ヒトの脳進化の細胞の複雑さを駆動する分子特性
Emre Caglayan1,2, Fatma Ayhan1,2, Yuxiang Liu1,2
1Department of Neuroscience, UT Southwestern Medical Center, Dallas, TX, USA.
Nature
|July 19, 2023
まとめ
人間の脳の進化には 独特のゲノム変化が伴います この研究はヒトと霊長類の細胞タイプ特有の 分子と規制の違いを明らかにし 人間の脳のイノベーションのメカニズムを明らかにしています
科学分野:
- 進化生物学
- 神経科学
- ゲノミクス
背景:
- ヒト特有のゲノム変異が 独特の脳の機能を支えています
- 細胞の多様性と複雑な遺伝子調節は,ヒト特有の分子特性の細胞解像度分析を必要とします.
研究 の 目的:
- 細胞解像度で脳内のヒト特有の分子および調節特性を特徴づける.
- ヒトの脳の進化に寄与するゲノム領域と規制メカニズムを特定する.
主な方法:
- 単核RNA配列解析 (snRNA-seq) と,配列解析 (snATAC-seq) のデータによるトランポゼーゼアクセス可能なクロマチンの単核解析.
- 人間,チンパンジー, rhesus macaque (後帯状皮質) の脳組織を比較した分析.
主要な成果:
- オリゴデンドロサイト集団におけるヒト特有の変化 (先駆体増加,成熟細胞減少) を観察した.
- FOXP2のアップレギュレーションを含む,オリゴデンドロサイト原始細胞とニューロンのサブタイプにおける加速されたヒト特異的な調節変化を特定した.
- 刺激性ニューロンのFOS::JUNとFOXモチーフに富んだ,染色体のアクセシビリティが変化した数百のヒト加速ゲノム領域 (HAR) を発見した.
結論:
- 細胞型に特化した新種の 分子と制御メカニズムが 人間の脳の進化を駆動しています
- オリゴデンドロ細胞の発達とヒトの神経革新における特異的な転写因子の役割を強調する.
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