James Crowe
Faculty Member
Last active: 3/31/2019

Rotavirus-specific CD5+ B cells in young children exhibit a distinct antibody repertoire compared with CD5- B cells.

Weitkamp JH, Lafleur BJ, Crowe JE
Hum Immunol. 2006 67 (1-2): 33-42

PMID: 16698423 · DOI:10.1016/j.humimm.2006.02.024

Antiviral antibody responses in infants are limited in quality. One reason for this finding could be that the majority of B cells in infants are CD5+ cells, a subset of B cells that is thought to contain cells expressing polyreactive, low-affinity B cell receptors. We analyzed the rotavirus (RV)-specific antibody heavy chain variable region (VH) repertoire in CD5+ and CD5- B cells of four RV-infected children between 10 and 19 months of age. We found that the RV-specific B cell repertoire in CD5+ cells was VH3 family biased, in contrast to the VH1/VH4 dominance seen in CD5- B cells. The immunodominant RV-specific gene segment in CD5- B cells was VH1-46, which is the dominant segment used in RV-specific peripheral blood B cells from infants and adults. In contrast, the immunodominant gene segment was VH3-23 in RV-specific CD5+ B cells, which is the dominant gene segment in randomly selected B cells. Both RV-specific CD5+ and RV-specific CD5- B cells from all children studied demonstrated very low frequencies of somatic mutations. In conclusion, CD5+ B cells in infants responding to RV use an antibody gene repertoire that differs from the virus-specific repertoire of CD5- B cells, and both CD5+ and CD5- RV-specific B cells exhibit a low frequency of somatic mutations.

MeSH Terms (16)

Antibodies, Viral Antibody Formation B-Lymphocyte Subsets Base Sequence CD5 Antigens Complementarity Determining Regions Female Humans Immunoglobulin Heavy Chains Immunoglobulin Variable Region Infant Male Molecular Sequence Data Mutation Rotavirus Rotavirus Infections

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