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The conoid has been suggested to derive from flagella parts, but is thought to have been lost from some apicomplexans including the malaria-causing genus <jats:italic>Plasmodium.<\/jats:italic> Presence of SAS6L in <jats:italic>Plasmodium<\/jats:italic>, therefore, suggested a possible role in flagella assembly in male gametes, the only flagellated stage. Here, we have studied the expression and role of SAS6L throughout the <jats:italic>Plasmodium<\/jats:italic> life cycle using the rodent malaria model <jats:italic>P. berghei<\/jats:italic>. Contrary to a hypothesised role in flagella, SAS6L was absent during gamete flagellum formation. Instead, SAS6L was restricted to the apical complex in ookinetes and sporozoites, the extracellular invasive stages that develop within the mosquito vector. In these stages SAS6L forms an apical ring, as we show is also the case in <jats:italic>Toxoplasma<\/jats:italic> tachyzoites. The SAS6L ring was not apparent in blood-stage invasive merozoites, indicating that the apical complex is differentiated between the different invasive forms. Overall this study indicates that a conoid-associated apical complex protein and ring structure is persistent in <jats:italic>Plasmodium<\/jats:italic> in a stage-specific manner.<\/jats:p>","DOI":"10.1038\/srep28604","type":"journal-article","created":{"date-parts":[[2016,6,24]],"date-time":"2016-06-24T09:19:56Z","timestamp":1466759996000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":51,"title":["SAS6-like protein in Plasmodium indicates that conoid-associated apical complex proteins persist in invasive stages within the mosquito vector"],"prefix":"10.1038","volume":"6","author":[{"given":"Richard J.","family":"Wall","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Magali","family":"Roques","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicholas J.","family":"Katris","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ludek","family":"Koreny","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rebecca R.","family":"Stanway","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Declan","family":"Brady","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ross F.","family":"Waller","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rita","family":"Tewari","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2016,6,24]]},"reference":[{"key":"BFsrep28604_CR1","doi-asserted-by":"publisher","first-page":"115","DOI":"10.1038\/ncb1220","volume":"7","author":"S Leidel","year":"2005","unstructured":"Leidel, S., Delattre, M., Cerutti, L., Baumer, K. & Gonczy, P. 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