"Cleft lip and cleft palate are among the most common birth defects in the United States," says Nancy S. Green, M.D., medical director of the March of Dimes, which helped fund the study. "This new finding brings us closer to understanding the multiple genetic factors underlying these very serious birth defects, with probable environmental effects."
The discovery also has important implications for genetic counseling for families who have had one or more children with an isolated cleft lip and/or cleft palate (not associated with any syndrome or other malformation), Dr. Green says.
"A special strength of this study is that its findings come from a variety of ethnic groups, including Europeans, South Americans, and Asians," Dr. Green says. "This gives us confidence that the linkage of this gene variant to oral clefts is true across different populations in the U.S. and worldwide."
The March of Dimes provided funding to Eduardo E. Castilla, M.D., Ph.D., Professor at ECLAMC, a genetic resource facility in Brazil, as well as to a collaboration between Andrew Lidral, D.D.S., Ph.D., Associate Professor, Department of Orthodontics, University of Iowa, Iowa City, and Mauricio Arcos-Burgos, M.D., Ph.D., at the University of Antioquia, Medellin, Colombia.
Cleft lip (with and without cleft palate) occurs in about 1 in every 1,000 births in the U.S., or more than 4,000 babies each year. A cleft is an opening or separation in a body structure. Clefts that occur in the oral-facial region often involve the upper lip, the roof of the mouth (hard palate), or the soft tissue in the back of the mouth (soft palate). More than 70 percent of babies with cleft lip also have cleft
Contact: Michele Kling
March of Dimes Birth Defects Foundation