Nemaline myopathy, a rare congenital myopathy, is characterized by generalized muscle weakness, hypotonia, respiratory insufficiency, and the presence of rod structures on muscle biopsy, which is caused by mutations in at least 13 known genes. A patient showing gradually deteriorated proximal muscle weakness and rod-shaped structures found in muscle fibers was suspected of having nemaline myopathy, following by the next-generation sequencing. We report two novel compound heterozygous variants in nebulin gene in a family residing in China. One is an intron event caused by an underlying variant at the + 3 position of the donor site. Another is a novel nonsense variant, which may lead to the end of protein translation and have a significant impact on protein function. The pathogenicity of this novel compound heterozygous variant remains to be verified. Variants reported here could help to diagnose NM for clinicians.
Novel compound heterozygous variants identified in the nebulin gene.
Muscle biopsy showed typical nemaline rods.
Muscle MRI showed muscle involvement typical for nebulin-associated myopathies.
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Our patient’s cooperation is gratefully acknowledged. We are grateful to the Precision Gene for performing the Sanger and NGS sequencing. We thank Wu Cuimei and Wang Rui for performing the muscle biopsies.
Compliance with ethical standards
Conflict of interest
The authors declare no conflicts of interest.
Ethical approval was obtained from the first hospital of ShanXi Medical University Research Ethics Committee.
Informed consent was obtained from all individual participants included in the study.
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