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Activation-induced cytidine deaminase (AID) is strongly expressed in the fetal bovine ileal Peyer's patch and spleen and is associated with expansion of the primary antibody repertoire in the absence of exogenous antigens.
MedLine Citation:
PMID:  23299615     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Due to a limited range of immunoglobulin (Ig) genes, cattle and several other domestic animals rely on postrecombinatorial amplification of the primary repertoire. We report that activation-induced cytidine deaminase (AID) is strongly expressed in the fetal bovine ileal Peyer's patch and spleen but not in fetal bone marrow. The numbers of IGHV (immunoglobulin heavy chain variable) mutations correlate with AID expression. The mutational profile in the fetuses is similar to postnatal and immunized calves, with targeting of complementarity-determining region (CDR) over framework region (FR), preference of replacement over silent mutations in CDRs but not in FRs, and targeting of the AID hotspot motif RGYW/WRCY. Statistical analysis indicates negative selection on FRs and positive selection on CDRs. Our results suggest that AID-mediated somatic hypermutation and selection take place in bovine fetuses, implying a role for AID in the diversification of the primary antibody repertoire in the absence of exogenous antigens.Mucosal Immunology advance online publication 9 January 2013. doi:10.1038/mi.2012.132.
Authors:
J Liljavirta; A Ekman; J S Knight; A Pernthaner; A Iivanainen; M Niku
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-09
Journal Detail:
Title:  Mucosal immunology     Volume:  -     ISSN:  1935-3456     ISO Abbreviation:  Mucosal Immunol     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101299742     Medline TA:  Mucosal Immunol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland.
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