesis, a simpler approach acquired from Manteia Predictive Medicine, which rendered MPSS obsolete. However, the essential properties of the MPSS output were typical of later "next-generation" data types, including hundreds of thousands of short DNA sequences. In the case of MPSS, these were typically used for sequencing cDNA for measurements of gene expression levels.
The Polony sequencing method, developed in the laboratory of George M. Church at Harvard, was among the first next-generation sequencing systems and was used to sequence a full E. coli genome in 2005. It combined an in vitro paired-tag library with emulsion PCR, an automated microscope, and ligation-based sequencing chemistry to sequence an E. coli genome at an accuracy of >99.9999% and a cost approximately 1/9 that of Sanger sequencing. The technology was licensed to Agencourt Biosciences, subsequently spun out into Agencourt Personal Genomics, and eventually incorporated into the Applied Biosystems SOLiD platform. Applied Biosystems was later acquired by Life Technologies, now part of Thermo Fisher Scientific.
A parallelized version of pyrosequencing was developed by 454 Life Sciences, which has since been acquired by Roche Diagnostics. The method amplifies DNA inside water droplets in an oil solution (emulsion PCR), with each droplet containing a single DNA template attached to a single primer-coated bead that then forms a clonal colony. The sequencing machine contains many picoliter-volume wells each containing a single bead and sequencing enzymes. Pyrosequencing uses luciferase to generate light for detection of the individual nucleotides added to the nascent DNA, and the combined data are used to generate sequence read-outs. This technology provides intermediate read length and price per base compared to Sanger sequencing on one end and Solexa and SOLiD on the other.
Illumina (Solexa) sequencing
Solexa, now part of Illumina, was founded by Shankar Balasubramanian and David Klenerman in 1998, and developed a sequencing method based on reversible dye-terminators technology, and engineered polymerases. The terminated chemistry was developed internally at Solexa and the concept of the Solexa system was invented by Balasubramanian and Klenerman from Cambridge University's chemistry department. In 2004, Solexa acquired the company Manteia Predictive Medicine in order to gain a massivelly parallel sequencing technology invented in 1997 by Pascal Mayer and Laurent Farinelli. It is based on "DNA Clusters" or "DNA colonies", which involves the clonal amplification of DNA on a surface. The cluster technology was co-acquired with Lynx Therapeutics of California. Solexa Ltd. later merged with Lynx to form Solexa Inc.
In this method, DNA molecules and primers are first attached on a slide or flow cell and amplified with polymerase so that local clonal DNA colonies, later coined "DNA clusters", are formed. To determine the sequence, four types of reversible terminator bases (RT-bases) are added and non-incorporated nucleotides are washed away. A camera takes images of the fluorescently labeled nucleotides. Then the dye, along with the terminal 3' blocker, is chemically removed from the DNA, allowing for the next cycle to begin. Unlike pyrosequencing, the DNA chains are extended one nucleotide at a time and image acquisition can be performed at a delayed moment, allowing for very large arrays of DNA colonies to be captured by sequential images taken from a single camera.
Decoupling the enzymatic reaction and the image capture allows for optimal throughput and theoretically unlimited sequencing capacity. With an optimal configuration, the ultimately reachable instrument throughput is thus dictated solely by the analog-to-digital conversion rate of the camera, multiplied by the number of cameras and divided by the number of pixels per DNA colony required for visualizing them optimally (approximately 10 pixels/colony). In 2012, with cameras operating at more than 10 MHz A/D conversion rates and available optics, fluidics and enzymatics, throughput can be multiples of 1 million nucleotides/second, corresponding roughly to 1 human genome equivalent at 1x coverage per hour per instrument, and 1 human genome re-sequenced (at approx. 30x) per day per instrument (equipped with a single camera).
Applied Biosystems' (now a Life Technologies brand) SOLiD technology employs sequencing by ligation. Here, a pool of all possible oligonucleotides of a fixed length are labeled according to the sequenced position. Oligonucleotides are annealed and ligated; the preferential ligation by DNA ligase for matching sequences results in a signal informative of the nucleotide at that position. Before sequencing, the DNA is amplified by emulsion PCR. The resulting beads, each containing single copies of the same DNA molecule, are deposited on a glass slide. The result is sequences of quantities and lengths comparable to Illumina sequencing. This sequencing by ligation method has been reported to have some issue sequencing palindromic sequences.
Ion Torrent semiconductor sequencing
Ion Torrent Systems Inc. (now owned by Life Technologies) developed a system based on using standard sequencing chemistry, but with a novel, semiconductor based detection system. This method of sequencing is based on the detection of hydrogen ions that are released during the polymerisation of DNA, as opposed to the optical methods used in other sequencing systems. A microwell containing a template DNA strand to be sequenced is flooded with a single type of nucleotide. If the introduced nucleotide is complementary to the leading template nucleotide it is incorporated into the growing complementary strand. This causes the release of a hydrogen ion that triggers a hypersensitive ion sensor, which indicates that a reaction has occurred. If homopolymer repeats are present in the template sequence multiple nucleotides will be incorporated in a single cycle. This leads to a corresponding number of released hydrogens and a proportionally higher electronic signal.
DNA nanoball sequencing
DNA nanoball sequencing is a type of high throughput sequencing technology used to determine the entire genomic sequence of an organism. The company Complete Genomics uses this technology to sequence samples submitted by independent researchers. The method uses rolling circle replication to amplify small fragments of genomic DNA into DNA nanoballs. Unchained sequencing by ligation is then used to determine the nucleotide sequence. This method of DNA sequencing allows large numbers of DNA nanoballs to be sequenced per run and at low reagent costs compared to other next generation sequencing platforms. However, only short sequences of DNA are determined from each DNA nanoball which makes mapping the short reads to a reference genome difficult. This technology has been used for multiple genome sequencing projects and is scheduled to be used for more.
Heliscope single molecule sequencing
Heliscope sequencing is a method of single-molecule sequencing developed by Helicos Biosciences. It uses DNA fragments with added poly-A tail adapters which are attached to the flow cell surface. The next steps involve extension-based sequencing with cyclic washes of the flow cell with fluorescently labeled nucleotides (one nucleotide type at a time, as with the Sanger method). The reads are performed by the Heliscope sequencer. The reads are short, averaging 35 bp. In 2009 a human genome was sequenced using the Heliscope, however in 2012 the company went bankrupt.
Single molecule real time (SMRT) sequencing
SMRT sequencing is based on the sequencing by synthesis approach. The DNA is synthesized in zero-mode wave-guides (ZMWs) – small well-like containers with the capturing tools located at the bottom of the well. The sequencing is performed with use of unmodified polymerase (attached to the ZMW bottom) and fluorescently labelled nucleotides flowing freely in the solution. The wells are constructed in a way that only the fluorescence occurring by the bottom of the well is detected. The fluorescent label is detached from the nucleotide upon its incorporation into the DNA strand, leaving an unmodified DNA strand. According to Pacific Biosciences (PacBio), the SMRT technology developer, this methodology allows detection of nucleotide modifications (such as cytosine methylation). This happens through the observation of polymerase kinetics. This approach allows reads of 20,000 nucleotides or more, with average read lengths of 5 kilobases.
Methods in development
DNA sequencing methods currently under development include reading the sequence as a DNA strand transits through nanopores, and microscopy-based techniques, such as atomic force microscopy or transmission electron microscopy that are used to identify the positions of individual nucleotides within long DNA fragments (>5,000 bp) by nucleotide labeling with heavier elements (e.g., halogens) for visual detection and recording. Third generation technologies aim to increase throughput and decrease the time to result and cost by eliminating the need for excessive reagents and harnessing the processivity of DNA polymerase.
Nanopore DNA sequencing
This method is based on the readout of electrical signals occurring at nucleotides passing by alpha-hemolysin pores covalently bound with cyclodextrin. The DNA passing through the nanopore changes its ion current. This change is dependent on the shape, size and length of the DNA sequence. Each type of the nucleotide blocks the ion flow through the pore for a different period of time. The method has a potential of development as it does not require modified nucleotides, however single nucleotide resolution is not yet available.
Two main areas of nanopore sequencing in development are solid state nanopore sequencing, and protein based nanopore sequencing. Protein nanopore sequencing utilizes membrane protein complexes ∝-Hemolysin and MspA (Mycobacterium Smegmatis Porin A), which show great promise given their ability to distinguish between individual and groups of nucleotides. Whereas, solid-state nanopore sequencing utilizes synthetic materials such as silicon nitride and aluminum oxide and it is preferred for its superior mechanical ability and thermal and chemical stability. The fabrication method is essential for this type of sequencing given that the nanopore array can contain hundreds of pores with diameters smaller than eight nanometers.
