Severe neonatal centronuclear myopathy with autosomal dominant inheritance

Area of Science:

• Genetics
• Neurology
• Pediatrics

Background:

• Centronuclear myopathy (CNM) is a group of inherited muscle disorders.
• Severe infantile forms of CNM are typically associated with recessive inheritance patterns.

Observation:

• A family presented with a severe infantile centronuclear myopathy (CNM) case in a boy.
• The boy's mother exhibited clinical, electrophysiological, and pathological signs of skeletal muscle, peripheral nerve, and brain-stem disorder.
• The patient's brother had similar symptoms and died in early infancy.

Findings:

• The mother's condition is believed to be a variant of her son's severe infantile CNM.
• The family's presentation suggests autosomal dominant inheritance with variable expressivity for severe CNM.
• This inheritance pattern is novel for severe, fatal infantile CNM.

Implications:

• The findings suggest a single gene may cause alterations in muscle and nerve maturation, leading to varied disease severity.
• This expands the known genetic basis and inheritance patterns of centronuclear myopathies.
• Further research into the genetic mechanisms underlying variable expressivity in CNM is warranted.