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- W2893769820 abstract "ABSTRACT Cardiac conduction defects decrease life expectancy in myotonic dystrophy type 1 (DM1), a complex toxic CTG repeat disorder involving misbalance between two RNA- binding factors, MBNL1 and CELF1. How this pathogenic DM1 condition translates into cardiac conduction disorders remains poorly understood. Here, we simulated MBNL1 and CELF1 misbalance in the Drosophila heart and identified associated gene deregulations using TU-tagging based transcriptional profiling of cardiac cells. We detected deregulations of several genes controlling cellular calcium levels and among them increased expression of straightjacket/α2δ3 that encodes a regulatory subunit of a voltage-gated calcium channel. Straightjacket overexpression in the fly heart leads to asynchronous heart beating, a hallmark of affected conduction, whereas cardiac straightjacket knockdown improves these symptoms in DM1 fly models. We also show that ventricular α2δ3 expression is low in healthy mice and humans but significantly elevated in ventricular muscles from DM1 patients with conduction defects. Taken together, this suggests that reducing the straightjacket/α2δ3 transcript levels in ventricular cardiomyocytes could represent a strategy to prevent conduction defects and in particular intraventricular conduction delay associated with DM1 pathology." @default.
- W2893769820 created "2018-10-05" @default.
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- W2893769820 date "2018-10-02" @default.
- W2893769820 modified "2023-10-14" @default.
- W2893769820 title "<i>Straightjacket/α2δ3</i>deregulation is associated with cardiac conduction defects in Myotonic Dystrophy type 1" @default.
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- W2893769820 doi "https://doi.org/10.1101/431569" @default.
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