The concept originated from the idea that single stranded DNA or RNA molecules can be electrophoretically driven in a strict linear sequence through a biological pore that can be less than eight nanometers, and can be detected given that the molecules release an ionic current while moving through the pore. The pore contains a detection region capable of recognizing different bases, with each base generating various time specific signals corresponding to the sequence of bases as they cross the pore which are then evaluated. When implementing this process it is important to note that precise control over the DNA transport through the pore is crucial for success. Various enzymes such as exonucleases and polymerases have been used to moderate this process by positioning them near the pore’s entrance.
Oxford Nanopore Technologies, a United Kingdom-based startup company, is currently developing products using nanopore sequencing. These products include the MinION, a handheld sequencer capable of generating more than 150 megabases of sequencing data in one run. The MinION is not yet available to the public and has been found to produce numerous errors, though further study may alleviate the issue.
Tunnelling currents DNA sequencing
Another approach uses measurements of the electrical tunnelling currents across single-strand DNA as it moves through a channel. Depending on its electronic structure each base affects the tunnelling current differently, allowing differentiation between different bases.
The use of tunnelling currents has the potential to sequence orders of magnitude faster than ionic current methods and the sequencing of several DNA oligomers and micro-RNA has already been achieved.
Sequencing by hybridization
Sequencing by hybridization is a non-enzymatic method that uses a DNA microarray. A single pool of DNA whose sequence is to be determined is fluorescently labeled and hybridized to an array containing known sequences. Strong hybridization signals from a given spot on the array identifies its sequence in the DNA being sequenced.
This method of sequencing utilizes binding characteristics of a library of short single stranded DNA molecules (oligonucleotides) also called DNA probes to reconstruct a target DNA sequence. Non-specific hybrids are removed by washing and the target DNA is eluted. Hybrids are re-arranged such that the DNA sequence can be reconstructed. The benefit of this sequencing type is its ability to capture a large number of targets with a homogenous coverage. Although a large number of chemicals and starting DNA is usually required. But, with the advent of solution-based hybridization much less equipment and chemicals are necessary.
Sequencing with mass spectrometry
Mass spectrometry may be used to determine DNA sequences. Matrix-assisted laser desorption ionization time-of-flight mass spectrometry, or MALDI-TOF MS, has specifically been investigated as an alternative method to gel electrophoresis for visualizing DNA fragments. With this method, DNA fragments generated by chain-termination sequencing reactions are compared by mass rather than by size. The mass of each nucleotide is different from the others and this difference is detectable by mass spectrometry. Single-nucleotide mutations in a fragment can be more easily detected with MS than by gel electrophoresis alone. MALDI-TOF MS can more easily detect differences between RNA fragments, so researchers may indirectly sequence DNA with MS-based methods by converting it to RNA first.
The higher resolution of DNA fragments permitted by MS-based methods is of special interest to researchers in forensic science, as they may wish to find single-nucleotide polymorphisms in human DNA samples to identify individuals. These samples may be highly degraded so forensic researchers often prefer mitochondrial DNA for its higher stability and applications for lineage studies. MS-based sequencing methods have been used to compare the sequences of human mitochondrial DNA from samples in a Federal Bureau of Investigation database and from bones found in mass graves of World War I soldiers.
Early chain-termination and TOF MS methods demonstrated read lengths of up to 100 base pairs. Researchers have been unable to exceed this average read size; like chain-termination sequencing alone, MS-based DNA sequencing may not be suitable for large de novo sequencing projects. Even so, a recent study did use the short sequence reads and mass spectroscopy to compare single-nucleotide polymorphisms in pathogenic Streptococcus strains.
Microfluidic Sanger sequencing
In microfluidic Sanger sequencing the entire thermocycling amplification of DNA fragments as well as their separation by electrophoresis is done on a single glass wafer (approximately 10 cm in diameter) thus reducing the reagent usage as well as cost. In some instances researchers have shown that they can increase the throughput of conventional sequencing through the use of microchips. Research will still need to be done in order to make this use of technology effective.
This approach directly visualizes the sequence of DNA molecules using electron microscopy. The first identification of DNA base pairs within intact DNA molecules by enzymatically incorporating modified bases, which contain atoms of increased atomic number, direct visualization and identification of individually labeled bases within a synthetic 3,272 base-pair DNA molecule and a 7,249 base-pair viral genome has been demonstrated.
This method is based on use of RNA polymerase (RNAP), which is attached to a polystyrene bead. One end of DNA to be sequenced is attached to another bead, with both beads being placed in optical traps. RNAP motion during transcription brings the beads in closer and their relative distance changes, which can then be recorded at a single nucleotide resolution. The sequence is deduced based on the four readouts with lowered concentrations of each of the four nucleotide types, similarly to the Sanger method. A comparison is made between regions and sequence information is deduced by comparing the known sequence regions to the unknown sequence regions.
In vitro virus high-throughput sequencing
A method has been developed to analyze full sets of protein interactions using a combination of 454 pyrosequencing and an in vitro virus mRNA display method. Specifically, this method covalently links proteins of interest to the mRNAs encoding them, then detects the mRNA pieces using reverse transcription PCRs. The mRNA may then be amplified and sequenced. The combined method was titled IVV-HiTSeq and can be performed under cell-free conditions, though its results may not be representative of in vivo conditions.
Successful DNA sequencing depends upon sample preparation. In any particular sample used for DNA sequencing, the percent by mass that is DNA may be well under 1%. Furthermore, most in vivo DNA molecules are millions of base pairs long, while existing sequencing technology typically can handle DNA that is no more than one kilobase (or, perhaps, tens of kilobases for some methods). Thus there is a significant amount of work that is needed to purify the DNA, chop it into small pieces, make the pieces sequence ready, and determine the sequence. Researchers use bioinformatics to reassemble the short pieces into a biologically relevant sequence.
In October 2006, the X Prize Foundation established an initiative to promote the development of full genome sequencing technologies, called the Archon X Prize, intending to award $10 million to "the first Team that can build a device and use it to sequence 100 human genomes within 10 days or less, with an accuracy of no more than one error in every 100,000 bases sequenced, with sequences accurately covering at least 98% of the genome, and at a recurring cost of no more than $10,000 (US) per genome."
Each year the National Human Genome Research Institute, or NHGRI, promotes grants for new research and developments in genomics. 2010 grants and 2011 candidates include continuing work in microfluidic, polony and base-heavy sequencing methodologies.
The sequencing technologies described here produce raw data that needs to be assembled into longer sequences such as complete genomes (sequence assembly). There are many computational challenges to achieve this, such as the evaluation of the raw sequence data which is done by programs and algorithms such as Phred and Phrap. Other challenges have to deal with repetitive sequences that often prevent complete genome assemblies because they occur in many places of the genome. As a consequence, many sequences may not be assigned to particular chromosomes. The production of raw sequence data is only the beginning of its detailed bioinformatical analysis. Yet new methods for sequencing and correcting sequencing errors were developed.
Sometimes, the raw reads produced by the sequencer are correct and precise only in a fraction of their length. Using the entire read may introduce artifacts in the downstream analyses like genome assembly, snp calling, or gene expression estimation. Two classes of trimming programs have been introduced, based on the window-based or the running-sum classes of algorithms. This is a partial list of the trimming algorithms currently available, specifying the algorithm class they belong to:
|Name of algorithm||Type of algorithm||Link|
|FASTX quality trimmer||Window based||FASTX quality trimmer|
|This section requires expansion. (May 2015)|
Human genetics have been included within the field of bioethics since the early 1970s and the growth in the use of DNA sequencing (particularly high-throughput sequencing) has introduced a number of ethical issues. One key issue is the ownership of an individual's DNA and the data produced when that DNA is sequenced. Regarding the DNA molecule itself, the leading legal case on this topic, Moore v. Regents of the University of California (1990) ruled that individuals have no property rights to discarded cells or any profits made using these cells (for instance, as a patented cell line). However, individuals have a right to informed consent regarding removal and use of cells. Regarding the data produced through DNA sequencing, Moore gives the individual no rights to the information derived from their DNA.
