Van der Woude syndrome is a condition that affects the development of the face. Many people with this disorder are born with a cleft lip, a cleft palate (an opening in the upper lip or roof of the mouth), or both. Affected individuals usually have depressions (pits) near the center of the lower lip, which may appear moist due to the presence of salivary and mucous glands in the pits. Small mounds of tissue on the lower lip may also occur. In some cases, people with van der Woude syndrome have missing teeth.
People with van der Woude syndrome who have cleft lip and/or palate, like other individuals with these facial conditions, have an increased risk of delayed language development, learning disabilities, or other mild cognitive problems. The average IQ of individuals with van der Woude syndrome is not significantly different from that of the general population.
Van der Woude syndrome is believed to occur in 1 in 35,000 to 1 in 100,000 people, based on data from Europe and Asia. Van der Woude syndrome is the most common cause of cleft lip and palate resulting from variations in a single gene, and this condition accounts for approximately 1 in 50 such cases.
Mutations in the IRF6 gene cause van der Woude syndrome. The IRF6 gene provides instructions for making a protein that plays an important role in early development. This protein is a transcription factor, which means that it attaches (binds) to specific regions of DNA and helps control the activity of particular genes.
The IRF6 protein is active in cells that give rise to tissues in the head and face. It is also involved in the development of other parts of the body, including the skin and genitals.
Mutations in the IRF6 gene that cause van der Woude syndrome prevent one copy of the gene in each cell from making any functional protein. A shortage of the IRF6 protein affects the development and maturation of tissues in the face, resulting in the signs and symptoms of van der Woude syndrome.
This condition is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In most cases, an affected person has one parent with the condition. Occasionally, an individual who has a copy of the altered gene does not show any signs or symptoms of the disorder.
Other Names for This Condition
- cleft lip and/or palate with mucous cysts of lower lip
- lip-pit syndrome
Additional Information & Resources
Genetic Testing Information
Genetic and Rare Diseases Information Center
Catalog of Genes and Diseases from OMIM
Scientific Articles on PubMed
- Ghassibé M, Revencu N, Bayet B, Gillerot Y, Vanwijck R, Verellen-Dumoulin C, Vikkula M. Six families with van der Woude and/or popliteal pterygium syndrome: all with a mutation in the IRF6 gene. J Med Genet. 2004 Feb;41(2):e15. Citation on PubMed or Free article on PubMed Central
- Kondo S, Schutte BC, Richardson RJ, Bjork BC, Knight AS, Watanabe Y, Howard E, de Lima RL, Daack-Hirsch S, Sander A, McDonald-McGinn DM, Zackai EH, Lammer EJ, Aylsworth AS, Ardinger HH, Lidral AC, Pober BR, Moreno L, Arcos-Burgos M, Valencia C, Houdayer C, Bahuau M, Moretti-Ferreira D, Richieri-Costa A, Dixon MJ, Murray JC. Mutations in IRF6 cause Van der Woude and popliteal pterygium syndromes. Nat Genet. 2002 Oct;32(2):285-9. Epub 2002 Sep 3. Citation on PubMed or Free article on PubMed Central
- Nopoulos P, Richman L, Andreasen N, Murray JC, Schutte B. Cognitive dysfunction in adults with Van der Woude syndrome. Genet Med. 2007 Apr;9(4):213-8. Citation on PubMed
- Nopoulos P, Richman L, Andreasen NC, Murray JC, Schutte B. Abnormal brain structure in adults with Van der Woude syndrome. Clin Genet. 2007 Jun;71(6):511-7. Citation on PubMed
- Rizos M, Spyropoulos MN. Van der Woude syndrome: a review. Cardinal signs, epidemiology, associated features, differential diagnosis, expressivity, genetic counselling and treatment. Eur J Orthod. 2004 Feb;26(1):17-24. Review. Citation on PubMed
- Schutte BC, Saal HM, Goudy S, Leslie E. IRF6-Related Disorders. 2003 Oct 30 [updated 2014 Jul 3]. In: Adam MP, Ardinger HH, Pagon RA, Wallace SE, Bean LJH, Stephens K, Amemiya A, editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2020. Available from http://www.ncbi.nlm.nih.gov/books/NBK1407/ Citation on PubMed