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Van der Woude syndrome (VDWS) is a genetic disorder characterized by the combination of lower lip pits, cleft lip with or without cleft palate, and cleft palate alone (CP). The frequency of orofacial clefts ranges from 1:1000 to 1:500 births worldwide, and there are more than 400 syndromes that involve cleft lip with or without cleft palate. VWS is distinct from other clefting syndromes due to the combination of cleft lip and palate (CLP) and CP within the same family. Other features frequently associated with VWS include hypodontia in 10-81% of cases, narrow arched palate, congenital heart disease, heart murmur and cerebral abnormalities, syndactyly of the hands, polythelia, ankyloglossia, and adhesions between the upper and lower gum pads. The association between lower lip pits and cleft lip and/or palate was first described by Anne Van der Woude in 1954. The worldwide disease incidence ranges from 1:100,000 to 1:40,000. ==Genetics== Van der Woude syndrome is inherited as an autosomal dominant disease caused by a mutation in a single gene with equal distribution between the sexes. The disease has high penetrance at about 96% but the phenotypic expression varies from lower lip pits with cleft lip and cleft palate to no visible abnormalities.〔〔 Approximately 88% of VWS patients display lower lip pits, and in about 64% of cases lip pits are the only visible defect. Reported clefting covers a wide range including submucous cleft palate, incomplete unilateral CL, bifid uvula, and complete bilateral CLP. VWS is the most common orofacial clefting syndrome, accounting for 2% of CLP cases.〔 The majority of VWS cases are caused by haploinsufficiency due to mutations in the interferon regulatory factor 6 gene (''IRF6'') on chromosome 1 in the 1p32-p41 region known as VWS locus 1. A second, less common, causative locus is found at 1p34, known as VWS locus 2 (VWS2). More recent work has shown that GRHL3 is the VWS2 gene. ''Grhl3'' is downstream of ''Irf6'' in oral epithlium, suggesting a common molecular pathway leading to VWS. Prior work also suggested ''WDR65'' as a candidate gene.〔〔(), OMIM Van der Woude Syndrome 2〕 ''IRF6'' contains two non-coding and seven coding exons and is part of a family of nine transcription factors with a highly conserved helix-turn-helix DNA binding domain called the Smad-interferon regulatory factor binding domain (SMIR). Mutations in coding or non-coding ''IRF6'' exons can result in Van der Woude syndrome.〔 Due to the wide range of expressivity, it is also believed that other unidentified loci contribute to disease development.〔 An example of the clear phenotypic variability is a monozygotic twin study conducted by Jobling et al. (2010). Two monozygotic female twins had the same ''IRF6'' mutation; however Twin A was born with a bilateral cleft lip, whereas Twin B had bilateral lip pits and no orofacial clefting. Both twins were diagnosed with VWS. The twins' father had lip pits alone and a family history of CLP, CP, CL, and/or lip pits. Both twins were diagnosed with VWS. Polymerase chain reaction (PCR) amplification was done for all exons of ''IRF6'', and a missense mutation was discovered in exon 4. The tyrosine in the normal protein at this position is conserved across mammals, frogs, and chickens, so despite the fact that it was a previously unreported mutation, it was expected to be deleterious. This study is not the first case of different phenotypes occurring between monozygotic twins. Possible causes of phenotypic variability include variations in the intrauterine environment, epigenetic differences, or chance effects. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Van der Woude syndrome」の詳細全文を読む スポンサード リンク
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