ベイジアン系遺伝学を用いた早期の胎盤哺乳類放射線の解像度

W J Murphy¹, E Eizirik, S J O'Brien

¹Laboratory of Genomic Diversity, National Cancer Institute, Frederick, MD 21702, USA.

Science (New York, N.Y.)

|December 18, 2001

まとめ

胎盤哺乳類の系統化は,約1億3千万年前に発生した,最も初期の分岐群であるAfrotheriaを明らかにします. この発見は,胎盤哺乳類の初期の生物地理的歴史を理解するのに役立ちます.

科学分野:

進化生物学の進化生物学について
分子系遺伝学分子系遺伝学
哺乳類の古生物学について

背景:

胎盤哺乳類の系統学は,部分的に4つの主要グループに分かれています.
完全な配列間関係と根の位置は不明のままである.
早期の胎盤の生物地理を理解するには,これらの系統遺伝的不確実性を解決する必要があります.

研究の目的:

分子データを用いて胎盤哺乳類の系統を調査する.
インターオーダーナル関係の完全な階層を確立する.
根の位置と,初期の生物地理学への影響を決定する.

主な方法:

ベイジアンと最大確率の系統遺伝的方法を使用した.
総合的な16.4キロベース分子データセットを使用した.
解析された配列間関係と分岐時間.

主要な成果:

インターオーダーナル関係のほぼ完全な解消を達成しました.
Afrotheriaと他の胎盤の間の基礎分裂を特定しました.
この基礎分裂は約1億3千万年前と年代付けされ,南米とアフリカの白亜紀の分離と関連している可能性がある.

結論:

胎盤哺乳類の起源はおそらく南半球 (ゴンドワナ) にある.
アフロテリアの初期の分岐は,哺乳類の生物地理学的歴史に対する重要な洞察を提供します.
この研究は,胎盤哺乳類の進化的関係と古代の分布に関する私たちの理解を洗練します.

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