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AID deaminates cytosine in the context of single stranded DNA to generate uracil, essential for effective class-switch recombination, somatic hypermutation and gene conversion at the B cell immunoglobulin locus. As a nuclear DNA mutator, AID activity must be tightly controlled and regulated, but the genetic analysis of AID and other DNA deaminases has left unstudied a number of important biochemical...
When it was first isolated from extracts of HeLa cells in Josef Jiricny's laboratory, the thymine DNA glycosylase (TDG) attracted attention because of its ability to remove thymine, i.e. a normal DNA base, from G·T mispairs. This implicated a function of DNA base excision repair in the restoration of G·C base pairs following the deamination of a 5-methylcytosine. TDG turned out to be the founding...
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