Repository of Research and Investigative Information

Repository of Research and Investigative Information

Baqiyatallah University of Medical Sciences

Trimeric autotransporter adhesins in Acinetobacter baumannii, coincidental evolution at work

(2019) Trimeric autotransporter adhesins in Acinetobacter baumannii, coincidental evolution at work. Infection Genetics and Evolution. pp. 116-127. ISSN 1567-1348

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Abstract

Trimeric autotransporter (TAA), also known as type Vc secretion system, is expressed by many strains of Acinetobacter baumannii, an opportunistic pathogen, which is responsible for nosocomial infections worldwide. TAAs, are modular homotrimeric virulence factors, containing a signal peptide, complex stalk, and conserved membrane anchoring domain. The evolutionary mechanisms underlying the evolvement of these adhesins are not clear. Here, we showed that TAA genes were laterally acquired and underwent gene duplication and recombination. The heterogeneity of TAA nucleotide sequences, GC content, codon usage, and the probability of recombination and duplication events were assessed by MEGA7. Given the heterogeneity of sequences, we used all-against-all BLAST for clustering the TAAs. The pattern of distribution of TAAs are highly scattered; GC content and codon usage for these genes are variable. Multiple events of lateral gene transfer from the early history of Acinetobacter and the occurrence of gene duplication, gene loss, and recombination after acquiring the alien genes may explain the scattered pattern of distribution of TAAs. Additionally, this gene is not present in many clinical isolates of A. baumannii, thus is not a single virulence factor attributing to the infection. The advantage of harboring such genes might be adopting to different environments by developing the biofilm communities. We suggested that TAA genes were laterally acquired in the environmental context and incidentally provided some benefits at the infection site. Thus, coincidental evolution theory may be better suited for describing the evolution of TAA genes in A. baumannii genomes.

Item Type: Article
Keywords: A. baumannii Trimeric autotransporter Bioinformatics CLANS Coincidental evolution Virulence factor biofilm formation mouse model protein virulence bacteria plasticity domain pathogenesis mechanisms expression Infectious Diseases
Divisions:
Page Range: pp. 116-127
Journal or Publication Title: Infection Genetics and Evolution
Journal Index: ISI
Volume: 71
Identification Number: https://doi.org/10.1016/j.meegid.2019.03.023
ISSN: 1567-1348
Depositing User: مهندس مهدی شریفی
URI: http://eprints.bmsu.ac.ir/id/eprint/2505

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