Van der Woude Syndrome: Understanding Lip Pits and Cleft Development
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 17, 2026
Van der Woude syndrome is a rare genetic condition affecting mouth development, primarily characterized by lower lip pits and cleft lip or palate. Inherited through a mutation in the IRF6 gene, it affects approximately 1 in 35,000 to 100,000 people globally [1]. While it can cause feeding and speech challenges, surgical interventions for lip pits and clefts are highly effective, typically allowing children to lead full, healthy lives [1].
Quick Answer
Van der Woude syndrome (VWS) is a rare inherited disorder caused by a mutation in the IRF6 gene that disrupts facial development in the womb [1]. Its most common signs are lip pits on the lower lip and clefts of the lip or roof of the mouth [1]. Treatment involves a series of surgeries supplemented by speech and dental therapy.
What the research says
Lip pits and missing teeth are very common, and lip pits can reveal a hidden cleft. In a retrospective study of 22 people with VWS at the Australian Craniofacial Unit, lip pits were present in 86% and missing permanent teeth were reported in 86%; the authors note that a submucous cleft palate may go undiagnosed if the lower lip pits are not detected (Lam et al., Aust Dent J, 2010) [2].
Hypodontia and reduced upper-jaw growth are more marked than in other clefts. In a Swedish case-control study of 20 people with VWS, 20 with non-syndromic cleft lip and/or palate and 20 healthy controls, 90% of the VWS group had hypodontia compared with 60% of the non-syndromic cleft group, and maxillary length grew 0.3 mm during puberty in VWS versus 4 mm in the non-syndromic cleft group (Vesterbacka et al., Cleft Palate Craniofac J, 2026) [3].
What is Van der Woude Syndrome?
Van der Woude syndrome, also known as lip pit syndrome [1], is a rare genetic condition that alters how a child's mouth and face form during fetal development. Named after Dr. Anne Van der Woude, who studied the condition extensively in the 1950s, it is characterized by specific physical markers on the lower lip and oral cavity. The condition is uncommon, affecting between 1 in 35,000 and 1 in 100,000 individuals worldwide [1].
The hallmark of this syndrome is the presence of lip pits—small, sunken depressions or raised mounds—usually located on the lower lip. These pits often connect to underlying salivary or mucus glands, which can cause the lip to appear persistently moist or wet [1]. In many cases, these lip pits are accompanied by a cleft lip, a cleft palate, or both, which are openings that occur when facial tissues do not fuse correctly in the womb.
Figure 1: Anatomical illustration of Van der Woude syndrome features, including lower lip pits and cleft palate formation.
Genetic Causes and Inheritance
The primary cause of Van der Woude syndrome is a mutation in the IRF6 (interferon regulatory factor 6) gene. This gene is responsible for producing a protein essential for the proper formation of the head, face, skin, and genitals [1]. When this gene is mutated, protein levels are insufficient, leading to developmental irregularities in facial tissues [1].
Van der Woude syndrome follows an autosomal dominant inheritance pattern. This means a child only needs to inherit one copy of the mutated gene from one parent to develop the condition. A parent with the mutation has a 50% chance of passing it to each child [1]. While rare, some individuals may carry the gene mutation without exhibiting any physical symptoms.
Feature | Description |
Gene Involved | IRF6 (Interferon Regulatory Factor 6) |
Inheritance Pattern | Autosomal Dominant (50% transmission risk) |
Protein Function | Guides formation of head, face, skin, and genitals |
Result of Mutation | Reduced protein levels leading to facial tissue gaps |
Identifying Symptoms and Potential Complications
The symptoms of Van der Woude syndrome are primarily visible at birth, though some internal complications may emerge as the child grows. The physical presentation can vary significantly even among members of the same family who share the mutation.
Primary Physical Signs
Lip Pits: Small depressions or mounds on one or both sides of the lower lip [1].
Persistent Moisture: Saliva or mucus drainage from the lip pits.
Cleft Lip/Palate: Visible openings in the upper lip or the roof of the mouth.
Dental Issues: Missing teeth (hypodontia) [1] [2] or thin, underdeveloped tooth enamel (hypoplasia).
Associated Complications
Beyond physical appearance, the structural changes in the mouth can lead to functional challenges. Infants often face feeding difficulties before surgical repair. As children age, they may experience speech and language delays, developmental delays, or mild cognitive impairment [1].
Figure 2: Clinical checklist of Van der Woude syndrome symptoms and potential developmental complications.
Diagnostic Procedures
Diagnosis for Van der Woude syndrome can occur both before and after birth. Modern prenatal screening, such as high-resolution ultrasound, can often detect a cleft lip and sometimes a cleft palate while the baby is still in the womb [1]. If a cleft is suspected, further prenatal tests like chorionic villus sampling (CVS) or genetic amniocentesis can confirm the presence of the IRF6 mutation [1].
