Researchers report they now can predict whether some parents are more likely than others to have a second child with the "isolated" form of cleft lip and palate, one of the worlds most common birth defects, according to results of a study published this week in the New England Journal of Medicine. The research was supported in part by the National Institute of Dental and Craniofacial Research and the National Institute of Environmental Health Sciences, part of the National Institutes of Health.
The authors say their latest gene test applies to about 12 percent of isolated cleft lip and palate, or babies born with clefts only and no other birth defects. Last year, the authors and their colleagues reported that mutations in another gene account for about 2 percent of all cases of isolated clefts, meaning researchers in the field now can collectively screen for about 15 percent of isolated cleft lip and palate, an impossibility just a few years ago. Isolated clefts account for 70 percent of all cleft lip and palate.
In the latest paper, the scientists report a so-called "haplotype" gene test, one of the first of its kind in medicine. A haplotype is the sum of several recurring variations in the usual DNA sequence of a species that are spaced out, like signposts, along a gene or chromosome. In this case, they found that distinct combinations of sequence variations in and around the gene IRF6 correlated with an increased chance that a child would be born with a cleft. IRF6, which encodes a gene-activating protein called a transcription factor, plays a role during development in orchestrating the normal formation of the lips, palate, skin, and genitalia.
Bob Kuska | EurekAlert!
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