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We developed the <jats:italic>Pten<\/jats:italic><jats:sup><jats:italic>m3m4<\/jats:italic><\/jats:sup> mouse, where Pten is largely restricted from the nucleus, which recapitulates patient-like, autism-related phenotypes: behavioral changes, macrocephaly, and white matter abnormalities. This study aimed to investigate the contribution of oligodendrocyte (OL) lineage differentiation and functional changes in myelination to the white matter phenotype. OL lineage differentiation and myelination in <jats:italic>Pten<\/jats:italic><jats:sup><jats:italic>m3m4<\/jats:italic><\/jats:sup> mice was studied using immunohistochemical and electron microscopic analyses. We also used primary oligodendrocyte progenitor cells (OPCs) to determine the effect of the <jats:italic>Pten<\/jats:italic><jats:sup><jats:italic>m3m4<\/jats:italic><\/jats:sup> mutation on OPC proliferation, migration and maturation. Finally, we assessed the myelinating competency of mutant OLs via co-culture with wildtype dorsal root ganglia (DRG) neurons. The in vivo analyses of <jats:italic>Pten<\/jats:italic><jats:sup><jats:italic>m3m4\/m3m4<\/jats:italic><\/jats:sup> murine brains showed deficits in proteolipid protein (Plp) trafficking in myelinating OLs. Despite the increased expression of myelin proteins in the brain, myelin deposition was observed to be abnormal, often occurring adjacent to, rather than around axons. Mutant primary OPCs showed enhanced proliferation and migration. Furthermore, mutant OPCs matured precociously, exhibiting aberrant myelination in vitro. Mutant OPCs, when co-cultured with wildtype DRG neurons, showed an inability to properly ensheath axons. Our findings provide evidence that the <jats:italic>Pten<\/jats:italic><jats:sup><jats:italic>m3m4<\/jats:italic><\/jats:sup> mutation disrupts the differentiation and myelination programs of developing OLs. OL dysfunction in the <jats:italic>Pten<\/jats:italic><jats:sup><jats:italic>m3m4<\/jats:italic><\/jats:sup> model explains the leukodystrophy phenotype, a feature commonly associated with autism, and highlights the growing importance of glial dysfunction in autism pathogenesis.<\/jats:p>","DOI":"10.1038\/s41398-018-0364-7","type":"journal-article","created":{"date-parts":[[2019,1,21]],"date-time":"2019-01-21T11:02:40Z","timestamp":1548068560000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["Constitutional mislocalization of Pten drives precocious maturation in oligodendrocytes and aberrant myelination in model of autism spectrum disorder"],"prefix":"10.1038","volume":"9","author":[{"given":"Hyunpil","family":"Lee","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6050-409X","authenticated-orcid":false,"given":"Stetson","family":"Thacker","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicholas","family":"Sarn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8502-4455","authenticated-orcid":false,"given":"Ranjan","family":"Dutta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3693-5145","authenticated-orcid":false,"given":"Charis","family":"Eng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,1,17]]},"reference":[{"key":"364_CR1","doi-asserted-by":"publisher","DOI":"10.1176\/appi.books.9780890425596","volume-title":"Diagnostic and Statistical Manual of Mental Disorders","author":"American Psychiatric Association.","year":"2013","unstructured":"American Psychiatric Association. 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