バリアント・イントロニック・エンハンサー・コントロールSCN10A-ショート 表現と心臓伝導
Joyce C K Man1,2, Fernanda M Bosada1,2, Koen T Scholman1,2
1Department of Medical Biology (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands.
Circulation
|April 29, 2021
まとめ
SCN10Aの遺伝子変異は,心臓特有の短いトランスクリプトを変化させ,心臓リズムに影響します. これはナトリウムチャネル機能に影響し,心房伝導と心拍不良の感受性に影響します.
科学分野:
- 心血管遺伝学
- 分子心臓科
- イオンチャンネル生理学
背景:
- SCN10Aの遺伝子変異は,心房細動やブルガダ症候群のような心律動乱に関連しています.
- SCN10Aとその関連するナトリウムチャネルNaV1. 8の正確な心臓機能は不明である.
- この研究では,心臓のSCN10A発現と制御強化要素の役割が調査されています.
研究 の 目的:
- SCN10Aの心臓発作パターンを決定する
- SCN10Aを調節する変異感性の内定増強剤の機能を明らかにする.
- この増強剤の遺伝的変異が 心臓の機能とリズムに どう影響するか理解するためです
主な方法:
- マウスとヒトの心臓組織におけるSCN10A発現を調査した.
- CRISPR/Cas9を用いて intronic enhancer をマウスで破壊し,その後,トランスクリプトミクスと電気生理学的分析を行った.
- 遺伝子変異を遺伝子発現に結びつけるため,全ゲノム関連研究と発現量的な特性の位置分析を行った.
主要な成果:
- 心臓特異性のある短いSCN10Aトランスクリプト (Scn10a-short) を心房および結節心筋細胞で特定し,内部増強剤プロモーターからトランスクリプトした.
- ネズミの増強剤の作用が妨げられ,Scn10a- shortの発現が低下し,心房伝導が低下し,心律乱れ,ナトリウム電流が変化した.
- Scn10a短表現はNaV1. 5媒介のナトリウム電流を増加させ,Scn5a表現は影響を受けなかった.
結論:
- SCN10Aに近い遺伝子変異は,心臓特異のSCN10A短文字の発現を制御して,強化剤の活性を調節する.
- この非コード変異は,NaV1.5機能と心臓の電気生理学に影響し,不律感受性に影響する.
- この研究では,SCN10Aの変種が心筋細胞におけるNaV1. 8の機能部分の調節によって心拍に影響を与える新しいメカニズムが明らかになりました.
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