Abstract
Mutations in the FHL1 gene can be associated with a variety of X-linked myopathies and cardiomyopathies, among which X-linked dominant scapuloperoneal myopathy is a rare phenotype. We collected the clinical data of two unrelated Chinese patients with X-linked scapuloperoneal myopathy and analyzed their clinical, pathological, muscle imaging, and genetic features. Both patients were characterized by scapular winging, bilateral Achilles tendon contractures, and weakness in shoulder-girdle and peroneal muscles. Muscle biopsy revealed myopathic changes, and no reducing bodies were found. Muscle magnetic resonance imaging was dominated by fatty infiltration, with minor edema-like findings. Genetic analysis revealed two novel mutations in the FHL1 gene: c.380T > C (p.F127S) and c.802C > T (p.Q268*), which were located in the LIM2 domain and the C-terminal sequence, respectively. To our knowledge, this is the first report of X-linked scapuloperoneal myopathy in the Chinese population. Our findings broadened the genetic and ethnic spectrum of FHL1-related disorders and proposed to look for variants in the FHL1 gene when scapuloperoneal myopathy is observed in the clinical work.
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Acknowledgements
We sincere thank patients and their families for their participation.
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This work was supported by the military training injury prevention research mission (21XLS28).
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Study conception and design: YL. Manuscript preparation: YL. Data acquisition: YL, RB, LQ, JC, ML, and JL. Critical review of the intellectual content: RB. Critical and important advice on the whole research conduction: QS.
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The patient has provided consent for the use of the clinical information. This study has been approved by the Chinese PLA General Hospital Ethical Review Committee and has therefore been performed following the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.
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Lin, Y., Ban, R., Qiao, L. et al. Identification of novel FHL1 mutations associated with X-linked scapuloperoneal myopathy in unrelated Chinese patients. J Hum Genet 68, 477–484 (2023). https://doi.org/10.1038/s10038-023-01138-0
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DOI: https://doi.org/10.1038/s10038-023-01138-0