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LAMP2 microdeletions in patients with Danon disease
Zhao Yang1, Birgit H Funke, Linda H Cripe
1Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, Houston, USA.
Danon disease, a rare genetic disorder, can be caused by large microdeletions in the LAMP2 gene. These deletions disrupt LAMP2 protein function, leading to severe symptoms in affected individuals.
Area of Science:
- Genetics
- Molecular Biology
- Rare Diseases
Background:
- Danon disease is an X-linked dominant disorder.
- Characterized by hypertrophic cardiomyopathy, skeletal myopathy, and mental retardation.
- Associated with mutations in the lysosome-associated membrane glycoprotein 2 (LAMP2) gene.
Observation:
- Analyzed 3 male cases with clinical and pathological findings of Danon disease.
- Comprehensive mutational analysis of LAMP2 gene revealed suspected genomic DNA deletions.
- Identified novel microdeletions in the LAMP2 gene using various PCR and Southern blot techniques.
Findings:
- A 34-kb microdeletion encompassing the 5'-untranslated region and exon 1 of LAMP2 was identified in one case.
- 64-kb and 58-kb deletions, ablating exons 4 to 10, were found in two other cases.
- Confirmed absence of LAMP2 protein in affected individuals.
Implications:
- This study reports the first cases of Danon disease caused by microdeletions at Xq24.
- The identified microdeletions functionally ablate LAMP2.
- The mechanism involves Alu-mediated unequal recombination and chromosomal breakage points in TA-rich repeats.
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