Apert syndrome

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Apert syndrome
Classification and external resources
Patient with Apert syndrome.jpg
A child with Apert syndrome
ICD-10Q87.0
ICD-9755.55
OMIM101200
DiseasesDB33968
MedlinePlus001581
eMedicineped/122
MeSHD000168
 
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Apert syndrome
Classification and external resources
Patient with Apert syndrome.jpg
A child with Apert syndrome
ICD-10Q87.0
ICD-9755.55
OMIM101200
DiseasesDB33968
MedlinePlus001581
eMedicineped/122
MeSHD000168

Apert syndrome is a form of acrocephalosyndactyly, a congenital disorder characterized by malformations of the skull, face, hands and feet. It is classified as a branchial arch syndrome, affecting the first branchial (or pharyngeal) arch, the precursor of the maxilla and mandible. Disturbances in the development of the branchial arches in fetal development create lasting and widespread effects.

In 1906, Eugène Apert, a French physician, described nine people sharing similar attributes and characteristics.[1] Linguistically, "acro" is Greek for "peak", referring to the "peaked" head that is common in the syndrome. "Cephalo", also from Greek, is a combining form meaning "head". "Syndactyly" refers to webbing of fingers and toes.

In embryology, the hands and feet have selective cells that die, called selective cell death or apoptosis, causing separation of the digits. In the case of acrocephalosyndactyly, selective cell death does not occur and skin, and rarely bone, between the fingers and toes fuses.

The cranial bones are affected as well, similar to Crouzon syndrome and Pfeiffer syndrome. Craniosynostosis occurs when the fetal skull and facial bones fuse too soon in utero, disrupting normal bone growth. Fusion of different sutures leads to different patterns of growth on the skull. Examples include: trigonocephaly (fusion of the metopic suture), brachycephaly (fusion of the coronal suture and lambdoid suture bilaterally), dolichocephaly (fusion of the sagittal suture), plagiocephaly (fusion of coronal and lambdoidal sutures unilaterally), and oxycephaly or turricephaly (fusion of coronal and lambdoid sutures).

Findings for the incidence of the syndrome in the population have varied,[2] with estimates as low as 1 birth in 200,000 provided[3] and 160,000 given as an average by older studies.[4][5] A study conducted in 1997, however, by the California Birth Defects Monitoring Program, found an incidence rate of 1 in 80,645 out of almost 2.5 million live births.[6] Another study conducted in 2002 by the Craniofacial Center, North Texas Hospital For Children, found a higher incidence of about 1 in 65,000 live births.[2]

Signs and symptoms[edit]

Craniosynostosis[edit]

The cranial malformations are the most apparent effects of acrocephalosyndactyly. Craniosynostosis occurs, with brachiocephaly being the common pattern of growth. Another common characteristic is a high, prominent forehead with a flat posterior skull. Due to the premature closing of the coronal sutures, increased cranial pressure can develop, leading to mental deficiency. A flat or concave face may develop as a result of deficient growth in the mid-facial bones, leading to a conditir prognathism. Other features of acrocephalosyndactyly may include shallow bony orbits and broadly spaced eyes. Low-set ears are also a typical characteristic of branchial arch syndromes.

Syndactyly[edit]

All acrocephalosyndactyly syndromes show some level of limb anomalies, so it can be hard to tell them apart. However, the typical hand deformities in patients with Apert Syndrome distinguish it from the other syndromes.[7] The hands in patients with Apert syndrome always show four common features:[8]

  1. a short thumb with radial deviation
  2. complex syndactyly of the index, long and ring finger
  3. symbrachyphalangism
  4. simple syndactyly of the fourth webspace

The deformity of the space between the index finger and the thumb may be variable. Based on this first webspace, we can differentiate three different types of handdeformation:

Type I ("spade")Type II ("mitten")Type III ("rosebud")
First webspaceSimple SyndactylySimple SyndactylyComplex Syndactyly
Middle three fingersSide-to-side fusion with flat palmFusion of fingertops forming a concave palmTight fusion of all digits with one conjoined nail
Fourth webspaceSimple and incomplete syndactylySimple and complete syndactylySimple and complete syndactyly

Causes[edit]

Acrocephalosyndactyly may be an autosomal dominant disorder. Males and females are affected equally; however research is yet to determine an exact cause. Nonetheless, almost all cases are sporadic, signifying fresh mutations or environmental insult to the genome. The offspring of a parent with Apert syndrome has a 50% chance of inheriting the condition. In 1995, A.O.M. Wilkie published a paper showing evidence that acrocephalosyndactyly is caused by a defect on the fibroblast growth factor receptor 2 gene, on chromosome 10.[9]

Apert syndrome is an autosomal dominant disorder; approximately two-thirds of the cases are due to a C to G mutation at the position 755 in the FGFR2 gene, which causes a Ser to Trp change in the protein.[10] This is a male-specific mutation hotspot: in a study of 57 cases, the mutation always occurred on the paternally derived allele.[11] On the basis of the observed birth prevalence of the disease (1 in 70,000), the apparent rate of C to G mutations at this site is about .00005, which is 200- to 800-fold higher than the usual rate for mutations at CG dinucleotides. Moreover, the incidence rises sharply with the age of the father. Goriely et al. (2003) analyzed the allelic distribution of mutations in sperm samples from men of different ages and concluded that the simplest explanation for the data is that the C to G mutation gives the cell an advantage in the male germline.[10]

