ヘテロプラズミーは,MytilusのミトコンドリアDNAの双親による遺伝が限られていることを示唆している
W R Hoeh1, K H Blakley, W M Brown
1Laboratory for Molecular Systematics, Museum of Zoology, Ann Arbor, MI.
まとめ
Mytilus edulis 種群の貝は,典型的な動物の母性遺伝とは異なる,異常な双親のミトコンドリアDNA遺伝を示しています. 多くの個体はミトコンドリアDNAの混合 (ヘテロプラズミー) を示し,単一のミトコンドリアDNAタイプ (ホモプラズミー) の規範に異議を唱える.
科学分野:
- マリン・バイオロジーの海洋生物学
- 遺伝学 遺伝学とは
- ミトコンドリアDNAの遺伝
背景:
- ミトコンドリアDNA (mtDNA) は,通常,動物では母性的に受け継がれます.
- 個人は通常,単一のmtDNA集団 (ホモプラズミー) を所有しています.
- Mytilus edulis 種群のムッシルは,これらの一般規則に潜在的な例外を示しています.
研究 の 目的:
- Mytilus edulis種群のミトコンドリアDNAの遺伝パターンを調査する.
- Mytilus集団におけるヘテロプラズミアとホモプラズミアの有病率を決定する.
- Mytilusにおける双親のmtDNA遺伝に関する仮説を検証するために.
主な方法:
- Mytilus edulis 種群の150匹のミトコンドリアDNAの分析.
- ヘテロプラズミーとホモプラズミーを特定するために,個体内のミトコンドリアDNAタイプの評価.
- ヘテロプラズマ個体内の異なるタイプ間のミトコンドリアDNA配列の比較.
主要な成果:
- 検査した150匹のミティルスの個体のうち85匹がmtDNAのヘテロプラズミックであることが判明しました.
- ヘテロプラズマ個体内の異なるmtDNAタイプ間で,重要な配列の相違 (20 +/- 5%) が観察されました.
- ホモプラズマの個体は,異質プラズマの個体に見られるものと類似したmtDNAタイプを有していた.
結論:
- Mytilus musselsは,ミトコンドリアDNAヘテロプラズミーの高い頻度を示しています.
- この発見は,Mytilus.におけるミトコンドリアDNAの双親継承の仮説を強く支持しています.
- これは,動物界におけるmtDNAの厳格な母性遺伝に関する一般的な理解に異議を唱えている.
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