Linked Life Data

14768938

Source:http://linkedlifedata.com/resource/pubmed/id/14768938

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2-4
pubmed:dateCreated
2004-2-10
pubmed:abstractText
Somatic hypermutation (SHM) and class switch recombination (CSR) take place in B cells of the germinal center (GC) and are associated with DNA double-strand breaks (DNA-DSBs). Transcription favors the generation of DNA-DSBs in the V-regions and switch regions of Ig genes. Both SHM and CSR are controlled by the Activation Induced Cytidine Deaminase (AID), an enzyme exclusively expressed in B cells of the GC. Because AID is capable of deaminating deoxy-cytidine (dC) to deoxy-uracil (dU), it might directly induce nicks (single strand DNA breaks) and also DNA-DSBs via a U-DNA glycosylase mediated base excision repair pathway ('DNA-substrate model'). Alternatively, AID could function like its closest homologue Apobec-1 as a catalytic subunit of a RNA editing holoenzyme ('RNA-substrate model'). To determine whether AID lies upstream or downstream of the DNA lesions found in hypermutating Ig genes, we have analysed the Vlambda locus of AID proficient and AID deficient GC B cells for the presence of DNA-DSBs. Although rearranged Vlambda genes are preferred targets of SHM we find that AID-proficient and -deficient Vlambda1/2-expressing GC B cells display a similar frequency, distribution and sequence preference of DNA-DSBs in rearranged and germline Vlambda genes, favoring the idea that AID acts downstream of the DNA lesions to mediate error prone processing.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1740-2522
pubmed:author
pubmed:issnType
Print
pubmed:volume
10
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
83-9
pubmed:dateRevised
2008-11-20
pubmed:meshHeading
pubmed:articleTitle
DNA double strand breaks occur independent of AID in hypermutating Ig genes.
pubmed:affiliation
Department Immunology, University of Maastricht, Research Institute Growth and Development, Universiteits Singel 50, 6200 MD Maastricht, The Netherlands.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't