Opposing effects of final population density and stress on Escherichia coli mutation rate.
Opposing effects of final population density and stress on Escherichia coli mutation rate.
复制标题
DOI:
10.1038/s41396-018-0237-3
复制
发表时间:
2018-12
期刊:
影响因子:
--
通讯作者:
Knight CG
中科院分区:
文献类型:
--
作者:
Krašovec R;Richards H;Gifford DR;Belavkin RV;Channon A;Aston E;McBain AJ;Knight CG
Evolution depends on mutations. For an individual genotype, the rate at which mutations arise is known to increase with various stressors (stress-induced mutagenesis—SIM) and decrease at high final population density (density-associated mutation-rate plasticity—DAMP). We hypothesised that these two forms of mutation-rate plasticity would have opposing effects across a nutrient gradient. Here we test this hypothesis, culturing Escherichia coli in increasingly rich media. We distinguish an increase in mutation rate with added nutrients through SIM (dependent on error-prone polymerases Pol IV and Pol V) and an opposing effect of DAMP (dependent on MutT, which removes oxidised G nucleotides). The combination of DAMP and SIM results in a mutation rate minimum at intermediate nutrient levels (which can support 7 × 108 cells ml−1). These findings demonstrate a strikingly close and nuanced relationship of ecological factors—stress and population density—with mutation, the fuel of all evolution.
登录
查看更多内容
影响因子:
1.9
作者:
Belavkin, Roman V.;Channon, Alastair;Aston, Elizabeth;Aston, John;Krasovec, Rok;Knight, Christopher G.
通讯作者:
Knight, Christopher G.
DOI:
10.1085/jgp.28.2.103
发表时间:
1944-01-01
期刊:
JOUR GEN PHYSIOL
影响因子:
--
作者:
Myers, Jack;Clark, L. B.
通讯作者:
Clark, L. B.
影响因子:
56.9
作者:
Robert, Lydia;Ollion, Jean;Elez, Marina
通讯作者:
Elez, Marina
影响因子:
9.9
作者:
通讯作者:
--
DOI:
10.1038/nrmicro2259
发表时间:
2010-01
期刊:
Nature reviews. Microbiology
影响因子:
--
作者:
通讯作者:
--