Congenital myopathies.

Area of Science:

• Neurology
• Genetics
• Muscle Biology

Background:

• Congenital myopathies are inherited neuromuscular disorders presenting with hypotonia and weakness from birth.
• Historically classified by muscle biopsy morphology (nemaline, central core, centronuclear, congenital fiber type disproportion).

Approach:

• Elucidation of genetic underpinnings over the past two decades.
• Integration of histological and genetic findings for improved diagnostic correlation.

Key Points:

• Genetic heterogeneity: Multiple genes can cause similar pathologies.
• Phenotypic variability: Single genes can lead to diverse muscle pathologies.
• Age- and family-dependent expression: Same mutations may manifest differently across individuals and ages.

Conclusions:

• Traditional classification is challenged by complex genotype-phenotype correlations.
• Genetic sequencing (exome, genome) is becoming the primary diagnostic tool.
• A clinical overview and genetic guide are crucial for managing congenital myopathies.