単一のIGF1アレルは,犬の小型の主要な決定因子です

Nathan B Sutter¹, Carlos D Bustamante, Kevin Chase

¹National Human Genome Research Institute, Building 50, Room 5349, 50 South Drive MSC 8000, Bethesda, MD 20892-8000, USA.

Science (New York, N.Y.)

|April 7, 2007

まとめ

研究者らは,インスリン型の成長因子1 (IGF1) という重要な遺伝子を特定し,犬の種における重要な体格の違いを原因とした. IGF1の特定の変種が小型犬に多く見られ,その縮小した身長が説明される.

科学分野:

遺伝学遺伝学とは
動物生物学動物生物学
比較ゲノミクスとは

背景:

飼い犬は,陸上の脊椎動物と比べ物にならないような体格の多様性を示しています.
この変異の遺伝的基盤を理解することは,進化論と品種研究にとって極めて重要です.

研究の目的:

飼い犬における極端な体格の変動の遺伝的根拠を調査する.
犬のサイズに影響を与える特定の遺伝子と遺伝的変異を特定するために.

主な方法:

全ゲノムスキャンにより,品種内のサイズ変動に関連した定量的な特徴の位置 (QTL) を検出します.
小型犬種と巨大犬種の主要なQTLを囲む15メガ塩基間隔内の遺伝的多様性の分析.
選択的なスウィップと単核酸多形態化 (SNP) ハプロタイプの識別.

主要な成果:

QTLのサイズに影響を及ぼす主要な要因は,染色体15で特定されました.
インスリン類似成長因子1 (IGF1) 遺伝子の周りの選択的な掃描の証拠が見つかりました.
特定のIGF1 SNPハプロタイプは,小型品種では一般的であり,巨大品種では希少であり,サイズ決定におけるその役割を示している.

結論:

インスリン型の成長因子1 (IGF1) 遺伝子は,小型犬種における体格の主要な決定因子である.
IGF1の共通因果変異は,様々な小型犬種の縮小したサイズを説明している可能性が高い.
犬の品種構造は,複雑な特徴の遺伝的構造を解剖するための強力なモデルを提供します.

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