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Emerging evidence highlights the pivotal role of mitochondrial function as one of these fundamental pathways involved in neurodevelopment. Our study investigates the role of 4-hydroxyphenylpyruvate dioxygenase-like (HPDL) protein in cortical neurogenesis and mitochondrial activity, since mutations in the\n                    <jats:italic>HPDL<\/jats:italic>\n                    gene are associated with a childhood-onset form of hereditary spastic paraplegia characterized by corticospinal tract degeneration and cortical abnormalities. Starting from mutant neuroblastoma cells, we demonstrated that HPDL is important to respiratory chain supercomplex assembly and cellular redox balance. Moreover, RNA-seq studies revealed dysregulated pathways related to brain development. Generation of cortical neurons and organoids from HPDL patient-derived induced pluripotent stem cells exhibited premature neurogenesis at early differentiation stages, likely leading to depletion of cortical progenitors, as evidenced by decreased proliferation, slight increase of apoptosis, and unbalanced cortical type composition at later stages. Cortical organoids showed failure to grow at a normal rate, a feature highly reminiscent of the \u201cmicrocephaly\u201d observed in severe HPDL children. Mitochondrial morpho-functional characterization in mutant neurons confirmed disruption of OxPhos chain functionality in neuroblastoma knock-out model cells and HPDL mutant cortical progenitors also displayed defects in respirasome assembly and increased ROS generation rate. Treatment of mutant cortical cells with antioxidants and CoQ\n                    <jats:sub>10<\/jats:sub>\n                    intermediates partially rescued premature neurogenesis depending on the mutational context, suggesting potential future personalized therapeutic strategies. Our findings reveal a critical role for HPDL in coordinating cortical progenitor proliferation, neurogenesis, and mitochondrial function, shedding light on a better understanding of the related clinical presentations.\n                  <\/jats:p>","DOI":"10.1038\/s41419-026-08476-9","type":"journal-article","created":{"date-parts":[[2026,2,20]],"date-time":"2026-02-20T09:37:49Z","timestamp":1771580269000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Loss of function variants in HPDL impair human cortical development via alterations of mitochondrial function"],"prefix":"10.1038","volume":"17","author":[{"given":"Matteo","family":"Baggiani","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2643-0650","authenticated-orcid":false,"given":"Maria Andrea","family":"Desbats","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valentina","family":"Naef","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michela","family":"Giacich","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniele","family":"Galatolo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Serena","family":"Mero","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sara","family":"Zampieri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2385-8320","authenticated-orcid":false,"given":"Valentina","family":"Cappello","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-0734-0005","authenticated-orcid":false,"given":"Agata","family":"Valentino","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Leonardo","family":"Salviati","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Filippo Maria","family":"Santorelli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2962-6296","authenticated-orcid":false,"given":"Devid","family":"Damiani","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,2,20]]},"reference":[{"key":"8476_CR1","doi-asserted-by":"publisher","first-page":"59","DOI":"10.1016\/B978-0-323-98817-9.00022-3","volume":"196","author":"JK Fink","year":"2023","unstructured":"Fink JK. 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