Crouzon syndrome

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Crouzon syndrome
Baby with Crouzon Syndrome.jpg
Baby with Crouzon syndrome
SpecialtyMedical genetics

Crouzon syndrome is an autosomal dominant genetic disorder known as a branchial arch syndrome. Specifically, this syndrome affects the first branchial (or pharyngeal) arch, which is the precursor of the maxilla and mandible. Since the branchial arches are important developmental features in a growing embryo, disturbances in their development create lasting and widespread effects.

This syndrome is named after Octave Crouzon,[1][2] a French physician who first described this disorder. He noted the affected patients were a mother and her daughter, implying a genetic basis. First called "craniofacial dysostosis", the disorder was characterized by a number of clinical features. This syndrome is caused by a mutation in the fibroblast growth factor receptor 2 (FGFR2), located on chromosome 10.

Breaking down the name, "craniofacial" refers to the skull and face, and "dysostosis" refers to malformation of bone. Now known as Crouzon syndrome, the characteristics can be described by the rudimentary meanings of its former name. What occurs is that an infant's skull and facial bones, while in development, fuse early or are unable to expand. Thus, normal bone growth cannot occur. Fusion of different sutures leads to abnormal patterns of growth of the skull.

Signs and symptoms[edit]

Child with Crouzon syndrome showing characteristic facial features.

A defining characteristic of Crouzon syndrome is craniosynostosis, which results in an abnormal head shape. This is present in combinations of: turricephaly, frontal bossing, trigonocephaly (fusion of the metopic suture), brachycephaly (fusion of the coronal suture), dolichocephaly (fusion of the sagittal suture), plagiocephaly (unilateral premature closure of lambdoid and coronal sutures), oxycephaly (fusion of coronal and lambdoidal sutures), and complex craniosynostosis (premature closure of some or all sutures).

Exophthalmos (bulging eyes due to shallow eye sockets after early fusion of surrounding bones), hypertelorism (greater than normal distance between the eyes), and psittichorhina (beak-like nose) are also very common features. Other facial characteristics that are present in many cases include external strabismus and hypoplastic maxilla (insufficient growth of the midface), which results in relative mandibular prognathism (protruding chin) and gives the effect of the patient having a concave face.[3]

Most symptoms are secondary to the abnormal skull structure. Approximately 30% of people with Crouzon syndrome develop hydrocephalus. Sensorineural hearing loss is present in some cases. The abnormalities in the manner in which the eyes fit in the eye sockets can cause vision problems. Some people with the condition have a restricted airway and can experience severe problems breathing.[4]

Crouzon syndrome is also associated with patent ductus arteriosus (PDA) and aortic coarctation.[citation needed]

Common features are a narrow/high-arched palate, posterior bilateral crossbite, hypodontia (missing some teeth), and crowding of teeth. Due to maxillary hypoplasia, people with Crouzon syndrome generally have a considerable permanent underbite and subsequently cannot chew using their incisors.[citation needed]

For reasons that are not entirely clear, most Crouzon patients also have noticeably shorter humerus and femur bones relative to the rest of their bodies than members of the general population. A small percentage of Crouzon patients also have what is called "Type II" Crouzon syndrome, distinguished by partial syndactyly.[citation needed]

Causes[edit]

The current research indicates fibroblast growth factor receptors (FGFR) FGFR2 and FGFR3 as the leading factors in causing the autosomal dominant Crouzon syndrome.[5][6] These two transmembrane proteins are two of four fibroblast growth factor receptors involved in osteoblast differentiation during embryonic development; mutations amongst these receptors are involved in several genetic disorders.[5] There are 40 known mutations, most of which are caused by a missense mutation.[7] FGFR2 is the most commonly mutated gene, a missense at cysteine 342 in exon 9, which creates a gain-of-function.[7] The FGFR2lllc isoform, created via alternative splicing of exon 3 of the FGFR2 gene, uses exon 9 and is used in mesenchymal stem cells to control ossification. However, the mutation constitutively activates the transmembrane protein via a disulfide bond formed incorrectly due to the loss of cysteine 342.[7] FGFR3 is expressed more in the frontal bones during embryonic development, guiding cranial bone development. A point mutation causes constitutive activation of tyrosine in the activation loop, located in the cytosolic region of the protein, leading to accelerated differentiation of frontal osteoblasts,[8] resulting in premature fusion of frontal cranial bones.[8]

Diagnosis[edit]

Diagnosis of Crouzon syndrome usually can occur at birth by assessing the physical appearance of the infant. Further analysis, including radiographs, magnetic resonance imaging (MRI) scans, genetic testing, X-rays and CT scans can be used to confirm the diagnosis of Crouzon syndrome.[citation needed]

Treatment[edit]

Abnormal fusion of the skull bones is characteristic of Cruzon syndrome.

