congenital merosin-deficient muscular dystrophy 1A (Monarch Disease Ontology identifier MONDO_0011925) is congenital muscular dystrophy type 1A (MCD1A) belongs to a group of neuromuscular disorders with onset at birth or infancy characterized by hypotonia, muscle weakness and muscle wasting. Also known as: CMD1A, LAMA2 congenital muscular dystrophy, MDC1A, congenital merosin-deficient muscular dystrophy type 1A, congenital muscular dystrophy caused by mutation in LAMA2, congenital muscular dystrophy due to laminin alpha2 deficiency, merosin-deficient congenital muscular dystrophy type 1A, merosin-negative congenital muscular dystrophy.