Clinical and genetic analysis of two patients with congenital neutropenia caused by ELANE gene mutation

OBJECTIVE To explore the clinical characteristics of congenital neutropenia caused by ELANE gene mutations. METHODS Clinical manifestations, absolute blood neutrophil count, high-throughput exome sequencing for mutation screening, suspected locus Sanger sequencing verification, processes of diagnosis and treatment of two patients with congenital neutropenia caused by ELANE gene mutation were retrospectively analyzed. RESULTS High-throughput sequencing has found that proband 1 has carried a heterozygous c.170C>T (p.Ala57Val) missense mutation in exon 2 of the ELANE gene, which was known to be pathological, and a heterozygous c.251T>G (p.Leu84Arg) mutation in exon 3 of proband 2, which was unreported previously. Sanger sequencing confirmed that neither mutation was inherited from their parents. CONCLUSION ELANE mutation is an important cause for congenital neutropenia. Detection of new pathogenic variants has enriched the mutation spectrum of the ELANE gene.