31,228 人の精子ゲノムからのメオシスの変化に関する洞察

Avery Davis Bell^1,2, Curtis J Mello^3,4, James Nemesh^3,4

¹Department of Genetics, Harvard Medical School, Boston, MA, USA. averydavisbell@gmail.com.

Nature

|June 5, 2020

まとめ

メイオシスは変化し,誤りやすい. 精子配列分析は,染色体クロスオーバーと分離がどのように変化し,アヌプロイド率とヒトゲノム異常に影響を及ぼすかを明らかにする.

科学分野:

遺伝学
生殖生物学
ゲノミクス

背景:

メイオシスは性繁殖に不可欠ですが,変動するクロスオーバー率とアヌプロイドに繋がる染色体分離の誤差を含む変異性と誤差があります.
これらの生殖変異を理解することは生殖健康と遺伝的多様性を理解するための鍵です

研究の目的:

何千ものヒト精子のクロスオーバーと分離を含むメオティックの結果の変動性を調査する.
異なるメオティック現象型が個体内で,また個体間でどのように変化するのかを特定する.

主な方法:

数千個の精子の同時ゲノム分析のための高通量メソッドである Sperm-seq の開発と応用.
20人の精子提供者からの31,228人のゲメットの分析で,クロスオーバーとアヌプロイド染色体を特定しました.

主要な成果:

分析した精子で813,122のクロスオーバーと787のアヌプロイド染色体が見つかりました.
精子提供者の間で種分裂率の範囲 (0. 01-0. 05) が観察され,交差は部分的にメオシスI非分裂に対する保護を提供した.
単純な非分裂を超えた多様なゲノム異常を検出し,個人と細胞間の再結合フェノタイプ (クロスオーバー率,位置,干渉) の強い共変性を発見した.

結論:

媒介性染色体圧縮の変動性は,媒介性現象型における個体間および細胞間差異を駆動する主要なメカニズムである.
発見は,ミオシス中のヒトのアヌプロイドと遺伝的変化の源について洞察を与えます.
精子配列は単細胞レベルで複雑なメオティックなプロセスを解剖する強力なツールです

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