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Pfeiffer syndrome
Pfeiffer syndrome is a rare genetic disorder that causes premature fusion of certain skull bones (craniosynostosis), wide-set eyes, and distinct hand and foot abnormalities. It can affect individuals from birth, with varying severity.
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Overview
Pfeiffer syndrome is a rare genetic condition present from birth, primarily characterised by the premature fusion of certain bones in the skull, known as craniosynostosis [PMID:28773727]. This early fusion can affect the shape of the head and face, and may sometimes impact brain growth. In addition to the skull, individuals with Pfeiffer syndrome often have distinctive features affecting their hands and feet, such as broad thumbs and big toes. The severity of Pfeiffer syndrome can vary widely among affected individuals, even within the same family.
Symptoms & clinical features
The primary clinical features of Pfeiffer syndrome include craniosynostosis, which can lead to a tall, prominent forehead, a flattened mid-face, and wide-set, bulging eyes. The premature fusion of skull bones can restrict the normal growth of the brain and sometimes lead to increased pressure inside the skull [PMID:17912440]. Beyond the head and face, individuals typically have abnormalities of the hands and feet. These commonly include broad thumbs and big toes, which may also be unusually short or bent. In some cases, there can be webbing between fingers or toes (syndactyly). Other potential features can include hearing loss and dental problems. The specific combination and severity of these symptoms can differ significantly between individuals.
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Affected organs
Pfeiffer syndrome predominantly affects the skeletal system, particularly the bones of the skull, face, hands, and feet. The premature fusion of skull bones can impact the brain by limiting its space for growth, potentially leading to developmental concerns. The eyes may be affected by their wide-set positioning and prominence, which can sometimes lead to issues with vision. Ear development can also be atypical, contributing to hearing difficulties in some individuals. Dental structures may also show anomalies.
Risks & severity
The severity of Pfeiffer syndrome can range from mild, with primarily cosmetic concerns, to severe, involving significant medical complications [PMID:28773727]. The most serious risks are associated with severe craniosynostosis and increased pressure on the brain, which can potentially affect cognitive development. Airway problems and hearing loss are also important considerations. The exact prevalence of Pfeiffer syndrome is not well established, but research suggests it occurs in approximately 1 in 100,000 live births. The condition is present from birth, and its features are typically noticeable early in life.
Genetic causes
Pfeiffer syndrome is caused by pathogenic variants in the FGFR2 gene. This gene provides instructions for making the fibroblast growth factor receptor 2 protein. This protein is vital for various cellular processes, including cell development, bone formation, and tissue repair [PMID:17912440]. Specifically, FGFR2 plays a crucial role in signalling pathways that regulate bone growth and development during foetal life. When a pathogenic variant occurs in FGFR2, it can lead to the protein being overactive or functioning incorrectly. This abnormal signalling disrupts the normal process of bone formation, resulting in the premature fusion of skull bones and the characteristic hand and foot abnormalities seen in Pfeiffer syndrome.
- FGFR2 fibroblast growth factor receptor 2The FGFR2 gene provides instructions for fibroblast growth factor receptor 2, a protein vital for cellular processes including growth, division, differentiation, and bone development.
Inheritance pattern
Pfeiffer syndrome is inherited in an autosomal dominant pattern. This means that a person only needs to inherit one copy of the altered FGFR2 gene to develop the condition. If a parent has Pfeiffer syndrome, there is a 50% chance with each pregnancy that their child will also inherit the condition. In many cases, however, Pfeiffer syndrome results from a new (de novo) genetic change in the FGFR2 gene that occurs for the first time in the affected individual and is not inherited from either parent. In such instances, the parents typically do not have the condition and the chance of having another child with Pfeiffer syndrome is low, though genetic counselling can provide precise recurrence risk assessment.
Each child has a 50% chance of inheriting the pathogenic variant, regardless of sex.
Diagnosis & testing
Diagnosis of Pfeiffer syndrome is typically based on clinical examination of the characteristic features, including craniosynostosis and the distinctive hand and foot abnormalities. Imaging studies, such as X-rays and CT scans, are used to confirm the skull bone fusion and assess brain development. Genetic testing can confirm a diagnosis by identifying pathogenic variants in the FGFR2 gene [PMID:17912440]. Referral for genetic testing in the UK is usually made by a specialist paediatrician or clinical geneticist. These referrals are part of the NHS Genomic Medicine Service (GMS) pathway, which often includes specific R-codes for rare disease testing.
Management & lifestyle
Management of Pfeiffer syndrome focuses on addressing the specific symptoms and potential complications, often involving a multidisciplinary team of specialists. Surgical intervention is frequently required to correct craniosynostosis, relieve pressure on the brain, and reshape the skull and face, particularly in infancy or early childhood. Ongoing monitoring for brain pressure, hearing, and vision is important. Occupational therapy and physical therapy may be beneficial for hand and foot function. Regular follow-up with clinical geneticists, neurosurgeons, craniofacial surgeons, ophthalmologists, and audiologists is generally part of the care pathway. Genetic counsellors can provide essential support and information regarding inheritance and family planning.
UK care pathway
In the UK, individuals with suspected Pfeiffer syndrome would typically be referred by their GP or paediatrician to specialist services within the NHS Genomic Medicine Service. This pathway often involves assessment by a clinical genetics team who can arrange appropriate genetic testing, usually under specific R-codes related to craniofacial conditions. Genetic counsellors play a vital role, providing information about the condition, its inheritance, and support for families. Care is often coordinated through regional craniofacial centres.
Frequently asked questions
What is craniosynostosis?
Craniosynostosis is a condition where one or more of the fibrous joints between the bones of a baby's skull (sutures) close prematurely. This can affect the shape of the head and may, in some cases, restrict the growth of the brain.
Is Pfeiffer syndrome always inherited from a parent?
No, not always. While it can be inherited in an autosomal dominant pattern if a parent has the condition, many cases of Pfeiffer syndrome occur due to a new genetic change that happens for the first time in the affected individual. This is known as a de novo variant.
What kind of doctors treat Pfeiffer syndrome?
Management often involves a team of specialists including clinical geneticists, neurosurgeons for skull surgeries, craniofacial surgeons for facial reconstruction, ophthalmologists for eye care, and audiologists for hearing issues. Occupational and physical therapists may also be involved.
Can Pfeiffer syndrome be detected before birth?
In some cases, features of craniosynostosis or limb abnormalities associated with Pfeiffer syndrome may be identified during prenatal ultrasound scans. Genetic testing can be offered during pregnancy if there is a family history or specific concerns.
Will my child's development be affected by Pfeiffer syndrome?
The impact on development varies significantly. In some individuals, particularly those with more severe craniosynostosis and increased pressure on the brain, developmental delays can occur. Regular monitoring and early intervention are key parts of care.