Heteroplasmy

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Heteroplasmy is the presence of more than one type of organellar genome (mitochondrial DNA (mtDNA) or plastid DNA) within a cell or individual. It is an important factor in considering the severity of mitochondrial diseases. Because most eukaryotic cells contain many hundreds of mitochondria with hundreds of copies of mtDNA, it is common for mutations to affect only some mitochondria, leaving most unaffected.

Although detrimental scenarios are well-studied, heteroplasmy can also be beneficial. For example, centenarians show a higher than average degree of heteroplasmy.[1]

Microheteroplasmy is present in most individuals. This refers to hundreds of independent mutations in one organism, with each mutation found in about 1–2% of all mitochondrial genomes.[2]

Types of heteroplasmy[edit]

In order for heteroplasmy to occur, organelles must contain a genome and, in turn, a genotype. In animals, mitochondria are the only organelles that contain their own genomes, so these organisms will only have mitochondrial heteroplasmy. In contrast, photosynthetic plants contain mitochondria and chloroplasts, each of which contains plastid genomes. Therefore, plant heteroplasmy occurs in two dimensions.[3]

Organelle inheritance patterns[edit]

In 1909, while studying chloroplast genomes, Erwin Baur made the first observations about organelle inheritance patterns. Organelle genome inheritance differs from nuclear genome, and this is illustrated by four violations of Mendel's laws.[4]

  1. During asexual reproduction, nuclear genes never segregate during cellular divisions. This is to ensure that each daughter cell gets a copy of every gene. However, organelle genes in heteroplasmic cells can segregate because they each have several copies of their genome. This may result in daughter cells with differential proportions of organelle genotypes.[4]
  2. Mendel states that nuclear alleles always segregate during meiosis. However, organelle alleles may or may not do this.[4]
  3. Nuclear genes are inherited from a combination of alleles from both parents, making inheritance biparental. Conversely, organelle inheritance is uniparental, meaning the genes are all inherited from one parent.[4]
  4. It is also unlikely for organelle alleles to segregate independently, like nuclear alleles do, because plastid genes are usually on a single chromosome and recombination is limited by uniparental inheritance.[4]
There is a wide variety of mitochondrial DNA genotypes in the maternal pool, which is represented by the bottle. The two genotypes in this maternal pool are represented by blue and yellow. When generated, each oocyte receives a small subsampling of mitochondrial DNA molecules in differing proportions. This is represented by the conveyor belt with oocytes, each one unique, as they are produced.[5]

Vegetative segregation[edit]

Vegetative segregation, the random partitioning of cytoplasm, is a distinguishable characteristic of organelle heredity. During cell division, the organelles are divided equally, providing each daughter cell with a random selection of plasmid genotypes.[4]

Uniparental inheritance[edit]

Uniparental inheritance refers to the fact that, in most organisms, many offspring inherit organelle genes from only one parent. However, this is not a general law. Many organisms that have the ability to differentiate maternal and paternal sexes will produce offspring with a mixture of maternal, paternal, and biparental mitochondrial DNA.[4]

Mitochondrial bottleneck[edit]

The mitochondrial bottleneck concept refers to the classic evolutionary term, which is used to explain an event that reduces and specifies a population. It was developed to describe why mitochondrial DNA in an embryo might be drastically different from that of its mother. When a large population of DNA is subsampled, each sample population will receive a slightly different proportion of mitochondrial genotypes. Consequently, when paired with a high degree of replication, a rare or mutated allele can begin to proportionally dominate. In theory, this makes possible a single-generation shift of overall mitochondrial genotype.[5]

Selection[edit]

Although it is not well characterized, selection can occur for organelle genomes in heteroplasmic cells. Intracellular ("within cells") selection occurs within individual cells. It refers to the selective segregation of certain genotypes in mitochondrial DNA that allows the favoured genotype to thrive. Intercellular ("between cells") selection occurs on a larger scale, and refers to the preferential growth of cells that have greater numbers of a certain mitochondrial genotype.[4]

In mitochondrial DNA, there is evidence for potent germline purifying selection, as well as purifying selection during embryogenesis. Additionally, there is a dose-dependent decrease in reproduction ability for females that have mutations in mitochondrial DNA. This demonstrates another selection mechanism to prevent the evolutionary preservation of harmful mutations.[5]

Reduced recombination[edit]

It is very rare for organelle genes from different lineages to recombine. These genomes are usually inherited uniparentally, which does not provide a recombination opportunity. If they are inherited biparentally, it is unlikely that the organelles from the parents will fuse, meaning they will not share genomes.

