ICF Syndrome in Chinese Children: Four Case Reports with Novel Mutations.

Immunodeficiency, centromeric instability, facial anomalies (ICF) syndrome is a rare autosomal recessive disorder characterized by immunodeficiency, centromeric instability, and facial dysmorphism. We report four Chinese pediatric patients with ICF syndrome diagnosed between 2018 and 2021. All patients presented with recurrent infections due to hypogammaglobulinemia. Whole-exome sequencing identified four novel mutations: CDCA7 c.695delC (p. Val233Ter), HELLS c.560T>G (p.L187W), ZBTB24 compound heterozygous (c.1228_1229delinsC and c.649_652del), and ZBTB24 homozygous (c.1208A>G, p.H403R). To our knowledge, this is the first report of CDCA7 p. Val233Ter and HELLS p.L187W mutations globally. These findings expand the mutational spectrum of ICF syndrome.