As DNA sequencing becomes more widespread, the storage, security and sharing of genomic data has also become more important. For instance, one concern is that insurers may use an individual's genomic data to modify their quote, depending on the perceived future health of the individual based on their DNA. In May 2008, the Genetic Information Nondiscrimination Act (GINA) was signed in the United States, prohibiting discrimination on the basis of genetic information with respect to health insurance and employment. In 2012, the US Presidential Commission for the Study of Bioethical Issues reported that existing privacy legislation for DNA sequencing data such as GINA and the Health Insurance Portability and Accountability Act were insufficient, noting that whole-genome sequencing data was particularly sensitive, as it could be used to identify not only the individual from which the data was created, but also their relatives.
Ethical issues have also been raised by the increasing use of genetic variation screening, both in newborns, and in adults by companies such as 23andMe. It has been asserted that screening for genetic variations can be harmful, increasing anxiety in individuals who have been found to have an increased risk of disease. For example, in one case noted in Time, doctors screening an ill baby for genetic variants chose not to inform the parents of an unrelated variant linked to dementia due to the harm it would cause to the parents. However, a 2011 study in The New England Journal of Medicine has shown that individuals undergoing disease risk profiling did not show increased levels of anxiety.
- Olsvik O, Wahlberg J, Petterson B, Uhlén M, Popovic T, Wachsmuth IK, Fields PI (January 1993). "Use of automated sequencing of polymerase chain reaction-generated amplicons to identify three types of cholera toxin subunit B in Vibrio cholerae O1 strains". J. Clin. Microbiol. 31 (1): 22–25. PMC 262614. PMID 7678018.
- Pettersson E, Lundeberg J, Ahmadian A (February 2009). "Generations of sequencing technologies". Genomics 93 (2): 105–11. doi:10.1016/j.ygeno.2008.10.003. PMID 18992322.
- Moréra, Solange; Larivière, Laurent; Kurzeck, Jürgen; Aschke-Sonnenborn, Ursula; Freemont, Paul S; Janin, Joël; Rüger, Wolfgang (August 2001). "High resolution crystal structures of T4 phage β-glucosyltransferase: induced fit and effect of substrate and metal binding". Journal of Molecular Biology 311 (3): 569–577. doi:10.1006/jmbi.2001.4905. PMID 11493010.
- Ehrlich, Melanie; Gama-Sosa, Miguel A.; Huang, Lan-Hsiang; Midgett, Rose Marie; Kuo, Kenneth C.; McCune, Roy A.; Gehrke, Charles (1982). "Amount and distribution of 5-methylcytosine in human DNA from different types of tissues or cells". Nucleic Acids Research 10 (8): 2709–2721. doi:10.1093/nar/10.8.2709. PMC 320645. PMID 7079182.
- Ehrlich, M; Wang, R. (19 June 1981). "5-Methylcytosine in eukaryotic DNA". Science 212 (4501): 1350–1357. doi:10.1126/science.6262918.
- Song, Chun-Xiao; Clark, Tyson A; Lu, Xing-Yu; Kislyuk, Andrey; Dai, Qing; Turner, Stephen W; He, Chuan; Korlach, Jonas (20 November 2011). "Sensitive and specific single-molecule sequencing of 5-hydroxymethylcytosine". Nature Methods 9 (1): 75–77. doi:10.1038/nmeth.1779.
- Watson JD, Crick FH (1953). "The structure of DNA". Cold Spring Harb. Symp. Quant. Biol. 18: 123–31. doi:10.1101/SQB.1953.018.01.020. PMID 13168976.
- Marks, L, The path to DNA sequencing: The life and work of Fred Sanger.
- Min Jou W, Haegeman G, Ysebaert M, Fiers W (May 1972). "Nucleotide sequence of the gene coding for the bacteriophage MS2 coat protein". Nature 237 (5350): 82–8. Bibcode:1972Natur.237...82J. doi:10.1038/237082a0. PMID 4555447.
- Fiers W, Contreras R, Duerinck F, Haegeman G, Iserentant D, Merregaert J, Min Jou W, Molemans F, Raeymaekers A, Van den Berghe A, Volckaert G, Ysebaert M (April 1976). "Complete nucleotide sequence of bacteriophage MS2 RNA: primary and secondary structure of the replicase gene". Nature 260 (5551): 500–7. Bibcode:1976Natur.260..500F. doi:10.1038/260500a0. PMID 1264203.
- "Ray Wu Faculty Profile". Cornell University. Archived from the original on 2009-03-04.
- PADMANABHAN, R; Ray Wu; Ernest Jay (June 1974). "Chemical Synthesis of a Primer and Its Use in the Sequence Analysis of the Lysozyme Gene of Bacteriophage T4". Proceedings of the National Academy of Sciences 71 (6): 2510–2514. Bibcode:1974PNAS...71.2510P. doi:10.1073/pnas.71.6.2510.
- Onaga LA (June 2014). "Ray Wu as Fifth Business: Demonstrating Collective Memory in the History of DNA Sequencing". Studies in the History and Philosophy of Science. Part C 46: 1–14. doi:10.1016/j.shpsc.2013.12.006. PMID 24565976.
- Wu R (1972). "Nucleotide sequence analysis of DNA". Nature New Biol. 236 (68): 198–200. doi:10.1038/newbio236198a0. PMID 4553110.
- Padmanabhan R, Wu R (1972). "Nucleotide sequence analysis of DNA. IX. Use of oligonucleotides of defined sequence as primers in DNA sequence analysis". Biochem. Biophys. Res. Commun. 48 (5): 1295–302. doi:10.1016/0006-291X(72)90852-2. PMID 4560009.
- Wu R, Tu CD, Padmanabhan R (1973). "Nucleotide sequence analysis of DNA. XII. The chemical synthesis and sequence analysis of a dodecadeoxynucleotide which binds to the endolysin gene of bacteriophage lambda". Biochem. Biophys. Res. Commun. 55 (4): 1092–9. doi:10.1016/S0006-291X(73)80007-5. PMID 4358929.
- Jay E, Bambara R, Padmanabhan R, Wu R (March 1974). "DNA sequence analysis: a general, simple and rapid method for sequencing large oligodeoxyribonucleotide fragments by mapping". Nucleic Acids Research 1 (3): 331–353. doi:10.1093/nar/1.3.331. PMC 344020. PMID 10793670.
- Sanger F, Nicklen S, Coulson AR (December 1977). "DNA sequencing with chain-terminating inhibitors". Proc. Natl. Acad. Sci. U.S.A. 74 (12): 5463–7. Bibcode:1977PNAS...74.5463S. doi:10.1073/pnas.74.12.5463. PMC 431765. PMID 271968.
- Maxam AM, Gilbert W (February 1977). "A new method for sequencing DNA". Proc. Natl. Acad. Sci. U.S.A. 74 (2): 560–4. Bibcode:1977PNAS...74..560M. doi:10.1073/pnas.74.2.560. PMC 392330. PMID 265521.
- Gilbert, W. DNA sequencing and gene structure. Nobel lecture, 8 December 1980.
- Gilbert W, Maxam A (December 1973). "The Nucleotide Sequence of the lac Operator". Proc. Natl. Acad. Sci. U.S.A. 70 (12): 3581–4. Bibcode:1973PNAS...70.3581G. doi:10.1073/pnas.70.12.3581. PMC 427284. PMID 4587255.
- Sanger F, Air GM, Barrell BG, Brown NL, Coulson AR, Fiddes CA, Hutchison CA, Slocombe PM, Smith M (February 1977). "Nucleotide sequence of bacteriophage phi X174 DNA". Nature 265 (5596): 687–95. Bibcode:1977Natur.265..687S. doi:10.1038/265687a0. PMID 870828.
- The path to DNA seqencing: The life and work of Fred Sanger.
- Beck S, Pohl FM (1984). "DNA sequencing with direct blotting electrophoresis". EMBO J 3 (12): 2905–2909. PMC 557787. PMID 6396083.
