{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,15]],"date-time":"2026-01-15T04:09:29Z","timestamp":1768450169594,"version":"3.49.0"},"reference-count":57,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2011,8,10]],"date-time":"2011-08-10T00:00:00Z","timestamp":1312934400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American J of Med Genetics Pt A"],"published-print":{"date-parts":[[2011,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Isolated clubfoot is a relatively common birth defect that affects approximately 4,000 newborns in the US each year. Calf muscles in the affected leg(s) are underdeveloped and remain small even after corrective treatment. This observation suggests that variants in genes that influence muscle development are priority candidate risk factors for clubfoot. This contention is further supported by the discovery that mutations in genes that encode components of the muscle contractile complex (<jats:italic>MYH3<\/jats:italic>, <jats:italic>TPM2<\/jats:italic>, <jats:italic>TNNT3<\/jats:italic>, <jats:italic>TNNI2<\/jats:italic>, and <jats:italic>MYH8<\/jats:italic>) cause congenital contractures, including clubfoot, in distal arthrogryposis (DA) syndromes. Interrogation of 15 genes encoding proteins that control myofiber contractility in a cohort of both non\u2010Hispanic White (NHW) and Hispanic families, identified positive associations (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05) with SNPs in 12 genes; only 1 was identified in a family\u2010based validation dataset. Six SNPs in <jats:italic>TNNC2<\/jats:italic> deviated from Hardy\u2013Weinberg equilibrium in mothers in our NHW discovery dataset. Relative risk and likelihood ratio tests showed evidence for a maternal genotypic effect with <jats:italic>TNNC2\/<\/jats:italic>rs383112 and an inherited\/child genotypic effect with two SNPs, <jats:italic>TNNC2\/<\/jats:italic>rs4629 and rs383112. Associations with multiple SNPs in <jats:italic>TPM1<\/jats:italic> were identified in the NHW discovery (rs4075583, <jats:italic>P<\/jats:italic>\u2009=\u20090.01), family\u2010based validation (rs1972041, <jats:italic>P<\/jats:italic>\u2009=\u20090.000074), and case\u2013control validation (rs12148828, <jats:italic>P<\/jats:italic>\u2009=\u20090.04) datasets. Gene interactions were identified between multiple muscle contraction genes with many of the interactions involving at least one potential regulatory SNP. Collectively, our results suggest that variation in genes that encode contractile proteins of skeletal myofibers may play a role in the etiology of clubfoot. \u00a9 2011 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ajmg.a.34167","type":"journal-article","created":{"date-parts":[[2011,8,10]],"date-time":"2011-08-10T20:56:23Z","timestamp":1313009783000},"page":"2170-2179","source":"Crossref","is-referenced-by-count":35,"title":["Variants in genes that encode muscle contractile proteins influence risk for isolated clubfoot"],"prefix":"10.1002","volume":"155","author":[{"given":"Katelyn S.","family":"Weymouth","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Susan H.","family":"Blanton","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael J.","family":"Bamshad","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anita 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