人間の遺伝子と配列ベースの物理マップの比較

A Yu¹, C Zhao, Y Fan

¹Center for Medical Genetics, Marshfield Medical Research Foundation, Wisconsin 54449, USA.

Nature

|March 10, 2001

まとめ

この研究では,ヒトゲノム配列を用いて,全ゲノムのヒト再結合率を推定しています. 再結合の有意な多様性を明らかにし,独特の遺伝的特徴を持つ"砂漠"と"ジャングル"を特定しました.

科学分野:

遺伝学遺伝学とは
ゲノミクスゲノミクスとは
進化生物学の進化生物学について

背景:

再結合,すなわちメオシス中の同性染色体間の遺伝物質の交換は,進化にとって極めて重要です.
正確な物理的な地図は,再結合率を計算するために不可欠であり,ヒトゲノム配列は前例のない精度を提供します.

研究の目的:

ゲノムの約60%にわたるヒト再結合率を推定する.
人間のゲノム配列を用いて遺伝的,物理的な地図を比較する.
再結合率の変動に影響を与える要因を特定する.

主な方法:

人間のゲノム配列から得られた遺伝的および物理的な地図を比較する.
核酸毎の再結合率を計算する.
配列とマーカーパラメータを分析し,再結合率と相関する.

主要な成果:

再結合率は,染色体に沿って,0から少なくとも9cM Mb(-1) までの実質的な変動を示します.
男性のメタセントリック染色体上の相対マーカーの位置は,再結合率と強く相関しています.
異常に低い再結合率 (砂漠) や高い再結合率 (ジャングル) を有する染色体領域が特定されました.

結論:

人間のゲノム配列は,再結合率の正確な推定と再結合ホットスポットとコールドスポットの識別を可能にします.
再結合砂漠は,再結合ジャングルと比較して,より高く,より広範な連結不均衡を示しています.
再結合率の変動を理解することは,ゲノム進化と遺伝的多様性を理解するための鍵です.

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