{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T20:01:00Z","timestamp":1790712060000,"version":"4.1.0"},"reference-count":66,"publisher":"Public Library of Science (PLoS)","issue":"5","license":[{"start":{"date-parts":[[2021,5,11]],"date-time":"2021-05-11T00:00:00Z","timestamp":1620691200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["NS063273"],"award-info":[{"award-number":["NS063273"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Conquer Chiari"},{"name":"Conquer Chiari"},{"DOI":"10.13039\/100008054","name":"Fundaci\u00f3n Ram\u00f3n Areces","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100008054","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:p>Chiari Malformation Type 1 (CM-1) is characterized by herniation of the cerebellar tonsils below the foramen magnum and the presence of headaches and other neurologic symptoms. Cranial bone constriction is suspected to be the most common biologic mechanism leading to CM-1. However, other mechanisms may also contribute, particularly in the presence of connective tissue disorders (CTDs), such as Ehlers Danlos Syndrome (EDS). Accumulating data suggest CM-1 with connective tissue disorders (CTD+) may have a different patho-mechanism and different genetic risk factors than CM-1 without CTDs (CTD-). To identify CM-1 genetic risk variants, we performed whole exome sequencing on a single large, multiplex family from Spain and targeted sequencing on a cohort of 186 unrelated adult, Caucasian females with CM-1. Targeted sequencing captured the coding regions of 21 CM-1 and EDS candidate genes, including two genes identified in the Spanish family. Using gene burden analysis, we compared the frequency of rare, functional variants detected in CM-1 cases versus publically available ethnically-matched controls from gnomAD. A secondary analysis compared the presence of rare variants in these genes between CTD+ and CTD- CM-1 cases. In the Spanish family, rare variants co-segregated with CM-1 in <jats:italic>COL6A5<\/jats:italic>, <jats:italic>ADGRB3<\/jats:italic> and <jats:italic>DST<\/jats:italic>. A variant in <jats:italic>COL7A1<\/jats:italic> was present in affected and unaffected family members. In the targeted sequencing analysis, rare variants in six genes (<jats:italic>COL7A1<\/jats:italic>, <jats:italic>COL5A2<\/jats:italic>, <jats:italic>COL6A5<\/jats:italic>, <jats:italic>COL1A2<\/jats:italic>, <jats:italic>VEGFB<\/jats:italic>, <jats:italic>FLT1<\/jats:italic>) were significantly more frequent in CM-1 cases compared to public controls. In total, 47% of CM-1 cases presented with rare variants in at least one of the four significant collagen genes and 10% of cases harbored variants in multiple significant collagen genes. Moreover, 26% of CM-1 cases presented with rare variants in the <jats:italic>COL6A5<\/jats:italic> gene. We also identified two genes (<jats:italic>COL7A1<\/jats:italic>, <jats:italic>COL3A1<\/jats:italic>) for which the burden of rare variants differed significantly between CTD+ and CTD- CM-1 cases. A higher percentage of CTD+ patients had variants in <jats:italic>COL7A1<\/jats:italic> compared to CTD+ patients, while CTD+ patients had fewer rare variants in <jats:italic>COL3A1<\/jats:italic> than did CTD- patients. In summary, rare variants in several collagen genes are particularly frequent in CM-1 cases and those in <jats:italic>COL6A5<\/jats:italic> co-segregated with CM-1 in a Spanish multiplex family. <jats:italic>COL6A5<\/jats:italic> has been previously associated with musculoskeletal phenotypes, but this is the first association with CM-1. Our findings underscore the contribution of rare genetic variants in collagen genes to CM-1, and suggest that CM-1 in the presence and absence of CTD symptoms is driven by different genes.<\/jats:p>","DOI":"10.1371\/journal.pone.0251289","type":"journal-article","created":{"date-parts":[[2021,5,11]],"date-time":"2021-05-11T17:50:00Z","timestamp":1620755400000},"page":"e0251289","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":21,"title":["Rare functional genetic variants in COL7A1, COL6A5, COL1A2 and COL5A2 frequently occur in Chiari Malformation Type 1"],"prefix":"10.1371","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8458-1209","authenticated-orcid":true,"given":"Aintzane","family":"Urbizu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2302-6150","authenticated-orcid":true,"given":"Melanie E.","family":"Garrett","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0326-8443","authenticated-orcid":true,"given":"Karen","family":"Soldano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oliver","family":"Drechsel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dorothy","family":"Loth","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Marc\u00e9-Grau","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1548-5763","authenticated-orcid":true,"given":"Olga","family":"Mestres i Soler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3831-0536","authenticated-orcid":true,"given":"Maria A.","family":"Poca","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephan","family":"Ossowski","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7998-4185","authenticated-orcid":true,"given":"Alfons","family":"Macaya","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francis","family":"Loth","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rick","family":"Labuda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5409-9155","authenticated-orcid":true,"given":"Allison","family":"Ashley-Koch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2021,5,11]]},"reference":[{"key":"pone.0251289.ref001","first-page":"795","article-title":"Significance of cerebellar tonsillar position on MR","volume":"7","author":"A. 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