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Whether the pathogenic trinucleotide repeat expansion of the <jats:italic>HTT<\/jats:italic> gene causes neurodevelopmental abnormalities has garnered attention in both murine and human studies; however, documentation of discrete malformations in autopsy brains of HD individuals has yet to be described. We retrospectively searched the New York Brain Bank (discovery cohort) and an independent cohort (validation cohort) to determine whether developmental malformations are more frequently detected in HD versus non-HD brains and to document their neuropathologic features. One-hundred and thirty HD and 1600 non-HD whole brains were included in the discovery cohort and 720 HD and 1989 non-HD half brains were assessed in the validation cohort. Cases with developmental malformations were found at 6.4\u20138.2 times greater frequency in HD than in non-HD brains (discovery cohort: OR 8.68, 95% CI 3.48\u201321.63, <jats:italic>P<\/jats:italic>=4.8\u00a0\u00d7\u00a010<jats:sup>-5<\/jats:sup>; validation cohort: OR 6.50, 95% CI 1.83\u201323.17, <jats:italic>P<\/jats:italic>=0.0050). Periventricular nodular heterotopias (PNH) were the most frequent malformations and contained HTT and p62 aggregates analogous to the cortex, whereas cortical malformations with immature neuronal populations did not harbor such inclusions. HD individuals with malformations had heterozygous <jats:italic>HTT<\/jats:italic> CAG expansions between 40 and 52 repeats, were more frequently women, and all were asymmetric and focal, aside from one midline hypothalamic hamartoma. Using two independent brain bank cohorts, this large neuropathologic series demonstrates an increased occurrence of developmental malformations in HD brains. Since pathogenic <jats:italic>HTT<\/jats:italic> gene expansion is associated with genomic instability, one possible explanation is that neuronal precursors are more susceptible to somatic mutation of genes involved in cortical migration. Our findings further support emerging evidence that pathogenic trinucleotide repeat expansions of the <jats:italic>HTT<\/jats:italic> gene may impact neurodevelopment.<\/jats:p>","DOI":"10.1007\/s00401-021-02269-4","type":"journal-article","created":{"date-parts":[[2021,1,30]],"date-time":"2021-01-30T18:02:46Z","timestamp":1612029766000},"page":"399-413","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["Developmental malformations in Huntington disease: neuropathologic evidence of focal neuronal migration defects in a subset of adult brains"],"prefix":"10.1007","volume":"141","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8329-6083","authenticated-orcid":false,"given":"R. A.","family":"Hickman","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P. 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