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Although little is known about its role in the brain, LEDGF has been proposed to play a role in neurogenesis. Since known LEDGF binding partners, such as PogZ, CDA7L, MLL1 and MeCP2 are implicated in neurological dysfunction, we investigated the role of LEDGF in mouse brain. We developed a conditional\n                    <jats:italic>Psip1<\/jats:italic>\n                    knock-out (cKO) mouse model by crossbreeding\n                    <jats:italic>Psip1<\/jats:italic>\n                    <jats:sup>fl\/fl<\/jats:sup>\n                    mice with Nestin\n                    <jats:sup>Cre<\/jats:sup>\n                    mice, resulting in neuronal depletion of both isoforms in the central nervous system. In wild-type (WT) animals, brain region-dependent alternative splicing was evidenced, with more p75 over p52 in the cerebellum and more p52 over p75 in the hippocampus. Behavioral phenotyping revealed that already at a young age,\n                    <jats:italic>Psip1<\/jats:italic>\n                    cKO mice show motor deficits. In cerebellar neurons, LEDGF depletion results in more and smaller MeCP2 condensates. Bulk and comparative RNA sequencing of cerebellar extracts revealed downregulation of genes involved in synaptic transmission. Moreover, transcription factor network analysis showed that the differentially expressed genes are mainly regulated by the Polycomb repressive complex 2 (PRC2). Since the LEDGF\/p75 binding partner MLL1 is part of the Trithorax Complex, the counterpart of PRC2 in gene regulation, our data highlight the importance of LEDGF\/p75-mediated regulation of synaptic gene expression in the cerebellum through Trithorax.\n                  <\/jats:p>","DOI":"10.1186\/s40478-025-02216-4","type":"journal-article","created":{"date-parts":[[2026,1,23]],"date-time":"2026-01-23T12:54:05Z","timestamp":1769172845000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Absence of Ledgf in mouse brain affects the Kmt2a\/b and polycomb balance, synaptic transmission and motor function"],"prefix":"10.1186","volume":"14","author":[{"given":"Laura","family":"Debusschere","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eduard","family":"Bentea","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cecilia","family":"Iglesias-Herrero","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nicolas","family":"Peredo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Siska","family":"Van Belle","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nam Joo","family":"Van der Veken","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anna","family":"Barber-Janer","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dieter","family":"Plessers","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wouter","family":"Peelaerts","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wout","family":"Hannes","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Martine","family":"Michiels","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chris","family":"Van den Haute","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Veerle","family":"Baekelandt","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zeger","family":"Debyser","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2026,1,23]]},"reference":[{"issue":"1\u20132","key":"2216_CR1","doi-asserted-by":"publisher","first-page":"265","DOI":"10.1016\/S0378-1119(99)00506-5","volume":"242","author":"DP Singh","year":"2000","unstructured":"Singh DP, Akira K, Leo TC, Toshimichi S (2000) Lens epithelium-derived growth factor (LEDGF\/p75) and p52 are derived from a single gene by alternative splicing. 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