Gerodermia osteodysplastica

Gerodermia osteodysplastica (GO), is a rare autosomal recessive[2] connective tissue disorder included in the spectrum of cutis laxa syndromes.[2][3]

Gerodermia osteodysplastica
Other namesGeroderma osteodysplasticum and Walt Disney dwarfism[1]
Gerodermia osteodysplastica has an autosomal recessive pattern of inheritance.
SpecialtyMedical genetics 

Usage of the name "Walt Disney dwarfism" is attributed to the first known case of the disorder, documented in a 1950 journal report, in which the authors described five affected members from a Swiss family as having the physical appearance of dwarves from a Walt Disney film.[4][5]

The terms "geroderma" or "gerodermia" can be used interchangeably with "osteodysplastica" or "osteodysplasticum", with the term "hereditaria" sometimes appearing at the end.[1][6]

Presentation

Gerodermia osteodysplastica is characterized by symptoms and features which affect the connective tissues, skin and skeletal system.

These are: wrinkly, loose skin over the face, abdomen, and extremities (hands, feet) on the dorsal sides usually worsened by chronic joint laxity and hyperextensibility;[7][8] fragmented elastic fibers of the skin that are reduced in number, with disorientation of collagen fibers;[9] osteopenia and osteoporosis, with associated fractures;[6][7] malar hypoplasia (underdeveloped cheek bone),[10] maxillary hypoplasia (underdeveloped upper jaw),[6] mandibular prognathism (protrusion of the lower jaw and chin),[10][11] bowed long bones,[6] platyspondyly (flattened spine) related to vertebral collapse;[6][12] kyphoscoliosis (scoliosis with kyphosis, or "hunch back"),[12] metaphyseal peg (an unusual outgrowth of metaphyseal tissue which protrudes into the epiphyseal region of the bone, near the knee);[13] and the overall physical effects and facial appearance of dwarfism with premature aging.[5][14]

Other features and findings include: intrauterine growth retardation,[8] congenital hip dislocations,[8] winged scapulae (shoulder blades),[12] pes planus (fallen arches),[12] pseudoepiphyses of the second metacarpals (upper bone of the fingers),[12] hypotelorism (close-set eyes),[7] malformed ears,[14] developmental delay,[8] failure to thrive[7] and abnormal electroencephalograph (EEG) readings.[14]

Dental and orthodontal abnormalities in addition to maxillary hypoplasia and mandibular prognathism have also been observed in gerodermia osteodysplastica. Including malocclusion of the dental arches (the maxilla and mandible),[12] radiological findings in some cases have indicated significant overgrowth of the mandibular premolar and molar roots;[11] hypercementosis (overproduction of cementum) of the molars and maxillary incisors;[11] enlarged, funnel-shaped mandibular lingula (spiny structures on the ramus of the mandible);[11] and a radiolucent effect on portions of many teeth, increasing their transparency to x-rays.[11]

Genetics

Originally believed to be inherited in an X-linked recessive fashion,[15] gerodermia osteodysplastica is now known to display strictly autosomal recessive inheritance.[3] This means the defective gene responsible for the disorder is located on an autosome, and two copies of the defective gene (one inherited from each parent) are required in order to be born with the disorder. The parents of an individual with an autosomal recessive disorder both carry one copy of the defective gene, but usually do not experience any signs or symptoms of the disorder.

It has been associated with SCYL1BP1.[16]

Diagnosis

Differential diagnosis

Many features of gerodermia osteodysplastica (GO) and another autosomal recessive form of cutis laxa, wrinkly skin syndrome (WSS, Online Mendelian Inheritance in Man (OMIM): 278250), are similar to such an extent that both disorders were believed to be variable phenotypes of a single disorder.[7][8]

Several delineating factors, however, suggest that gerodermia osteodysplastica and wrinkly skin syndrome are distinct entities, but share the same clinic spectrum.[6][8]

While the prevailing feature of wrinkly, loose skin is more localized with GO, it is usually systemic, yet eases in severity with age during the course of WSS.[6] Also, as the fontanelles ("soft spots") are usually normal on the heads of infants with GO, they are often enlarged in WSS infants.[6]

While WSS is associated with mutations of genes on chromosomes 2, 5, 7, 11 and 14; GO has been linked to mutations in the protein GORAB.[17] A serum sialotransferrin type 2 pattern, also observed with WSS, is not present in GO patients.[6]

But perhaps the most notable feature, differentiating GO from WSS and similar cutis laxa disorders, is the age-specific metaphyseal peg sometimes found in GO-affected long bone, near the knee.[13] Not appearing until around age 4–5, then disappearing by physeal closure, this oddity of bone is thought to represent a specific genetic marker unique to GO and its effects on bone development.[13]

Treatment
gollark: I wrote lyricly's and 7.
gollark: Yes. Factorials can be extended to real numbers in many ways.
gollark: Don't worry, I rebound π as that gamma constant.
gollark: Lyricly doesn't know that I really made #π.
gollark: Those do nothing, you realise.

