Congenital Alopecia, Hypoplastic Kidneys, Growth Restriction, Growth Hormone Resistance, and Liver Fibrosis: Confirmation of a New Syndrome Caused by Biallelic Variants in ZPR1.

We report two female siblings, a 13-month-old and a newborn, with multiple anomalies including hypoplastic kidneys, severe growth restriction, facial dysmorphism, and alopecia, both found to be homozygous for the c.587 T>C variant in ZPR1. Their clinical features are strikingly similar to those previously reported in a patient who was homozygous for the same variant. Our report confirms that homozygosity for c.587 T>C in ZPR1 underlies a novel genetic syndrome with autosomal recessive inheritance and that c.587 T>C is a founder variant for ZPR1 disorder in the Middle Rio Grande Valley. We expand our understanding of the phenotype by describing abnormal glucose homeostasis, growth hormone resistance, and progressive liver disease with decompensated portal hypertension and esophageal varices despite the absence of cirrhosis.