アフリカの集団で皮膚の色素化に関連した局所
Nicholas G Crawford1, Derek E Kelly1,2, Matthew E B Hansen1
1Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
まとめ
研究者は,ヒトの皮膚の色素の多様性に関連した重要な遺伝子 (SLC24A5,MFSD12,DDB1,TMEM138,OCA2,HERC2) を特定しました. 遺伝分析により 染色体の特徴に影響を与える 遺伝子の流れと共通の祖先が明らかになりました
科学分野:
- 人間 の 遺伝子
- 人口ゲノミクス
- 皮膚科
背景:
- 人間の皮膚の色素は,世界的に顕著な多様性を表しています.
- この多様性の遺伝的基盤は,特にアフリカの多様な集団では,まだ完全に理解されていません.
- 以前の研究で,色素化に関連したいくつかの場所が特定されましたが,民族的に多様なグループにわたる包括的な分析が必要です.
研究 の 目的:
- 皮膚の色素化に関連した遺伝的変異を特定する.
- 染色に関連した遺伝子の進化史と集団遺伝子を調査する.
- メラノゲネシスと紫外線反応における 特定された遺伝子の機能的役割を探求する.
主な方法:
- アフリカの多様な集団における全ゲノム関連研究 (GWAS).
- SLC24A5,MFSD12,DDB1,TMEM138,OCA2,HERC2を含む候補遺伝子の遺伝子変異の分析
- 遺伝子フローと祖先を推論する 系統遺伝分析と集団遺伝学の方法
- モデル生物 (ゼブラ魚,マウス) の機能研究と規制領域の分析.
主要な成果:
- SLC24A5,MFSD12,DDB1,TMEM138,OCA2,HERC2の変異と皮膚の色素との間に重要な関連が確認された.
- 証拠によると,SLC24A5の軽い色素の変種は,非アフリカの遺伝子フローを通じて東アフリカに導入されました.
- アフリカ人の黒い色素に繋がる変種は,南アジアやオーストラリア・メラネジアの集団と 血統的に共通している.
- MFSD12はメラノゲネシスに影響を与えるリソソームタンパク質をコードすることが判明しました.
- DDB1/TMEM138に近い変異は,ユーラシア人の選択中のUV反応遺伝子発現と相関する.
結論:
- SLC24A5とMFSD12を含む複数の遺伝子は,人間の皮膚の色素の多様性を決定する上で重要な役割を果たしています.
- 遺伝子フローと選択を含む集団特有の進化史は,世界的に色素化パターンを形成しています.
- 機能的研究では,MFSD12がメラノゲネシスにおける重要性と,UV適応におけるDDB1/TMEM138の近くの規制要素が強調されています.
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