Skeletal Muscle Pathology in X-Linked Myotubular Myopathy: Review With Cross-Species Comparisons

Area of Science:

• Genetics
• Molecular Biology
• Neuromuscular Disorders

Background:

• X-linked myotubular myopathy (XLMTM) is a rare congenital myopathy caused by MTM1 gene mutations, leading to myotubularin deficiency and severe weakness.
• Myotubularin plays critical roles in cellular processes including endosomal trafficking, muscle contraction, and neuromuscular junction integrity.

Purpose of the Study:

• To review and compare published animal models of XLMTM.
• To analyze the pathological features of these models in relation to human XLMTM.
• To assess the utility of animal models for preclinical research and therapeutic translation.

Main Methods:

• Review of published literature on XLMTM animal models (zebrafish, mice, dogs).
• Comparative analysis of pathological findings in animal models versus human patients.
• Evaluation of disease severity and recapitulation of human XLMTM features.

Main Results:

• Vertebrate models exhibit variable severity, reflecting different levels of myotubularin deficiency.
• Models recapitulate key pathological aspects of human XLMTM, including muscle weakness and cellular dysfunction.
• Specific models show promise in mirroring distinct facets of the human disease.

Conclusions:

• Animal models are crucial for understanding XLMTM pathogenesis and evaluating therapeutic strategies.
• Translating preclinical findings from animal models to human clinical studies requires careful consideration of pathological endpoint correlations.
• Further research utilizing these models will facilitate the development of effective treatments for XLMTM.