子宮内胎児死亡における長QT症候群に関連した変異
Lia Crotti1, David J Tester, Wendy M White
1Department of Molecular Medicine, University of Pavia, and Molecular Cardiology Laboratory, Fondazione IRRCCS Policlinico S Matteo, Pavia, Italy.
JAMA
|April 11, 2013
まとめ
遺伝子検査により,説明がつかない死産の3.3%で長QT症候群 (LQTS) 変異が確認されました. この研究は,胎児死亡の遺伝的原因と死産の潜在的なメカニズムについての洞察を提供します.
科学分野:
- 遺伝学 遺伝学とは
- 心臓病学 心臓病学
- ペリナトロジー (Perinatology) とは
背景:
- 死産,または子宮内胎児死亡は,160例の妊娠のうち1例に発生し,すべての胎児死亡の半分を占めています.
- 死後の評価では,死産の原因が特定できないことが多い.
- ロングQTシンドローム (LQTS) は,死産に寄与する潜在的,まだ認識されていない要因です.
研究 の 目的:
- LQTSに関連した3つの最も一般的な遺伝子 (KCNQ1,KCNH2,SCN5A) の突然変異の発生率とスペクトルを調査する.
- 原因不明の死産症例のコホートにおけるこれらの遺伝子変異の役割を決定する.
主な方法:
- 死亡組織から得られたDNAを用いて,解明できない死産症例91件を遡及的に遺伝分析した.
- KCNQ1,KCNH2,およびSCN5A遺伝子の包括的な変異分析.
- ヘテロログの発現とパッチクランプの電気生理学を使用して,特定された変異の機能的評価.
主要な成果:
- 3つのミスセンスの変異 (KCNQ1,p.A283T; KCNQ1,p.R397W; KCNH2 [1b],p.R25W) は,死産児の3.3%で発見され,コントロールでは見られなかった.
- これらの変異は,子宮内のLQTSタイプ1と2に一致する機能喪失を示した.
- 潜在的にプロアリズム的な現象型に関連した希少なSCN5A変異は,さらに5つの症例で特定されました.
結論:
- LQTSの感受性に関連した遺伝的変異は,原因不明の死産の3.3%で特定されました.
- 全体として,8.8%の症例は,LQTSに関連したイオンチャネルが機能不全を引き起こす遺伝的変異を有していた.
- これらの発見は,LQTSの遺伝子変異が,死産の重要な原因であり,診断されていない可能性があることを示唆しています.
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