哺乳類におけるY染色体の起源と機能的進化
Diego Cortez1, Ray Marin1, Deborah Toledo-Flores2
11] Center for Integrative Genomics, University of Lausanne, 1015 Lausanne, Switzerland [2] Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland.
Nature
|April 25, 2014
まとめ
Y染色体は,Y染色体である
科学分野:
- ゲノミクスゲノミクスとは
- 進化生物学の進化生物学について
- 性別決定の方法について
背景:
- Y染色体は哺乳類の性別決定に不可欠ですが,繰り返しの配列のために研究することは困難です.
- Y染色体の進化を理解することは,種間の性決定機構を理解するための鍵です.
研究 の 目的:
- 先進的なシーケンシング技術を使用して,哺乳類のY染色体の進化史を調査する.
- 哺乳類と鳥類における性染色体の起源と進化の軌道を特定する.
主な方法:
- 15種の哺乳類のゲノムとトランスクリプトームのシーケンス解析.
- Y染色体の進化を追跡し,性別を決定する遺伝子を特定するための比較ゲノム分析.
主要な成果:
- 哺乳類と鳥類において,性染色体の3つの独立した起源が特定されました.
- 鳥類のY染色体 (SRYを含む) は,鳥類のW染色体 (約1.4億年前) と異なっており,約1.8億年前に発生した.
- Y/W遺伝子のレパートリーは小さく,規制機能に富み,分層化後も安定している.
結論:
- 哺乳類と鳥類の性染色体進化は,独立した起源と機能的シフトにもかかわらず保存された遺伝子の内容を含んでいる.
- Y染色体遺伝子の保存は,投与制限と規制メカニズムによって引き起こされる可能性があり,いくつかの遺伝子は新しい丸特有の機能を獲得します.
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