Cyclic Neutropenia From a Novel Mutation Ala57Asp of ELANE: Phenotypic Variability in Neutropenia From Mutated Ala57 Residue

J Pediatr Hematol Oncol. 2020 May;42(4):e231-e234. doi: 10.1097/MPH.0000000000001353.

Abstract

ELANE-related neutropenia includes severe congenital neutropenia and cyclic neutropenia. Both are clinically characterized by recurrent fever, skin and oropharyngeal inflammation. We report a novel mutation in ELANE in a 20-year-old man with a history of self-limiting febrile episodes and neutropenia with a cyclic pattern since 7 years of age. Direct sequencing analysis of ELANE revealed he was heterozygous for a novel missense mutation (p.Ala57Asp). The Ala57 residue is a mutation hotspot, and all previously reported missense mutations (Ala57Ser/Thr/Val) were observed in severe congenital neutropenia cases. Thus, the present case demonstrates a phenotypic variability in ELANE-related neutropenia from mutated Ala57.

Publication types

  • Case Reports

MeSH terms

  • Adult
  • Amino Acid Substitution
  • Humans
  • Leukocyte Elastase / genetics*
  • Male
  • Mutation, Missense*
  • Neutropenia / enzymology
  • Neutropenia / genetics*

Substances

  • ELANE protein, human
  • Leukocyte Elastase

Supplementary concepts

  • Cyclic neutropenia