Morphologic and clinical aspects of Danon disease in a patient with a mutation c.137G > A in the LAMP-2 gene.

Abstract:

BACKGROUND:Danon disease is caused by a primary deficiency of lysosome-associated membrane protein-2 (LAMP-2). MATERIALS AND METHODS:Our study describes a 19-year-old man with isolated hypertrophic cardiomyopathy, in whom we performed DNA analysis and compared results of microscopic analysis of skeletal and cardiac muscles. RESULTS:Sequencing of the LAMP-2 gene revealed a novel point mutation c.137G > A in exon 2, leading to premature stop codon. Ultrastructural analysis of cardiac and skeletal muscles revealed the presence of unusual autophagic vacuoles in both. Although some vacuoles in skeletal muscle reacted strongly with dystrophin, β-sarcoglycan, and laminin, those in cardiomyocytes showed no immunoreactivity. CONCLUSION:Our immunohistochemical and ultrastructural findings reinforce the claim that in Danon disease the pathomechanism of chaperone-mediated autophagy in cardiomyocytes differs from that in skeletal muscle.

journal_name

Neuropediatrics

journal_title

Neuropediatrics

authors

Fidzianska A,Madej-Pilarczyk A,Walczak E,Kuch M

doi

10.1055/s-0033-1336017

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

276-80

issue

5

eissn

0174-304X

issn

1439-1899

journal_volume

44

pub_type

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