Common Variable Immunodeficiency, Autoimmune Hemolytic Anemia, and Pancytopenia Associated With a Defect in IKAROS

J Pediatr Hematol Oncol. 2021 Apr 1;43(3):e351-e357. doi: 10.1097/MPH.0000000000001976.


Objective: Mutations in IKZF1, which encodes Ikaros family zinc finger 1 (IKAROS) transcription factor, are associated with recurrent infections, cytopenia, autoimmune diseases, and hematologic malignancies. Diverse clinical phenotypes resulting from IKZF1 mutations include pulmonary fungal infections, cytopenia, autoimmune hemolytic anemia (AIHA), and malignancies. In this study, we aimed to assess the DNA-binding ability and pericentromeric (PC) localization of a variant of IKZF discovered in a patient.

Materials and methods: DNA-binding ability of a pathogenic IKZF variant was tested using electrophoretic mobility shift assay and PC localization of the variant was assessed by immunofluorescent microscopy in NIH3T3 cells.

Results: Clinical features of a 3-month-old male infant who underwent hematopoietic stem cell transplantation because of an IKZF1 mutation-associated common variable immunodeficiency, AIHA, and pancytopenia are described. DNA studies revealed a heterozygous missense variant (IKZF1 NM_006060 c.427C>T; p.R143W). Cotransfection studies revealed that mutant R143W has a partial dominant-negative effect over PC targeting and DNA binding.

Conclusions: IKZF1 mutation must be kept in mind if neonatal AIHA, common variable immunodeficiency, and pancytopenia are observed.

Publication types

  • Case Reports
  • Research Support, N.I.H., Intramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anemia, Hemolytic, Autoimmune / complications
  • Anemia, Hemolytic, Autoimmune / genetics*
  • Anemia, Hemolytic, Autoimmune / therapy
  • Animals
  • Common Variable Immunodeficiency / complications
  • Common Variable Immunodeficiency / genetics*
  • Common Variable Immunodeficiency / therapy
  • Hematopoietic Stem Cell Transplantation
  • Humans
  • Ikaros Transcription Factor / genetics*
  • Infant
  • Male
  • Mice
  • NIH 3T3 Cells
  • Pancytopenia / complications
  • Pancytopenia / genetics*
  • Pancytopenia / therapy
  • Point Mutation


  • IKZF1 protein, human
  • Ikaros Transcription Factor