chromosome 20 chromosome 20 chromosome 20 is one of the 23 pairs of chromosomes in humans. chromosome 20 spans around 66 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. since then, due to sequencing improvements and fixes, the length of chromosome 20 has been updated to just over 66 million base pairs. chromosome 20human chromosome 20 pair after g-banding.one is from mother, one is from father.chromosome 20 pairin human male karyogram.featureslength (bp)66,210,255 bp(chm13)no. of genes516 (ccds)typeautosomecentromere positionmetacentric(28.1 mbp)complete gene listsccdsgene listhgncgene listuniprotgene listncbigene listexternal map viewersensemblchromosome 20entrezchromosome 20ncbichromosome 20ucscchromosome 20full dna sequencesrefseqnc_000020 (fasta) genbankcm000682 (fasta) genes number of genes the following are some of the gene count estimates of human chromosome 20. because researchers use different approaches to genome annotation their predictions of the number of genes on each chromosome varies (for technical details, see gene prediction). among various projects, the collaborative consensus coding sequence project (ccds) takes an extremely conservative strategy. so ccds's gene number prediction represents a lower bound on the total number of human protein-coding genes. estimated by protein-coding genes non-coding rna genes pseudogenes source release date ccds516—— 2016-09-08 hgnc519191297 2017-05-12 ensembl540594247 2017-03-29 uniprot550—— 2018-02-28 ncbi555487333 2017-05-19 gene list the following is a partial list of genes on human chromosome 20. for complete list, see the link in the infobox on the right. ada: adenosine deaminase (adenosine deaminase deficiency) andp: encoding protein activity-dependent neuroprotector homeobox ahcy: s-adenosylhomocysteine hydrolase apmap: encoding protein adipocyte plasma membrane-associated protein arfgef2: adp-ribosylation factor guanine nucleotide-exchange factor 2 (brefeldin a-inhibited) bcas1: breast carcinoma-amplified sequence 1 blcap: bladder cancer associated protein bmp2: bone morphogenetic protein 2 (osteoblast differentiation) bpifa1: encoding protein bpi fold containing family a, member 1 bpifa2: encoding protein bpi fold containing family a, member 2 bpifa3: encoding protein bpi fold containing family a, member 3 bpifa4p: non-coding pseudogene of the bpi fold containing family a, member 4p bpifb1: encoding protein bpi fold containing family b, member 1 bpifb2: encoding protein bpi fold containing family b, member 2 bpifb3: encoding protein bpi fold containing family b, member 3 bpifb4: encoding protein bpi fold containing family b, member 4 bpifb5p: non-coding pseudogene of the bpi fold containing family b, member 5p bpifb6: encoding protein bpi fold containing family b, member 6 bpifb9p: non-coding pseudogene of the bpi fold containing family b, member 9p c20orf27: encoding protein upf0687 protein c20orf27 csrp2bp: encoding protein csrp2 binding protein cst9l: cystatin-9-like cstl1: cystatin-like 1 ctcfl: ccctc-binding factor-like ctnnbl1: beta-catenin-like protein 1 dbndd2: dysbindin domain-containing protein 2 ddx27: dead box polypeptide 27 defb118, defb119, defb126, defb127, defb129: beta-defensin genes dlgap4: disks large-associated protein 4 dnajc5: cysteine string protein edem2: er degradation-enhancing alpha-mannosidase-like 2 edn3: endothelin 3 entpd6: ectonucleoside triphosphate diphosphohydrolase 6 esf1: esf1 nucleolar pre-rrna processing protein homolog fam210b: encoding protein fam210b fastkd5: encoding protein fast kinase domain-containing protein 5 (fastkd5) fitm2: encoding protein fat storage-inducing transmembrane protein 2 gzf1: encoding protein gdnf-inducible zinc finger protein 1 gmeb2: glucocorticoid modulatory element-binding protein 2 gnas1: gs alpha subunit (membrane g-protein) gss: glutathione synthetase itpa: encoding enzyme inosine triphosphate pyrophosphatase jag1: jagged 1 (alagille syndrome) jph2: encoding protein junctophilin 2 kiz: encoding protein kizuna centrosomal protein kua-uev: lime1: encoding protein lck-interacting transmembrane adapter 1 lzts3: encoding protein leucine zipper, putative tumor suppressor family member 3 mroh8: encoding protein maestro heat like repeat family member 8 napb: encoding protein