家庭用および野生の酵母菌の集団ゲノミクス
Gianni Liti1, David M Carter, Alan M Moses
1Institute of Genetics, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK.
Nature
|February 13, 2009
まとめ
この研究では,70種類以上のベーカーの酵母 (Saccharomyces cerevisiae) とSaccharomyces paradoxusの単離物を配列化しました. 発見は,Saccharomyces cerevisiaeの集団構造は人間の影響によって形作られ,交配と新しい変異につながることを示しています.
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
- 微生物学 微生物学とは
背景:
- Saccharomyces cerevisiaeのゲノムシーケンシングは,ゲノム進化の理解を深めた.
- 野生酵母菌の生命史,生態学的分布,および集団構造に関する知識は限られている.
- 酵母集団の適応,表型変異,生殖的孤立を促す進化過程は,全ゲノムレベルで十分に理解されていません.
研究 の 目的:
- Saccharomyces cerevisiaeとSaccharomyces paradoxusの全ゲノム多様性を分析するために.
- これらの酵母種の集団構造と進化的関係を調査する.
- 酵母菌の多様性に対する進化過程と人間の影響の役割を理解する.
主な方法:
- Saccharomyces cerevisiaeとSaccharomyces paradoxusの70種類以上の単離物の全ゲノム配列を解析しました.
- 遺伝子の含有量,単一ヌクレオチドポリモルフィズム (SNPs),挿入/削除 (indels),複製数変異 (CNVs),および転置可能な要素の分析.
- ゲノム全体の関係とフェノタイプの変動を相関させるための系統遺伝分析.
主要な成果:
- フェノタイプ的変異は,一般的に,全ゲノムにわたる世界的な系統遺伝的関係と相関しています.
- Saccharomyces paradoxusの集団は,明確な地理的境界線を示しています.
- Saccharomyces cerevisiaeの孤立種は,S. paradoxusの単一集団と比較して,全体的に差異化が少なく,広範な交配を示しています.
- Saccharomyces cerevisiaeの集団構造は,いくつかの家畜化イベントではなく,複数の地理的に孤立した系統とモザイク形式を示唆しています.
結論:
- 人間の影響により,Saccharomyces cerevisiaeの系統の交配が容易になり,既存の多様性の新しい組み合わせが生まれました.
- Saccharomyces cerevisiaeの集団構造は複雑で,地理的隔離と人間による添加物によって形成されています.
- 酵母集団の遺伝学を理解することで,適応と種化プロセスに関する洞察が得られます.
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