A Novel Homozygous Variant Associated With Distinct Clinical Phenotypes of SDR9C7 Nonsyndromic Epidermal Differentiation Disorder in Two Affected Patients From a Consanguineous Saudi Family

Background

Nonsyndromic Epidermal Differentiation Disorders (nEDD) are a group of heterogeneous disorders characterized by scaling and erythema. Pathogenic variants in SDR9C7 cause SDR9C7-nEDD. We report two affected siblings from a consanguineous Saudi family presenting with distinct clinical phenotypes. The older affected brother exhibited generalized xerosis with both white and brown scaling, neck hyperpigmentation, and a velvety texture on the posterior neck. The younger sister showed diffuse xerosis with fine white scaling and marked palmoplantar hyperlinearity.