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Pediatrics - Cardiology

Houston, Texas

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Pediatrics - Cardiology
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CAV3 Mutation Analysis

Caveolin-3 (CAV3) gene is composed of two exons and is located at 3p25. It encodes a caveolin family member, which functions as a component of the caveolae plasma membranes found in most cell types. Caveolin proteins are proposed to be scaffolding proteins for organizing and concentrating certain caveolin-interacting molecules. However, multiple other functions of these proteins have been described or postulated. Mutations identified in this gene lead to interference with protein oligomerization or intra-cellular routing, disrupting caveolae formation and resulting in caveolinopathies, a group of muscle diseases including Limb-Girdle muscular dystrophy type-1C (LGMD1C), hyperCKemia (HCK), rippling muscle disease (RMD), distal myopathy (DM), and hypertrophic cardiomyopathy (HCM) without skeletal muscle manifestations. CAV3 mutations have also been identified in patients with long QT syndrome and sudden infant death syndrome. Mutations in CAV3 have been noted to demonstrate both autosomal dominant and recessive inheritance with a variable clinical expression. Definitive genotype/phenotype correlations have not been described.

Colocalization of CAV3 and hNav1.5 in Human Myocardium

The John Welsh Cardiovascular Diagnostic Laboratory offers molecular genetic testing for CAV3 mutations. Individuals are tested by automatic fluorescent DNA sequencing of all two exons of the CAV3 gene. Genetic counseling is recommended for all individuals in order to identify additional at-risk family members and to discuss reproductive issues.

Reasons for Referral

  • Molecular confirmation of the diagnosis of caveolinopathies, including Limb-Girdle muscular dystrophy type-1C (LGMD1C), hyperCKemia (HCK), rippling muscle disease (RMD), distal myopathy (DM) and hypertrophic cardiomyopathy (HCM) without skeletal muscle manifestations.
  • Molecular confirmation of the diagnosis of CAV3-related long QT syndrome and sudden infant death syndrome.

Methodology

Genomic DNA is analyzed for CAV3 mutations by automatic fluorescent DNA sequencing of all two exons of the CAV3 gene, as well as the exon/intron junctions and a portion of the 5` and 3` untranslated regions. Patient DNA is sequenced in both the forward and reverse orientations. If a mutation is identified, additional family members are analyzed only for the familial mutation(s) by automatic fluorescent DNA sequencing.

Service Fees

Service Direct and Institutional Billing CPT Codes
Index Case (Male or Female) $450 per sample 81404, G0452
Additional Family Members $300 per sample; known familial mutation only 81403, G0452

Sensitivity

DNA Sequencing Analysis: Approximately 99 percent detection of mutations in exons 1-2 of CAV3.

Specimen Requirements

Blood (preferred): EDTA (purple-top) tubes: Adult: 5 cc, Child: 5 cc,Infant: 2-3 cc
Tissue: Frozen (preferred), RNAlater, Formalin-fixed, Paraffin-embedded
Other Body Fluids: Call to inquire
Buccal Swabs: One swab from each cheek

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