X-linked recessive myotubular myopathy with MTM1 mutations

Area of Science:

• Genetics
• Neuromuscular Disorders
• Pediatrics

Background:

• X-linked myotubular myopathy (XLMTM) is a severe congenital muscle disorder.
• Caused by mutations in the MTM1 gene, it presents with profound hypotonia and muscle weakness in males.
• XLMTM is often fatal in early infancy, necessitating accurate and timely diagnosis.

Purpose of the Study:

• To report a case of a neonate diagnosed with XLMTM.
• To highlight the diagnostic process involving clinical evaluation, muscle biopsy, and genetic testing.
• To confirm the specific MTM1 gene mutation and its familial transmission.

Main Methods:

• Clinical assessment of a neonate with severe hypotonia and respiratory distress.
• Histopathological examination of muscle biopsy samples.
• Genetic analysis to identify mutations in the MTM1 gene.

Main Results:

• Muscle biopsy revealed characteristic features of myopathy, including fiber size variability and central nuclei.
• Genetic testing identified a novel MTM1 gene mutation (c.1261-1C>A) in the affected neonate.
• The same MTM1 mutation was detected in the patient's mother, indicating carrier status.

Conclusions:

• The study confirms a diagnosis of XLMTM in a neonate based on clinical, histological, and genetic findings.
• The identified MTM1 mutation provides further insight into the genetic basis of XLMTM.
• This case underscores the importance of genetic testing in diagnosing congenital myopathies and understanding their inheritance patterns.