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Novel mutations in a Japanese patient with CD19 deficiency

Genes & Immunity volume 8, pages 663–670 (2007)Cite this article

Abstract

Common variable immunodeficiency (CVID) is a heterogeneous disorder characterized by recurrent bacterial infections, hypogammaglobulinemia and low to normal numbers of circulating B cells. Mutations in the ICOS, TACI and CD19 genes have recently been identified in <10% of CVID patients. We, herein, describe two novel CD19 gene disruptions in an 8-year-old Japanese boy, who had been clinically diagnosed as having CVID at the age of 5 years. Flow-cytometric analysis demonstrated absence of CD19 and reduced CD21 expression on CD20-postive peripheral blood B cells. Mutation analysis of CD19 revealed a mutation in the splice acceptor site of intron 5 (IVS5-1G>T) of the maternal allele, resulting in skipping of exon 6, and a truncated protein product. The paternal allele was disrupted by a gross deletion encompassing at least the ATP2A1, CD19 and NFATC2IP genes. The patient had a small number of IgD− CD27+ memory B cells, in which somatic mutation were detected. His B cells showed substantial proliferation upon stimulation, but reduced IgG and IgA production in vitro. These findings extend the mutation spectrum of the CD19 deficiency to four, and confirm the homogeneity of the CD19 deficiency as a unique type of CVID.

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Acknowledgements

We thank Ms Chikako Sakai, Ms Junko Michino, Mr Hitoshi Moriuchi and Dr Shunji Yamamori for their excellent technical assistance. This study was supported by a Grant-in-Aid for scientific research from the Ministry of Education, Culture, Sports and Technology, Japan, and grants from the Ministry of Health, Labour and Welfare, Japan. MCvZ was supported by Grant 349 from the foundation ‘Sophia Kinderziekenhuis Fonds’. The authors have no financial conflict of interest.

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Author notes

  1. H Kanegane and K Agematsu: These authors contributed equally to this work.

Authors and Affiliations

  1. Department of Pediatrics, Graduate School of Medicine, University of Toyama, Toyama, Japan

    H Kanegane, T Futatani, M M Sira & T Miyawaki

  2. Department of Infection and Host Defense, Shinshu University Graduate School of Medicine, Matsumoto, Japan

    K Agematsu

  3. Department of Pediatrics, Takamatsu Red Cross Hospital, Takamatsu, Japan

    K Suga & T Sekiguchi

  4. Department of Immunology, University Medical Center, Erasmus MC, Rotterdam, The Netherlands

    M C van Zelm

Authors
  1. H Kanegane
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  2. K Agematsu
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  3. T Futatani
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  4. M M Sira
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  5. K Suga
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  6. T Sekiguchi
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  7. M C van Zelm
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  8. T Miyawaki
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Correspondence to H Kanegane.

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Kanegane, H., Agematsu, K., Futatani, T. et al. Novel mutations in a Japanese patient with CD19 deficiency. Genes Immun 8, 663–670 (2007). https://doi.org/10.1038/sj.gene.6364431

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