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The spectrum presents with heterogeneous clinical features and complex etiology with genetic factors not yet completely understood. To date, <jats:italic>MYT1<\/jats:italic> is the most important gene unambiguously associated with the spectrum and with functional data confirmation. In this work, we aimed to identify new single nucleotide variants (SNVs) affecting <jats:italic>MYT1<\/jats:italic> in a cohort of 73 Brazilian patients diagnosed with OAVS. In addition, we investigated copy number variations (CNVs) encompassing this gene or its cis\u2010regulatory elements and compared the frequency of these events in patients versus a cohort of 455 Brazilian control individuals. A new SNV, predicted as likely deleterious, was identified in five unrelated patients with OAVS. All five patients presented hearing impairment and orbital asymmetry suggesting an association with the variant. CNVs near <jats:italic>MYT1<\/jats:italic>, located in its neighboring topologically associating domain (TAD), were found to be enriched in patients when compared to controls, indicating a possible involvement of this region with OAVS pathogenicity. Our findings highlight the genetic complexity of the spectrum that seems to involve more than one variant type and inheritance patterns.<\/jats:p>","DOI":"10.1002\/ajmg.a.62217","type":"journal-article","created":{"date-parts":[[2021,4,22]],"date-time":"2021-04-22T00:44:53Z","timestamp":1619052293000},"page":"2056-2064","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Novel <scp><i>MYT1<\/i><\/scp> variants expose the complexity of oculo\u2010auriculo\u2010vertebral spectrum genetic mechanisms"],"prefix":"10.1002","volume":"185","author":[{"given":"Mal\u00fa","family":"Zamariolli","sequence":"first","affiliation":[{"name":"Division of Genetics, Department of Morphology and Genetics Universidade Federal de S\u00e3o Paulo  S\u00e3o Paulo Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bruna","family":"Burssed","sequence":"additional","affiliation":[{"name":"Division of Genetics, Department of 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