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Assessing Somatic Hypermutation in Ramos B Cells after Overexpression or Knockdown of Specific Genes
Published on: November 1, 2011
Activation-induced cytidine deaminase auto-activates and triggers aberrant gene expression
Tomoyasu Isobe1, Soken-Nakazawa J Song, Prabha Tiwari
1Immuno-Medical Science, Division of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Abstract:
DNA methylation is a well-characterized epigenetic landmark involved in transcriptional regulation; however, mechanisms underlying its regulation remain poorly characterized. Recent studies demonstrate that activation-induced cytidine deaminase (AID) is involved in active DNA demethylation. AID is aberrantly expressed in inflammation-associated cancers and generates point mutations; however, cellular disorders attributed to its demethylation function are largely unexplored. Here we demonstrate that ectopic AID expression perturbs tumor-related gene expression. AID (with Gadd45) activated a methylated paired box gene 5 (Pax5) reporter construct, and induced expression and association of endogenous Pax5 with the AID promoter, suggesting that aberrant AID expression triggers an auto-activation circuit to consolidate self-expression.
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