Single-cell genomics reveal low recombination frequencies in freshwater bacteria of the SAR11 clade

Zaremba-Niedzwiedzka K, Viklund J, Zhao W, Ast J, Sczyrba A, Woyke T, McMahon K, Bertilsson S, Stepanauskas R, Andersson SG (2013)
Genome biology 14(11): R130.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
Download
Es wurde kein Volltext hochgeladen. Nur Publikationsnachweis!
Autor/in
; ; ; ; ; ; ; ; ;
Abstract / Bemerkung
BACKGROUND: The SAR11 group of Alphaproteobacteria is highly abundant in the oceans. It contains a recently diverged freshwater clade, which offers the opportunity to compare adaptations to salt- and freshwaters in a monophyletic bacterial group. However, there are no cultivated members of the freshwater SAR11 group and no genomes have been sequenced yet. RESULTS: We isolated ten single SAR11 cells from three freshwater lakes and sequenced and assembled their genomes. A phylogeny based on 57 proteins indicates that the cells are organized into distinct microclusters. We show that the freshwater genomes have evolved primarily by the accumulation of nucleotide substitutions and that they have among the lowest ratio of recombination to mutation estimated for bacteria. In contrast, members of the marine SAR11 clade have one of the highest ratios. Additional metagenome reads from six lakes confirm low recombination frequencies for the genome overall and reveal lake-specific variations in microcluster abundances. We identify hypervariable regions with gene contents broadly similar to those in the hypervariable regions of the marine isolates, containing genes putatively coding for cell surface molecules. CONCLUSIONS: We conclude that recombination rates differ dramatically in phylogenetic sister groups of the SAR11 clade adapted to freshwater and marine ecosystems. The results suggest that the transition from marine to freshwater systems has purged diversity and resulted in reduced opportunities for recombination with divergent members of the clade. The low recombination frequencies of the LD12 clade resemble the low genetic divergence of host-restricted pathogens that have recently shifted to a new host.
Erscheinungsjahr
2013
Zeitschriftentitel
Genome biology
Band
14
Ausgabe
11
Seite(n)
R130
ISSN
1465-6906
Page URI
https://pub.uni-bielefeld.de/record/2638234

Zitieren

Zaremba-Niedzwiedzka K, Viklund J, Zhao W, et al. Single-cell genomics reveal low recombination frequencies in freshwater bacteria of the SAR11 clade. Genome biology. 2013;14(11):R130.
Zaremba-Niedzwiedzka, K., Viklund, J., Zhao, W., Ast, J., Sczyrba, A., Woyke, T., McMahon, K., et al. (2013). Single-cell genomics reveal low recombination frequencies in freshwater bacteria of the SAR11 clade. Genome biology, 14(11), R130. doi:10.1186/gb-2013-14-11-r130
Zaremba-Niedzwiedzka, K., Viklund, J., Zhao, W., Ast, J., Sczyrba, A., Woyke, T., McMahon, K., Bertilsson, S., Stepanauskas, R., and Andersson, S. G. (2013). Single-cell genomics reveal low recombination frequencies in freshwater bacteria of the SAR11 clade. Genome biology 14, R130.
Zaremba-Niedzwiedzka, K., et al., 2013. Single-cell genomics reveal low recombination frequencies in freshwater bacteria of the SAR11 clade. Genome biology, 14(11), p R130.
K. Zaremba-Niedzwiedzka, et al., “Single-cell genomics reveal low recombination frequencies in freshwater bacteria of the SAR11 clade”, Genome biology, vol. 14, 2013, pp. R130.
Zaremba-Niedzwiedzka, K., Viklund, J., Zhao, W., Ast, J., Sczyrba, A., Woyke, T., McMahon, K., Bertilsson, S., Stepanauskas, R., Andersson, S.G.: Single-cell genomics reveal low recombination frequencies in freshwater bacteria of the SAR11 clade. Genome biology. 14, R130 (2013).
Zaremba-Niedzwiedzka, Katarzyna, Viklund, Johan, Zhao, Weizhou, Ast, Jennifer, Sczyrba, Alexander, Woyke, Tanja, McMahon, Katherina, Bertilsson, Stefan, Stepanauskas, Ramunas, and Andersson, Siv Ge. “Single-cell genomics reveal low recombination frequencies in freshwater bacteria of the SAR11 clade”. Genome biology 14.11 (2013): R130.

Export

Markieren/ Markierung löschen
Markierte Publikationen

Open Data PUB

Web of Science

Dieser Datensatz im Web of Science®

Quellen

PMID: 24286338
PubMed | Europe PMC

Suchen in

Google Scholar