- United States Patent 4,631,122 (1986)
- Feldmann H, Aigle M, Aljinovic G, André B, Baclet MC, Barthe C, Baur A, Bécam AM, Biteau N, Boles E, Brandt T, Brendel M, Brückner M, Bussereau F, Christiansen C, Contreras R, Crouzet M, Cziepluch C, Démolis N, Delaveau T, Doignon F, Domdey H, Düsterhus S, Dubois E, Dujon B, El Bakkoury M, Entian KD, Feurmann M, Fiers W, Fobo GM, Fritz C, Gassenhuber H, Glandsdorff N, Goffeau A, Grivell LA, de Haan M, Hein C, Herbert CJ, Hollenberg CP, Holmstrøm K, Jacq C, Jacquet M, Jauniaux JC, Jonniaux JL, Kallesøe T, Kiesau P, Kirchrath L, Kötter P, Korol S, Liebl S, Logghe M, Lohan AJ, Louis EJ, Li ZY, Maat MJ, Mallet L, Mannhaupt G, Messenguy F, Miosga T, Molemans F, Müller S, Nasr F, Obermaier B, Perea J, Piérard A, Piravandi E, Pohl FM, Pohl TM, Potier S, Proft M, Purnelle B, Ramezani Rad M, Rieger M, Rose M, Schaaff-Gerstenschläger I, Scherens B, Schwarzlose C, Skala J, Slonimski PP, Smits PH, Souciet JL, Steensma HY, Stucka R, Urrestarazu A, van der Aart QJ, van Dyck L, Vassarotti A, Vetter I, Vierendeels F, Vissers S, Wagner G, de Wergifosse P, Wolfe KH, Zagulski M, Zimmermann FK, Mewes HW, Kleine K (1994). "Complete DNA sequence of yeast chromosome II". EMBO J. 13 (24): 5795–809. PMC 395553. PMID 7813418.
- Smith LM, Sanders JZ, Kaiser RJ, Hughes P, Dodd C, Connell CR, Heiner C, Kent SB, Hood LE (12 June 1986). "Fluorescence Detection in Automated DNA Sequence Analysis". Nature 321 (6071): 674–79. Bibcode:1986Natur.321..674S. doi:10.1038/321674a0. PMID 3713851.
- Prober JM, Trainor GL, Dam RJ, Hobbs FW, Robertson CW, Zagursky RJ, Cocuzza AJ, Jensen MA, Baumeister K (16 Oct 1987). "A system for rapid DNA sequencing with fluorescent chain-terminating dideoxynucleotides". Science 238 (4825): 336–41. Bibcode:1987Sci...238..336P. doi:10.1126/science.2443975. PMID 2443975.
- Adams MD, Kelley JM, Gocayne JD, Dubnick M, Polymeropoulos MH, Xiao H, Merril CR, Wu A, Olde B, Moreno RF (June 1991). "Complementary DNA sequencing: expressed sequence tags and human genome project". Science 252 (5013): 1651–6. Bibcode:1991Sci...252.1651A. doi:10.1126/science.2047873. PMID 2047873.
- Fleischmann RD, Adams MD, White O, Clayton RA, Kirkness EF, Kerlavage AR, Bult CJ, Tomb JF, Dougherty BA, Merrick JM (July 1995). "Whole-genome random sequencing and assembly of Haemophilus influenzae Rd". Science 269 (5223): 496–512. Bibcode:1995Sci...269..496F. doi:10.1126/science.7542800. PMID 7542800.
- Lander ES, Linton LM, Birren B, Nusbaum C, Zody MC, Baldwin J, Devon K, Dewar K, Doyle M, FitzHugh W, Funke R, Gage D, Harris K, Heaford A, Howland J, Kann L, Lehoczky J, LeVine R, McEwan P, McKernan K, Meldrim J, Mesirov JP, Miranda C, Morris W, Naylor J, Raymond C, Rosetti M, Santos R, Sheridan A, Sougnez C, Stange-Thomann N, Stojanovic N, Subramanian A, Wyman D, Rogers J, Sulston J, Ainscough R, Beck S, Bentley D, Burton J, Clee C, Carter N, Coulson A, Deadman R, Deloukas P, Dunham A, Dunham I, Durbin R, French L, Grafham D, Gregory S, Hubbard T, Humphray S, Hunt A, Jones M, Lloyd C, McMurray A, Matthews L, Mercer S, Milne S, Mullikin JC, Mungall A, Plumb R, Ross M, Shownkeen R, Sims S, Waterston RH, Wilson RK, Hillier LW, McPherson JD, Marra MA, Mardis ER, Fulton LA, Chinwalla AT, Pepin KH, Gish WR, Chissoe SL, Wendl MC, Delehaunty KD, Miner TL, Delehaunty A, Kramer JB, Cook LL, Fulton RS, Johnson DL, Minx PJ, Clifton SW, Hawkins T, Branscomb E, Predki P, Richardson P, Wenning S, Slezak T, Doggett N, Cheng JF, Olsen A, Lucas S, Elkin C, Uberbacher E, Frazier M, Gibbs RA, Muzny DM, Scherer SE, Bouck JB, Sodergren EJ, Worley KC, Rives CM, Gorrell JH, Metzker ML, Naylor SL, Kucherlapati RS, Nelson DL, Weinstock GM, Sakaki Y, Fujiyama A, Hattori M, Yada T, Toyoda A, Itoh T, Kawagoe C, Watanabe H, Totoki Y, Taylor T, Weissenbach J, Heilig R, Saurin W, Artiguenave F, Brottier P, Bruls T, Pelletier E, Robert C, Wincker P, Smith DR, Doucette-Stamm L, Rubenfield M, Weinstock K, Lee HM, Dubois J, Rosenthal A, Platzer M, Nyakatura G, Taudien S, Rump A, Yang H, Yu J, Wang J, Huang G, Gu J, Hood L, Rowen L, Madan A, Qin S, Davis RW, Federspiel NA, Abola AP, Proctor MJ, Myers RM, Schmutz J, Dickson M, Grimwood J, Cox DR, Olson MV, Kaul R, Raymond C, Shimizu N, Kawasaki K, Minoshima S, Evans GA, Athanasiou M, Schultz R, Roe BA, Chen F, Pan H, Ramser J, Lehrach H, Reinhardt R, McCombie WR, de la Bastide M, Dedhia N, Blöcker H, Hornischer K, Nordsiek G, Agarwala R, Aravind L, Bailey JA, Bateman A, Batzoglou S, Birney E, Bork P, Brown DG, Burge CB, Cerutti L, Chen HC, Church D, Clamp M, Copley RR, Doerks T, Eddy SR, Eichler EE, Furey TS, Galagan J, Gilbert JG, Harmon C, Hayashizaki Y, Haussler D, Hermjakob H, Hokamp K, Jang W, Johnson LS, Jones TA, Kasif S, Kaspryzk A, Kennedy S, Kent WJ, Kitts P, Koonin EV, Korf I, Kulp D, Lancet D, Lowe TM, McLysaght A, Mikkelsen T, Moran JV, Mulder N, Pollara VJ, Ponting CP, Schuler G, Schultz J, Slater G, Smit AF, Stupka E, Szustakowski J, Thierry-Mieg D, Thierry-Mieg J, Wagner L, Wallis J, Wheeler R, Williams A, Wolf YI, Wolfe KH, Yang SP, Yeh RF, Collins F, Guyer MS, Peterson J, Felsenfeld A, Wetterstrand KA, Patrinos A, Morgan MJ, de Jong P, Catanese JJ, Osoegawa K, Shizuya H, Choi S, Chen YJ, Szustakowki J (February 2001). "Initial sequencing and analysis of the human genome". Nature 409 (6822): 860–921. Bibcode:2001Natur.409..860L. doi:10.1038/35057062. PMID 11237011.
