The Combined Human Genotype of Truncating TTN and RBM20 Mutations Is Associated with Severe and Early Onset of Dilated Cardiomyopathy.

The Combined Human Genotype of Truncating TTN and RBM20 Mutations Is Associated with Severe and Early Onset of Dilated Cardiomyopathy.
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DOI:
10.3390/genes12060883
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发表时间:
2021-06-08
期刊:
影响因子:
3.5
通讯作者:
Milting H
Milting H
中科院分区:
生物学3区
文献类型:
--
作者:
Gaertner A;Bloebaum J;Brodehl A;Klauke B;Sielemann K;Kassner A;Fox H;Morshuis M;Tiesmeier J;Schulz U;Knoell R;Gummert J;Milting H

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心力衰竭的主要原因是心肌病,其中扩张型心肌病(DCM)是最常见的形式。超过40个基因与DCM相关,其中包括TTN和RBM20。临床DCM队列中的下一代测序显示TTN(TTNtv)中的截短变体,占家族性DCM病例的25%。心脏剪接因子RNA结合基序蛋白20(RBM20)的突变也已知与严重心肌病相关。TTN是主要的RBM20剪接靶点之一。大多数致病性RBM20突变位于高度保守的富含精氨酸丝氨酸的结构域(RS),导致突变型RBM20的细胞质错误定位。在这里,我们提出了一个早发DCM携带(可能)致病TTN和RBM20突变的组合患者。我们发现RBM20靶基因的剪接在突变携带者中受到影响。此外,我们揭示了RBM20单倍不足可能是由RBM20中的移码突变引起的。
A major cause of heart failure is cardiomyopathies, with dilated cardiomyopathy (DCM) as the most common form. Over 40 genes are linked to DCM, among them TTN and RBM20. Next Generation Sequencing in clinical DCM cohorts revealed truncating variants in TTN (TTNtv), accounting for up to 25% of familial DCM cases. Mutations in the cardiac splicing factor RNA binding motif protein 20 (RBM20) are also known to be associated with severe cardiomyopathies. TTN is one of the major RBM20 splicing targets. Most of the pathogenic RBM20 mutations are localized in the highly conserved arginine serine rich domain (RS), leading to a cytoplasmic mislocalization of mutant RBM20. Here, we present a patient with an early onset DCM carrying a combination of (likely) pathogenic TTN and RBM20 mutations. We show that the splicing of RBM20 target genes is affected in the mutation carrier. Furthermore, we reveal RBM20 haploinsufficiency presumably caused by the frameshift mutation in RBM20.
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