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• W2165378960 startingPage "1468" @default.
• W2165378960 abstract "Immunoglobulin (Ig) class switch recombination (CSR) is initiated by activation-induced cytidine deaminase (AID) that catalyzes numerous DNA cytosine deaminations within switch regions. The resulting uracils are processed by uracil base excision and/or mismatch repair enzymes that ultimately generate switch region DNA double-strand breaks (DSBs). Uracil glycosylase 2 (UNG2) is required for CSR, most likely by removing uracils to generate abasic sites. Although it is presumed that the apurinic/apyrimidinic endonuclease 1 (APE1) generates DNA strand incisions (a prerequisite for CSR) at these abasic sites, a direct test of the requirement for APE1 in CSR has been difficult because of the embryonic lethality of APE1 ablation in mice. Here, we report the successful deletion of the APE1 gene in a mouse B cell line (CH12F3) capable of robust CSR in vitro. In contrast to the general assumption that APE1 is essential for cellular viability, deletion of APE1 in CH12F3 cells has no apparent effect on cell viability or growth. Moreover, CSR in APE1-null CH12F3 cells is drastically reduced, providing direct evidence for an essential role for APE1 in switch region cleavage and CSR. Finally, deletion of AP endonuclease 2 (APE2) has no effect on CSR in either APE1-proficient or -deficient cells." @default.
• W2165378960 created "2016-06-24" @default.
• W2165378960 creator A5040049172 @default.
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• W2165378960 date "2013-04-01" @default.
• W2165378960 modified "2023-10-16" @default.
• W2165378960 title "Apurinic/Apyrimidinic Endonuclease 1 Is the Essential Nuclease during Immunoglobulin Class Switch Recombination" @default.
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• W2165378960 doi "https://doi.org/10.1128/mcb.00026-13" @default.
• W2165378960 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3624277" @default.
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• W2165378960 hasPublicationYear "2013" @default.
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