野生のマウスの生存と突然変異の関連付け

Rowan D H Barrett¹, Stefan Laurent², Ricardo Mallarino^3,4

¹Redpath Museum and Department of Biology, McGill University, Montreal, Canada. rowan.barrett@mcgill.ca hoekstra@oeb.harvard.edu.

Science (New York, N.Y.)

|February 2, 2019

まとめ

野生のマウスは毛色の変化を通して適応的な進化を示していますアグーティ遺伝子の変異は生存とフェノタイプに影響し,集団のアレル頻度に影響し,自然選択のメカニズムを明らかにする.

科学分野:

進化生物学
遺伝学
エコロジー

背景:

適応的進化を予測することは,複雑な遺伝子型-フェノタイプ-フィットネスリンクのために困難です.
環境の変化が進化の軌道を動かす仕組みを理解することは極めて重要です

研究の目的:

野生のマウスの遺伝子型,フェノタイプ,フィットネスを明示的に結びつける.
適応進化におけるアグーティ遺伝子の役割を調査する
遺伝的多様性の生態学的結果を明らかにするためです

主な方法:

野生のマウスのフィールドと実験室での実験.
多様な土壌の色を用いた実験室で,色素特性の自然選択を推定する.
アゴッティ遺伝子の変異がコートの色と生存に与える影響を分析した.

主要な成果:

自然淘汰は土壌の色に反応して顔料の特徴とアグーティの位置に直接影響を及ぼします
特定のアゴッティ変異はタンパク質の結合特性を変えることで毛皮の色が明るくなる.
この変異は生存率の上昇と関連しています.

結論:

アグーティ遺伝子の変異は遺伝的変化,表型変化,体調の間の直接的なリンクを提供する.
生態学的要因は集団のアレル頻度の変化を誘導し,自然選択を例示しています.
この研究は配列変異によって引き起こされる適応進化の過程を明らかにしています

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