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Aberrations in centriole structure are common in tumors, yet how these aberrations arise is unknown. Analysis of centriole structure is difficult because it requires demanding electron microscopy. Here we employ expansion microscopy to study the origins of centriole structural aberrations in large populations of human cells. We discover that centrioles do not have an elongation monitoring mechanism, which renders them prone to over-elongation, especially during prolonged mitosis induced by various factors, importantly including supernumerary centrioles. We identify that mitotic centriole over-elongation is dependent on mitotic Polo-like kinase 1, which we uncover as a novel regulator of centriole elongation in human cycling cells. While insufficient Plk1 levels lead to the formation of shorter centrioles lacking a full set of microtubule triplets, its overactivity results in over-elongated and structurally aberrant centrioles. Our data help explain the origin of structurally aberrant centrioles and why centriole numerical and structural defects coexist in tumors.<\/jats:p>","DOI":"10.1083\/jcb.201910019","type":"journal-article","created":{"date-parts":[[2020,3,7]],"date-time":"2020-03-07T02:21:48Z","timestamp":1583547708000},"update-policy":"https:\/\/doi.org\/10.1083\/jcb.crossmarkpolicy","source":"Crossref","is-referenced-by-count":45,"title":["Prolonged mitosis results in structurally aberrant and over-elongated centrioles"],"prefix":"10.1083","volume":"219","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7144-3808","authenticated-orcid":true,"given":"Dong","family":"Kong","sequence":"first","affiliation":[{"name":"Laboratory of Protein Dynamics and Signaling, National Institutes of Health\/National Cancer Institute\/Center for Cancer Research, Frederick, MD"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalie","family":"Sahabandu","sequence":"additional","affiliation":[{"name":"Laboratory of Protein Dynamics and Signaling, National Institutes of Health\/National Cancer Institute\/Center for Cancer Research, Frederick, MD"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Catherine","family":"Sullenberger","sequence":"additional","affiliation":[{"name":"Laboratory of Protein Dynamics and Signaling, National Institutes of Health\/National Cancer Institute\/Center for Cancer Research, Frederick, MD"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alejandra","family":"V\u00e1squez-Limeta","sequence":"additional","affiliation":[{"name":"Laboratory of Protein Dynamics and Signaling, National Institutes of Health\/National Cancer Institute\/Center for Cancer Research, Frederick, MD"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Delgermaa","family":"Luvsanjav","sequence":"additional","affiliation":[{"name":"Laboratory of Protein Dynamics and Signaling, National Institutes of Health\/National Cancer Institute\/Center for Cancer Research, Frederick, MD"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kimberly","family":"Lukasik","sequence":"additional","affiliation":[{"name":"Laboratory of Protein Dynamics and Signaling, National Institutes of Health\/National Cancer Institute\/Center for Cancer Research, Frederick, MD"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1879-5473","authenticated-orcid":true,"given":"Jadranka","family":"Loncarek","sequence":"additional","affiliation":[{"name":"Laboratory of Protein Dynamics and Signaling, National Institutes of Health\/National Cancer Institute\/Center for Cancer Research, Frederick, MD"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"291","published-online":{"date-parts":[[2020,4,9]]},"reference":[{"key":"2023072407035869900_bib1","doi-asserted-by":"publisher","first-page":"1233","DOI":"10.1083\/jcb.201801014","article-title":"A homeostatic clock sets daughter centriole size in flies","volume":"217","author":"Aydogan","year":"2018","journal-title":"J. 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