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大西洋トードのゲノム配列は,ユニークな免疫システムを明らかにしています
Bastiaan Star1, Alexander J Nederbragt, Sissel Jentoft
1Centre for Ecological and Evolutionary Synthesis, Department of Biology, University of Oslo, PO Box 1066, Blindern, N-0316 Oslo, Norway.
Nature
|August 12, 2011
まとめ
大西洋トードゲノムは,主要な組織相容性複合体 (MHC) II遺伝子の喪失を含む,ユニークな免疫システム適応を明らかにし,拡張されたMHC Iと変異したトール型受容体 (TLR) によって補償されます. これは,脊椎動物の免疫進化についての洞察を提供します.
科学分野:
- ゲノミクスゲノミクスとは
- 免疫学 免疫学とは
- 進化生物学の進化生物学について
背景:
- 大西洋トード (Gadus morhua) は商業的に重要であり,寒さに適応しています.
- そのゲノムを理解することは,漁業と水産養殖にとって極めて重要です.
- 免疫系の複雑さに関する以前の知識は限られていた.
研究 の 目的:
- 大西洋トードのゲノム配列を提示するために.
- その熱的適応と免疫構造を調査するために.
- 免疫系の進化を理解するために.
主な方法:
- 454技術 (ショットガンとペアエンドライブラリ) を使用したゲノムシーケンシング.
- タンパク質をコードする遺伝子を識別するために自動化された遺伝子アノテーション.
- MHCとTLRを含む免疫システムの構成要素の比較分析.
主要な成果:
- 22,154の識別された遺伝子を持つゲノムアセンブリ.
- ヘモグロビン遺伝子群における複雑な熱適応の証拠.
- メジャー・ヒストコンパティビリティ・コンプレックス (MHC) II経路遺伝子 (MHC II,CD4,インヴァリアントチェーン) の喪失.
- MHC I遺伝子の拡張とトール型受容体 (TLR) 家族のユニークな組成.
- 大西洋トークは,MHCIIが存在しないにもかかわらず,補償的な免疫メカニズムを示しています.
結論:
- 大西洋のトードゲノムは,寒さへの適応と水産養殖を理解するためのリソースを提供します.
- 魚は異常な免疫システム構造を持ち,重要な適応性免疫遺伝子が欠けている.
- 生まれつきの免疫と適応免疫の補償メカニズムは,脊椎動物の免疫システムのための新しい進化の経路を示唆しています.
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