However, it is possible for organelle genes from the same lineage to recombine. Intramolecular and intermolecular recombination can cause inversions and repeats in chloroplast DNA, and can produce subgenomic circles in mitochondrial DNA.[4]

Mitochondrial mutations in disease[edit]

Mutations in mitochondrial DNA are usually single nucleotide substitutions, single base insertions, or deletions.

Because each cell contains thousands of mitochondria, nearly all organisms house low levels of mitochondrial variants, conferring some degree of heteroplasmy. Although a single mutational event might be rare in its generation, repeated mitotic segregation and clonal expansion can enable it to dominate the mitochondrial DNA pool over time. When this occurs, it is known as reaching threshold, and it usually results in physiological consequences.[5]

Severity and time to presentation[edit]

Symptoms of severe heteroplasmic mitochondrial disorders do not usually appear until adulthood. Many cell divisions and a great deal of time are required for a cell to accumulate enough mutant mitochondria to cause symptoms. An example of this phenomenon is Leber optic atrophy. Generally, individuals with this condition do not experience vision difficulties until they have reached adulthood. Another example is MERRF syndrome (or Myoclonic Epilepsy with Ragged Red Fibers). In MELAS, heteroplasmy explains the variation in severity of the disease among siblings.

Screening[edit]

Preimplantation genetic screening (PGS) can be used to quantitate the risk of a child of being affected by a mitochondrial disease. In most cases, a muscle mutation level of approximately 18% or less confers a 95% risk reduction.[6]

Sequence illustrating heteroplasmy genotype of 16169 C/T in Nicholas II of Russia.[7]

Notable cases[edit]

One notable example of an otherwise healthy individual whose heteroplasmy was discovered incidentally is Nicholas II of Russia, whose heteroplasmy (and that of his brother) served to convince Russian authorities of the authenticity of his remains.[8]

See also[edit]

References[edit]

  1. ^ Rose G, Passarino G, Scornaienchi V, Romeo G, Dato S, Bellizzi D, Mari V, Feraco E, Maletta R, Bruni A, Franceschi C, De Benedictis G (2007). "The mitochondrial DNA control region shows genetically correlated levels of heteroplasmy in leukocytes of centenarians and their offspring". BMC GENOMICS 8: 293. doi:10.1186/1471-2164-8-293. PMC 2014781. PMID 17727699. 
  2. ^ Smigrodzki, R. M.; Khan, S. M. (2005). "Mitochondrial Microheteroplasmy and a Theory of Aging and Age-Related Disease". Rejuvenation Research 8 (3): 172–198. doi:10.1089/rej.2005.8.172. PMID 16144471.  edit
  3. ^ Korpelainen, H. (2004). "The evolutionary processes of mitochondrial and chloroplast genomes differ from those of nuclear genomes". Die Naturwissenschaften 91 (11): 505–518. doi:10.1007/s00114-004-0571-3. PMID 15452701. 
  4. ^ a b c d e f g h i Birky, C. William (2001). "The Inheritance of Genes in Mitochondria and Chloroplasts: Laws, Mechanisms, and Models". Annu. Rev. Gen. 35: 125–148. 
  5. ^ a b c d Stewart, J., Larsson, N. (2014). "Keeping mtDNA in shape between generations". PLoS Genetics 10 (10). doi:10.1371/journal.pgen.1004670. PMID 25299061. 
  6. ^ Hellebrekers, D. M. E. I.; Wolfe, R.; Hendrickx, A. T. M.; De Coo, I. F. M.; De Die, C. E.; Geraedts, J. P. M.; Chinnery, P. F.; Smeets, H. J. M. (2012). "PGD and heteroplasmic mitochondrial DNA point mutations: A systematic review estimating the chance of healthy offspring". Human Reproduction Update. doi:10.1093/humupd/dms008.  edit
  7. ^ Coble MD, Loreille OM, Wadhams MJ, Edson SM, Maynard K, Meyer CE, Niederstätter H, Berger C, Berger B, Falsetti AB, Gill P, Parson W, Finelli LN (2009). "Mystery solved: the identification of the two missing Romanov children using DNA analysis". PLoS ONE 4 (3): e4838. doi:10.1371/journal.pone.0004838. PMC 2652717. PMID 19277206. 
  8. ^ Ivanov PL, Wadhams MJ, Roby RK, Holland MM, Weedn VW, Parsons TJ (April 1996). "Mitochondrial DNA sequence heteroplasmy in the Grand Duke of Russia Georgij Romanov establishes the authenticity of the remains of Tsar Nicholas II". Nat. Genet. 12 (4): 417–20. doi:10.1038/ng0496-417. PMID 8630496.