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A novel mutation in the<\/jats:italic> AMELX <jats:italic>gene and multiple crown resorptions. \u2028Eur J Oral Sci 2011; 119 (Suppl. 1): 324\u2013328. \u00a9 2011 Eur J Oral Sci<\/jats:italic><\/jats:p><jats:p>Amelogenesis imperfecta (AI) is a heterogeneous group of genetic disorders with regard to genetic aetiology and clinical phenotype and affects tooth enamel with no other non\u2010oral syndromic conditions. X\u2010linked AI is caused by mutations in the amelogenin (<jats:italic>AMELX<\/jats:italic>) gene, the only AI candidate gene located on the X chromosome. To date, 15 mutations in the <jats:italic>AMELX<\/jats:italic> gene have been found to cause AI. We identified a proband with generalized hypoplastic enamel and unusual multiple crown resorption in premolars and molars. Pedigree analysis suggested an X\u2010linked hereditary pattern. We performed mutational analysis for the <jats:italic>AMELX<\/jats:italic> gene based on the candidate gene approach. Sequencing analysis revealed a novel mutation in exon 6 (g.4090delC, c.517delC, p.Pro173LeufsX16). This frameshift mutation produces a premature stop codon within exon 6 and is predicted to replace 33 amino acids at the C\u2010terminus with 15 novel amino acids if the mutant mRNA escapes the nonsense\u2010mediated decay system. Although crown resorptions occur frequently in patients with the hypoplastic type of A1, an association with the <jats:italic>AMELX<\/jats:italic> mutation has not been previously reported. We believe that these findings will broaden our understanding of the clinical phenotype and pathogenesis of X\u2010linked AI.<\/jats:p>","DOI":"10.1111\/j.1600-0722.2011.00858.x","type":"journal-article","created":{"date-parts":[[2012,1,13]],"date-time":"2012-01-13T18:56:16Z","timestamp":1326480976000},"page":"324-328","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["A novel mutation in the <i>AMELX<\/i> gene and multiple crown resorptions"],"prefix":"10.1111","volume":"119","author":[{"given":"Kyung\u2010Eun","family":"Lee","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sook\u2010Kyung","family":"Lee","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seung\u2010Eun","family":"Jung","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Su 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