Morelli, Giovanna, Didelot, Xavier, Kusecek, Barica, Schwarz, Sandra, Bahlawane, Christelle, Falush, Daniel, Suerbaum, Sebastian and Achtman, Mark (2010) Microevolution of Helicobacter pylori during prolonged infection of single hosts and within families. PL o S Genetics, Vol.6 (No.7). doi:10.1371/journal.pgen.1001036 ISSN 1553-7390.

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Abstract

Our understanding of basic evolutionary processes in bacteria is still very limited. For example, multiple recent dating estimates are based on a universal inter-species molecular clock rate, but that rate was calibrated using estimates of geological dates that are no longer accepted. We therefore estimated the short-term rates of mutation and recombination in Helicobacter pylori by sequencing an average of 39,300 bp in 78 gene fragments from 97 isolates. These isolates included 34 pairs of sequential samples, which were sampled at intervals of 0.25 to 10.2 years. They also included single isolates from 29 individuals (average age: 45 years) from 10 families. The accumulation of sequence diversity increased with time of separation in a clock-like manner in the sequential isolates. We used Approximate Bayesian Computation to estimate the rates of mutation, recombination, mean length of recombination tracts, and average diversity in those tracts. The estimates indicate that the short-term mutation rate is 1.4×10−6 (serial isolates) to 4.5×10−6 (family isolates) per nucleotide per year and that three times as many substitutions are introduced by recombination as by mutation. The long-term mutation rate over millennia is 5–17-fold lower, partly due to the removal of non-synonymous mutations due to purifying selection. Comparisons with the recent literature show that short-term mutation rates vary dramatically in different bacterial species and can span a range of several orders of magnitude.

Item Type:	Journal Article
Subjects:	Q Science > QR Microbiology
Divisions:	Faculty of Science, Engineering and Medicine > Science > Statistics
Library of Congress Subject Headings (LCSH):	Helicobacter pylori, Microbial mutation, Bacteria -- Evolution
Journal or Publication Title:	PL o S Genetics
Publisher:	Public Library of Science
ISSN:	1553-7390
Official Date:	22 July 2010
Dates:	Date Event 22 July 2010 Published
Volume:	Vol.6
Number:	No.7
Number of Pages:	12
DOI:	10.1371/journal.pgen.1001036
Status:	Peer Reviewed
Access rights to Published version:	Open Access (Creative Commons)
Funder:	Sixth Framework Programme (European Commission) (FP6), Deutsche Forschungsgemeinschaft (DFG), Science Foundation Ireland (SFI)
Grant number:	Ac 36/11-2 (DFG), SU 133/7-2 (DFG), INCA LSHC-CT-2005-018704 (SFP), 05/FE1/B882 (SFI)

Data sourced from Thomson Reuters' Web of Knowledge

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