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X-linked thrombocytopenia in a girl.

Hirokazu Inoue1, Hidemitsu Kurosawa, Shigeaki Nonoyama

  • 1Division of Haematology, Department of Paediatrics, Dokkyo University School of Medicine, Tochigi, Japan.

British Journal of Haematology
|August 30, 2002
PubMed
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This study details the first confirmed case of X-linked thrombocytopenia (XLT) in a female patient, caused by a specific gene mutation affecting Wiskott-Aldrich syndrome protein (WASP) expression.

Area of Science:

  • Genetics
  • Hematology
  • Immunology

Background:

  • X-linked thrombocytopenia (XLT) is a rare genetic disorder primarily affecting males, characterized by low platelet counts and increased bleeding.
  • The Wiskott-Aldrich syndrome protein (WASP) gene is crucial for immune cell function and is implicated in XLT pathogenesis.

Observation:

  • A 6-year-old girl presented with petechiae and thrombocytopenia since infancy.
  • Her younger brother was also diagnosed with XLT.
  • Genetic analysis revealed a specific mutation in the WASP gene (+5th G to A on intron 6) in the patient.

Findings:

  • The patient exhibited reduced WASP expression levels, approximately one-third of healthy controls.
  • X-chromosome inactivation analysis in the patient's lymphocytes showed a random pattern.

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  • This represents the first documented case of XLT in a female patient.

    • Implications:

    • This case expands the known clinical spectrum of XLT, demonstrating its occurrence in females.
    • Understanding the genetic basis and presentation in females is crucial for accurate diagnosis and management.
    • Further research into X-chromosome inactivation patterns in affected females may provide insights into disease variability.