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Journal of Dental Research
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Clinical

Genetic Predisposition to External Apical Root Resorption in Orthodontic Patients: Linkage of Chromosome-18 Marker

R.A. Al-Qawasmi1, J.K. Hartsfield, Jr.1,2,*, E.T. Everett1, L. Flury2, L. Liu2, T.M. Foroud2, J.V. Macri1 and W.E. Roberts1

1 Department of Oral Facial Development, Indiana University School of Dentistry, 1121 West Michigan Street, Indianapolis, IN 46202-5186, USA;
2 Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA;

Correspondence: * corresponding author, jhartsfi{at}iupui.edu

External apical root resorption (EARR) is a common orthodontic treatment sequela. Previous studies implicate a substantial genetic component for EARR. Using a candidate gene approach, we investigated possible linkage of EARR associated with orthodontic treatment with the TNSALP, TNF{alpha}, and TNFRSF11A gene loci. The sample was comprised of 38 American Caucasian families with a total of 79 siblings who completed comprehensive orthodontic treatment. EARR was assessed by means of pre- and post-treatment radiographs. Buccal swab cells were collected for extraction and analysis of DNA. No evidence of linkage was found with EARR and the TNF{alpha} and TNSALP genes. Non-parametric sibling pair linkage analysis identified evidence of linkage (LOD = 2.5; p = 0.02) of EARR affecting the maxillary central incisor with the microsatellite marker D18S64 (tightly linked to TNFRSF11A). This indicates that the TNFRSF11A locus, or another tightly linked gene, is associated with EARR.

Key Words: linkage • chromosome 18 • RANK • root resorption • orthodontics

Journal of Dental Research, Vol. 82, No. 5, 356-360 (2003)
DOI: 10.1177/154405910308200506
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