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...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2019-01-01
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| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0220804 |
| _version_ | 1818403718602686464 |
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| author | Lis S Rocha Danielle M Silva Mônica P Silva Pedro Marcus P Vidigal José Cleydson F Silva Simony T Guerra Márcio G Ribeiro Tiago Antônio de O Mendes Andréa de O B Ribon |
| author_facet | Lis S Rocha Danielle M Silva Mônica P Silva Pedro Marcus P Vidigal José Cleydson F Silva Simony T Guerra Márcio G Ribeiro Tiago Antônio de O Mendes Andréa de O B Ribon |
| author_sort | Lis S Rocha |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-14T08:28:43Z |
| format | Article |
| id | doaj.art-28ffe0111fc046d4aeb477b172b28b51 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-14T08:28:43Z |
| publishDate | 2019-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-28ffe0111fc046d4aeb477b172b28b512022-12-21T23:09:34ZengPublic Library of Science (PLoS)PLoS ONE1932-62032019-01-01148e022080410.1371/journal.pone.0220804Comparative genomics of Staphylococcus aureus associated with subclinical and clinical bovine mastitis.Lis S RochaDanielle M SilvaMônica P SilvaPedro Marcus P VidigalJosé Cleydson F SilvaSimony T GuerraMárcio G RibeiroTiago Antônio de O MendesAndréa de O B RibonMany 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.https://doi.org/10.1371/journal.pone.0220804 |
| spellingShingle | Lis S Rocha Danielle M Silva Mônica P Silva Pedro Marcus P Vidigal José Cleydson F Silva Simony T Guerra Márcio G Ribeiro Tiago Antônio de O Mendes Andréa de O B Ribon Comparative genomics of Staphylococcus aureus associated with subclinical and clinical bovine mastitis. PLoS ONE |
| 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 |
| url | https://doi.org/10.1371/journal.pone.0220804 |
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