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A childhood-onset nemaline myopathy caused by novel heterozygote variants in the nebulin gene with literature review

  • Qi Wen
  • Xueli ChangEmail author
  • Junhong GuoEmail author
Original article
  • 12 Downloads

Abstract

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.

Article Highlights

  • 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.

Keywords

Childhood-onset nemaline myopathy Novel compound heterozygote Nebulin gene 

Notes

Acknowledgements

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.

Funding

None.

Compliance with ethical standards

Conflict of interest

The authors declare no conflicts of interest.

Ethical approval

Ethical approval was obtained from the first hospital of ShanXi Medical University Research Ethics Committee.

Informed consent

Informed consent was obtained from all individual participants included in the study.

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Copyright information

© Belgian Neurological Society 2019

Authors and Affiliations

  1. 1.Department of Neurology, First HospitalShanxi Medical UniversityTaiyuanPeople’s Republic of China

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