Linkage and Identification of (a) Candidate Gene(s) for Tooth Disorders

The recruitment status of this study is unknown because the information has not been verified recently.
Verified December 2003 by National Center for Research Resources (NCRR).
Recruitment status was  Recruiting
Sponsor:
Information provided by:
National Center for Research Resources (NCRR)
ClinicalTrials.gov Identifier:
NCT00026026
First received: November 6, 2001
Last updated: June 23, 2005
Last verified: December 2003
  Purpose

The congenital absence of teeth, commonly referred to as hypodontia or tooth agenesis, is a common developmental anomaly of human dentition that affects approximately 20% of the population. Although new genetic and molecular approaches in humans and mice have increased our understanding of the molecules that control tooth patterning (number, position, shape and size), the precise nature of the genes involved in hypodontia in humans is poorly understood. Hence, understanding the molecular basis for missing teeth is an issue of paramount importance that is both timely and significant to the practice of dentistry. So far, only two genes have been associated with non-syndromic familial tooth agenesis: MSX1 and PAX9. Substitution mutations in the homeodomain region of MSX1 were linked to premolar agenesis while an insertion mutation in the paired box domain of PAX9 was shown to be responsible for molar oligodontia.

The long-term goals of this research are to elucidate the molecular pathology of human tooth agenesis, in particular, to evaluate whether genes other than MSX1 and PAX9 (locus heterogeneity) are involved. Alternatively, as in the case of MSX1, it will be interesting to know whether allelic variations, different mutations in these genes, are associated with tooth agenesis. We propose to study a potentially large kindred that report the developmental absence of several posterior teeth. The fundamental hypothesis to be tested states that the gene responsible for the congenital absence of molar teeth in this kindred is a critical element in the genesis of molars. The specific goals are to perform linkage analysis followed by direct sequencing of PCR products to identify the gene and to characterize the nature of the underlying defect. Identifying the underlying gene defect in this family affected by tooth agenesis will add new knowledge to our understanding of the pathogenesis of this defect and will provide the basis for future studies.


Condition
Anodontia

Study Type: Observational
Study Design: Primary Purpose: Screening
Time Perspective: Cross-Sectional
Official Title: Linkage and Identification of (a) Candidate Gene(s) for Tooth Disorders

Resource links provided by NLM:


Further study details as provided by National Center for Research Resources (NCRR):

  Eligibility

Ages Eligible for Study:   5 Years to 80 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Criteria
  • Patients affected with non-syndromic tooth agenesis and non-affected family members
  Contacts and Locations
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Please refer to this study by its ClinicalTrials.gov identifier: NCT00026026

Locations
United States, North Carolina
University of North Carolina at Chapel Hill Recruiting
Chapel Hill, North Carolina, United States, 27599
Contact: Sylvia A Frazier-Bowers, DDS, PhD    919-966-9255    sylvia_frazier@dentistry.unc.edu   
Sponsors and Collaborators
  More Information

No publications provided

ClinicalTrials.gov Identifier: NCT00026026     History of Changes
Other Study ID Numbers: NCRR-M01RR02558-0173
Study First Received: November 6, 2001
Last Updated: June 23, 2005
Health Authority: United States: Federal Government

Keywords provided by National Center for Research Resources (NCRR):
Human tooth agenesis

Additional relevant MeSH terms:
Tooth Diseases
Anodontia
Stomatognathic Diseases
Tooth Abnormalities
Stomatognathic System Abnormalities
Congenital Abnormalities

ClinicalTrials.gov processed this record on August 20, 2014