- Venter JC, Adams MD, Myers EW, Li PW, Mural RJ, Sutton GG, Smith HO, Yandell M, Evans CA, Holt RA, Gocayne JD, Amanatides P, Ballew RM, Huson DH, Wortman JR, Zhang Q, Kodira CD, Zheng XH, Chen L, Skupski M, Subramanian G, Thomas PD, Zhang J, Gabor Miklos GL, Nelson C, Broder S, Clark AG, Nadeau J, McKusick VA, Zinder N, Levine AJ, Roberts RJ, Simon M, Slayman C, Hunkapiller M, Bolanos R, Delcher A, Dew I, Fasulo D, Flanigan M, Florea L, Halpern A, Hannenhalli S, Kravitz S, Levy S, Mobarry C, Reinert K, Remington K, Abu-Threideh J, Beasley E, Biddick K, Bonazzi V, Brandon R, Cargill M, Chandramouliswaran I, Charlab R, Chaturvedi K, Deng Z, Di Francesco V, Dunn P, Eilbeck K, Evangelista C, Gabrielian AE, Gan W, Ge W, Gong F, Gu Z, Guan P, Heiman TJ, Higgins ME, Ji RR, Ke Z, Ketchum KA, Lai Z, Lei Y, Li Z, Li J, Liang Y, Lin X, Lu F, Merkulov GV, Milshina N, Moore HM, Naik AK, Narayan VA, Neelam B, Nusskern D, Rusch DB, Salzberg S, Shao W, Shue B, Sun J, Wang Z, Wang A, Wang X, Wang J, Wei M, Wides R, Xiao C, Yan C, Yao A, Ye J, Zhan M, Zhang W, Zhang H, Zhao Q, Zheng L, Zhong F, Zhong W, Zhu S, Zhao S, Gilbert D, Baumhueter S, Spier G, Carter C, Cravchik A, Woodage T, Ali F, An H, Awe A, Baldwin D, Baden H, Barnstead M, Barrow I, Beeson K, Busam D, Carver A, Center A, Cheng ML, Curry L, Danaher S, Davenport L, Desilets R, Dietz S, Dodson K, Doup L, Ferriera S, Garg N, Gluecksmann A, Hart B, Haynes J, Haynes C, Heiner C, Hladun S, Hostin D, Houck J, Howland T, Ibegwam C, Johnson J, Kalush F, Kline L, Koduru S, Love A, Mann F, May D, McCawley S, McIntosh T, McMullen I, Moy M, Moy L, Murphy B, Nelson K, Pfannkoch C, Pratts E, Puri V, Qureshi H, Reardon M, Rodriguez R, Rogers YH, Romblad D, Ruhfel B, Scott R, Sitter C, Smallwood M, Stewart E, Strong R, Suh E, Thomas R, Tint NN, Tse S, Vech C, Wang G, Wetter J, Williams S, Williams M, Windsor S, Winn-Deen E, Wolfe K, Zaveri J, Zaveri K, Abril JF, Guigó R, Campbell MJ, Sjolander KV, Karlak B, Kejariwal A, Mi H, Lazareva B, Hatton T, Narechania A, Diemer K, Muruganujan A, Guo N, Sato S, Bafna V, Istrail S, Lippert R, Schwartz R, Walenz B, Yooseph S, Allen D, Basu A, Baxendale J, Blick L, Caminha M, Carnes-Stine J, Caulk P, Chiang YH, Coyne M, Dahlke C, Mays A, Dombroski M, Donnelly M, Ely D, Esparham S, Fosler C, Gire H, Glanowski S, Glasser K, Glodek A, Gorokhov M, Graham K, Gropman B, Harris M, Heil J, Henderson S, Hoover J, Jennings D, Jordan C, Jordan J, Kasha J, Kagan L, Kraft C, Levitsky A, Lewis M, Liu X, Lopez J, Ma D, Majoros W, McDaniel J, Murphy S, Newman M, Nguyen T, Nguyen N, Nodell M, Pan S, Peck J, Peterson M, Rowe W, Sanders R, Scott J, Simpson M, Smith T, Sprague A, Stockwell T, Turner R, Venter E, Wang M, Wen M, Wu D, Wu M, Xia A, Zandieh A, Zhu X (February 2001). "The sequence of the human genome". Science 291 (5507): 1304–51. Bibcode:2001Sci...291.1304V. doi:10.1126/science.1058040. PMID 11181995.
- Tsien base-by-base sequencing patent
- Ronaghi M, Karamohamed S, Pettersson B, Uhlén M, Nyrén P (1996). "Real-time DNA sequencing using detection of pyrophosphate release". Analytical Biochemistry 242 (1): 84–9. doi:10.1006/abio.1996.0432. PMID 8923969.
- Kawashima, Eric H.; Laurent Farinelli; Pascal Mayer (2005-05-12). "Patent: Method of nucleic acid amplification". Retrieved 2012-12-22.
- Brenner S, Johnson M, Bridgham J, Golda G, Lloyd DH, Johnson D, Luo S, McCurdy S, Foy M, Ewan M, Roth R, George D, Eletr S, Albrecht G, Vermaas E, Williams SR, Moon K, Burcham T, Pallas M, DuBridge RB, Kirchner J, Fearon K, Mao J, Corcoran K (2000). "Gene expression analysis by massively parallel signature sequencing (MPSS) on microbead arrays". Nature Biotechnology (Nature Biotechnology) 18 (6): 630–634. doi:10.1038/76469. PMID 10835600.
- Stein RA (1 September 2008). "Next-Generation Sequencing Update". Genetic Engineering & Biotechnology News 28 (15).
- Schuster SC (January 2008). "Next-generation sequencing transforms today's biology". Nat. Methods 5 (1): 16–8. doi:10.1038/nmeth1156. PMID 18165802.
- Ewing B, Green P (March 1998). "Base-calling of automated sequencer traces using phred. II. Error probabilities". Genome Res. 8 (3): 186–94. doi:10.1101/gr.8.3.186 (inactive 2015-01-01). PMID 9521922.
- Sanger F, Coulson AR (May 1975). "A rapid method for determining sequences in DNA by primed synthesis with DNA polymerase". J. Mol. Biol. 94 (3): 441–8. doi:10.1016/0022-2836(75)90213-2. PMID 1100841.
- Wetterstrand, Kris. "DNA Sequencing Costs: Data from the NHGRI Genome Sequencing Program (GSP)". National Human Genome Research Institute. Retrieved 30 May 2013.
- Quail MA, Gu Y, Swerdlow H, Mayho M (2012). "Evaluation and optimisation of preparative semi-automated electrophoresis systems for Illumina library preparation". Electrophoresis 33 (23): 3521–8. doi:10.1002/elps.201200128. PMID 23147856.
- Duhaime MB, Deng L, Poulos BT, Sullivan MB (2012). "Towards quantitative metagenomics of wild viruses and other ultra-low concentration DNA samples: a rigorous assessment and optimization of the linker amplification method". Environ. Microbiol. 14 (9): 2526–37. doi:10.1111/j.1462-2920.2012.02791.x. PMC 3466414. PMID 22713159.
- Peterson BK, Weber JN, Kay EH, Fisher HS, Hoekstra HE (2012). "Double digest RADseq: an inexpensive method for de novo SNP discovery and genotyping in model and non-model species". PLoS ONE 7 (5): e37135. doi:10.1371/journal.pone.0037135. PMC 3365034. PMID 22675423.
- Williams R, Peisajovich SG, Miller OJ, Magdassi S, Tawfik DS, Griffiths AD (2006). "Amplification of complex gene libraries by emulsion PCR". Nature methods 3 (7): 545–550. doi:10.1038/nmeth896. PMID 16791213.
- Margulies M, Egholm M, Altman WE, Attiya S, Bader JS, Bemben LA, Berka J, Braverman MS, Chen YJ, Chen Z, Dewell SB, Du L, Fierro JM, Gomes XV, Godwin BC, He W, Helgesen S, Ho CH, Ho CH, Irzyk GP, Jando SC, Alenquer ML, Jarvie TP, Jirage KB, Kim JB, Knight JR, Lanza JR, Leamon JH, Lefkowitz SM, Lei M, Li J, Lohman KL, Lu H, Makhijani VB, McDade KE, McKenna MP, Myers EW, Nickerson E, Nobile JR, Plant R, Puc BP, Ronan MT, Roth GT, Sarkis GJ, Simons JF, Simpson JW, Srinivasan M, Tartaro KR, Tomasz A, Vogt KA, Volkmer GA, Wang SH, Wang Y, Weiner MP, Yu P, Begley RF, Rothberg JM (September 2005). "Genome Sequencing in Open Microfabricated High Density Picoliter Reactors". Nature 437 (7057): 376–80. Bibcode:2005Natur.437..376M. doi:10.1038/nature03959. PMC 1464427. PMID 16056220.
- Shendure J, Porreca GJ, Reppas NB, Lin X, McCutcheon JP, Rosenbaum AM, Wang MD, Zhang K, Mitra RD, Church GM (2005). "Accurate Multiplex Polony Sequencing of an Evolved Bacterial Genome". Science 309 (5741): 1728–32. Bibcode:2005Sci...309.1728S. doi:10.1126/science.1117389. PMID 16081699.
- Applied Biosystems' SOLiD technology
- Staden R (11 Jun 1979). "A strategy of DNA sequencing employing computer programs.". Nucleic Acids Research 6 (7): 2601–10. doi:10.1093/nar/6.7.2601. PMC 327874. PMID 461197.
- P. Mayer,L. Farinelli, G. Matton, C. Adessi, G. Turcatti, J. J. Mermod, E. Kawashima.DNA colony massively parallel sequencing ams98 presentation
- U.S. Patent 5,641,658
- Braslavsky I, Hebert B, Kartalov E, Quake SR (April 2003). "Sequence information can be obtained from single DNA molecules". Proc. Natl. Acad. Sci. U.S.A. 100 (7): 3960–4. Bibcode:2003PNAS..100.3960B. doi:10.1073/pnas.0230489100. PMC 153030. PMID 12651960.
