SCIENTIFIC BACKGROUND

FGFR2

Crouzon syndrome occurs with a frequency of approx. 1:63,000 and accounts for around 5% of all craniosynostoses. The coronal suture is usually affected, also in combination with other suture synostoses. This usually results in brachycephaly. The short anterior cranial fossa leads to exophthalmos, often with strabismus. Visual acuity may be impaired. The midface is also hypoplastic, with a prominent nose and moderate mandibular prognathism. Vertebral fusions in the cervical spine are reported to be present in approximately 30% of patients and mild hearing impairment in up to 50%. Hands and feet show no malformations; intelligence is usually normal.

 

Crouzon syndrome occurs sporadically in about 50% of cases and is familial in 50% of cases. Various changes in the FGFR2 gene have been found to be the cause. In sporadic cases, these are only on the paternal allele, which, as in Apert syndrome, indicates a strong paternal age effect. Currently, only surgical treatment options are available.

 

A special form is Crouzon syndrome with acanthosis nigricans, which is caused by the Ala391Glu variant in the FGFR3 gene.

GENES

FGFR2
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