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. 1995 Jun;85(2):236–240.

Comparable profiles of the immunoglobulin heavy chain complementarity determining region (CDR)-3 in CD5+ and CD5- human cord blood B lymphocytes.

H Kiyoi 1, K Naito 1, R Ohno 1, T Naoe 1
PMCID: PMC1383886  PMID: 7543877

Abstract

It has been suggested that CD5+ B cells are closely related to the pathogenesis of autoimmune disease or chronic lymphocytic leukaemia, whereas the origin and physiological role of CD5+ B cells remain controversial. To study the molecular differences between CD5+ and CD5- B cells in terms of immunoglobulin gene structure, we sorted both subsets from new-born cord blood and analysed the complementarity determining region (CDR)-3 profiles of the immunoglobulin heavy chain (IgH) gene. The CDR-3 sequences from both CD5+ and CD5- B cells represented the same incidence and length of N-region, and the same usage of D and JH segments. When translated into amino acids, 24 of 32 clones (75%) and 25 of 37 clones (65.8%) from their respective subset were productive, and the composition of the deduced amino acids were similar between both subsets. These data suggest that CD5+ B cells are not a distinct lineage presenting a biased immunoglobulin repertoire in B cells.

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Selected References

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