Résumé
Chromosome 5 is one of the 23 pairs of chromosomes in humans. People normally have two copies of this chromosome. Chromosome 5 spans about 182 million base pairs (the building blocks of DNA) and represents almost 6% of the total DNA in cells. Chromosome 5 is the 5th largest human chromosome, yet has one of the lowest gene densities. This is partially explained by numerous gene-poor regions that display a remarkable degree of non-coding and syntenic conservation with non-mammalian vertebrates, suggesting they are functionally constrained. Because chromosome 5 is responsible for many forms of growth and development (cell divisions) changes may cause cancers. One example would be acute myeloid leukemia (AML). The following are some of the gene count estimates of human chromosome 5. 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. Genes on human chromosome 5 The following is a partial list of genes on human chromosome 5. For complete list, see the link in the infobox on the right. The following are some of the diseases related to genes located on chromosome 5: Achondrogenesis type 1B Atelosteogenesis, type II Bosch-Boonstra-Schaaf optic atrophy syndrome Charcot–Marie–Tooth disease, type 4 Cockayne syndrome Cornelia de Lange syndrome Corneal dystrophy of Bowman layer Cri du chat Diastrophic dysplasia Ehlers-Danlos syndrome Familial adenomatous polyposis Granular corneal dystrophy type I Granular corneal dystrophy type II GM2-gangliosidosis, AB variant Homocystinuria 3-Methylcrotonyl-CoA carboxylase deficiency Myelodysplastic syndrome Netherton syndrome Nicotine dependency Parkinson's disease Primary carnitine deficiency Recessive multiple epiphyseal dysplasia Sandhoff disease Spinal muscular atrophy Sotos Syndrome Survival motor neuron spinal muscular atrophy Treacher Collins syndrome Tricho-hepato-enteric syndrome Usher syndrome The following conditions are caused by changes in the structure or number of copies of chromosome 5: Cri-du-chat syndrome is caused by a deletion of the end of the short (p) arm of chromosome 5.
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