Open AccessA case of congenital fiber‐type disproportion syndrome presenting dilated cardiomyopathy with ACTA1 mutation
Author(s) -
Matsumoto Ayumi,
Tsuda Hidetoshi,
Furui Sadahiro,
KawadaNagashima Masako,
Anzai Tatsuya,
Seki Mitsuru,
Watanabe Kazuhisa,
Muramatsu Kazuhiro,
Osaka Hitoshi,
Iwamoto Sadahiko,
Nishino Ichizo,
Yamagata Takanori
Publication year - 2022
Publication title -
molecular genetics and genomic medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 29
ISSN - 2324-9269
DOI - 10.1002/mgg3.2008
Subject(s) - mutation , transfection , actin , cardiomyopathy , exome sequencing , biology , cytoplasm , atrophy , dilated cardiomyopathy , genetics , medicine , gene , heart failure
Background Actin, alpha, skeletal muscle 1 ( ACTA1 ) is one of the causative genes of nemaline myopathy (NM) and congenital fiber‐type disproportion (CFTD). CFTD is characterized by type 1 fiber atrophy and distinguished from NM in the absence of rods. Eight patients with CFTD, including one patient with dilated cardiomyopathy (DCM), have previously been reported. Herein, we report the case of a 10‐year‐old boy presenting with CFTD and DCM. Methods We performed exome sequencing and analyzed the effect of Met327Lys mutations on cultured C2C12 muscle cells compared with that seen in the wild type (WT, ACTA1) and previously identified Asp294Val mutations associated with a severe phenotype of CFTD without cardiomyopathy. Results Exome sequencing revealed a de novo mutation, c.980 T > A, p.(Met327Lys), in ACTA1 (NM_001100.4). C2C12 cells transfected with the WT plasmid expressed ACTA1 in the nucleus and cytoplasm. Cells with the Asp294Val mutant showed needle‐like structures in the cytoplasm, whereas the expression of the Met327Lys mutant resulted in few aggregations but many apoptotic cells. Conclusion Apoptosis induced in Met327Lys‐transfected muscle cells supports the pathogenicity of the mutation and can be implicated as one of the histopathological features associated with CFTD, as in NM.