Macrothrombocytopenia and developmental delay with a de novo CDC42 mutation: Yet another locus for thrombocytopenia and developmental delay

Toshiki Takenouchi, Rika Kosaki, Takahiro Niizuma, Kenichiro Hata, Kenjiro Kosaki

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21 Citations (Scopus)


The combinatory phenotype of thrombocytopenia and developmental delay has been described for two genetic conditions: a chromosome 11q deletion that is referred to as Jacobsen syndrome, and a 21q22 microdeletion syndrome. Herein, we report a young girl who presented with persistent macrothrombocytopenia and a developmental delay. Whole exome sequencing revealed a de novo amino acid substitution in CDC42, a critical regulator of the cytoskeleton. Our observation recapitulates observations in mice lacking Cdc42. We suggest that this CDC42 mutation may represent yet another mechanism leading to the combinatory phenotype of persistent macrothrombocytopenia and developmental delay.

Original languageEnglish
Pages (from-to)2822-2825
Number of pages4
JournalAmerican Journal of Medical Genetics, Part A
Issue number11
Publication statusPublished - 2015 Nov 1



  • CDC42
  • Cytoskeleton
  • Developmental delay
  • Exome sequencing
  • Thrombocytopenia
  • Wiskott-Aldrich syndrome

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics

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