Rearrangement analysis of multiple bacterial genomes.

Abstract:

BACKGROUND:Genomes are subjected to rearrangements that change the orientation and ordering of genes during evolution. The most common rearrangements that occur in uni-chromosomal genomes are inversions (or reversals) to adapt to the changing environment. Since genome rearrangements are rarer than point mutations, gene order with sequence data can facilitate more robust phylogenetic reconstruction. Helicobacter pylori is a good model because of its unique evolution in niche environment. RESULTS:We have developed a method to identify genome rearrangements by comparing almost-conserved genes among closely related strains. Orthologous gene clusters, rather than the gene sequences, are used to align the gene order so that comparison of large number of genomes becomes easier. Comparison of 72 Helicobacter pylori strains revealed shared as well as strain-specific reversals, some of which were found in different geographical locations. CONCLUSION:Degree of genome rearrangements increases with time. Therefore, gene orders can be used to study the evolutionary relationship among species and strains. Multiple genome comparison helps to identify the strain-specific as well as shared reversals. Identification of the time course of rearrangements can provide insights into evolutionary events.

journal_name

BMC Bioinformatics

journal_title

BMC bioinformatics

authors

Noureen M,Tada I,Kawashima T,Arita M

doi

10.1186/s12859-019-3293-4

subject

Has Abstract

pub_date

2019-12-27 00:00:00

pages

631

issue

Suppl 23

issn

1471-2105

pii

10.1186/s12859-019-3293-4

journal_volume

20

pub_type

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