Microdeletions at chromosome bands 1q32-q41 as a cause of Van der Woude syndrome.
- Authors
- Schutte, B C; Basart, A M; Watanabe, Y; Laffin, J J; Coppage, K; Bjork, B C; Daack-Hirsch, S; Patil, S; Dixon, M J; Murray, J C
- Year
- 1999
- Journal
- American journal of medical genetics
- PMID
- 10323740
- DOI
- 10.1002/(sici)1096-8628(19990521)84:2<145::aid-ajmg11>3.0.co;2-l
Van der Woude syndrome (VWS) is an autosomal dominant disorder comprising cleft lip and/or cleft palate and lip pits. We reported previously a family whose underlying mutation is a 500-800 kb deletion localized to chromosome bands 1q32-q41 [Sander et al., 1994: Hum Mol Genet 3:576-578]. Along with cleft lip/palate and lip pits, affected relatives exhibit developmental delays, suggesting that the function of a gene nearby may also be disrupted. To further localize the VWS gene we searched for other deletions that cause VWS. An allele loss assay was performed using a novel highly polymorphic marker, D1S3753. From a panel of 37 unrelated individuals, we detected an allele loss in one family, indicating the presence of a deletion. In this family, the phenotype in three generations of affected individuals was confined to the cardinal signs of VWS. Surprisingly, mapping of the new deletion showed that it extended 0.2-1 Mb beyond the proximal breakpoint for the deletion described previously. No deletions were detected in seven cases of popliteal pterygia syndrome, 76 cases of mixed syndromic forms of cleft lip and palate, and 178 cases of nonsyndromic cleft lip and palate. These observations suggest that genetic searches for microdeletions should be routine in screening patients for causes of VWS and may facilitate the positional cloning efforts of the VWS gene and of a nearby gene or genes that may be involved in brain development.
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