ダーウィンの選択は,自己の位置にある.
Kentaro K Shimizu1, Jennifer M Cork, Ana L Caicedo
1Department of Genetics, North Carolina State University, Box 7614, Raleigh, NC 27695, USA.
Science (New York, N.Y.)
|December 18, 2004
まとめ
アラビドプシス・タリアナの自己受粉の進化は,自己不適合の位置にある偽遺伝子によって引き起こされ,遺伝的多様性が減少しました. この最近の適応現象は,植物に関連している可能性があります.
科学分野:
- 進化生物学の進化生物学について
- 植物遺伝学 植物遺伝学
- 分子進化は分子進化である.
背景:
- 自己受粉は,開花植物における一般的な進化的移行である.
- アラビドプシス・タリアナでは,自己相容性受容体 (SCR) と自己相容性受容体キナーゼ (SRK) の位置にある擬似遺伝子が自己受精の進化に関与している.
- 陽性方向性選択によるSCRの擬似アレルにおいて,減少した核酸変異が観察される.
研究 の 目的:
- アラビドプシス・タリアナの自己受粉への移行を促す進化的メカニズムを調査する.
- 自己受精の進化におけるSCRおよびSRKロシにおける偽遺伝子の役割を決定する.
- この適応的イベントのタイミングと潜在的な生態学的な関連性を探求する.
主な方法:
- SCRとSRKの自己相容れない位置における偽遺伝子アレルの分析.
- SCR偽遺伝子アレルに作用するポジティブな方向性選択の識別.
- アダプティブイベントのタイミングと,プレイストセンの後の膨張との関連を推論するためのコアレスセントシミュレーション.
主要な成果:
- ポジティブ・ディレクショナル・セレクションにより,SCR.のシドゲンアレルの進化的固定が生じました.
- この固定により,これらの場所での核酸の変動が著しく減少しました.
- コアレスセントシミュレーションは,適応的イベントが最近であり,プライストセンの後のアラビドプシス・サリアナの拡大と潜在的に関連していることを示唆しています.
結論:
- アラビドプシス・タリアナの自己受粉の進化は,SCRとSRKのロシオで擬似遺伝子のアレルの固定と関連しています.
- ポジティブ・セレクションによって引き起こされるこの移行は,遺伝的多様性を著しく減少させた.
- 自己受粉に関連する補助的な形態学的革新は,自己不適合性の喪失後に急速に進化する可能性があります.
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