Duarte E A, Clarke D K, Moya A, Elena S F, Domingo E, Holland J
Department of Biology, University of California, San Diego, La Jolla 92093-0116.
J Virol. 1993 Jun;67(6):3620-3. doi: 10.1128/JVI.67.6.3620-3623.1993.
We showed earlier that transfers of large populations of RNA viruses lead to fitness gains and that repeated genetic bottleneck transfers result in fitness losses due to Muller's ratchet. In the present study, we examined the effects of genetic bottleneck passages intervening between population passages, a process akin to some natural viral transmissions, using vesicular stomatitis virus as a model. Our findings show that the pronounced fitness increases that occur during two successive population passages cannot overcome the fitness decreases caused by a single intervening genetic bottleneck passage. The implications for natural transmissions of RNA viruses are discussed.
我们之前表明,大量RNA病毒的转移会导致适应性增加,而由于穆勒棘轮效应,反复的遗传瓶颈转移会导致适应性损失。在本研究中,我们以水疱性口炎病毒为模型,研究了介于群体传代之间的遗传瓶颈传代的影响,这一过程类似于一些自然病毒传播。我们的研究结果表明,在连续两次群体传代过程中出现的显著适应性增加无法克服由单个中间遗传瓶颈传代所导致的适应性降低。本文讨论了这一结果对RNA病毒自然传播的影响。