Weissenbacher–Zweymüller syndrome

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Weissenbacher–Zweymüller syndrome
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Weissenbacher–Zweymuller syndrome (WZS), also called Pierre-Robin syndrome with fetal chondrodysplasia,[1] is an autosomal recessive[2] congenital disorder, linked to mutations (955 gly -> glu) in the COL11A2 gene (located on chromosomal position 6p21.3), which codes for the α2 strand of collagen type XI.[1][2] It is a collagenopathy, types II and XI disorder.

Presentation[edit | edit source]

It causes facial abnormalities, skeletal malformation and occasionally neural tube defects; the skeletal disfigurements resolve to a degree in the course of development.

Mutations in different parts of the gene may lead to deafness or Stickler syndrome type III (eye problems: myopia, retinal detachment and skeletal abnormalities).

Infants and children: Infants that are born with Weissenbacher-Zweymüller syndrome usually have short bones in their arms and legs. [3] The thigh and upper arm bones are wider than usual resulting in a dumbbell-shape while the bones of the vertebrae may be abnormal.[4] Typical abnormal facial features can be wide-set protruding eyes (hypertelorism), a small and upturned nose with a flat bridge, small jaw (micrognathia) and a cleft palate. Some infants have high-frequency hearing loss.[5] Infants may also exhibit a psychomotor delay.[6] After the period of growth deficiency the individual makes improvements in bone growth leading to a normal physical development around age 5 or 6.[7]

Adults: Many with Weissenbacher-Zweymüller syndrome have a catch-up growth phase causing the adults to not be unusually short. Many adults still will have hearing loss and typical abnormal facial features of Weissenbacher-Zweymüller syndrome. [8]

Causes[edit | edit source]

Dominant genetic disorders can be caused by just a single copy of an abnormal gene. This abnormal gene can be the result of being inherited from either parent or be a new mutation.[9] Most cases are caused by a de novo (new) mutation in the gene that occurs during the formation of the egg or sperm. These cases occur when there is no history of the disorder in the family. The COL11A2 gene is responsible for providing instructions on making one component of the type XI collagen. [10] Type XI collagen is a complex molecule that helps give structure and strength to the connective tissues.[11] Collagen is found in bone. It is also found in cartilage that makes up most of the skeleton during early development. The mutation of COL11A2 in Weissenbacher-Zweymüller syndrome disrupts the assembly of the type XI collagen molecules.[12] The malfunctioning collagen weakens the connective tissue causing impaired bone development. [13] COL11A2 is also associated with autosomal dominant non-syndromic hearing loss (ADNSHL).[14] All mutations of COL11A2 in ADNSHL are missense mutations.[15]

Diagnosis[edit | edit source]

Weissenbacher-Zweymüller syndrome is diagnosed upon a thorough clinical evaluation, detailed patient history, identification of characteristic symptom and a variety of specialized tests which includes x-rays. [16]

Treatment[edit | edit source]

There is no cure as of now. Treatment is directed towards the specific symptoms that are present in each individual. [17] Individuals with hearing loss are able to get treated with hearing aids.

Epidemiology[edit | edit source]

Weissenbacher-Zweymüller syndrome affects males and females in the same numbers. About 30 cases have been reported in medical literature. [18]This disorder can be underdiagnosed causing no true frequency in the population.[19] Only 30 cases have been reported in medical literature. [20]

Eponym[edit | edit source]

It was first characterized in 1964 by G. Weissenbacher and Ernst Zweymüller.[21][22]

References[edit | edit source]

  1. ↑ 1.0 1.1 Online Mendelian Inheritance in Man (OMIM) 120290
  2. ↑ 2.0 2.1
  3. ↑ Genetics Home Reference. (2016). Retrieved from U.S. National Library of Medicine : https://ghr.nlm.nih.gov/condition/weissenbacher-zweymuller-syndrome
  4. ↑ Genetics Home Reference. (2016). Retrieved from U.S. National Library of Medicine : https://ghr.nlm.nih.gov/condition/weissenbacher-zweymuller-syndrome
  5. ↑ Genetics Home Reference. (2016). Retrieved from U.S. National Library of Medicine : https://ghr.nlm.nih.gov/condition/weissenbacher-zweymuller-syndrome
  6. ↑ OSMED, Heterozygous. (2006). Retrieved from National Organization for Rare Disorders: http://rarediseases.org/rare-diseases/osmed-heterozygous
  7. ↑ OSMED, Heterozygous. (2006). Retrieved from National Organization for Rare Disorders: http://rarediseases.org/rare-diseases/osmed-heterozygous
  8. ↑ Genetics Home Reference. (2016). Retrieved from U.S. National Library of Medicine : https://ghr.nlm.nih.gov/condition/weissenbacher-zweymuller-syndrome
  9. ↑ OSMED, Heterozygous. (2006). Retrieved from National Organization for Rare Disorders: http://rarediseases.org/rare-diseases/osmed-heterozygous
  10. ↑ Genetics Home Reference. (2016). Retrieved from U.S. National Library of Medicine : https://ghr.nlm.nih.gov/condition/weissenbacher-zweymuller-syndrome
  11. ↑ Genetics Home Reference. (2016). Retrieved from U.S. National Library of Medicine : https://ghr.nlm.nih.gov/condition/weissenbacher-zweymuller-syndrome
  12. ↑ Genetics Home Reference. (2016). Retrieved from U.S. National Library of Medicine : https://ghr.nlm.nih.gov/condition/weissenbacher-zweymuller-syndrome
  13. ↑ Genetics Home Reference. (2016). Retrieved from U.S. National Library of Medicine : https://ghr.nlm.nih.gov/condition/weissenbacher-zweymuller-syndrome
  14. ↑ Kim, S., Park, H., Sagong, B. et al. Genes Genom (2016). doi:10.1007/s13258-016-0440-4
  15. ↑ Kim, S., Park, H., Sagong, B. et al. Genes Genom (2016). doi:10.1007/s13258-016-0440-4
  16. ↑ OSMED, Heterozygous. (2006). Retrieved from National Organization for Rare Disorders: http://rarediseases.org/rare-diseases/osmed-heterozygous
  17. ↑ OSMED, Heterozygous. (2006). Retrieved from National Organization for Rare Disorders: http://rarediseases.org/rare-diseases/osmed-heterozygous
  18. ↑ OSMED, Heterozygous. (2006). Retrieved from National Organization for Rare Disorders: http://rarediseases.org/rare-diseases/osmed-heterozygous
  19. ↑ OSMED, Heterozygous. (2006). Retrieved from National Organization for Rare Disorders: http://rarediseases.org/rare-diseases/osmed-heterozygous
  20. ↑ OSMED, Heterozygous. (2006). Retrieved from National Organization for Rare Disorders: http://rarediseases.org/rare-diseases/osmed-heterozygous
  21. ↑ synd/1776 at Who Named It?
  22. ↑

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Contributors: Prab R. Tumpati, MD