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ゲノムスケールのアプローチは,分子フィロゲニーにおける不一致の解決に役立ちます
Antonis Rokas1, Barry L Williams, Nicole King
1Howard Hughes Medical Institute, Laboratory of Molecular Biology, R. M. Bock Laboratories, University of Wisconsin-Madison, 1525 Linden Drive, Madison, Wisconsin 53706, USA.
Nature
|October 24, 2003
まとめ
単一の遺伝子からの系統樹は,しばしば対立する. 多くの遺伝子を組み合わせると,たとえわずか20個であっても,酵母種の関係を高い自信をもって解決し,進化論の研究を改善します.
科学分野:
- 分子系遺伝学 分子系遺伝学
- 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
背景:
- 個々の遺伝子の系統遺伝的不一致は,分子系統遺伝学における大きな課題である.
- 進化的関係を解決するには,堅固な系統樹が必要である.
研究 の 目的:
- 酵母種の遺伝子ツリー不一致を体系的に調査する.
- 矛盾する系統遺伝信号を解決する方法を特定する.
主な方法:
- オーソログ遺伝子の為の酵母ゲノム配列をスクリーニングした.
- 単一の遺伝子と連鎖遺伝子の遺伝子セットに関する系統遺伝学的分析を行いました.
- 分析されたデータセットは,単一の遺伝子から,選択された全106の遺伝子まで様々です.
主要な成果:
- 単一のまたは小さな遺伝子の連鎖は,しばしば対立するトポロジーをサポートします.
- 全106基因を連結すると,最大限のサポートで,単一の,完全に解消された酵母種の樹が生まれた.
- 少なくとも20の連鎖遺伝子は,比較可能な,堅固な系統遺伝的解像度を提供した.
結論:
- 系統遺伝子の不一致は,限られた遺伝子データで一般的です.
- 相当数の遺伝子を,たとえゲノムの一部であっても,連結させることは,正確な種樹の再構築に極めて重要です.
- このアプローチは,生命の樹の深い枝を解決するために重要な意味を持っています.
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