Evidence for different origin of sex chromosomes in snakes, birds, and mammals and step-wise differentiation of snake sex chromosomes.
スポンサーリンク
概要
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All snake species exhibit genetic sex determination with the ZZ/ZW type of sex chromosomes. To investigate the origin and evolution of snake sex chromosomes, we constructed, by FISH, a cytogenetic map of the Japanese four-striped rat snake (Elaphe quadrivirgata) with 109 cDNA clones. Eleven of the 109 clones were localized to the Z chromosome. All human and chicken homologues of the snake Z-linked genes were located on autosomes, suggesting that the sex chromosomes of snakes, mammals, and birds were all derived from different autosomal pairs of the common ancestor. We mapped the 11 Z-linked genes of E. quadrivirgata to chromosomes of two other species, the Burmese python (Python molurus bivittatus) and the habu (Trimeresurus flavoviridis), to investigate the process of W chromosome differentiation. All and 3 of the 11 clones were localized to both the Z and W chromosomes in P. molurus and E. quadrivirgata, respectively, whereas no cDNA clones were mapped to the W chromosome in T. flavoviridis. Comparative mapping revealed that the sex chromosomes are only slightly differentiated in P. molurus, whereas they are fully differentiated in T. flavoviridis, and E. quadrivirgata is at a transitional stage of sex-chromosome differentiation. The differentiation of sex chromosomes was probably initiated from the distal region on the short arm of the protosex chromosome of the common ancestor, and then deletion and heterochromatization progressed on the sex-specific chromosome from the phylogenetically primitive boids to the more advanced viperids.
- The National Academy of Sciencesの論文
- 2006-11-28
著者
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Agata K
Dep. Of Biophysics Graduate School Of Sci. Kyoto Univ.
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Agata Kiyokazu
Lab. Mol. Dev. Biol. Grad. Sch. Sci. Kyoto Univ.
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Agata Kiyokazu
理化学研究所発生再生科学総合研究センター
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Agata Kiyokazu
Genome Resource And Analysis Subunit Riken Center For Developmental Biology
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Yamada K
Lab. Anim. Cytogenet Creative Res. Initiative "sousei" Hokkaido Univ.
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Tarui Hiroshi
Genome Resource And Analysis Subunit Riken Center For Developmental Biology
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Tarui Hiroshi
Evolutionary Regeneration Group Center For Developmental Biology Riken
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Agata Kiyokazu
Dep. Of Biophysics Graduate School Of Sci. Kyoto Univ.
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Agata Kiyokazu
Laboratory For Evolutionary Regeneration Center For Developmental Biology Riken
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Agata Kiyokazu
Riken Cdb Evo.
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TORIBA Michihisa
Japan Snake Inst.
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Agata Kiyokazu
Group For Evolutionary Regeneration Biology Center For Developmental Biology Riken Kobe
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Yamada Kazuhiko
Lab. Animal Cytogenet. Dept. Genome Dyn. Creative Res. Initiative "sousei
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Matsuda Yoichi
Lab. Anim. Cytogenet Creative Res. Initiative "sousei" Hokkaido Univ.
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Matsuda Yoichi
Grad. Sch. Sci. Hokkaido Univ.:cris Hokkaido Univ.
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Matsuda Yoichi
Grad. Sch. Life Sci. Hokkaido Univ.:lab. Anim. Cytogenet. Div. Genome Dyn. Creative Res. Initiative
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Tarui Hiroshi
Evolutionary Regeneration Group Center For Developmental Biology
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Nishida-umehara Chizuko
Lab. Anim. Cytogenet Creative Res. Initiative "sousei" Hokkaido Univ.
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Nishiyama Chigusa
Grad. Sch. Sci. Hokkaido Univ.
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Agata Kiyokazu
Lab. For Mol. Dev. Biol. Dept. Of Biophys. Grad. Sch. Of Sci. Kyoto Univ.
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Matsuda Yoichi
Cent. Adv. Sci. Tech. Hokkaido Univ.:grad. Sch. Environ. Earth Sci. Hokkaido Univ.:fac. Sci. Hokkaid
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Nishida Chizuko
Lab. Anim. Cytogenet Creative Res. Initiative "sousei" Hokkaido Univ.
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Nishida-umehara Chizuko
Grad. Sch. Sci. Hokkaido Univ.
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Matsuda Yoichi
Lab. Mol. Cell. Genet. Dept. Biol. Sci. Grad. Sch. Sci.:lab. Animal Cytogenet. Dept. Genome Dyn. Cre
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Matsubara Kazumi
Lab. Anim. Cytogenet Creative Res. Initiative "sousei" Hokkaido Univ.
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Matsuda Yoichi
Grad. Sch. Life Sci. Hokkaido Univ.:lab. Anim. Cytogenet. Div. Genome Dyn. Creative Res. Initiative
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