In:
Journal of Molecular Medicine, Springer Science and Business Media LLC, Vol. 100, No. 12 ( 2022-12), p. 1741-1754
Abstract:
RBM20 is one of the genes predisposing to dilated cardiomyopathy (DCM). Variants in the RS domain have been reported in many DCM patients, but the pathogenicity of variants within the RNA-recognition motif remains unknown. Two human patients with the I536T- RBM20 variant without an apparent DCM phenotype were identified in sudden death cohorts. A splicing reporter assay was performed, and an I538T knock-in mouse model ( Rbm20 I538T ) was generated to determine the significance of this variant. The reporter assay demonstrated that the human I536T variant affected the TTN splicing pattern compared to wild-type. In the mouse experiments, Rbm20 I538T mice showed different splicing patterns in Ttn , Ldb3 , Camk2d , and Ryr2 . The expressions of Casq1 , Mybpc2 , and Myot were upregulated in Rbm20 I538T mice, but Rbm20 I538T mice showed neither DCM nor cardiac dysfunction on histopathological examination and ultrasound echocardiography. The I536T- RBM20 (I538T- Rbm20 ) variant changes gene splicing and affects gene expression, but the splicing and expression changes in Ttn and Ca handling genes such as Casq1 , Camk2d , and Ryr2 do not cause DCM morphology in the mouse model. Key messages • Two human patients with the I536T- RBM20 variant without a DCM phenotype were identified. • A splicing reporter assay demonstrated that the variant affected the TTN splicing. • Rbm20 I538T mice showed neither DCM nor cardiac dysfunction. • Rbm20 I538T mice showed different splicing patterns and the gene expressions.
Type of Medium:
Online Resource
ISSN:
0946-2716
,
1432-1440
DOI:
10.1007/s00109-022-02262-8
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2022
detail.hit.zdb_id:
1462132-0
SSG:
12
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