Postnatally, healthcare providers typically diagnose the condition through a physical examination of the lip pits and oral cavity. A genetic blood test is then performed to confirm the IRF6 mutation [1]. Because of the hereditary nature of the syndrome, genetic testing may also be recommended for the parents to understand the risk for future pregnancies.
Treatment and Management Pathways
The management of Van der Woude syndrome requires a multidisciplinary approach involving surgeons, speech therapists, and dentists. The primary goal is to restore function and appearance through a staged surgical timeline.
Surgical Timeline
Long-Term Support
Following surgery, many children require ongoing support. Speech-language therapy is essential for addressing communication delays, while regular dental check-ups are necessary to manage missing teeth or enamel issues. Genetic counseling is also a vital component for families to discuss inheritance risks and future family planning.
Figure 3: Clinical management pathway for Van der Woude syndrome, from prenatal screening to long-term therapy.
Clinical Comparison: VWS vs. PPS
Van der Woude syndrome shares genetic origins with Popliteal Pterygium Syndrome (PPS), as both are caused by IRF6 mutations [1]. However, PPS is significantly rarer and involves more extensive systemic symptoms.
Conclusion
Van der Woude syndrome is a complex but manageable genetic condition. Through early diagnosis and a structured surgical approach, the physical and functional challenges associated with lip pits and clefts can be effectively addressed. With the support of a multidisciplinary medical team, including genetic counselors and therapists, children with this syndrome typically achieve excellent long-term outcomes.
Clinical Urgency: If your child exhibits severe difficulty with feeding, breathing, or swallowing, contact your healthcare provider immediately for an urgent evaluation.
Frequently Asked Questions
What is the most common sign of Van der Woude syndrome?
The most distinctive sign is the presence of small depressions or mounds on the lower lip, known as lip pits. These are often accompanied by a cleft lip or palate.
Can Van der Woude syndrome be detected during pregnancy?
Yes. Prenatal ultrasounds can often identify cleft lips, and genetic tests like amniocentesis can confirm the IRF6 gene mutation before birth.
Is surgery for Van der Woude syndrome successful?
Surgical repair for clefts and lip pits is generally very successful. Most children who undergo these procedures lead full, healthy lives with normal function.
How does the condition affect speech?
Structural openings in the palate can interfere with sound production. Many children require speech therapy after surgical repair to address language delays.
What causes the lip pits to look wet?
The lip pits are often connected to minor salivary or mucus glands. This connection allows fluid to flow to the surface, giving the pits a moist or wet appearance.
Can a child have the gene mutation but no symptoms?
Yes. While the syndrome is autosomal dominant, there are rare instances where an individual inherits the mutation but does not develop physical symptoms.
Are there dental problems associated with this syndrome?
Yes. Many children are born with missing teeth (hypodontia) or have underdeveloped tooth enamel (hypoplasia), requiring regular dental care.
What is the risk of passing the condition to a child?
A parent with the IRF6 mutation has a 50% chance of passing the gene to each child they have.
Is Van der Woude syndrome the same as a standard cleft lip?
No. While it includes clefts, the presence of lower lip pits and the specific IRF6 genetic mutation distinguish it from isolated cleft cases.
When should I contact a healthcare provider?
Seek medical advice if a child with the condition experiences significant difficulty breathing, feeding, swallowing, or speaking.
Related Reading
What Is Cleft Lip and Cleft Palate? Symptoms, Causes, Diagnosis and Treatment explains how cleft lip and cleft palate form and are treated.
Cleft Lip and Cleft Palate Surgery: Timing, Steps and Recovery explains when cleft repair surgery is done and what recovery involves.
Velopharyngeal Dysfunction: Understanding Speech and Palate Health explains the palate problem that can cause nasal-sounding speech after cleft repair.
Pierre Robin Syndrome: Symptoms, Causes, and Care Roadmap explains another birth condition that often includes a cleft palate.
References
Cleveland Clinic. Van der Woude Syndrome: Symptoms, Causes & Outlook. Cleveland Clinic. Last updated June 15, 2022. https://my.clevelandclinic.org/health/diseases/23314-van-der-woude-syndrome
Lam AK, David DJ, Townsend GC, et al. Van der Woude syndrome: dentofacial features and implications for clinical practice. Aust Dent J. 2010;55(1):51-58. PMID 20415912. https://doi.org/10.1111/j.1834-7819.2009.01178.x
Vesterbacka M, Parikakis K, Ganzer N, et al. Craniofacial Growth and Hypodontia in Individuals Born with Van der Woude Syndrome. Cleft Palate Craniofac J. 2026. PMID 42334064. https://doi.org/10.1177/10556656261463128
Medical disclaimer
The information provided in this article is for educational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
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