Short answer · Medically reviewed summary · Last updated: 2026-05-08
TL;DR: Fraser syndrome is a rare, life-threatening genetic disorder characterized by the failure of the eyelids to separate (cryptophthalmos) and various developmental abnormalities involving the skin, kidneys, and genitalia. It is typically diagnosed at birth and requires a multidisciplinary medical approach to manage its complex physical manifestations. What are the primary clinical features of Fraser syndrome? Fraser syndrome is a multi-system developmental disorder.
What is Fraser Syndrome
What is Fraser Syndrome? Plain-language, medically reviewed definition plus the lived reality told by patients.
TL;DR: Fraser syndrome is a rare, life-threatening genetic disorder characterized by the failure of the eyelids to separate (cryptophthalmos) and various developmental abnormalities involving the skin, kidneys, and genitalia. It is typically diagnosed at birth and requires a multidisciplinary medical approach to manage its complex physical manifestations.
What are the primary clinical features of Fraser syndrome?
Fraser syndrome is a multi-system developmental disorder. The hallmark sign is cryptophthalmos, where the skin covers the eye, often resulting in partial or total vision loss. Because Fraser syndrome affects multiple organ systems during fetal development, infants may present with a range of symptoms, including:
- Renal agenesis (missing or underdeveloped kidneys)
- Syndactyly (webbing of fingers or toes)
- Genital malformations (such as ambiguous genitalia or cryptorchidism)
- Laryngeal stenosis (narrowing of the windpipe)
- Midline facial clefts
How common is Fraser syndrome and who is affected?
Fraser syndrome is extremely rare, with an estimated prevalence of approximately 1 in 200,000 to 1 in 500,000 live births. It affects both males and females equally, with no known predilection for specific geographic regions or ethnic groups. Because the condition is present from birth, the age of onset is neonatal. Within the DiseaseMaps.org community, 17 people are currently connected, highlighting the importance of shared experiences for those navigating this rare diagnosis.
What causes Fraser syndrome?
Fraser syndrome is an autosomal recessive condition, meaning an affected child must inherit one mutated gene copy from each parent. The underlying mechanism involves mutations in genes such as FRAS1, FREM2, or GRIP1. These genes are responsible for producing proteins that help stabilize the connection between the layers of the skin (the epidermis and dermis) during embryonic development. When these proteins are absent or dysfunctional, the normal separation of tissues—such as the eyelids—is disrupted.
What differentiates Fraser syndrome from other conditions?
While some disorders share features like syndactyly or renal issues, the combination of cryptophthalmos and specific genital abnormalities is the classic clinical presentation of Fraser syndrome. Unlike syndromes caused by chromosomal abnormalities, Fraser syndrome is a "genetic malformation syndrome" linked to specific structural protein failures.
Next steps
- Consult with a clinical geneticist to discuss inheritance patterns and family planning.
- Coordinate care through a multidisciplinary team including pediatric ophthalmologists, urologists, and neonatologists.
- Connect with the 17 families on DiseaseMaps.org to share resources and emotional support.
Medical disclaimer: This information is for educational purposes and should not replace professional medical advice, diagnosis, or treatment.
References
- NIH Genetic and Rare Diseases Information Center (GARD)
- Orphanet: The portal for rare diseases and orphan drugs
- OMIM (Online Mendelian Inheritance in Man) entry #219000
- PubMed: Clinical reviews on the genetic basis of Fraser syndrome
