7q11.23 duplication syndrome
Other namesdup7, 7dup

7q11.23 duplication syndrome (also called dup7 or 7dup or Duplication of the Williams-Beuren Syndrome Critical Region) is a rare genetic syndrome caused by micro-duplication of 1.5-1.8 mega base in section q11.23 of chromosome 7.

This syndrome is characterized by a wide spectrum of neurological, behavior and other medical problems which may appear in different levels of severity. Common characteristics are speech and sound disorder (CAS - childhood apraxia of speech, dysarthria), delayed development, delayed motor development and clumsiness, anxiety (especially on social conditions), selective mutism (in 20% of the subjects), ADHD, oppositional disorder, ASD (in 20%), intellectual disability in 18%, cardio-vascular disease (dilation of the ascending aorta in 46%), seizures in 19%, neurological abnormalities (hypotonia, adventitious movements).[1] hydrocephalus in 5.6%,[2] chronic constipation. The syndrome was first reported in 2005 [3]

Symptoms and signs

  1. Eyes issues - high strength glasses, strabismus
  2. Hypospadias
  3. Hypermobility
  4. Hypertonia
  5. Hearing loss

Diagnosis

A medical examination is recommended for newly diagnosed including echocardiogram for detection of heart defects (mainly aorta dilation), kidneys ultrasound, consider brain MRI.[1][4]

Treatment

Intensive speech/language therapy was found to be important for maximizing long-term outcomes.[5]

Society and culture

Simon Searchlight is an international patient registry for dup7 patients to help speed up research into neurodevelopmental disorders. By collecting detailed participant information and blood samples, Simons Searchlight takes a deep dive into rare genetic conditions, sharing the data and samples for free with researchers. Participation is open to individuals all over the world who speak English and Spanish (and more languages to come). In the future, it might also contain iPSC which will be generated from these blood samples. Anyone who carries a 7q11.23 duplication can join this registry.[6]

References

  1. 1 2 Mervis, Carolyn B.; Morris, Colleen A.; Klein-Tasman, Bonita P.; Velleman, Shelley L.; Osborne, Lucy R. (2015). "7q11.23 Duplication Syndrome". Genetic Conditions. University of Washington, Seattle. PMID 26610320. Retrieved 2019-05-26.
  2. ↑ Morris, Colleen A.; Mervis, Carolyn B.; Paciorkowski, Alex P.; et al. (December 2015). "7q11.23 Duplication Syndrome: Physical Characteristics and Natural History". American Journal of Medical Genetics. Part A. 167A (12): 2916–2935. doi:10.1002/ajmg.a.37340. ISSN 1552-4825. PMC 5005957. PMID 26333794.
  3. ↑ Somerville, Martin J.; Mervis, Carolyn B.; Young, Edwin J.; Seo, Eul-Ju; del Campo, Miguel; Bamforth, Stephen; Peregrine, Ella; Loo, Wayne; Lilley, Margaret (2005-10-20). "Severe Expressive-Language Delay Related to Duplication of the Williams–Beuren Locus". New England Journal of Medicine. 353 (16): 1694–1701. doi:10.1056/NEJMoa051962. ISSN 0028-4793. PMC 2893213. PMID 16236740.
  4. ↑ Parrott Ashley; et al. "Aortopathy in the 7q11. 23 microduplication syndrome" (PDF). American Journal of Medical Genetics Part A. 167 (2).
  5. ↑ Velleman, Shelley L.; Mervis, Carolyn B. (2011-10-01). "Children with 7q11.23 Duplication Syndrome: Speech, Language, Cognitive, and Behavioral Characteristics and their Implications for Intervention". Perspectives on Language Learning and Education. 18 (3): 108–116. doi:10.1044/lle18.3.108. ISSN 1940-7742. PMC 3383616. PMID 22754604.
  6. ↑ "Simons Searchlight". Simons Searchlight. n.d. Retrieved 2023-12-27.
  • The first conference on dup7 was held in Washington DC in Jun 2018. Link to the lectures videos
  • Simons searchlight page on 7q11.23 Duplication Syndrome includes a guide and their annual registry report on the syndrome
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