PMID- 17600774 OWN - NLM STAT- MEDLINE DCOM- 20080226 LR - 20071026 IS - 1568-7864 (Print) IS - 1568-7856 (Linking) VI - 6 IP - 11 DP - 2007 Nov TI - Immunoglobulin gene conversion: synthesizing antibody diversification and DNA repair. PG - 1557-71 AB - Recent developments in the field of antibody (Ab) diversification have rapidly advanced our understanding of the molecular mechanism underlying these events. Key to these developments was the identification of activation-induced cytidine deaminase (AID) as the central regulator of secondary Ab diversification, and the elucidation of its primary function as a DNA deaminase. Incredibly, current literature suggests the existence of a shared pathway, common to all secondary diversification processes, from which the separate outcomes branch outwards at various points. Immunoglobulin gene conversion (IGC) is one of these mechanisms and is used by a number of vertebrate species in both the development of the pre-immune repertoire and in affinity maturation. In a manner similar to other Ab diversification mechanisms, IGC has managed to co-opt a normal DNA repair pathway for the generation of receptor diversity. In the case of IGC specifically, that pathway is homologous recombination (HR). A burgeoning wealth of genetic, biochemical and structural data has clarified the roles of many key HR factors, allowing new insight into its molecular mechanism. These insights, combined with those from the common mechanism of AID action, synergize to develop an emerging picture of the mechanism underlying IGC. FAU - Tang, Ephraim S AU - Tang ES AD - Department of Immunology, University of Toronto, Medical Sciences Bldg. 5265, Toronto, Canada M5S 1A8. FAU - Martin, Alberto AU - Martin A LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20070628 PL - Netherlands TA - DNA Repair (Amst) JT - DNA repair JID - 101139138 RN - 9007-49-2 (DNA) SB - IM MH - Animals MH - Antibody Diversity/*genetics MH - Cell Cycle MH - DNA/chemistry/metabolism MH - *DNA Repair MH - Gene Conversion MH - *Gene Rearrangement, B-Lymphocyte MH - Humans MH - Immunoglobulin Class Switching MH - Models, Biological RF - 121 EDAT- 2007/06/30 09:00 MHDA- 2008/02/27 09:00 CRDT- 2007/06/30 09:00 PHST- 2007/03/22 00:00 [received] PHST- 2007/05/15 00:00 [revised] PHST- 2007/05/15 00:00 [accepted] PHST- 2007/06/30 09:00 [pubmed] PHST- 2008/02/27 09:00 [medline] PHST- 2007/06/30 09:00 [entrez] AID - S1568-7864(07)00200-5 [pii] AID - 10.1016/j.dnarep.2007.05.002 [doi] PST - ppublish SO - DNA Repair (Amst). 2007 Nov;6(11):1557-71. doi: 10.1016/j.dnarep.2007.05.002. Epub 2007 Jun 28.