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Identification of Two Novel LAMP2 Gene Mutations in Danon Disease
- Source :
- Canadian Journal of Cardiology. 32:1355.e23-1355.e30
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- Background Danon disease is a rare X-linked inherited disorder characterized by massive left ventricular hypertrophy, skeletal muscle dystrophy, and mental retardation. The disease is caused by mutations in the LAMP2 gene encoding for lysosome-associated membrane protein-2. Methods Two young male patients with hypertrophic cardiomyopathy, characterized by marked, concentric left ventricular hypertrophy, elevated levels of creatine kinase, and manifest limb-girdle muscular dystrophy in 1 case, were investigated. Genetic screening included direct sequencing of the whole coding sequence of the LAMP2 gene. Results Genetic analysis identified 2 novel LAMP2 gene mutations. In Family A, a G-A transition (c.962G > A) leading to a nonsense mutation at codon 321 (p.Trp321Ter), and in Family B, a one-nucleotide insertion (c.973insC) leading to a full frame-shift (p.Pro324+24X) was detected in exon 8 of the LAMP2 gene. Family screening identified 8 mutation carriers, with 4 nonpenetrant cases and 3 additional, probably affected family members without DNA diagnosis. The cardiac phenotype was hypertrophic cardiomyopathy in all cases, including female mutation carriers. Five disease-related deaths occurred in the families, at an average age of 33 ± 16 years, which was clearly lower in male than in female patients (28 ± 7 vs 42 ± 25 years). A high prevalence of arrhythmias or conduction abnormalities was also observed. Conclusions The reported 2 novel LAMP2 gene mutation carrier families, one of them being one of the largest reported to date, highlight the malignant clinical course of Danon disease, characterized by a high rate of disease-related death at an early age and a high prevalence of arrhythmias or conduction abnormalities.
- Subjects :
- Male
Pathology
medicine.medical_specialty
Nonsense mutation
Cardiomyopathy
030204 cardiovascular system & hematology
Gene mutation
Frameshift mutation
Young Adult
03 medical and health sciences
0302 clinical medicine
Lysosomal-Associated Membrane Protein 2
Cardiomyopathy, Hypertrophic, Familial
medicine
Humans
Danon disease
Muscular dystrophy
Frameshift Mutation
LAMP2
business.industry
Genetic Carrier Screening
Hypertrophic cardiomyopathy
Arrhythmias, Cardiac
medicine.disease
Glycogen Storage Disease Type IIb
Pedigree
Codon, Nonsense
Female
Cardiology and Cardiovascular Medicine
business
030217 neurology & neurosurgery
Subjects
Details
- ISSN :
- 0828282X
- Volume :
- 32
- Database :
- OpenAIRE
- Journal :
- Canadian Journal of Cardiology
- Accession number :
- edsair.doi.dedup.....42915655e0568e75cc8eedfb6a1b6980