ZFYVE19 gene mutation: A novel variant of progressive familial intrahepatic cholestasis

A recent nonsyndromic phenotype, newly linked to mutations in the ZFYVE19 gene, is characterized by the appearance of cholestasis accompanied by an increase in serum gamma‐glutamyltranspeptidase (GGT) from infancy or early childhood. Affected individuals generally present with hepatosplenomegaly and may develop portal hypertension. The disease is thought to be the result of cholangiocyte‐specific ciliary dysfunction, indicating a ciliopathy that appears to be limited to the liver. Here, we describe the case of an infant born to first‐degree consanguineous parents, in whom neonatal cholestasis accompanied by elevated GGT led to the discovery of a ZFYVE19 deficiency. The diagnosis was established following an in‐depth analysis of the complete exome sequencing.