Dihydropyridine Receptor Congenital Myopathy In A Consangineous Turkish Family

Area of Science:

• Neurology
• Genetics
• Rare Diseases

Background:

• Dihydropyridine receptor congenital myopathy is a rare neuromuscular disorder.
• It is associated with mutations in the CACNA1S gene.
• Only a limited number of cases have been previously reported.

Purpose of the Study:

• To describe a novel homozygous mutation in the CACNA1S gene.
• To expand the known phenotypic spectrum of dihydropyridine receptor congenital myopathy.
• To highlight the utility of whole exome sequencing in diagnosing early-onset neuromuscular disorders.

Main Methods:

• Genetic analysis of a consanguineous family with three affected children.
• Whole exome sequencing to identify the causative mutation.
• Clinical and neurological examination of affected individuals.

Main Results:

• Identification of a novel homozygous mutation in the CACNA1S gene.
• Affected children presented with congenital hypotonia, contractures, ophthalmoplegia, and respiratory insufficiency.
• Additional features included cognitive delay, pes equinovarus deformity, and neurogenic changes.

Conclusions:

• This study expands the phenotypic spectrum of dihydropyridine receptor congenital myopathy.
• The findings underscore the importance of genetic testing, particularly whole exome sequencing, for early diagnosis.
• Consanguinity may increase the risk of recessive genetic disorders like this myopathy.