Background: Primary ciliopathies are a heterogeneous group of rare disorders predominantly caused by autosomal-recessive genetic variants that disrupt non-motile ciliary function. They often manifest as a syndromic phenotype, frequently involving the kidney. Biallelic pathogenic variants in C2CD3 disrupt ciliogenesis and Sonic Hedgehog (SHH) signaling, resulting in a severe ciliopathy (Orofaciodigital syndrome XIV, OMIM 615948).
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