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Here we describe a cohort of 34 individuals with likely pathogenic and pathogenic variants in <jats:italic>COL1A1<\/jats:italic> and <jats:italic>COL1A2<\/jats:italic>, 15 of whom have potential OIEDS1 (<jats:italic>n<\/jats:italic>\u00a0=\u20095) or OIEDS2 (<jats:italic>n<\/jats:italic>\u00a0=\u200910). A predominant OI phenotype and <jats:italic>COL1A1<\/jats:italic> frameshift variants are present in 4\/5 cases with potential OIEDS1. On the other hand, 9\/10 potential OIEDS2 cases have a predominant EDS phenotype, including four with an initial diagnosis of hypermobile EDS (hEDS). An additional case with a predominant EDS phenotype had a <jats:italic>COL1A1<\/jats:italic> arginine\u2010to\u2010cysteine variant that was originally misclassified as a variant of uncertain significance despite this type of variant being associated with classical EDS with vascular fragility. Vascular\/arterial fragility was observed in 4\/15 individuals (including one individual with an original diagnosis of hEDS), which underscores the unique clinical surveillance and management needs in these patients. In comparison to previously described OIEDS1\/2, we observed differentiating features that should be considered to refine currently proposed criteria for genetic testing in OIEDS, which will be beneficial for diagnosis and management. Additionally, these results highlight the importance of gene\u2010specific knowledge for informed variant classification and point to a potential genetic resolution (<jats:italic>COL1A2<\/jats:italic>) for some cases of clinically diagnosed hEDS.<\/jats:p>","DOI":"10.1002\/ajmg.c.32038","type":"journal-article","created":{"date-parts":[[2023,3,10]],"date-time":"2023-03-10T07:25:05Z","timestamp":1678433105000},"page":"147-159","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["<i>COL1A1<\/i> and <i>COL1A2<\/i> variants in <scp>Ehlers\u2010Danlos<\/scp> syndrome phenotypes and <scp>COL1<\/scp>\u2010related overlap disorder"],"prefix":"10.1002","volume":"193","author":[{"given":"Elise","family":"Venable","sequence":"first","affiliation":[{"name":"Department of Laboratory Medicine &amp; Pathology Mayo Clinic  Rochester Minnesota USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dacre R. 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