Human Molecular Genetics Advance Access originally published online on January 13, 2004
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Human Molecular Genetics, 2004, Vol. 13, Review Issue 1 R73-R81
DOI: 10.1093/hmg/ddh052
Genetics of cleft lip and palate: syndromic genes contribute to the incidence of non-syndromic clefts
Institute of Reproductive and Developmental Biology, Imperial College London, London W12 0NN, UK
Clefts of the lip and/or palate (CL/P) are among the most common birth defects worldwide. The majority are non-syndromic where CL/P occurs in isolation of other phenotypes. Where one or more additional features are involved, clefts are refered to as syndromic. Collectively CL/P has a major clinical impact requiring surgical, dental, orthodontic, speech, hearing and psychological treatments or therapies throughout childhood. The etiology of CL/P is complex and thought to involve both major and minor genetic influences with variable interactions from environmental factors. Using a combination of gene targeting technology and traditional developmental techniques in both mouse and chick, significant progress has been made in the identification of numerous genes and gene pathways critical for craniofacial development. Despite this, it has been a particular source of frustration that mutation screening of specific candidates, association studies and even genome-wide scans have largely failed to reveal the molecular basis of human clefting. Nevertheless, some important findings have recently come from studies involving syndromic forms of the disorder. These include several genes which have now been shown to contribute a major effect on the etiology of CL/P. Furthermore, these genes can also be used to demonstrate a significant overlap between syndromic and non-syndromic CL/P. The study of these syndromic genes and their molecular pathways will provide a useful and informative route with which to gain a better understanding of human craniofacial pathology.
* To whom correspondence should be addressed: Tel: +44 2075942124; Fax: +44 2075942129; Email: pstanier{at}imperial.ac.uk
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