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Pan-Genome of Brucella Species

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Abstract

Whole-genome sequencing of bacterial pathogens has high impact on diagnosis and development of prophylaxis to human and veterinary disease. To study the genetic variations and relatedness among Brucella spp., we have examined the pan-genomic content of 18 Brucella complete genomes from NCBI using GView and Panseq server. Multiple sequence alignment of 16S rRNA gene sequences and multiple genome alignment of all 18 Brucella spp. showed high conservation at the nucleotide level. The core, accessory and unique gene content of Brucella spp. were estimated to be 2473, 7972 and 235 respectively. The presence of strain specific region in chromosome 1 of B. melitensis M5-90 and chromosome 2 of B. microti CCM 4915, B. pinnipedialis B2/94, and B. suis ATCC 23445 were identified. In addition, a stretch of genetic pool harboring 206 strain specific coding genes trans-located from chromosome 1 to chromosome 2 were also identified in the genome of B. suis ATCC 23445. Pan-genome analysis has also revealed the integration of strain specific 23 CDS (57.82 Kb) and 6 CDS (12 Kb) in B. pinnipedialis B2/94 and B. microti CCM 4915, respectively. Major pathogenic determinants like virB operon, non-classical lipopolysaccharide, two-component system BvrR/BvrS and cyclic β-1, 2-glucan synthase were unanimously found in all Brucella spp.. The virulence genes such as flagella, type III secretion system, hemolysins, outer membrane proteins, acvB, MViN and genes involved in eryrthritol metabolism were found in the accessory genome, which may guide the host specificity.

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Acknowledgments

The work was financially supported by the Department of Biotechnology, Govt. of India under DBT-Network Project on Brucellosis. One of the authors JS thank DBT for financial support. Authors also acknowledge the UGC-CAS, UGC-CEGS, UGC-NRCBS, DBT-IPLS and DST-PURSE programs of SBS, MKU.

Conflict of interest

The authors have declared that no conflict of interests exists.

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Authors and Affiliations

  1. Department of Genetics, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625021, Tamil Nadu, India

    Jagadesan Sankarasubramanian, Udayakumar S. Vishnu, Jayavel Sridhar, Paramasamy Gunasekaran & Jeyaprakash Rajendhran

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  1. Jagadesan Sankarasubramanian
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  2. Udayakumar S. Vishnu
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Correspondence to Jeyaprakash Rajendhran.

Electronic supplementary material

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12088_2014_486_MOESM1_ESM.xlsx

The core genes, accessory genes and the unique genes were denoted with different colour fonts (Core genes- red, Accessory genes-green and Unique genes-violet). Supplementary material 1 (XLSX 645 kb)

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Sankarasubramanian, J., Vishnu, U.S., Sridhar, J. et al. Pan-Genome of Brucella Species. Indian J Microbiol 55, 88–101 (2015). https://doi.org/10.1007/s12088-014-0486-4

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  • DOI: https://doi.org/10.1007/s12088-014-0486-4

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