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Testing candidate genes for non-syndromic oral clefts using a case-parent trio design
Terri H Beaty1, J B Hetmanski, J S Zeiger
1Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, 615 N. Wolfe Street, Baltimore, MD 21205, USA. tbeaty@jhsph.edu
Genetic Epidemiology
|January 5, 2002
Summary
Genetic analysis of oral clefts identified transforming growth factor beta3 (TGFbeta3) and MSX1 as key genes. MSX1 showed interaction with maternal smoking, suggesting independent contributions to cleft risk.
Area of Science:
- Genetics
- Developmental Biology
- Public Health
Background:
- Oral clefts are common birth defects with complex etiology.
- Genetic and environmental factors are implicated in non-syndromic oral cleft development.
Purpose of the Study:
- To investigate the role of candidate genes in isolated, non-syndromic oral clefts.
- To examine gene-gene and gene-environment interactions in oral cleft etiology.
Main Methods:
- Case-parent trio study design with 269 participants.
- Analysis of markers in five candidate genes, including transforming growth factor beta3 (TGFbeta3) and MSX1.
- Statistical tests for linkage, disequilibrium, heterogeneity, and gene-environment interaction.
Main Results:
- Transforming growth factor beta3 (TGFbeta3) and MSX1 showed significant evidence of linkage and disequilibrium.
- MSX1 indicated heterogeneity across oral cleft types and interaction with maternal smoking.
- No significant gene-gene interaction was detected between TGFbeta3 and MSX1.
Conclusions:
- TGFbeta3 and MSX1 are independently associated with the risk of isolated, non-syndromic oral clefts.
- Maternal smoking may modify the effect of MSX1 on oral cleft risk.
