期刊
CLINICAL IMMUNOLOGY
卷 161, 期 2, 页码 120-127出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.clim.2015.08.010
关键词
CD21; CD19; CD81; Hypogammaglobulinemia; Primary antibody deficiency
类别
资金
- ZonMW (Vidi) [91712323]
Purpose: Deficiencies in CD19 and CD81 (forming the CD19-complex with CD21 and CD225) cause a severe clinical phenotype. One CD21 deficient patient has been described. We present a second CD21 deficient patient, with a mild clinical phenotype and compared the immunobiological characteristics of CD21 and CD19 deficiency. Methods: CD21 deficiency was characterized by flowcytometric immunophenotyping and sequencing. Real-time PCR, in vitro stimulation and next generation sequencing were used to characterize B-cell responses and affinity maturation in CD21(-/-) and CD19(-/-) B cells. Results: A compound heterozygous mutation in CD21 caused CD21 deficiency. CD21 B cells responded normally to in vitro stimulation and AID was transcribed. Affinity maturation was less affected by CD21 than by CD19 deficiency. Conclusions: Both CD21 and CD19 deficiencies cause hypogammaglobulinemia and reduced memory B cells. CD19 deficiency causes a more severe clinical phenotype. B-cell characteristics reflect this, both after in vitro stimulation as in affinity maturation. (C) 2015 The Authors. Published by Elsevier Inc.
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