See also
  • Ehlers-Danlos syndrome
  • Progeria
  • Skeletal dysplasia

References
  1. Online Mendelian Inheritance in Man (OMIM): 231070
  2. Paul R, Kapoor S, Puri R, Bijarnia S (Dec 2004). "Gerodermia Osteodysplastica". Indian J. Pediatr. 71 (12): e77–79. PMID 15630332.
  3. Nappi C, Greco E, Anichini C, Guerra G, Di Spiezio Sardo A (Jan 2008). "Pregnancy in a gerodermia ostedysplastica patient: a case report". Am. J. Obstet. Gynecol. 198 (1): e17–19. doi:10.1016/j.ajog.2007.09.037. PMID 18166294.
  4. Bamatter F, Franceschetti A, Klein D, Sierro A (1950). "Gerodermie osteodysplastique hereditaire". Annales Paediatrici. 174 (4): 126–127. doi:10.1177/0011128707308160.
  5. Hunter AG, Martsolf JT, Baker CG, Reed MH (Feb 1978). "Geroderma osteodysplastica. A report on two affected families". Hum. Genet. 40 (3): 311–324. doi:10.1007/BF00272192. PMID 631850.
  6. Rajab A, Kornak U, Budde BS, Hoffmann K, Jaeken J, Nürnberg P, Mundlos S (Apr 2008). "Geroderma osteodysplasticum hereditaria and wrinkly skin syndrome in 22 patients from Oman". Am. J. Med. Genet. A. 146A (8): 965–976. doi:10.1002/ajmg.a.32143. PMID 18348262.
  7. Al-Gazali LI, Sztriha L, Skaff F, Haas D (Jul 2001). "Gerodermia osteodysplastica and wrinkly skin syndrome: are they the same?". Am. J. Med. Genet. 101 (3): 213–220. doi:10.1002/ajmg.1352. ISSN 0148-7299. PMID 11424136.
  8. Nanda A, Alsaleh QA, Al-Sabah H, Marzouk EE, Salam AM, Nanda M, Anim JT (Jan 2008). "Gerodermia osteodysplastica/wrinkly skin syndrome: report of three patients and brief review of the literature". Pediatr. Dermatol. 25 (1): 66–71. doi:10.1111/j.1525-1470.2007.00586.x. PMID 18304158.
  9. Boente Mdel C, Asial RA, Winik BC (Sep–Oct 2006). "Geroderma osteodysplastica. Report of a new family". Pediatr. Dermatol. 23 (5): 467–472. doi:10.1111/j.1525-1470.2006.00285.x. PMID 17014644.
  10. Hunter AG (Dec 1988). "Is geroderma osteodysplastica underdiagnosed?". J. Med. Genet. 25 (12): 854–857. doi:10.1136/jmg.25.12.854. PMC 1051618. PMID 3236370.
  11. Lustmann J, Nahlielio O, Harary D, Casap N, Neder A, Zlotogora J (Aug 1993). "Gerodermia osteodysplastica: report on two patients and surgical correction of facial deformity". Am. J. Med. Genet. 47 (2): 261–267. doi:10.1002/ajmg.1320470224. PMID 8213917.
  12. Lisker R, Hernández A, Martínez-Lavin M, Mutchinick O, Armas C, Reyes P, Robles-Gil J (1979). "Gerodermia osteodysplastica hereditaria: report of three affected brothers and literature review". Am. J. Med. Genet. 3 (4): 389–395. doi:10.1002/ajmg.1320030410. PMID 474638.
  13. Eich GF, Steinmann B, Hodler J, Exner GU, Giedion A (May 1996). "Metaphyseal peg in geroderma osteodysplasticum: a new genetic bone marker and a specific finding?". Am. J. Med. Genet. 63 (1): 62–67. doi:10.1002/(SICI)1096-8628(19960503)63:1<62::AID-AJMG13>3.0.CO;2-S. PMID 8723088.
  14. al-Torki NA, al-Awadi SA, Chindro-Heberie L, Sabry MA (Jan 1997). "Gerodermia osteodysplastica in a Bedouin sibship: further delineation of the syndrome". Clin. Dysmorphol. 6 (1): 51–55. doi:10.1097/00019605-199701000-00009. PMID 9018419.
  15. Boreux, G (May 1969). "Osteodysplasic geroderma of sex-linked heredity, a new clinical and genetic entity" [Osteodysplasic geroderma of sex-linked heredity, a new clinical and genetic entity]. Journal de génétique humaine (in French). 17 (1): 137–78. ISSN 0021-7743. PMID 4980119.
  16. Hennies HC, Kornak U, Zhang H, et al. (December 2008). "Gerodermia osteodysplastica is caused by mutations in SCL1BP1, a Rab-6 interacting golgin". Nat. Genet. 40 (12): 1410–2. doi:10.1038/ng.252. PMC 3122266. PMID 18997784.
  17. Hennies, Hans Christian; Kornak, Uwe; Zhang, Haikuo; Egerer, Johannes; Zhang, Xin; Seifert, Wenke; Kühnisch, Jirko; Budde, Birgit; Nätebus, Marc (December 2008). "Gerodermia osteodysplastica is caused by mutations in SCYL1BP1, a Rab-6 interacting golgin". Nature Genetics. 40 (12): 1410–1412. doi:10.1038/ng.252. ISSN 1546-1718. PMC 3122266. PMID 18997784.
Classification
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