- de Magalhães JP, Finch CE, Janssens G (2010). "Next-generation sequencing in aging research: emerging applications, problems, pitfalls and possible solutions". Ageing Research Reviews 9 (3): 315–323. doi:10.1016/j.arr.2009.10.006. PMC 2878865. PMID 19900591.
- Hall N (May 2007). "Advanced sequencing technologies and their wider impact in microbiology". J. Exp. Biol. 209 (Pt 9): 1518–1525. doi:10.1242/jeb.001370. PMID 17449817.
- Church GM (January 2006). "Genomes for all". Sci. Am. 294 (1): 46–54. doi:10.1038/scientificamerican0106-46. PMID 16468433.(subscription required)
- Kalb, Gilbert; Moxley, Robert (1992). Massively Parallel, Optical, and Neural Computing in the United States. IOS Press. ISBN 90-5199-097-9.[page needed]
- ten Bosch JR, Grody WW (2008). "Keeping Up with the Next Generation". The Journal of Molecular Diagnostics 10 (6): 484–492. doi:10.2353/jmoldx.2008.080027. PMC 2570630. PMID 18832462.
- Tucker T, Marra M, Friedman JM (2009). "Massively Parallel Sequencing: The Next Big Thing in Genetic Medicine". The American Journal of Human Genetics 85 (2): 142–154. doi:10.1016/j.ajhg.2009.06.022. PMC 2725244. PMID 19679224.
- Quail MA, Smith M, Coupland P, Otto TD, Harris SR, Connor TR, Bertoni A, Swerdlow HP, Gu Y (1 January 2012). "A tale of three next generation sequencing platforms: comparison of Ion Torrent, Pacific Biosciences and illumina MiSeq sequencers". BMC Genomics 13 (1): 341. doi:10.1186/1471-2164-13-341. PMC 3431227. PMID 22827831.
- Liu L, Li Y, Li S, Hu N, He Y, Pong R, Lin D, Lu L, Law M (1 January 2012). "Comparison of Next-Generation Sequencing Systems". Journal of Biomedicine and Biotechnology (Hindawi Publishing Corporation) 2012: 1–11. doi:10.1155/2012/251364. PMID 22829749.
- New Products: PacBio's RS II; Cufflinks | In Sequence | Sequencing | GenomeWeb
- "After a Year of Testing, Two Early PacBio Customers Expect More Routine Use of RS Sequencer in 2012". GenomeWeb. 10 January 2012.(registration required)
- Pacific Biosciences Introduces New Chemistry With Longer Read Lengths
- Chin CS, Alexander DH, Marks P, Klammer AA, Drake J, Heiner C, Clum A, Copeland A, Huddleston J, Eichler EE, Turner SW, Korlach J (2013). "Nonhybrid, finished microbial genome assemblies from long-read SMRT sequencing data". Nat. Methods 10 (6): 563–9. doi:10.1038/nmeth.2474. PMID 23644548.
- De novo bacterial genome assembly: a solved problem? | In between lines of code
- Rasko DA, Webster DR, Sahl JW, Bashir A, Boisen N, Scheutz F, Paxinos EE, Sebra R, Chin CS, Iliopoulos D, Klammer A, Peluso P, Lee L, Kislyuk AO, Bullard J, Kasarskis A, Wang S, Eid J, Rank D, Redman JC, Steyert SR, Frimodt-Møller J, Struve C, Petersen AM, Krogfelt KA, Nataro JP, Schadt EE, Waldor MK (25 August 2011). "Origins of the Strain Causing an Outbreak of Hemolytic–Uremic Syndrome in Germany". N Engl J Med 365 (8): 709–717. doi:10.1056/NEJMoa1106920. PMID 21793740.
- Tran B, Brown AM, Bedard PL, Winquist E, Goss GD, Hotte SJ, Welch SA, Hirte HW, Zhang T, Stein LD, Ferretti V, Watt S, Jiao W, Ng K, Ghai S, Shaw P, Petrocelli T, Hudson TJ, Neel BG, Onetto N, Siu LL, McPherson JD, Kamel-Reid S, Dancey JE (1 January 2012). "Feasibility of real time next generation sequencing of cancer genes linked to drug response: Results from a clinical trial". Int. J. Cancer 132 (7): 1547–1555. doi:10.1002/ijc.27817. PMID 22948899.(subscription required)
- Murray IA, Clark TA, Morgan RD, Boitano M, Anton BP, Luong K, Fomenkov A, Turner SW, Korlach J, Roberts RJ (2 October 2012). "The methylomes of six bacteria". Nucleic Acids Research 40 (22): 11450–62. doi:10.1093/nar/gks891. PMC 3526280. PMID 23034806.
- van Vliet AH (1 January 2010). "Next generation sequencing of microbial transcriptomes: challenges and opportunities". FEMS Microbiology Letters 302 (1): 1–7. doi:10.1111/j.1574-6968.2009.01767.x. PMID 19735299.
- Huang YF, Chen SC, Chiang YS, Chen TH, Chiu KP (2012). "Palindromic sequence impedes sequencing-by-ligation mechanism". BMC Systems Biology. 6 Suppl 2: S10. doi:10.1186/1752-0509-6-S2-S10. PMID 23281822.
- Shendure J, Porreca GJ, Reppas NB, Lin X, McCutcheon JP, Rosenbaum AM, Wang MD, Zhang K, Mitra RD, Church GM (9 Sep 2005). "Accurate multiplex polony sequencing of an evolved bacterial genome.". Science 309 (5741): 1728–32. Bibcode:2005Sci...309.1728S. doi:10.1126/science.1117389. PMID 16081699.
- Bentley DR, Balasubramanian S, Swerdlow HP, Smith GP, Milton J, Brown CG, Hall KP, Evers DJ, Barnes CL, Bignell HR, Boutell JM, Bryant J, Carter RJ, Keira Cheetham R, Cox AJ, Ellis DJ, Flatbush MR, Gormley NA, Humphray SJ, Irving LJ, Karbelashvili MS, Kirk SM, Li H, Liu X, Maisinger KS, Murray LJ, Obradovic B, Ost T, Parkinson ML, Pratt MR, Rasolonjatovo IM, Reed MT, Rigatti R, Rodighiero C, Ross MT, Sabot A, Sankar SV, Scally A, Schroth GP, Smith ME, Smith VP, Spiridou A, Torrance PE, Tzonev SS, Vermaas EH, Walter K, Wu X, Zhang L, Alam MD, Anastasi C, Aniebo IC, Bailey DM, Bancarz IR, Banerjee S, Barbour SG, Baybayan PA, Benoit VA, Benson KF, Bevis C, Black PJ, Boodhun A, Brennan JS, Bridgham JA, Brown RC, Brown AA, Buermann DH, Bundu AA, Burrows JC, Carter NP, Castillo N, Chiara E Catenazzi M, Chang S, Neil Cooley R, Crake NR, Dada OO, Diakoumakos KD, Dominguez-Fernandez B, Earnshaw DJ, Egbujor UC, Elmore DW, Etchin SS, Ewan MR, Fedurco M, Fraser LJ, Fuentes Fajardo KV, Scott Furey W, George D, Gietzen KJ, Goddard CP, Golda GS, Granieri PA, Green DE, Gustafson DL, Hansen NF, Harnish K, Haudenschild CD, Heyer NI, Hims MM, Ho JT, Horgan AM, Hoschler K, Hurwitz S, Ivanov DV, Johnson MQ, James T, Huw Jones TA, Kang GD, Kerelska TH, Kersey AD, Khrebtukova I, Kindwall AP, Kingsbury Z, Kokko-Gonzales PI, Kumar A, Laurent MA, Lawley CT, Lee SE, Lee X, Liao AK, Loch JA, Lok M, Luo S, Mammen RM, Martin JW, McCauley PG, McNitt P, Mehta P, Moon KW, Mullens JW, Newington T, Ning Z, Ling Ng B, Novo SM, O'Neill MJ, Osborne MA, Osnowski A, Ostadan O, Paraschos LL, Pickering L, Pike AC, Pike AC, Chris Pinkard D, Pliskin DP, Podhasky J, Quijano VJ, Raczy C, Rae VH, Rawlings SR, Chiva Rodriguez A, Roe PM, Rogers J, Rogert Bacigalupo MC, Romanov N, Romieu A, Roth RK, Rourke NJ, Ruediger ST, Rusman E, Sanches-Kuiper RM, Schenker MR, Seoane JM, Shaw RJ, Shiver MK, Short SW, Sizto NL, Sluis JP, Smith MA, Ernest Sohna Sohna J, Spence EJ, Stevens K, Sutton N, Szajkowski L, Tregidgo CL, Turcatti G, Vandevondele S, Verhovsky Y, Virk SM, Wakelin S, Walcott GC, Wang J, Worsley GJ, Yan J, Yau L, Zuerlein M, Rogers J, Mullikin JC, Hurles ME, McCooke NJ, West JS, Oaks FL, Lundberg PL, Klenerman D, Durbin R, Smith AJ (2008). "Accurate whole human genome sequencing using reversible terminator chemistry". Nature 456 (7218): 53–59. doi:10.1038/nature07517. PMC 2581791. PMID 18987734.
