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Pav localizes to the equatorial region and the inner central spindle of late anaphase wild\u2010type spermatogonia and displays a strong concentration at the midbody during late telophase. At metaphase of the first meiotic division, Pav shows widespread localization on the equatorial region of the spermatocytes. This unusual distribution restricts and enhances during anaphase where antiparallel cortical microtubules overlap. Additional Pav staining is also found in the inner central spindle where the microtubules overlap between the segregating chromosomes. At late telophase, Pav accumulates to the midbody and on a weak ring that surround the cytoplasmic bridges. Pav localizes in an equatorial discontinuous ring of <jats:italic>Sas4<\/jats:italic> spermatogonia where the non\u2010centrosomal microtubules overlap, but the motor protein is absent in the interior central spindle where the inner microtubules are lacking. However, the anastral spindles properly support cell division, suggesting that astral microtubules are dispensable for Pav localization in the <jats:italic>Sas4<\/jats:italic> spermatogonial cell cortex. This function is presumably replaced by the antiparallel cortical microtubules extending from the acentriolar polar regions. In contrast, the majority of the meiotic spindles in <jats:italic>Sas4<\/jats:italic> mutant testes do not progress beyond late anaphase, and only a small fraction of the primary spermatocytes experienced an abnormal division with the assembly of aberrant telophase spindles. Pav accumulates around the chromatin clusters or enhanced at the plus ends of the antiparallel non\u2010centrosomal cortical bundles of microtubules. However, these bundles are not arranged properly in the equatorial region of the cell and cytokinesis is abnormal or fails. Therefore, the observations in <jats:italic>Sas4<\/jats:italic> mutant testes suggest that the spermatogonial mitoses correctly occur in the absence of astral microtubules, whereas meiotic divisions fail.<\/jats:p>","DOI":"10.1002\/cm.21986","type":"journal-article","created":{"date-parts":[[2025,1,4]],"date-time":"2025-01-04T02:58:26Z","timestamp":1735959506000},"page":"516-528","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Astral Microtubules Are Dispensable for Pavarotti Localization During Drosophila Spermatogonial Mitoses"],"prefix":"10.1002","volume":"82","author":[{"given":"Maria Giovanna","family":"Riparbelli","sequence":"first","affiliation":[{"name":"Department of Life Sciences University of Siena  Siena Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Massimo","family":"Migliorini","sequence":"additional","affiliation":[{"name":"Department of Life Sciences University of Siena  Siena Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giuliano","family":"Callaini","sequence":"additional","affiliation":[{"name":"Department of Life Sciences University of Siena  Siena Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,1,3]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1101\/gad.12.10.1483"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cub.2018.03.045"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cell.2006.05.025"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1083\/jcb.142.3.751"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature09334"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.3389\/fcell.2020.575226"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1083\/jcb.143.3.659"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pbio.0060209"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1091\/mbc.e05\u201002\u20100154"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1101\/cshperspect.a015834"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1242\/jcs.02335"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1242\/jcs.03204"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ymeth.2014.04.020"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cub.2010.03.055"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.4161\/spmg.21798"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1038\/ncb2482"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1242\/dev.127.9.1767"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.3390\/cells11040695"},{"key":"e_1_2_9_20_1","first-page":"71","volume-title":"The Development of Drosophila","author":"Fuller M. 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