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The pseudoautosomal regions, PAR1, PAR2, and PAR3, are homologous sequences of nucleotides on the X and Y chromosomes. Although genetic recombination (occurring during sexual reproduction) is known to be limited only to the pseudoautosomal regions (PAR1 and PAR2) of the X and Y chromosomes, a 2013 study reports allelic unequal recombination between the XTR region Yp11.2 and Xq21.3, indicating the presence of a new PAR, which has been named PAR3. This PAR3 region, like PAR2, is exhibited in 2% of the general population. Also, the additional layer of justification has been provided from another study on six dyslexic cases which were shown to harbor duplications and deletions in the same Xq21.3 and Yp11.2 regions through allelic unequal recombination. The pseudoautosomal regions get their name because any genes within them (so far at least 29 have been found) are inherited just like any autosomal genes. PAR1 comprises 2.6 Mbp of the short-arm tips of both X and Y chromosomes in humans and great apes (X and Y are 155 Mbp and 59 Mbp in total). PAR2 is at the tips of the long arms, spanning 320 kbp. ==Location== The location of PAR1 and PAR2 on GRCh38 are: chrY:10,000-2,781,479 and chrY:56,887,902-57,217,415 chrX:10,000-2,781,479 and chrX:155,701,382-156,030,895 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pseudoautosomal region」の詳細全文を読む スポンサード リンク
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