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Expression of a Cryptic Secondary Sigma Factor Gene Unveils Natural Competence for DNA Transformation in Staphylococcus aureus
http://hdl.handle.net/2241/118127
http://hdl.handle.net/2241/118127851b5eab-908e-4471-a3db-8c3f44729237
名前 / ファイル | ライセンス | アクション |
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PP_8-11.pdf (3.1 MB)
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Item type | Journal Article(1) | |||||
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公開日 | 2013-01-21 | |||||
タイトル | ||||||
タイトル | Expression of a Cryptic Secondary Sigma Factor Gene Unveils Natural Competence for DNA Transformation in Staphylococcus aureus | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Morikawa, Kazuya
× Morikawa, Kazuya× Takemura, Aya J.× Inose, Yumiko× Tsai, Melody× Le, Thuy Nguyen Thi× Ohta, Toshiko× Msadek, Tarek |
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著者別名 |
森川, 一也
× 森川, 一也 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | It has long been a question whether Staphylococcus aureus, a major human pathogen, is able to develop natural competence for transformation by DNA. We previously showed that a novel staphylococcal secondary sigma factor, SigH, was a likely key component for competence development, but the corresponding gene appeared to be cryptic as its expression could not be detected during growth under standard laboratory conditions. Here, we have uncovered two distinct mechanisms allowing activation of SigH production in a minor fraction of the bacterial cell population. The first is a chromosomal gene duplication rearrangement occurring spontaneously at a low frequency [≤10−5], generating expression of a new chimeric sigH gene. The second involves post-transcriptional regulation through an upstream inverted repeat sequence, effectively suppressing expression of the sigH gene. Importantly, we have demonstrated for the first time that S. aureus cells producing active SigH become competent for transformation by plasmid or chromosomal DNA, which requires the expression of SigH-controlled competence genes. Additionally, using DNA from the N315 MRSA strain, we successfully transferred the full length SCCmecII element through natural transformation to a methicillin-sensitive strain, conferring methicillin resistance to the resulting S. aureus transformants. Taken together, we propose a unique model for staphylococcal competence regulation by SigH that could help explain the acquisition of antibiotic resistance genes through horizontal gene transfer in this important pathogen. | |||||
書誌情報 |
PLOS pathogens 巻 8, 号 11, p. e1003003, 発行日 2012-11 |
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書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA12072310 | |||||
PubMed番号 | ||||||
識別子タイプ | PMID | |||||
関連識別子 | 23133387 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1371/journal.ppat.1003003 | |||||
権利 | ||||||
権利情報 | © 2012 Morikawa et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. | |||||
著者版フラグ | ||||||
値 | publisher | |||||
出版者 | ||||||
出版者 | Public Library of Science | |||||
URI | ||||||
識別子 | http://hdl.handle.net/2241/118127 | |||||
識別子タイプ | HDL |