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D'Alelio D, Salmaso N, Gandolfi A. Frequent recombination shapes the epidemic population structure of Planktothrix (Cyanoprokaryota) in Italian subalpine lakes. J Phycol. 2013;49(6):1107-17doi: 10.1111/jpy.12116.
D'Alelio, D., Salmaso, N., & Gandolfi, A. (2013). Frequent recombination shapes the epidemic population structure of Planktothrix (Cyanoprokaryota) in Italian subalpine lakes. Journal of phycology, 49(6), 1107-17. https://doi.org/10.1111/jpy.12116
D'Alelio, Domenico, et al. "Frequent recombination shapes the epidemic population structure of Planktothrix (Cyanoprokaryota) in Italian subalpine lakes." Journal of phycology vol. 49,6 (2013): 1107-17. doi: https://doi.org/10.1111/jpy.12116
D'Alelio D, Salmaso N, Gandolfi A. Frequent recombination shapes the epidemic population structure of Planktothrix (Cyanoprokaryota) in Italian subalpine lakes. J Phycol. 2013 Dec;49(6):1107-17. doi: 10.1111/jpy.12116. Epub 2013 Oct 01. PMID: 27007631.
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J Phycol. 2013 Dec;49(6):1107-17. doi: 10.1111/jpy.12116. Epub 2013 Oct 01.

Frequent recombination shapes the epidemic population structure of Planktothrix (Cyanoprokaryota) in Italian subalpine lakes.

Journal of phycology

Domenico D'Alelio, Nico Salmaso, Andrea Gandolfi

Affiliations

  1. Department of Sustainable Agro-Ecosystems and Bioresources, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, San Michele all'Adige (TN), I-38010, Italy.
  2. Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, San Michele all'Adige (TN), I-38010, Italy.

PMID: 27007631 DOI: 10.1111/jpy.12116

Abstract

The planktonic genus Planktothrix, as other cyanobacteria, shows signals of both homologous and nonhomologous recombination. However, the frequency of recombination and its effect on Planktothrix population structuring is unknown. We isolated 290 Planktothrix strains from seven neighboring lakes in the subalpine Italian region and analyzed these using multilocus sequence typing. Four of six loci analyzed were polymorphic, resulting in 20 distinct multilocus genotypes. Association indices among alleles at different loci were suggestive of an "epidemic population structure," resulting from an explosive (and temporary) dominance of one genotype against a panmictic background. ClonalFrame analyses supported this view by detecting: (i) three major clades affected by three distinct recombination events, (ii) a recombination rate about equal to the mutation rate, and (iii) the fact that recombination had an impact on introducing molecular diversity more than double the mutation rate. Furthermore, analysis of molecular variance over an annual cycle in three of seven lakes revealed that both local clonal expansion and recombination processes affected among-lake diversity. Our observations suggest that recombination affects microevolution of Planktothrix and that an epidemic structure can emerge in populations of this genus.

© 2013 Phycological Society of America.

Keywords: ClonalFrame; cyanobacteria; genetic recombination; linkage disequilibrium; population structure

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