拡張性心筋疾患におけるデスミン変異の有病率
Matthew R G Taylor1, Dobromir Slavov, Lisa Ku
1University of Colorado at Denver and Health Sciences Center, Denver, Colo, USA. Matthew.Taylor@UCHSC.edu
Circulation
|February 28, 2007
まとめ
デスミン遺伝子 (DES) 変異は,骨格筋疾患がない場合でも,拡張性心筋病 (DCM) 症例の1~2%で発見されています. 1Aと2Bドメインの両方の変異はDCMを引き起こすことができ,いくつかの変異はdesminネットワークにそれほど深刻ではない影響を与える.
科学分野:
- 心血管遺伝学 心血管遺伝学
- 筋肉の病気 筋肉の病気
- 分子生物学は分子生物学である.
背景:
- デスミン関連ミオフィブリラーミオパシー (DRM) は,デスミン (DES) 遺伝子の変異により,心臓および骨格筋に影響を与える遺伝疾患です.
- DES2Bドメインの変異は,通常,心臓の問題を起こす前に,骨格筋の問題を引き起こします.
- 前回の骨格筋疾患のない拡張性心筋症 (DCM) 患者におけるDES変異の頻度は,特徴づけられていないままである.
研究 の 目的:
- DCMと診断された個体におけるDES変異の有病率を決定する.
- 心臓細胞におけるdesminネットワークアーキテクチャに対する新しいDES変異の影響を調査する.
主な方法:
- DCM患者コホートにおけるデナチュレーション性高性能液体クロマトグラフィーを用いてDES遺伝子の変異のスクリーニング.
- 特定されたDES変異を細胞モデル (SW13,滑らかな筋肉細胞,新生児ラット心筋細胞) に変異させる.
- コンフォカル顕微鏡を用いたデスミンタンパク質の局所化と細胞骨格ネットワーク形成の分析.
主要な成果:
- 5つの新しいミスセンスのDES変異は,DCM被験者425人中6人 (有病率1.4%) で特定されました.
- DES 2Bドメインの変異は,細胞質の中でデズミンタンパク質の重要な破壊と凝集を引き起こしました.
- 尾領域変異 (Val459Ile) は,desminネットワークにより軽度の効果を示し,主に黒人個体において低浸透性変異であるように見えた.
結論:
- DES変異はDCM症例の1~2%を占め,1Aと2Bドメインの両方の変異が病原性である.
- 病原性デスミン変異は,看似完ぺきなデスミンネットワーク構造,特に1Aとテールドメインにあるものであっても,DCMにつながる可能性があります.
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