Journal of Clinical Immunology

, Volume 30, Issue 4, pp 593–601 | Cite as

Clinical Aspects and Genetic Analysis of Taiwanese Patients with Wiskott–Aldrich Syndrome Protein Mutation: The First Identification of X-Linked Thrombocytopenia in the Chinese with Novel Mutations

  • Wen-I Lee
  • Jing-Long Huang
  • Tang-Her Jaing
  • Kang-Hsi Wu
  • Yin-Hsiu Chien
  • Kuei-Wen Chang
Article

Abstract

Background

Wiskott–Aldrich syndrome (WAS) is an X-linked immunodeficiency characterized by microthrombocytopenia, eczema, and recurrent infections. However, the more than 500 patient mutations described are mainly based on Caucasian and Japanese populations. This study investigated Taiwanese patients with WASP mutations since 1985 as part of a long-term comprehensive study in primary immunodeficiency diseases (PIDs) covering 23 million inhabitants.

Methods

Clinical manifestations, immunologic functions, and WASP gene sequencing and expressions were analyzed in WAS patients. And, those patients with idiopathic thrombocytopenic purpura and “small” thrombocytopenia were enrolled.

Results

Of 16 patients studied in 1993–2009, 12 presented as classic WAS phenotype and four had X-linked thrombocytopenia (XLT). Almost all correlated to the WASP expression level and severity of infections. Causes of mortality in the 12 classic WAS patients were mass bleeding, Staphylococcus aureus sepsis, and cytomegalovirus (CMV) pneumonitis in three non-transplant cases, and EBV-associated lymphoproliferative disorder and CMV pneumonitis in two non-engrafted transplant patients. Splicing mutations of Int 8 (+5) G>A in cousins and insertion of 1023 C in unrelated families presented as both XLT and classic WAS phenotype in the same mutations. Four XLT patients, including two novel mutations of 1023 Ins C (in 2) and “double” missense mutations of 1378 C>T and 1421 T>C had relatively higher CD4+ memory cells and/or activated lymphocytes (CD3+CD69+) compared with those of classic WAS patients.

Conclusions

The lower ratio of XLT to classic WAS patients underestimates the burden of Taiwanese patients with WASP mutations, especially the XLT phenotype. A clustering pattern on exon 1 and five unique mutations (deletion of 45-48 ACCA, IVS 1 (−1) G>C, large deletion of promoter and exon 1 and 2, insertion 1023 C, and 1378 C>T and 1421 T>C) explain the genetic variations in different ethnic groups, despite the possibility of selection and ascertainment bias.

Keywords

Wiskott–Aldrich Syndrome (WAS) X-linked thrombocytopenia (XLT) primary immunodeficiency diseases (PIDs) Taiwan Chinese genetic analysis 

Notes

Acknowledgements

The authors wish to thank all of the patients and their families for their cooperation, as well as their doctors for the referrals: Bor-Luen Chiang MD, Ph.D., and Yao-Hsu Yang M.D., Ph.D., of the National Taiwan University Hospital; Shyh-Dar Shyur M.D. of MacKay Memorial Hospital; Chung-Kai Chung M.D., of China Medical University Hospital; and Shyh-Shyn Chiou M.D., Ph.D., of Kaoshing University Hospital.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Wen-I Lee
    • 1
    • 2
    • 3
  • Jing-Long Huang
    • 2
    • 3
  • Tang-Her Jaing
    • 5
  • Kang-Hsi Wu
    • 4
  • Yin-Hsiu Chien
    • 6
  • Kuei-Wen Chang
    • 7
  1. 1.Primary Immunodeficiency Care and Research (PICAR) InstituteChang Gung Memorial & Children’s Hospital and University College of MedicineKwei-ShanTaiwan
  2. 2.Primary Immunodeficiency Care and Research (PICAR) InstituteChang Gung Memorial & Children’s Hospital and University College of MedicineTaoyuanTaiwan
  3. 3.Department of Pediatric Allergy, Immunology and RheumatologyChang Gung Memorial & Children’s Hospital and University College of MedicineTaoyuanTaiwan
  4. 4.Department of Pediatric Hematology and OncologyChina Medical UniversityTaichungTaiwan
  5. 5.Department of Pediatric Hematology and OncologyChang Gung Memorial & Children’s Hospital and University College of MedicineTaoyuanTaiwan
  6. 6.Department of PediatricsNational Taiwan University HospitalTaipeiTaiwan
  7. 7.Department of Pediatric Gastroenterology Chang Gung Memorial & Children’s Hospital and University College of MedicineTaoyuanTaiwan

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