American Journal of Epidemiology Advance Access originally published online on February 22, 2006
American Journal of Epidemiology 2006 163(9):790-810; doi:10.1093/aje/kwj103
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Human Genome Epidemiology (HuGE) Review |
Association between the Transforming Growth Factor Alpha Gene and Nonsyndromic Oral Clefts: A HuGE Review
From the Department of Oral Medicine and Pathology, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA
Correspondence to Dr. Alexandre R. Vieira, 614 Salk Hall, Department of Oral Medicine and Pathology, School of Dental Medicine, University of Pittsburgh, 3501 Terrace Street, Pittsburgh, PA 15261 (e-mail: arv11{at}dental.pitt.edu).
Transforming growth factor alpha (TGFA) is a well-characterized mammalian growth factor. Since the first report of an association between DNA sequence variants at the TGFA genetic locus and nonsyndromic oral clefts, 47 studies have been carried out, producing conflicting results. In this review, the author synthesizes findings from published reports on the association between the TGFA gene and clefting in humans. Bias, lack of statistical power, and genuine population diversity can explain the diverse results. In the aggregate, TGFA is probably a genetic modifier of clefting in humans, which is consistent with the oligogenic model suggested for nonsyndromic oral clefts.
cleft lip; cleft palate; epidemiology; genetics; TGFA; transforming growth factor alpha
Abbreviations: CI, confidence interval; FGFR1, fibroblast growth factor receptor 1; IRF6, interferon regulatory factor 6; LOD, logarithm of the odds; MSX1, muscle segment homeobox 1; MTHFR, 5,10-methylenetetrahydrofolate reductase; PAX9, paired box 9; PCR, polymerase chain reaction; TGFA, transforming growth factor alpha; TGFB3, transforming growth factor beta 3
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