Genome-wide linkage analysis and whole-exome sequencing identifies an ITGA2B mutation in a family with thrombocytopenia

Br J Haematol. 2019 Aug;186(4):574-579. doi: 10.1111/bjh.15961. Epub 2019 May 23.

Abstract

Hereditary thrombocytopenias can be subclassified based on mode of inheritance and platelet size. Here we report a family with autosomal dominant (AD) thrombocytopenia with normal platelet size. Linkage analysis and whole exome sequencing identified the R1026W substitution in ITGA2B as the causative defect. The same mutation has been previously reported in 7 Japanese families/patients with AD thrombocytopenia, but all of these patients had macrothrombocytopenia. This is the first report of a family with AD thrombocytopenia with normal platelet size resulting from mutation in ITGA2B. ITGA2B mutations should therefore be included in the differential diagnosis of this latter disorder.

Keywords: ITGA2B; autosomal dominant thrombocytopenia; hereditary thrombocytopenia; linkage analysis; whole exome sequencing.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Blood Platelets / metabolism
  • Bone Marrow / pathology
  • Exome Sequencing*
  • Female
  • Genetic Linkage*
  • Genome-Wide Association Study
  • Genotype
  • Humans
  • Integrin alpha2 / genetics*
  • Male
  • Microsatellite Repeats
  • Mutation*
  • Pedigree
  • Platelet Count
  • Sequence Analysis, DNA
  • Thrombocytopenia / diagnosis*
  • Thrombocytopenia / genetics*

Substances

  • ITGA2B protein, human
  • Integrin alpha2