- Mardis ER (2008). "Next-generation DNA sequencing methods". Annu Rev Genomics Hum Genet 9: 387–402. doi:10.1146/annurev.genom.9.081307.164359. PMID 18576944.
- Valouev A, Ichikawa J, Tonthat T, Stuart J, Ranade S, Peckham H, Zeng K, Malek JA, Costa G, McKernan K, Sidow A, Fire A, Johnson SM (July 2008). "A high-resolution, nucleosome position map of C. elegans reveals a lack of universal sequence-dictated positioning". Genome Res. 18 (7): 1051–63. doi:10.1101/gr.076463.108. PMC 2493394. PMID 18477713.
- Rusk N (2011). "Torrents of sequence". Nat Meth 8 (1): 44–44. doi:10.1038/nmeth.f.330.
- Drmanac R, Sparks AB, Callow MJ, Halpern AL, Burns NL, Kermani BG, Carnevali P, Nazarenko I, Nilsen GB, Yeung G, Dahl F, Fernandez A, Staker B, Pant KP, Baccash J, Borcherding AP, Brownley A, Cedeno R, Chen L, Chernikoff D, Cheung A, Chirita R, Curson B, Ebert JC, Hacker CR, Hartlage R, Hauser B, Huang S, Jiang Y, Karpinchyk V, Koenig M, Kong C, Landers T, Le C, Liu J, McBride CE, Morenzoni M, Morey RE, Mutch K, Perazich H, Perry K, Peters BA, Peterson J, Pethiyagoda CL, Pothuraju K, Richter C, Rosenbaum AM, Roy S, Shafto J, Sharanhovich U, Shannon KW, Sheppy CG, Sun M, Thakuria JV, Tran A, Vu D, Zaranek AW, Wu X, Drmanac S, Oliphant AR, Banyai WC, Martin B, Ballinger DG, Church GM, Reid CA (2010). "Human Genome Sequencing Using Unchained Base Reads in Self-Assembling DNA Nanoarrays". Science 327 (5961): 78–81. Bibcode:2010Sci...327...78D. doi:10.1126/science.1181498. PMID 19892942.
- Porreca GJ (2010). "Genome Sequencing on Nanoballs". Nature Biotechnology 28 (1): 43–44. doi:10.1038/nbt0110-43. PMID 20062041.
- Complete Genomics Press release, 2010
- HeliScope Gene Sequencing / Genetic Analyzer System : Helicos BioSciences
- Thompson JF, Steinmann KE (October 2010). "Single molecule sequencing with a HeliScope genetic analysis system.". Current Protocols in Molecular Biology. Chapter 7: Unit7.10. doi:10.1002/0471142727.mb0710s92. PMC 2954431. PMID 20890904.
- "tSMS SeqLL Technical Explanation". SeqLL. Retrieved 9 Aug 2015.
- Sara El-Metwally, Osama M. Ouda, Mohamed Helmy. New Horizons in Next-Generation Sequencing. Next Generation Sequencing Technologies and Challenges in Sequence Assembly, SpringerBriefs in Systems Biology Volume 7, 2014, pp 51-59.
- PacBio Sales Start to Pick Up as Company Delivers on Product Enhancements | In Sequence | Sequencing | GenomeWeb
- "The Harvard Nanopore Group". Mcb.harvard.edu. Retrieved 2009-11-15.
- "Nanopore Sequencing Could Slash DNA Analysis Costs".
- US patent 20060029957, ZS Genetics, "Systems and methods of analyzing nucleic acid polymers and related components", issued 2005-07-14
- Xu M, Fujita D, Hanagata N (December 2009). "Perspectives and challenges of emerging single-molecule DNA sequencing technologies". Small 5 (23): 2638–49. doi:10.1002/smll.200900976. PMID 19904762.
- Schadt EE, Turner S, Kasarskis A (2010). "A window into third-generation sequencing". Human Molecular Genetics 19 (R2): R227–40. doi:10.1093/hmg/ddq416. PMID 20858600.
- Stoddart D, Heron AJ, Mikhailova E, Maglia G, Bayley H (12 May 2009). "Single-nucleotide discrimination in immobilized DNA oligonucleotides with a biological nanopore". Proceedings of the National Academy of Sciences of the United States of America 106 (19): 7702–7. Bibcode:2009PNAS..106.7702S. doi:10.1073/pnas.0901054106. PMC 2683137. PMID 19380741.
- dela Torre R, Larkin J, Singer A, Meller A (2012). "Fabrication and characterization of solid-state nanopore arrays for high-throughput DNA sequencing". Nanotechnology 23 (38): 385308. Bibcode:2012Nanot..23L5308D. doi:10.1088/0957-4484/23/38/385308. PMC 3557807. PMID 22948520.
- Pathak, B., Lofas, H., Prasongkit, J., Grigoriev, A., Ahuja, R., & Scheicher, R. H. (9 January 2012). Double-functionalized nanopore-embedded gold electrodes for rapid DNA sequencing. Applied Physics Letters, 100, 2.)
- Korlach J, Marks PJ, Cicero RL, Gray JJ, Murphy DL, Roitman DB, Pham TT, Otto GA, Foquet M, Turner SW (2008). "Selective aluminum passivation for targeted immobilization of single DNA polymerase molecules in zero-mode waveguide nanostructures". Proceedings of the National Academy of Sciences 105 (4): 1176–1181. Bibcode:2008PNAS..105.1176K. doi:10.1073/pnas.0710982105. PMC 2234111. PMID 18216253.
- Mikheyev, Alexander S.; Tin, Mandy M. Y. (November 2014). "A first look at the Oxford Nanopore MinION sequencer". Molecular Ecology Resources 14 (6): 1097–1102. doi:10.1111/1755-0998.12324.
- Jain, Miten; Fiddes, Ian T; Miga, Karen H; Olsen, Hugh E; Paten, Benedict; Akeson, Mark (16 February 2015). "Improved data analysis for the MinION nanopore sequencer". Nature Methods 12 (4): 351–356. doi:10.1038/nmeth.3290.
- Di Ventra M (2013). "Fast DNA sequencing by electrical means inches closer". Nanotechnology 24 (34): 342501. Bibcode:2013Nanot..24H2501D. doi:10.1088/0957-4484/24/34/342501. PMID 23899780.
- Ohshiro T, Matsubara K, Tsutsui M, Furuhashi M, Taniguchi M, Kawai T (2012). "Single-molecule electrical random resequencing of DNA and RNA". Sci Rep 2: 501. doi:10.1038/srep00501. PMC 3392642. PMID 22787559.
- Hanna GJ, Johnson VA, Kuritzkes DR, Richman DD, Martinez-Picado J, Sutton L, Hazelwood JD, D'Aquila RT (1 July 2000). "Comparison of Sequencing by Hybridization and Cycle Sequencing for Genotyping of Human Immunodeficiency Virus Type 1 Reverse Transcriptase". J. Clin. Microbiol. 38 (7): 2715–21. PMC 87006. PMID 10878069.
- Morey M, Fernández-Marmiesse A, Castiñeiras D, Fraga JM, Couce ML, Cocho JA (2013). "A glimpse into past, present, and future DNA sequencing". Molecular Genetics and Metabolism 110 (1–2): 3–24. doi:10.1016/j.ymgme.2013.04.024. PMID 23742747.
- Qin Y, Schneider TM, Brenner MP (2012). Gibas C, ed. "Sequencing by Hybridization of Long Targets". PLoS ONE 7 (5): e35819. Bibcode:2012PLoSO...735819Q. doi:10.1371/journal.pone.0035819. PMC 3344849. PMID 22574124.
- Edwards JR, Ruparel H, Ju J (2005). "Mass-spectrometry DNA sequencing". Mutation Research 573 (1–2): 3–12. doi:10.1016/j.mrfmmm.2004.07.021. PMID 15829234.
