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人間と猿のY染色体におけるパリンドロームの腕間の豊富な遺伝子変換
Steve Rozen1, Helen Skaletsky, Janet D Marszalek
1Howard Hughes Medical Institute, Department of Biology, Massachusetts Institute of Technology, 9 Cambridge Center, Cambridge, Massachusetts 02142, USA.
Nature
|June 20, 2003
まとめ
人間のY染色体には,人間とチンパンジーの分岐に先立つパリンドロームが含まれています. Y染色体 (MSY) の男性特異領域のこれらのパリンドロミック領域は,遺伝子変換によって進化し,丸遺伝子ファミリー進化に影響を与えます.
科学分野:
- 遺伝学 遺伝学とは
- 進化生物学の進化生物学について
- ゲノミクスゲノミクスとは
背景:
- Y染色体 (MSY) の男性特有の領域には,8つのパリンドロームがあり,そのユークロマティックDNAの重要な部分を構成しています.
- これらのパリンドロームは丸特異的な遺伝子を備えており,両腕の間に高い配列同一性 (99.97%) を表しており,最近の重複イベントを示唆しています.
- 以前の解釈では,これらのパリンドロームが約10万年前に形成されたと示唆されていた.
研究 の 目的:
- 類人猿の比較シーケンスを用いてMSYパリンドロームの進化年齢を調査する.
- MSYのパリンドロームが人間とチンパンジーの分岐に先行するかどうかを判断する.
- MSYパリンドロームおよび関連する遺伝子ファミリーの進化における遺伝子変換の役割を理解する.
主な方法:
- 人間と類人猿の系統におけるMSYパリンドロームの比較シーケンシング.
- 現代のヒト集団におけるMSYパリンドローム内の配列変化の分析.
- MSYパリンドロームの進化史を確立するための系統遺伝分析.
主要な成果:
- 8つのMSYパリンドロームのうち少なくとも6つは,人間とチンパンジーの系統の分岐 (約500万年前) より前のものです.
- ヒトの系統におけるMSYパリンドローム内での再発的な腕から腕への遺伝子変換の証拠.
- 重要なニュクレオチド変換 (約. 最近の進化の過程でY-Y遺伝子の変換を経て発生した.
結論:
- MSYパリンドロームは,ヒトとチンパンジーの種化より前の古代の構造です.
- 遺伝子変換は,MSYパリンドロームアームの協調的な進化を推進する重要なメカニズムです.
- 繰り返し発生するY-Y遺伝子変換は,ヒトY染色体上の多複製の丸遺伝子ファミリーの進化において重要な役割を果たしています.
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