Activation-induced cytidine deaminase targets DNA at sites of RNA polymerase II stalling by interaction with Spt5

Item Type:	Article
Title:	Activation-induced cytidine deaminase targets DNA at sites of RNA polymerase II stalling by interaction with Spt5
Creators Name:	Pavri, R. and Gazumyan, A. and Jankovic, M. and Di Virgilio, M. and Klein, I. and Ansarah-Sobrinho, C. and Resch, W. and Yamane, A. and Reina San-Martin, B. and Barreto, V. and Nieland, T.J. and Root, D.E. and Casellas, R. and Nussenzweig, M.C.
Abstract:	Activation-induced cytidine deaminase (AID) initiates antibody gene diversification by creating U:G mismatches. However, AID is not specific for antibody genes; Off-target lesions can activate oncogenes or cause chromosome translocations. Despite its importance in these transactions little is known about how AID finds its targets. We performed an shRNA screen to identify factors required for class switch recombination (CSR) of antibody loci. We found that Spt5, a factor associated with stalled RNA polymerase II (Pol II) and single stranded DNA (ssDNA), is required for CSR. Spt5 interacts with AID, it facilitates association between AID and Pol II, and AID recruitment to its Ig and non-Ig targets. ChIP-seq experiments reveal that Spt5 colocalizes with AID and stalled Pol II. Further, Spt5 accumulation at sites of Pol II stalling is predictive of AID-induced mutation. We propose that AID is targeted to sites of Pol II stalling in part via its association with Spt5.
Keywords:	B-Lymphocytes, Cell Line, Cytidine Deaminase, Fibroblasts, Immunoglobulin Class Switching, Immunoglobulins, Non-Histone Chromosomal Proteins, RNA Polymerase II, Transcriptional Elongation Factors, Tumor Cell Line, Animals, Mice
Source:	Cell
ISSN:	0092-8674
Publisher:	Cell Press
Volume:	143
Number:	1
Page Range:	122-133
Date:	1 October 2010
Official Publication:	https://doi.org/10.1016/j.cell.2010.09.017
PubMed:	View item in PubMed

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