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Open Access Research article

Clinical and mutational features of Vietnamese children with X-linked agammaglobulinemia

Quang Van Vu1*, Taizo Wada3, Huong Thi Minh Le2, Hai Thanh Le2, Anh Thi Van Nguyen2, Ohara Osamu4, Akihiro Yachie3 and Sang Ngoc Nguyen1

Author Affiliations

1 Department of Pediatrics, Haiphong University of Medicine and Pharmacy, 72 A Nguyen Binh Khiem, Ngo Quyen, Haiphong, Vietnam

2 National Hospital of Pediatrics, Hanoi, Vietnam

3 Department of Pediatrics, Intistute of Medical, Pharmaceutical and Health Science, Kanazawa University, Kanazawa, Japan

4 Kazusa DNA Research institute, Chiba, Japan

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BMC Pediatrics 2014, 14:129  doi:10.1186/1471-2431-14-129

Published: 28 May 2014

Abstract

Background

X-linked agammaglobulinemia (XLA) is a primary immune deficiency characterized by recurrent bacterial infections and profoundly depressed serum immunoglobulin levels and circulating mature B cells. It is caused by mutations of the Bruton tyrosine kinase (BTK) gene and is the most common form of inherited antibody deficiency. To our knowledge, this is the first report of XLA from Vietnam.

Methods

We investigated the BTK gene mutations and clinical features of four unrelated Vietnamese children.

Results

The mean ages at onset and at diagnosis were 2.5 and 8 years, respectively. All patients had a medical history of otitis media, pneumonia, and septicemia at the time of diagnosis. Other infections reported included sinusitis, bronchiectasis, arthritis, skin infections, meningitis, and recurrent diarrhea. We identified one previously reported mutation (c.441G >A) and three novel mutations: two frameshifts (c.1770delG and c.1742 delG), and one nonsense (c.1249A >T).

Conclusions

The delayed diagnosis may be attributable to insufficient awareness of this rare disease on the background of frequent infections even in the immunocompetent pediatric population in Vietnam. Our results further support the importance of molecular genetic testing in diagnosis of XLA.

Keywords:
X-linked agammaglobulinemia; XLA; Bruton tyrosine kinase (BTK); Hypogammaglobulinemia; Mutation analysis; Bruton disease