LAMA2 and congenital muscular dystrophy: The most common form worldwide is considered to be merosin-deficient muscle dystrophy type 1A, called MDC1A (due to laminin-α2 defects), accounting for 30-40% of total cases of CMD, although in some geographical regions other forms are prevalent, such as Fukuyama CMD in Japan and muscle-eye-brain (MEB) disease in Finland.