期刊
NATURE IMMUNOLOGY
卷 5, 期 12, 页码 1275-1281出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ni1137
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- NIAID NIH HHS [AI07512, AI31541] Funding Source: Medline
Immunoglobulin H class-switch recombination (CSR) occurs between switch regions and requires transcription and activation-induced cytidine deaminase (AID). Transcription through mammalian switch regions, because of their GC-rich composition, generates stable R-loops, which provide single-stranded DNA substrates for AID. However, we show here that the Xenopus laevis switch region S-mu, which is rich in AT and not prone to form R-loops, can functionally replace a mouse switch region to mediate CSR in vivo. X. laevis S-mu-mediated CSR occurred mostly in a region of AGCT repeats targeted by the AID-replication protein A complex when transcribed in vitro. We propose that AGCT is a primordial CSR motif that targets AID through a non-R-loop mechanism involving an AID-replication protein A complex.
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