- Hall TA, Budowle B, Jiang Y, Blyn L, Eshoo M, Sannes-Lowery KA, Sampath R, Drader JJ, Hannis JC, Harrell P, Samant V, White N, Ecker DJ, Hofstadler SA (2005). "Base composition analysis of human mitochondrial DNA using electrospray ionization mass spectrometry: A novel tool for the identification and differentiation of humans". Analytical Biochemistry 344 (1): 53–69. doi:10.1016/j.ab.2005.05.028. PMID 16054106.
- Howard R, Encheva V, Thomson J, Bache K, Chan YT, Cowen S, Debenham P, Dixon A, Krause JU, Krishan E, Moore D, Moore V, Ojo M, Rodrigues S, Stokes P, Walker J, Zimmermann W, Barallon R (15 Jun 2011). "Comparative analysis of human mitochondrial DNA from World War I bone samples by DNA sequencing and ESI-TOF mass spectrometry". Forensic Science International: Genetics 7 (1): 1–9. doi:10.1016/j.fsigen.2011.05.009. PMID 21683667.
- Monforte JA, Becker CH (1 March 1997). "High-throughput DNA analysis by time-of-flight mass spectrometry". Nature Medicine 3 (3): 360–362. doi:10.1038/nm0397-360. PMID 9055869.
- Beres SB, Carroll RK, Shea PR, Sitkiewicz I, Martinez-Gutierrez JC, Low DE, McGeer A, Willey BM, Green K, Tyrrell GJ, Goldman TD, Feldgarden M, Birren BW, Fofanov Y, Boos J, Wheaton WD, Honisch C, Musser JM (8 February 2010). "Molecular complexity of successive bacterial epidemics deconvoluted by comparative pathogenomics". Proceedings of the National Academy of Sciences 107 (9): 4371–4376. Bibcode:2010PNAS..107.4371B. doi:10.1073/pnas.0911295107. PMC 2840111. PMID 20142485.
- Kan CW, Fredlake CP, Doherty EA, Barron AE (1 November 2004). "DNA sequencing and genotyping in miniaturized electrophoresis systems". Electrophoresis 25 (21–22): 3564–3588. doi:10.1002/elps.200406161. PMID 15565709.
- Chen YJ, Roller EE, Huang X (2010). "DNA sequencing by denaturation: experimental proof of concept with an integrated fluidic device". Lab on Chip 10 (9): 1153–1159. doi:10.1039/b921417h. PMC 2881221. PMID 20390134.
- Bell DC, Thomas WK, Murtagh KM, Dionne CA, Graham AC, Anderson JE, Glover WR (9 Oct 2012). "DNA Base Identification by Electron Microscopy". Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 18 (5): 1–5. Bibcode:2012MiMic..18.1049B. doi:10.1017/S1431927612012615. PMID 23046798.
- Pareek CS, Smoczynski R, Tretyn A (November 2011). "Sequencing technologies and genome sequencing". Journal of applied genetics 52 (4): 413–35. doi:10.1007/s13353-011-0057-x. PMC 3189340. PMID 21698376.
- Pareek CS, Smoczynski R, Tretyn A (2011). "Sequencing technologies and genome sequencing". Journal of Applied Genetics 52 (4): 413–435. doi:10.1007/s13353-011-0057-x. PMC 3189340. PMID 21698376.
- Fujimori S, Hirai N, Ohashi H, Masuoka K, Nishikimi A, Fukui Y, Washio T, Oshikubo T, Yamashita T, Miyamoto-Sato E (2012). "Next-generation sequencing coupled with a cell-free display technology for high-throughput production of reliable interactome data". Scientific reports 2: 691. Bibcode:2012NatSR...2E.691F. doi:10.1038/srep00691. PMC 3466446. PMID 23056904.
- "PRIZE Overview: Archon X PRIZE for Genomics"
- Genome.gov - Grant Information
- Severin J, Lizio M, Harshbarger J, Kawaji H, Daub CO, Hayashizaki Y, Bertin N, Forrest AR (2014). "Interactive visualization and analysis of large-scale sequencing datasets using ZENBU". Nat. Biotechnol. 32 (3): 217–9. doi:10.1038/nbt.2840. PMID 24727769.
- Shmilovici A,Ben-Gal I (2007). "Using a VOM model for reconstructing potential coding regions in EST sequences" (PDF). Computational Statistics 22 (1): 49–69. doi:10.1007/s00180-007-0021-8.
- Del Fabbro C, Scalabrin S, Morgante M, Giorgi FM (2013). "An Extensive Evaluation of Read Trimming Effects on Illumina NGS Data Analysis". PLoS ONE 8 (12): e85024. Bibcode:2013PLoSO...885024D. doi:10.1371/journal.pone.0085024. PMC 3871669. PMID 24376861.
- Martin, Marcel (2 May 2011). "Cutadapt removes adapter sequences from high-throughput sequencing reads". EMBnet.journal 17 (1): 10. doi:10.14806/ej.17.1.200.
- Smeds, Linnéa; Künstner, Axel; Donlin, Maureen J. (19 October 2011). "ConDeTri - A Content Dependent Read Trimmer for Illumina Data". PLoS ONE 6 (10): e26314. doi:10.1371/journal.pone.0026314.
- Spandow, O; Hellström, S; Schmidt, SH; De Paoli, Emanuale; Policriti, Alberto (2012). "ERNE-BS5: Aligning BS-treated Sequences by Multiple Hits on a 5-letters Alphabet". Proceedings of the ACM Conference on Bioinformatics, Computational Biology and Biomedicine 12: 12–19. doi:10.1145/2382936.2382938.
- Schmieder, R.; Edwards, R. (28 January 2011). "Quality control and preprocessing of metagenomic datasets". Bioinformatics 27 (6): 863–864. doi:10.1093/bioinformatics/btr026.
- Bolger, A. M.; Lohse, M.; Usadel, B. (1 April 2014). "Trimmomatic: a flexible trimmer for Illumina sequence data". Bioinformatics 30 (15): 2114–2120. doi:10.1093/bioinformatics/btu170.
- Cox, Murray P; Peterson, Daniel A; Biggs, Patrick J (2010). "SolexaQA: At-a-glance quality assessment of Illumina second-generation sequencing data". BMC Bioinformatics 11 (1): 485. doi:10.1186/1471-2105-11-485.
- Murray, TH (January 1991). "Ethical issues in human genome research.". FASEB journal : official publication of the Federation of American Societies for Experimental Biology 5 (1): 55–60. PMID 1825074.
- Robertson, John A. (August 2003). "The $1000 Genome: Ethical and Legal Issues in Whole Genome Sequencing of Individuals". The American Journal of Bioethics 3 (3): 35–42. doi:10.1162/152651603322874762.
- Henderson, Mark. "Human genome sequencing: the real ethical dilemmas". The Guardian. Retrieved 20 May 2015.
- Harmon, Amy (24 February 2008). "Insurance Fears Lead Many to Shun DNA Tests". The New York Times. Retrieved 20 May 2015.
- Statement of Administration policy, Executive Office of the President, Office of Management and Budget, April 27, 2007
- National Human Genome Research Institute (May 21, 2008). "President Bush Signs the Genetic Information Nondiscrimination Act of 2008". Retrieved Feb 17, 2014.
- Baker, Monya. "US ethics panel reports on DNA sequencing and privacy". Nature New Blog. Retrieved 20 May 2015.
- "Privacy and Progress in Whole Genome Sequencing" (PDF). Presidential Commission for the Study of Bioethical Issues. Retrieved 20 May 2015.
- Goldenberg, Aaron J.; Sharp, Richard R. (1 February 2012). "The Ethical Hazards and Programmatic Challenges of Genomic Newborn Screening". JAMA 307 (5): 461. doi:10.1001/jama.2012.68.
- Hughes, Virginia. "It’s Time To Stop Obsessing About the Dangers of Genetic Information". Slate Magazine. Retrieved 22 May 2015.
- Bloss, Cinnamon S.; Schork, Nicholas J.; Topol, Eric J. (10 February 2011). "Effect of Direct-to-Consumer Genomewide Profiling to Assess Disease Risk". New England Journal of Medicine 364 (6): 524–534. doi:10.1056/NEJMoa1011893.
- Rochman, Bonnie (25 October 2012). "What Your Doctor Isn’t Telling You About Your DNA". Time.com. Retrieved 22 May 2015.
|Library resources about
|Wikibooks has a book on the topic of: Next Generation Sequencing (NGS)|
- A wikibook on next generation sequencing
- A free didactic directory for DNA sequencing analysis.
- A The path to DNA sequencing: The life and work of Fred Sanger