Journal
SCIENCE
Volume 348, Issue 6238, Pages 1019-1023Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa4456
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Funding
- NSF [DMS-1120699, MCB-1024155, FIBR EF-0328698]
- Carnegie Institution for Science
- Stanford Graduate Fellowship
- IBM Fellowship
- National Center for Biotechnology Information [PRJNA268121]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1305433] Funding Source: National Science Foundation
- Division Of Mathematical Sciences
- Direct For Mathematical & Physical Scien [1120699] Funding Source: National Science Foundation
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Extensive fine-scale genetic diversity is found in many microbial species across varied environments, but for most, the evolutionary scenarios that generate the observed variation remain unclear. Deep sequencing of a thermophilic cyanobacterial population and analysis of the statistics of synonymous single-nucleotide polymorphisms revealed a high rate of homologous recombination and departures from neutral drift consistent with the effects of genetic hitchhiking. A sequenced isolate genome resembled an unlinked random mixture of the allelic diversity at the sampled loci. These observations suggested a quasisexual microbial population that occupies a broad ecological niche, with selection driving frequencies of alleles rather than whole genomes.
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