Convergent evolution of hyperswarming leads to impaired biofilm formation in pathogenic bacteria.

Convergent evolution of hyperswarming leads to impaired biofilm formation in pathogenic bacteria.
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DOI:
10.1016/j.celrep.2013.07.026
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发表时间:
2013-08-29
期刊:
影响因子:
8.8
通讯作者:
Xavier JB
Xavier JB
中科院分区:
生物学1区
文献类型:
--
作者:
van Ditmarsch D;Boyle KE;Sakhtah H;Oyler JE;Nadell CD;Déziel É;Dietrich LE;Xavier JB

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Most bacteria in nature live in surface-associated communities rather than planktonic populations. Nonetheless, how surface-associated environments shape bacterial evolutionary adaptation remains poorly understood. Here we show that subjecting Pseudomonas aeruginosa to repeated rounds of swarming, a collective form of surface migration, drives remarkable parallel evolution towards a hyperswarmer phenotype. In all independently evolved hyperswarmers, the reproducible hyperswarming phenotype is caused by parallel point mutations in a flagellar synthesis regulator, FleN, which locks the naturally mono-flagellated bacteria in a multi-flagellated state and confers a growth-rate independent advantage in swarming. Even though hyperswarmers outcompete the ancestral strain in swarming competitions, they are strongly outcompeted in biofilm formation, which is an essential trait for P. aeruginosa in environmental and clinical settings. The finding that evolution in swarming colonies reliably produces evolution of poor biofilm formers supports the existence of an evolutionary tradeoff between motility and biofilm formation.
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