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Phenotype variability and natural history of X-linked myopathy with excessive autophagy

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Abstract

Objective

X-linked myopathy with excessive autophagy (XMEA) linked to the VMA21 gene leads to autophagy failure with progressive vacuolation and atrophy of skeletal muscles. Current knowledge of this rare disease is limited. Our objective was to define the clinical, radiological, and natural history of XMEA.

Methods

We conducted a retrospective study collecting clinical, genetic, muscle imaging, and biopsy data of XMEA patients followed in France and reviewed the literature for additional cases.

Results

Eighteen males had genetically confirmed XMEA in France, carrying four different VMA21 variants. Mean age at disease onset was 9.4 ± 9.9 (range 1–40) years. In 14/18 patients (77.8%), onset occurred during childhood (< 15 years); however in four patients, the disease started in adulthood. Patients had anterior and medial compartment thigh muscle weakness, distal contractures (56.3%), elevated CK levels (1287.9 ± 757.8 U/l) and autophagic vacuoles with sarcolemmal features on muscle histopathology. Muscle MRI (n = 10) showed a characteristic pattern of lower limb muscle involvement. In 11 patients, outcome measures were available for an average follow-up period of 10.6 ± 9.8 years and six of them show disease progression. Mean change of functional outcomes was 0.5 ± 1.2 points for Brooke and 2.2 ± 2.5 points for Vignos score, 7/16 patients (43.8%) needed a walking aid and 3/16 (18.8%) were wheelchair-bound (median age of 40 years old, range 39–48). The variant c.164-7 T > G was associated with a later onset of symptoms. Respiratory insufficiency was common (57.1%) but cardiac involvement rare (12.5%).

Interpretation

XMEA has variable age of onset, but a characteristic clinical, histopathological, and muscle imaging presentation, guiding the diagnosis. Although slowly, motor disability progresses with time, and relevant genotype–phenotype correlations will help design future clinical trials.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors would like to thank Frédéric Fer for assistance with developing the R code to generate a heatmap of the MRI muscle involvement.

The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors. MS is supported by a clinician scientist INSERM position (CIHU INSERM).

Funding

The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors. MS is supported by a clinician scientist INSERM position (CIHU INSERM).

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Authors

Contributions

Concept and design: GFE, AB, TS. Acquisition and analysis of data: GFE, GA, MS, IAB, FD, GS, FC, SM, YP, AM, AP, ESC, BC, SG, MK, VB, TE. Drafting of the manuscript and figures: GFE, GA, MS, AB, CM, TS.

Corresponding author

Correspondence to Gorka Fernández-Eulate.

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The authors declare no conflict of interest.

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Supplementary file1 (DOCX 74 KB)

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Fernández-Eulate, G., Alfieri, G., Spinazzi, M. et al. Phenotype variability and natural history of X-linked myopathy with excessive autophagy. J Neurol (2024). https://doi.org/10.1007/s00415-024-12298-0

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  • DOI: https://doi.org/10.1007/s00415-024-12298-0

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