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This study focuses on cytolysin A (ClyA), a virulence factor essential for bacterial dissemination within the human body. We show that ClyA is exclusively expressed by intracellular <jats:italic>S<\/jats:italic>. Paratyphi A within the <jats:italic>Salmonella<\/jats:italic>-containing vacuole (SCV), regulated by the PhoP\/Q system and SlyA. ClyA localizes in the bacterial periplasm, suggesting potential secretion. Deletion of TtsA, an essential Type 10 Secretion System component, completely abolishes intracellular ClyA detection and its presence in host cell supernatants. Host cells infected with wild-type <jats:italic>S<\/jats:italic>. Paratyphi A contain substantial ClyA, with supernatants capable of lysing neighboring cells. Notably, ClyA selectively lyses macrophages and erythrocytes while sparing epithelial cells. These findings identify ClyA as an intracellularly induced cytolysin, dependent on the SCV environment and secreted via a Type 10 Secretion System, with specific cytolytic activity.<\/jats:p>","DOI":"10.1038\/s41467-024-52745-0","type":"journal-article","created":{"date-parts":[[2024,9,28]],"date-time":"2024-09-28T06:02:09Z","timestamp":1727503329000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Cytolysin A is an intracellularly induced and secreted cytotoxin of typhoidal Salmonella"],"prefix":"10.1038","volume":"15","author":[{"given":"Lena","family":"Krone","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-3945-2046","authenticated-orcid":false,"given":"Srujita","family":"Mahankali","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8528-2849","authenticated-orcid":false,"given":"Tobias","family":"Geiger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,9,28]]},"reference":[{"key":"52745_CR1","doi-asserted-by":"publisher","first-page":"573","DOI":"10.1097\/00001432-200110000-00011","volume":"14","author":"D House","year":"2001","unstructured":"House, D., Bishop, A., Parry, C., Dougan, G. & Wain, J. 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