beta-soluble nsf attachment protein ndufaf5: encoding protein nadh:ubiquinone oxidoreductase complex assembly factor 5 nnat: encoding protein neuronatin nol5a: encoding protein nucleolar protein 56 nrsn2: encoding protein neurensin-2 otor: encoding protein otoraplin pank2: pantothenate kinase 2 (pantothenate kinase-associated neurodegeneration) pkig: encoding protein camp-dependent protein kinase inhibitor gamma plagl2: encoding protein zinc finger protein plagl2 polr3f: encoding enzyme dna-directed rna polymerase iii subunit rpc6 pric285: prnp: prion protein (p27-30) (creutzfeldt–jakob disease, gerstmann-strausler-scheinker syndrome, fatal familial insomnia) pxmp4: encoding protein peroxisomal membrane protein 4 r3hdml: encoding protein r3h domain containing-like rtf2: encoding protein rtf2 homolog sall4: sal-like 4 (drosophila) serinc3: encoding protein serine incorporator 3 shld1: encoding protein shieldin complex subunit 1 slc17a9: encoding protein solute carrier family 17 member 9 slc2a4rg: encoding protein slc2a4 regulator slx4ip: encoding protein slx4 interacting protein spata2: encoding protein spermatogenesis-associated protein 2 spef1: encoding protein sperm flagellar protein 1 srxn1: encoding protein sulfiredoxin-1 stau1: encoding protein double-stranded rna-binding protein staufen homolog 1 stk35l1: encoding protein stk35l1 sun5: encoding protein sun domain-containing protein 5 tasp1: encoding enzyme threonine aspartase 1 ttg: tissue transglutaminase (auto antigen of celiac disease) tmepai: encoding protein transmembrane prostate androgen-induced protein ttpal: encoding protein tocopherol (alpha) transfer protein-like uckl1: encoding enzyme uridine-cytidine kinase-like 1 uqcc: encoding enzyme ubiquinol-cytochrome c reductase complex chaperone cbp3 homolog vapb: vamp (vesicle-associated membrane protein)-associated protein b and c ythdf1: encoding protein yth domain family, member 1 zfp64 encoding protein zinc finger protein 64 homolog, isoforms 1 and 2 zgpat: encoding protein zinc finger ccch-type with g patch domain-containing protein zhx3: encoding protein zinc fingers and homeoboxes protein 3 znf334: encoding protein zinc finger protein 334 znf343: encoding protein zinc finger protein 343 zswim3: encoding protein zinc finger swim-type containing 3 zmynd8: encoding enzyme protein kinase c-binding protein 1 znf133: encoding protein zinc finger protein 133 diseases and 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 fatal familial insomnia galactosialidosis - ctsa maturity onset diabetes of the young type 1 neuronal ceroid lipofuscinosis pantothenate kinase-associated neurodegeneration transmissible spongiform encephalopathy (prion diseases) waardenburg syndrome cytogenetic band g-banding ideograms of human chromosome 20g-banding ideogram of human chromosome 20 in resolution 850 bphs. band length in this diagram is proportional to base-pair length. this type of ideogram is generally used in genome browsers (e.g. ensembl, ucsc genome browser).g-banding patterns of human chromosome 20 in three different resolutions (400, 550 and 850). band length in this diagram is based on the ideograms from iscn (2013). this type of ideogram represents actual relative band length observed under a microscope at the different moments during the mitotic process. g-bands of human chromosome 20 in resolution 850 bphs chr. arm band iscnstart iscnstop basepairstart basepairstop stain density 20p 13033315,100,000 gneg 20p 12.33335135,100,0019,200,000 gpos75 20p 12.25136249,200,00112,000,000 gneg 20p 12.162491512,000,00117,900,000 gpos75 20p 11.23915116417,900,00121,300,000 gneg 20p 11.221164127521,300,00122,300,000 gpos25 20p 11.211275144122,300,00125,700,000 gneg 20p 11.11441160825,700,00128,100,000 acen 20q 11.11608177428,100,00130,400,000 acen 20q 11.211774192730,400,00133,500,000 gneg 20q 11.221927205133,500,00135,800,000 gpos25 20q 11.232051223235,800,00139,000,000 gneg 20q 122232243939,000,00143,100,000 gpos75 20q 13.112439257843,100,00143,500,000 gneg 20q 13.122578275843,500,00147,800,000 gpos25 20q 13.132758307747,800,00151,200,000 gneg 20q 13.23077329951,200,00156,400,000 gpos75 20q 13.313299338256,400,00157,800,000 gneg 20q 13.323382349357,800,00159,700,000 gpos50 20q 13.333493377059,700,00164,444,167 gneg