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Clin Neuropathol. 2012 Jul-Aug;31(4):224-31. doi: 10.5414/NP300465.

Danon disease caused by two novel mutations of the LAMP2 gene: implications for two ends of the clinical spectrum.

Author information

1
Department of Neurology, Peking University First Hospital, Beijing, China.

Abstract

Danon disease is caused by mutations of the lysosome-associated membrane protein-2 (LAMP2) gene at Xq24. Male patients usually manifested as severe cardiomyopathy, mild myopathy and mental retardation. We describe two patients: the first patient presented with severe hypertrophic cardiomyopathy, Wolff-Parkinson-White syndrome, proximal muscle weakness, and chronic painless diarrhea; the second patient manifested as limb-girdle muscle weakness, mild left ventricular diastolic dysfunction, sub-clinical neuropathy. Muscle biopsies indicated autophagic vacuolar myopathy. Immunologic analysis demonstrated absence of the LAMP2 protein in the first patient, while a smear of expression was detected in the second patient. Two nonsense mutations (p.E298X and p. K402X) were identified in the two cases, respectively located in exon 7 and exon 9B of the LAMP2 gene. Our findings indicated that patients with Danon disease caused by mutations in exon 1 – 8 manifested as a typically severe phenotype, while patients with mutations in exon 9 of the LAMP2B isoform presented with a relatively benign phenotype.

PMID:
22541782
DOI:
10.5414/NP300465
[Indexed for MEDLINE]

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