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Recent advances in brain organoid models offer a more physiologically relevant platform for studying PD, however, iPSC\u2010derived brain organoids require long maturation times and may not accurately represent the aged brain's epigenetics and cellular contexts, limiting their applicability for modeling late\u2010onset diseases like PD. In this study, a novel approach for generating 3D\u2010induced dopaminergic (iDA) neuron organoids directly from human fibroblasts is presented. It is confirmed that these 3D iDA organoids more closely resemble the aged human brain and accurately replicate PD pathologies. Furthermore, this model is extended by incorporating astrocytes to create 3D iDA neuron\u2010astrocyte assembloids, recognizing the critical role of glial cells in neurodegenerative processes. It is identified that PD assembloids incorporating control astrocytes with A53T mutant iDAs demonstrated the neuroprotective effects of healthy astrocytes. In contrast, A53T mutant astrocytes progressively contributed to neuronal degeneration and synucleinopathy in 3D\u2010iDA assembloids. These findings suggest that directly converted 3D\u2010iDA organoids and assembloids provide a robust and physiologically relevant model for studying PD pathogenesis and evaluating therapeutic interventions.<\/jats:p>","DOI":"10.1002\/advs.202412548","type":"journal-article","created":{"date-parts":[[2025,2,18]],"date-time":"2025-02-18T14:59:47Z","timestamp":1739890787000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Parkinson's Disease Modeling Using Directly Converted 3D Induced Dopaminergic Neuron Organoids and Assembloids"],"prefix":"10.1002","volume":"12","author":[{"given":"Hongwon","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Chemistry Dongguk University  Pudong 1\u2010gil 30, Jung\u2010gu Seoul 04620 Republic of Korea"},{"name":"Department of Chemistry and Chemical Biology Rutgers The State University of New Jersey  Piscataway NJ 08854 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Soi","family":"Kang","sequence":"additional","affiliation":[{"name":"Department of Chemistry Dongguk University  Pudong 1\u2010gil 30, Jung\u2010gu Seoul 04620 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Byounggook","family":"Cho","sequence":"additional","affiliation":[{"name":"Department of Chemistry Dongguk University  Pudong 1\u2010gil 30, Jung\u2010gu Seoul 04620 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Saemin","family":"An","sequence":"additional","affiliation":[{"name":"Department of Chemistry Dongguk University  Pudong 1\u2010gil 30, Jung\u2010gu Seoul 04620 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yunkyung","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Chemistry Dongguk University  Pudong 1\u2010gil 30, Jung\u2010gu Seoul 04620 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3876-6020","authenticated-orcid":false,"given":"Jongpil","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Chemistry Dongguk University  Pudong 1\u2010gil 30, Jung\u2010gu Seoul 04620 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,2,18]]},"reference":[{"key":"e_1_2_9_1_1","first-page":"504","volume":"40","author":"DeMaagd G.","year":"2015","journal-title":"P. 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