Recombination in the 5′ Leader of Murine Leukemia Virus Is Accurate and Influenced by Sequence Identity with a Strong Bias toward the Kissing-Loop Dimerization Region

Recombination in the 5′ Leader of Murine Leukemia Virus Is Accurate and Influenced by Sequence Identity with a Strong Bias toward the Kissing-Loop Dimerization Region
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鼠白血病病毒 5 前导序列的重组是准确的,并受到序列同一性的影响,并且强烈偏向接环二聚化区域

DOI:
10.1128/jvi.72.9.6967-6978.1998
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发表时间:
1998
影响因子:
5.4
通讯作者:
F. Pedersen
F. Pedersen
中科院分区:
医学2区
文献类型:
--
作者:
J. Mikkelsen;A. Lund;M. Duch;F. Pedersen

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ABSTRACT Retroviral recombination occurs frequently during reverse transcription of the dimeric RNA genome. By a forced recombination approach based on the transduction of Akv murine leukemia virus vectors harboring a primer binding site knockout mutation and the entire 5′ untranslated region, we studied recombination between two closely related naturally occurring retroviral sequences. On the basis of 24 independent template switching events within a 481-nucleotide target sequence containing multiple sequence identity windows, we found that shifting from vector RNA to an endogenous retroviral RNA template during minus-strand DNA synthesis occurred within defined areas of the genome and did not lead to misincorporations at the crossover site. The nonrandom distribution of recombination sites did not reflect a bias for specific sites due to selection at the level of marker gene expression. We address whether template switching is affected by the length of sequence identity, by palindromic sequences, and/or by putative stem-loop structures. Sixteen of 24 sites of recombination colocalized with the kissing-loop dimerization region, and we propose that RNA-RNA interactions between palindromic sequences facilitate template switching. We discuss the putative role of the dimerization domain in the overall structure of the reverse-transcribed RNA dimer and note that related mechanisms of template switching may be found in remote RNA viruses.
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