大規模なハプロタイプは,日の生態型差異の基礎となっている

Marco Todesco^1,2, Gregory L Owens^1,2,3, Natalia Bercovich^4,5

¹Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada.

Nature

|July 10, 2020

まとめ

大規模で再結合しないハプロタイプブロックは,野生の紫陽花に適応性のあるアレルを維持し,生態型の差異化を促進します. この生態型適応の過程において,構造的な変化が重要な役割を果たします.

科学分野:

進化生物学
遺伝学
エコロジー

背景:

種はしばしば多様な環境に適応した生態型を含みます.
生態型形成と維持のメカニズムは,特にハイブリッド化では,まだ十分に理解されていません.

研究の目的:

野生の紫陽花における生態型差異の遺伝的基礎を調査する.
異なる環境で適応特性を維持するゲノム領域とメカニズムを特定する.

主な方法:

3種 (Helianthus annuus,H. petiolaris,H. argophyllus) の1506種の野生の紫陽花を再配列した.
大規模で再結合しないハプロタイプブロックの特定と分析
生態学的特徴と環境要因とのハプロタイプブロックの関連分析

主要な成果:

生態学的特徴と環境条件に関連した37の大きな (1-100 Mbp) 非再結合ハプロタイプブロックを発見した.
これらのブロックは適応性のあるアレルを維持し,日の生態型を区別し,開花時間や種子サイズなどの特性に重要な影響を及ぼします.
ハプロタイプブロックは高度に異なっており,構造的変異と関連しており,関連種の内向性を表す可能性があります.

結論:

特定のハプロタイプブロック内の限られた再結合は,適応性のあるアレル組合せを維持し,エコタイプの分岐を促すのに不可欠です.
構造的多様性は,野生の紫陽花の生態型適応に大きく寄与する.

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