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Journal of Dental Research, Vol 79, 1758-1764, Copyright © 2000 by International & American Associations for Dental Research Online Journals

ARTICLES

Evidence of genetic heterogeneity for hereditary gingival fibromatosis

T. C. Hart, D. Pallos, L. Bozzo, O. P. Almeida, M. L. Marazita, J. R. O'Connell and J. R. Cortelli
Division of Oral Biology, University of Pittsburgh School of Dental Medicine, PA 15261, USA. hart@cpc.pitt.edu

Hereditary Gingival Fibromatosis (HGF) is the most common genetic form of gingival fibromatosis. The condition is most frequently reported to be transmitted as an autosomal-dominant trait, but autosomal-recessive inheritance has also been reported. The clinical presentation of HGF is variable, both in the distribution (number of teeth involved) and in the degree (severity) of expression. It is unknown if the variable clinical expression of HGF in different families is due to variable expression of a common gene mutation, allelic mutations, or non-allelic mutations. The apparently different modes of Mendelian inheritance of HGF suggest genetic heterogeneity. A gene locus for HGF has been localized to a 37-cM genetic interval on chromosome 2p21-p22 (D2S1352, Zmax = 5.10, theta = 0.00) flanked by D2S1788 and D2S441. To evaluate the generality of this linkage, we tested linkage with 9 markers from this candidate region in another large family, segregating for an autosomal-dominant form of generalized HGF, and found no support for linkage with any of these markers. Furthermore, statistical tests of this apparent heterogeneity were highly significant. Analysis of these data provides direct evidence that at least two genetically distinct loci are responsible for autosomal-dominant hereditary gingival fibromatosis.


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