{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,25]],"date-time":"2026-10-25T05:19:38Z","timestamp":1792905578710,"version":"4.5.0"},"reference-count":73,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2023,10,12]],"date-time":"2023-10-12T00:00:00Z","timestamp":1697068800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000065","name":"National Institute of Neurological Disorders and Stroke","doi-asserted-by":"publisher","award":["R01NS104038 R01NS133694"],"award-info":[{"award-number":["R01NS104038 R01NS133694"]}],"id":[{"id":"10.13039\/100000065","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100011781","name":"Shriners Hospitals for Children","doi-asserted-by":"publisher","award":["85134-PHI-21 85111-PHI-23"],"award-info":[{"award-number":["85134-PHI-21 85111-PHI-23"]}],"id":[{"id":"10.13039\/100011781","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Cell Dev. Biol."],"abstract":"<jats:p>The mosaic variegated aneuploidy (MVA)-associated gene <jats:italic>Budding Uninhibited by Benzimidazole 1B<\/jats:italic> (<jats:italic>BUB1B<\/jats:italic>) encodes BUBR1, a core member of the spindle assembly checkpoint complex that ensures kinetochore-spindle attachment for faithful chromosome segregation. <jats:italic>BUB1B<\/jats:italic> mutation in humans and its deletion in mice cause microcephaly. In the absence of BubR1 in mice, massive cell death reduces cortical cells during neurogenesis. However, the molecular and cellular mechanisms triggering cell death are unknown. In this study, we performed three-dimensional imaging analysis of mitotic BubR1-deficient neural progenitors in a murine model to show profound chromosomal segregation defects and structural abnormalities. Chromosomal defects and accompanying DNA damage result in P53 activation and apoptotic cell death in <jats:italic>BubR1<\/jats:italic> mutants. To test whether the P53 cell death pathway is responsible for cortical cell loss, we co-deleted <jats:italic>Trp53<\/jats:italic> in BubR1-deficient cortices. Remarkably, we discovered that residual apoptotic cell death remains in double mutants lacking P53, suggesting P53-independent apoptosis. Furthermore, the minimal rescue of cortical size and cortical neuron numbers in double mutant mice suggests the compelling extent of alternative death mechanisms in the absence of P53. This study demonstrates a potential pathogenic mechanism for microcephaly in MVA patients and uncovers the existence of powerful means of eliminating unfit cells even when the P53 death pathway is disabled.<\/jats:p>","DOI":"10.3389\/fcell.2023.1282182","type":"journal-article","created":{"date-parts":[[2023,10,12]],"date-time":"2023-10-12T17:23:36Z","timestamp":1697131416000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":9,"title":["P53 independent pathogenic mechanisms contribute to BubR1 microcephaly"],"prefix":"10.3389","volume":"11","author":[{"given":"Noelle A.","family":"Sterling","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bethany K.","family":"Terry","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julia M.","family":"McDonnell","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seonhee","family":"Kim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2023,10,12]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"931","DOI":"10.1016\/s0960-9822(95)00183-7","article-title":"High-frequency developmental abnormalities in p53-deficient mice","volume":"5","author":"Armstrong","year":"1995","journal-title":"Curr. 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