期刊
VIROLOGY
卷 488, 期 -, 页码 137-148出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.virol.2015.10.027
关键词
Complementary strand replication; DNA damage tolerance; Polymerase eta; Polymerase zeta; Mutation rate; Geminivirus evolution
类别
资金
- Deutsche Forschungsgemeinschaft (DFG) [Je116/15-1]
Geminiviruses multiply primarily in the plant phloem, but never in meristems. Their Rep protein can activate DNA synthesis in differentiated cells. However, when their single-stranded DNA is injected into the phloem by insects, no Rep is present for inducing initial complementary strand replication. Considering a contribution of translesion synthesis (TLS) polymerases in plants, four of them (Pol eta, Pol zeta; Pol kappa Rev1) are highly and constitutively expressed in differentiated tissues like the phloem. Two geminiviruses (Euphorbia yellow mosaic virus, Cleome leaf crumple virus), inoculated either biolistically or by whiteflies, replicated in Arabidopsis thaliana mutant lines of these genes to the same extent as in wild type plants. Comparative deep sequencing of geminiviral DNAs, however, showed a high exchange rate (10(-4)-10(-3)) similar to the phylogenetic variation described before and a significant difference in nucleotide substation rates if Pol eta and pol zeta were absent, with a differential response to the viral DNA components. (C) 2015 Elsevier Inc. All rights reserved.
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