ABSTRACT Limb girdle muscular dystrophy (LGMD) is a heterogeneous
genetically determined group of skeletal muscle disorders. Among
the 24 reported subtypes of LGMD, limb- girdle muscular dystrophy
type 2A (LGMD2A) is caused by mutations in the calpain 3 (CAPN3)
gene. In Pakistan, consanguineous marriages are common due to
social, ethnic and traditional customs which is a leading cause of
calpainopathy. In the present study, two families (A, B) showing
clinically distinct autosomal recessive limb girdle muscular
dystrophy type 2A were evaluated genetically. Any other abnormality
was not observed in both families. Technique of homozygosity
mapping was used to track the gene responsible for autosomal
recessive LGMD2A in both families. In homozygosity mapping with
polymorphic microsatellite markers, linkage in family A and B with
LGMD2A was established to CAPN3 gene on chromosome 15q15.1-q21.1.
Subsequently, sequence analysis of all 24 exons of CAPN3 was
performed but no disease causing DNA sequence variant was found in
these exons suggesting the presence of mutation in the regulatory
sequences or any other genes present in this region.
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