Chromosome 6 is one of the 23 pairs of chromosomes in humans. People normally have two copies of this chromosome. Chromosome 6 spans nearly 171 million base pairs (the building material of DNA) and represents between 5.5 and 6% of the total DNA in cells. It contains the major histocompatibility complex, which contains over 100 genes related to the immune response, and plays a vital role in organ transplantation.
The evolution of human centromere 6
The centromere of chromosome 6 illustrates an interesting example of centromere evolution. It was known[further explanation needed] that in a Catarrhini ancestor the chromosome 6 centromere was situated near position 26 Mb of the modern human chromosome. In Macaca mulatta, this old centromere went defunct and repositioned to a different chromosomal location[relevant?]. In the case of humans, the old centromere went defunct and a more recent form emerged near the modern position of human cen6 (size of 60 Mb). Such cases are known as Evolutionary New Centromeres (ENC). This assembly phenomenon of the human chromosome 6 gives researchers an opportunity to investigate the origin of the ENC on chromosome 6. [4]
In 2003, the entirety of chromosome 6 was manually annotated for proteins, resulting in the identification of 1,557 genes, and 633 pseudogenes.[5]
The following are some of the newer gene count estimates. 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.[6]
G-banding ideogram of human chromosome 6 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 6 in three different resolutions (400,[15] 550[16] and 850[3]). Band length in this diagram is based on the ideograms from ISCN (2013).[17] This type of ideogram represents actual relative band length observed under a microscope at the different moments during the mitotic process.[18]
G-bands of human chromosome 6 in resolution 850 bphs[19]
^For cytogenetic banding nomenclature, see article locus.
^ abThese values (ISCN start/stop) are based on the length of bands/ideograms from the ISCN book, An International System for Human Cytogenetic Nomenclature (2013). Arbitrary unit.
^gpos: Region which is positively stained by G banding, generally AT-rich and gene poor; gneg: Region which is negatively stained by G banding, generally CG-rich and gene rich; acenCentromere. var: Variable region; stalk: Stalk.
يو-989 الجنسية ألمانيا النازية الشركة الصانعة بلوم+فوس[1] المالك كريغسمارينه المشغل كريغسمارينه (22 يوليو 1943–14 فبراير 1945)[1][2] المشغلون الحاليون وسيط property غير متوفر. المشغلون السابقون وسيط property غير متوفر. التكلفة وسيط property غير متوفر. منظومة التعاريف ال
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