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Comparative genomics of Staphylococcus aureus associated with subclinical and clinical bovine mastitis
Many efforts have been made to understand the pathogenesis of bovine mastitis to reduce losses and promote animal welfare. Staphylococcus aureus may cause bovine clinical mastitis, but it is mainly associated with subclinical infection, which is usually persistent and can easily reoccur. Here, we co...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6685620/ https://www.ncbi.nlm.nih.gov/pubmed/31390381 http://dx.doi.org/10.1371/journal.pone.0220804 |
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author | Rocha, Lis S. Silva, Danielle M. Silva, Mônica P. Vidigal, Pedro Marcus P. Silva, José Cleydson F. Guerra, Simony T. Ribeiro, Márcio G. Mendes, Tiago Antônio de O. Ribon, Andréa de O. B. |
author_facet | Rocha, Lis S. Silva, Danielle M. Silva, Mônica P. Vidigal, Pedro Marcus P. Silva, José Cleydson F. Guerra, Simony T. Ribeiro, Márcio G. Mendes, Tiago Antônio de O. Ribon, Andréa de O. B. |
author_sort | Rocha, Lis S. |
collection | PubMed |
description | Many efforts have been made to understand the pathogenesis of bovine mastitis to reduce losses and promote animal welfare. Staphylococcus aureus may cause bovine clinical mastitis, but it is mainly associated with subclinical infection, which is usually persistent and can easily reoccur. Here, we conducted a comparative genomic analysis between strains of S. aureus causing subclinical infection (Sau170, 302, 1269, 1364), previously sequenced by our group, and two well-characterized strains causing clinical mastitis (N305 and RF122) to find differences that could be linked to mastitis outcome. A total of 146 virulence-associated genes were compared and no appreciable differences were found between the bacteria. However, several nonsynonymous single nucleotide polymorphisms (SNPs) were identified in genes present in the subclinical strains when compared to RF122 and N305, especially in genes encoding host immune evasion and surface proteins. The secreted and surface proteins predicted by in silico tools were compared through multidimensional scaling analysis (MDS), revealing a high degree of similarity among the strains. The comparison of orthologous genes by OrthoMCL identified a membrane transporter and a lipoprotein as exclusive of bacteria belonging to the subclinical and clinical groups, respectively. No hit was found in RF122 and N305 for the membrane transporter using BLAST algorithm. For the lipoprotein, sequences of Sau170, 302, 1269, and 1364 with identities between 68–73% were found in the MDS dataset. A conserved region found only in the lipoprotein genes of RF122 and N305 was used for primer design. Although the polymerase chain reaction (PCR) on field isolates of S. aureus did not validate the findings for the transporter, the lipoprotein was able to separate the clinical from the subclinical isolates. These results show that sequence variation among bovine S. aureus, and not only the presence/absence of virulence factors, is an important aspect to consider when comparing isolates causing different mastitis outcomes. |
format | Online Article Text |
id | pubmed-6685620 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-66856202019-08-15 Comparative genomics of Staphylococcus aureus associated with subclinical and clinical bovine mastitis Rocha, Lis S. Silva, Danielle M. Silva, Mônica P. Vidigal, Pedro Marcus P. Silva, José Cleydson F. Guerra, Simony T. Ribeiro, Márcio G. Mendes, Tiago Antônio de O. Ribon, Andréa de O. B. PLoS One Research Article Many efforts have been made to understand the pathogenesis of bovine mastitis to reduce losses and promote animal welfare. Staphylococcus aureus may cause bovine clinical mastitis, but it is mainly associated with subclinical infection, which is usually persistent and can easily reoccur. Here, we conducted a comparative genomic analysis between strains of S. aureus causing subclinical infection (Sau170, 302, 1269, 1364), previously sequenced by our group, and two well-characterized strains causing clinical mastitis (N305 and RF122) to find differences that could be linked to mastitis outcome. A total of 146 virulence-associated genes were compared and no appreciable differences were found between the bacteria. However, several nonsynonymous single nucleotide polymorphisms (SNPs) were identified in genes present in the subclinical strains when compared to RF122 and N305, especially in genes encoding host immune evasion and surface proteins. The secreted and surface proteins predicted by in silico tools were compared through multidimensional scaling analysis (MDS), revealing a high degree of similarity among the strains. The comparison of orthologous genes by OrthoMCL identified a membrane transporter and a lipoprotein as exclusive of bacteria belonging to the subclinical and clinical groups, respectively. No hit was found in RF122 and N305 for the membrane transporter using BLAST algorithm. For the lipoprotein, sequences of Sau170, 302, 1269, and 1364 with identities between 68–73% were found in the MDS dataset. A conserved region found only in the lipoprotein genes of RF122 and N305 was used for primer design. Although the polymerase chain reaction (PCR) on field isolates of S. aureus did not validate the findings for the transporter, the lipoprotein was able to separate the clinical from the subclinical isolates. These results show that sequence variation among bovine S. aureus, and not only the presence/absence of virulence factors, is an important aspect to consider when comparing isolates causing different mastitis outcomes. Public Library of Science 2019-08-07 /pmc/articles/PMC6685620/ /pubmed/31390381 http://dx.doi.org/10.1371/journal.pone.0220804 Text en © 2019 Rocha et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Rocha, Lis S. Silva, Danielle M. Silva, Mônica P. Vidigal, Pedro Marcus P. Silva, José Cleydson F. Guerra, Simony T. Ribeiro, Márcio G. Mendes, Tiago Antônio de O. Ribon, Andréa de O. B. Comparative genomics of Staphylococcus aureus associated with subclinical and clinical bovine mastitis |
title | Comparative genomics of Staphylococcus aureus associated with subclinical and clinical bovine mastitis |
title_full | Comparative genomics of Staphylococcus aureus associated with subclinical and clinical bovine mastitis |
title_fullStr | Comparative genomics of Staphylococcus aureus associated with subclinical and clinical bovine mastitis |
title_full_unstemmed | Comparative genomics of Staphylococcus aureus associated with subclinical and clinical bovine mastitis |
title_short | Comparative genomics of Staphylococcus aureus associated with subclinical and clinical bovine mastitis |
title_sort | comparative genomics of staphylococcus aureus associated with subclinical and clinical bovine mastitis |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6685620/ https://www.ncbi.nlm.nih.gov/pubmed/31390381 http://dx.doi.org/10.1371/journal.pone.0220804 |
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