Identification of a homozygous nonsense mutation in KIAA0556 in a consanguineous family displaying Joubert syndrome

Abstract

Joubert Syndrome (JS) is an inherited ciliopathy associated with mutations in genes essential in primary cilium function. Whole exome sequencing in a multiplex consanguineous family from India revealed a KIAA0556 homozygous single base pair deletion mutation (c.4420del; p.Met1474Cysfs*11). Knockdown of the gene in zebrafish resulted in a ciliopathy phenotype, rescued by co-injection of wildtype cDNA. Affected siblings present a mild and classical form of Joubert syndrome allowing for further delineation of the JS associated genotypic spectrum.

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