Efforts to understand the function of dystrophin, the protein product
for the Duchenne muscular dystrophy gene, resulted in the purification
of the dystrophin-glycoprotein complex. Over the past year several no
vel components of this complex have been identified. Recent studies ha
ve extended the number of muscular dystrophies associated with the oli
gomeric complex to six genetically distinct diseases, including three
new forms of limb-girdle muscular dystrophy and one form of congenital
muscular dystrophy.