Abstract:
:Cardiac conduction defects decrease life expectancy in myotonic dystrophy type 1 (DM1), a CTG repeat disorder involving misbalance between two RNA binding factors, MBNL1 and CELF1. However, how DM1 condition translates into conduction disorders remains poorly understood. Here we simulated MBNL1 and CELF1 misbalance in the Drosophila heart and performed TU-tagging-based RNAseq of cardiac cells. We detected deregulations of several genes controlling cellular calcium levels, including increased expression of straightjacket/α2δ3, which encodes a regulatory subunit of a voltage-gated calcium channel. Straightjacket overexpression in the fly heart leads to asynchronous heartbeat, a hallmark of abnormal 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. These findings suggest that reducing ventricular straightjacket/α2δ3 levels could offer a strategy to prevent conduction defects in DM1.
journal_name
Elifejournal_title
eLifeauthors
Auxerre-Plantié E,Nakamori M,Renaud Y,Huguet A,Choquet C,Dondi C,Miquerol L,Takahashi MP,Gourdon G,Junion G,Jagla T,Zmojdzian M,Jagla Kdoi
10.7554/eLife.51114subject
Has Abstractpub_date
2019-12-12 00:00:00issn
2050-084Xpii
51114journal_volume
8pub_type
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