Chromosome 20 (human)
|Chromosome 20 (human)|
|Length (bp)||63,025,520 bp|
|Number of genes||897 (NCBI)
|Centromere position||Metacentric |
Chromosome 20 is one of the 23 pairs of chromosomes in humans. People normally have two copies of this chromosome. Chromosome 20 spans around 63 million base pairs (the building material of DNA) and represents between 2 and 2.5 percent of the total DNA in cells. Chromosome 20 was fully sequenced in 2001 and was reported to contain over 59 million base pairs representing 99.4% of the euchromatic DNA. Since then, due to sequencing improvements and fixes, the length of chromosome 20 has been updated to just over 63 million base pairs.
Identifying genes on each chromosome is an active area of genetic research. Because researchers use different approaches to predict the number of genes on each chromosome, the estimated number of genes varies. Depending on the genome annotation used, chromosome 21 contains 897 or 1,068 genes. New discoveries[when?] have recently linked this chromosome to the increasing susceptibility to male-pattern baldness.
The following are some of the genes located on chromosome 20:
- AHCY: S-adenosylhomocysteine hydrolase
- ARFGEF2: ADP-ribosylation factor guanine nucleotide-exchange factor 2 (brefeldin A-inhibited)
- BMP2: Bone Morphogenetic Protein 2 (osteoblast differentiation)
- DNAJC5: Cysteine string protein
- EDN3: endothelin 3
- GSS: glutathione synthetase
- GNAS1: Gs alpha subunit (membrane G-protein)
- JAG1: jagged 1 (Alagille syndrome)
- PANK2: pantothenate kinase 2 (Hallervorden-Spatz syndrome)
- PRNP: prion protein (p27-30) (Creutzfeld-Jakob disease, Gerstmann-Strausler-Scheinker syndrome, fatal familial insomnia)
- tTG: tissue transglutaminase (Celiac disease)
- SALL4: sal-like 4 (Drosophila)
- VAPB: VAMP (vesicle-associated membrane protein)-associated protein B and C
Diseases & disorders
The following diseases are some of those related to genes on chromosome 20:
- Albright's hereditary osteodystrophy
- Arterial tortuosity syndrome
- Adenosine deaminase deficiency
- Alagille syndrome
- Celiac disease
- Galactosialidosis - CTSA
- Maturity onset diabetes of the young type 1
- Neuronal ceroid lipofuscinosis
- Pantothenate kinase-associated neurodegeneration
- Transmissible spongiform encephalopathy (prion diseases)
- Waardenburg syndrome
- "Homo sapiens chromosome 20, GRCh37.p13 Primary Assembly". National Center for Biotechnology Information. Retrieved October 17, 2013.
- "Table 2.3, Human chromosome groups - Human Molecular Genetics - NCBI Bookshelf". Garland Science via National Center for Biotechnology Information. Retrieved November 17, 2013.
- Deloukas P, et al. (2001). "The DNA sequence and comparative analysis of human chromosome 20". Nature 414 (6866): 865–871. doi:10.1038/414865a. PMID 11780052.
- "Map Viewer". National Center for Biotechnology Information. Retrieved October 17, 2013.
- "Vega Genome Browser 54: Homo sapiens - Chromosome summary - Chromosome 20: 1-62,965,520". Wellcome Trust Sanger Institute. Retrieved October 17, 2013.
- Gilbert F (1997). "Disease genes and chromosomes: disease maps of the human genome". Genet Test 1 (3): 225–229. doi:10.1089/gte.1997.1.225. PMID 10464650.
- Human Chromosome 20 Map Viewer — on NCBI
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