A unique pancreatic phenotype in a child with a WDR19-related ciliopathy: A case report and literature review of pancreatic involvement in ciliopathies.

Ciliopathies are a group of genetic disorders caused by ciliary dysfunction. Thirty-five distinct multi-organ phenotypes have been recognized, with 187 genes associated. We performed a literature review of pancreatic involvement in ciliopathies and found that pancreatic disease is an uncommon phenotype described in only a handful of these genetic disorders. We present a case report of a pediatric patient with WDR19-related ciliopathy whose degree of pancreatic disease exceeds what has previously been reported in the literature for WDR19-related ciliopathies. WDR19 is one member of the nephronophthisis (NPHP)-related ciliopathy gene family and encodes an intra-flagellar transport protein (IFT144). Our patient presented with restrictive and obstructive lung disease, short rib thoracic dysplasia, end-stage renal disease (ESRD), developmental delay, hepatic fibrosis, and severe recurrent pancreatitis. Whole-exome sequencing (GeneDx) showed two likely pathogenic WDR19 variants in trans (maternally inherited: c.742G > A, p.G248S; paternally inherited: c.617 T > C, p.L206P). Among WDR19-related ciliopathies, pancreatic involvement is rarely reported and there have been no cases of severe, recurrent pancreatitis. Through this case report and literature review we hope to emphasize that pancreatic involvement is a rare yet important clinical phenotype to recognize in ciliopathies, especially in WDR19-related ciliopathies.