Danon disease due to a novel splice mutation in the LAMP2 gene.

Danon disease is a rare X-linked dominant disorder caused by lysosomal-associated membrane protein 2 (LAMP2) deficiency and is characterized by hypertrophic cardiomyopathy, cardiac conduction abnormalities, skeletal vacuolar myopathy, variable degree of mental retardation, and peripheral pigmentary retinopathy. We describe a novel splice mutation in the LAMP2 gene in a French Canadian family. By identifying this novel mutation we were able to offer genetic screening and counseling to all family members. Presymptomatic diagnosis is important as cardiac surveillance can be life-saving.