Expanding the clinical and immunological phenotype of prolidase deficiency: A case report.

Prolidase deficiency (PD) is a rare autosomal recessive disorder associated with recurrent infections, immune dysregulation, and autoimmunity. PD is characterized by persistent dermatitis, skin fragility, and non-healing ulcerations on the lower limbs as its main dermatologic characteristics. Herein, we report a boy with PD due to a novel variant in PEPD who had abnormal facies, cognitive impairment, corneal opacity, recurrent infections, and persistent non-healing leg ulcers. Th17 lymphocyte counts and phosphorylated-STAT5 expression following IL-2 stimulation were reduced in our patient as compared to healthy control.