Each child is different and it entirely depends on which sutures are fused and how it is affecting the child as to how it is treated. Some children have severe breathing issues due to shallow mid face and may require a tracheostomy.[citation needed]

Surgery is typically used to prevent the closure of sutures of the skull from damaging the brain's development. Without surgery, blindness and intellectual disability are typical outcomes. Craniofacial surgery is a discipline of both plastic surgery and oral and maxillofacial surgery (OMFS). To move the orbits forward, craniofacial surgeons expose the skull and orbits and reshape the bone. To treat the midface deficiency, surgeons can move the lower orbit and midface bones forward..[citation needed]

Crouzon patients tend to have multiple sutures involved, most specifically bilateral coronal craniosynostoses, and either open vault surgery or strip craniectomy (if child is under 6 months) can be performed. In the later scenario, a helmet is worn for several months following surgery.[citation needed]

Once treated for the cranial vault abnormalities, Crouzon patients generally go on to live a normal lifespan.[citation needed]

Epidemiology[edit]

Incidence of Crouzon syndrome is currently estimated to occur in 1.6 out of every 100,000 people[9] and is the most common craniostenosis syndrome.[6]

See also[edit]

References[edit]

  1. ^ synd/1383 at Who Named It?
  2. ^ L. E. O. Crouzon. Dysostose cranio-faciale héréditaire. Bulletin de la Société des Médecins des Hôpitaux de Paris, 1912, 33: 545-555.
  3. ^ "Crouzon syndrome | Genetic and Rare Diseases Information Center (GARD) – an NCATS Program". rarediseases.info.nih.gov. Retrieved 21 November 2018.
  4. ^ "Crouzon Syndrome - NORD (National Organization for Rare Disorders)". NORD (National Organization for Rare Disorders). Retrieved 21 November 2018.
  5. ^ a b Snyder-Warwick AK, Perlyn CA, Pan J, Yu K, Zhang L, Ornitz DM (February 2010). "Analysis of a gain-of-function FGFR2 Crouzon mutation provides evidence of loss of function activity in the etiology of cleft palate". Proc. Natl. Acad. Sci. U.S.A. 107 (6): 2515–20. doi:10.1073/pnas.0913985107. PMC 2823872. PMID 20133659.
  6. ^ a b Reference, Genetics Home. "Crouzon syndrome". Genetics Home Reference. Retrieved 21 November 2018.
  7. ^ a b c Fenwick AL, Goos JA, Rankin J, Lord H, Lester T, Hoogeboom AJ, van den Ouweland AM, Wall SA, Mathijssen IM, Wilkie AO (August 2014). "Apparently synonymous substitutions in FGFR2 affect splicing and result in mild Crouzon syndrome". BMC Med. Genet. 15: 95. doi:10.1186/s12881-014-0095-4. PMC 4236556. PMID 25174698.
  8. ^ a b Di Rocco F, Biosse Duplan M, Heuzé Y, Kaci N, Komla-Ebri D, Munnich A, Mugniery E, Benoist-Lasselin C, Legeai-Mallet L (June 2014). "FGFR3 mutation causes abnormal membranous ossification in achondroplasia". Hum. Mol. Genet. 23 (11): 2914–25. doi:10.1093/hmg/ddu004. PMID 24419316.
  9. ^ Adam MP, Ardinger HH, Pagon RA, Wallace SE, Bean LH, Stephens K, Amemiya A, Robin NH, Falk MJ, Haldeman-Englert CR (October 20, 1998). "FGFR-Related Craniosynostosis Syndromes". GeneReviews. PMID 20301628.

External links[edit]

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