It is still not very clear why people with Apert Syndrome have both craniosynostosis and syndactyly. There has been one study that suggests it has something to do with the expression of three isoforms of FGFR2, the gene with the point mutations that causes the syndrome in 98% of the patients.[12] KFGR, keratinocyte growth factor receptor, is an isoform active in the metaphysis and interphalangeal joints. FGFR1 is an isoform active in the diaphysis. FGFR2-Bek is active in the metaphysis, as well as the diaphysis, but also in the interdigital mesenchyme. The point mutation increases the ligand-dependent activation of FGFR2, and thus of its isoforms. This means that FGFR2 loses its specificity, causing binding of FGFs that normally do not bind to the receptor. Since FGF suppresses apoptosis, the interdigital mesenchyme is maintained. FGF also increases replication and differentiation of osteoblasts, thus early fusion of several sutures of the skull. This may explain why both symptoms are always found in Apert Syndrome.

Treatments[edit]

Craniosynostosis[edit]

Surgery is needed to prevent the closing of the coronal sutures from damaging brain development. In particular, surgeries for the LeFort III or monobloc midface distraction osteogenesis which detaches the midface or the entire upper face, respectively, from the rest of the skull, are performed in order to reposition them in the correct plane. These surgeries are performed by both plastic and oral and maxillofacial (OMS) surgeons, often in collaboration.

Syndactyly[edit]

There is no standard treatment for the hand malformations in Apert due to the differences and severity in clinical manifestations in different patients. Every patient should therefore be individually approached and treated, aiming at an adequate balance between hand functionality and aesthetics. However, some guidelines can be given depending on the severity of the deformities. In general it is initially recommended to release the first and fourth interdigital spaces, thus releasing the border rays.[13] This makes it possible for the child to grasp things with its hand, a very important function for the child's development. Later the second and third interdigital spaces have to be released. Because there are three handtypes in Apert, all with their own deformities, they all need a different approach regarding their treatment:

With growing of a child and respectively the hands, secondary revisions are needed to treat the contractures and to improve the aesthetics.

Dental significance[edit]

Common relevant features of acrocephalosyndactyly are a high-arched palate, pseudomandibular prognathism (appearing as mandibular prognathism), a narrow palate, and crowding of the teeth.

See also[edit]

References[edit]

  1. ^ synd/194 at Who Named It?
  2. ^ a b Fearon, Jeffrey A. (July 2003). "Treatment of the Hands and Feet in Apert Syndrome: An Evolution in Management". Plastic and Reconstructive surgery (Dallas, Texas) 112 (1): 1–12. doi:10.1097/01.PRS.0000065908.60382.17. ISSN 0032-1052. PMID 12832871. 
  3. ^ Foreman, Phil (2009). Education of Students with an Intellectual Disability: Research and Practice (PB). IAP. p. 30. ISBN 978-1-60752-214-0. 
  4. ^ Carter, Charles H. (1965). Medical aspects of mental retardation. Thomas. p. 358. OCLC 174056103. 
  5. ^ Abe Bert Baker; Lowell H. Baker (1979). "Apert's Syndrome". Clinical Neurology (Medical Dept., Harper & Row) 3: 47. OCLC 11620265. 
  6. ^ Aitken, J. Kenneth (2010). An A-Z of Genetic Factors in Autism: A Handbook for Professionals. Jessica Kingsley. p. 133. ISBN 978-1-84310-976-1. 
  7. ^ Kaplan, L C (April 1991). "Clinical assessment and multispecialty management of Apert syndrome". Clinics in plastic surgery 18 (2): 217–25. ISSN 0094-1298. PMID 2065483. 
  8. ^ Upton, J (April 1991). "Apert Syndrome. Classification and pathologic anatomy of limb anomalies". Clinics in plastic surgery 18 (2): 321–55. ISSN 0094-1298. PMID 2065493. 
  9. ^ Wilkie, A O; S F Slaney; M Oldridge; M D Poole; G J Ashworth; A D Hockley; R D Hayward; D J David; L J Pulleyn; P Rutland (February 1995). "Apert syndrome results from localized mutations of FGFR2 and is allelic with Crouzon syndrome". Nature Genetics 9 (2): 165–72. doi:10.1038/ng0295-165. PMID 7719344. 
  10. ^ a b Goriely, A.; McVean, GA; Röjmyr, M; Ingemarsson, B; Wilkie, AO (2003). "Evidence for Selective Advantage of Pathogenic FGFR2 Mutations in the Male Germ Line". Science 301 (5633): 643–6. doi:10.1126/science.1085710. PMID 12893942. 
  11. ^ Moloney, DM; Slaney, SF; Oldridge, M; Wall, SA; Sahlin, P; Stenman, G; Wilkie, AO (1996). "Exclusive paternal origin of new mutations in Apert syndrome". Nature Genetics 13 (1): 48–53. doi:10.1038/ng0596-48. PMID 8673103. 
  12. ^ Britto, J A; J C T Chan; R D Evans; R D Hayward; B M Jones (May 2001). "Differential expression of fibroblast growth factor receptors in human digital development suggests common pathogenesis in complex acrosyndactyly and craniosynostosis". Plastic and Reconstructive surgery 107 (6): 1331–1338. PMID 11335797. 
  13. ^ Zucker, R M (April 1991). "Syndactyly correction of the hand in Apert syndrome". Clinics in plastic surgery 18 (2): 357–64. ISSN 0094-1298. PMID 1648464. 

External links[edit]