Cited by 72Williams Syndrome ResearchGenomic variations and chromosomal abnormalitiesGenomics and Rare Diseases

Two high throughput technologies to detect segmental aneuploidies identify new Williams-Beuren syndrome patients with atypical deletions

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Howald, C, Merla, G, Digilio, M C, Amenta, S, Lyle, R, Deutsch, S, Choudhury, U, Bottani, A +4 more·2006·Journal of Medical Genetics

Abstract

Objective: To develop and compare two new technologies for diagnosing a contiguous gene syndrome, the Williams-Beuren syndrome (WBS). Methods: The first proposed method, named paralogous sequence quantification (PSQ), is based on the use of paralogous sequences located on different chromosomes and quantification of specific mismatches present at these loci using pyrosequencing technology. The second exploits quantitative real time polymerase chain reaction (QPCR) to assess the relative quantity of an analysed locus. Results: A correct and unambiguous diagnosis was obtained for 100% of the analysed samples with either technique (n = 165 and n = 155, respectively). These methods allowed the identification of two patients with atypical deletions in a cohort of 182 WBS patients. Both patients presented with mild facial anomalies, mild mental retardation with impaired visuospatial cognition, supravalvar aortic stenosis, and normal growth indices. These observations are consistent with the involvement of GTF2IRD1 or GTF2I in some of the WBS facial features. Conclusions: Both PSQ and QPCR are robust, easy to interpret, and simple to set up. They represent a competitive alternative for the diagnosis of segmental aneuploidies in clinical laboratories. They have advantages over fluorescence in situ hybridisation or microsatellites/SNP genotyping for detecting short segmental aneuploidies as the former is costly and labour intensive while the latter depends on the informativeness of the polymorphisms.

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Authors
Howald, C., Merla, G., Digilio, M. C., Amenta, S., Lyle, R., Deutsch, S., Choudhury, U., Bottani, A., Antonarakis, S. E., Fryssira, H., Dallapiccola, B., & Reymond, A.
Affiliations
  • University of Geneva (CH)
  • Bambino Gesù Children's Hospital (IT)
  • National and Kapodistrian University of Athens (GR)
  • University of Lausanne (CH)
Corresponding author
Reymond, A
Venue
Journal of Medical Genetics
Publisher
BMJ
Published
2005-07-01
Volume
43
Issue
3
Pages
266-273
ISSN
  • 0022-2593 (ISSN-L)
  • 1468-6244
OpenAlex
W2110815266
Cited by
72
References
31
Citations by year
2023: 1 · 2022: 1 · 2021: 1 · 2019: 5 · 2018: 2 · 2017: 1 · 2016: 5 · 2015: 6 · 2014: 5 · 2013: 3 · 2012: 6
FWCI
1.58
Type
journal article
Language
en
Open access
Locations
  • Journal of Medical Genetics (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • IRIS (submittedVersion)
  • SERVAL (Université de Lausanne) (submittedVersion)
  • Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by)
  • Archive ouverte UNIGE (University of Geneva) (submittedVersion)
Funders
  • Fondation Jérôme Lejeune
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Topics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Williams Syndrome Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomic variations and chromosomal abnormalities
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
Keywords
Williams syndrome, segmental aneuploidy, pyrosequencing, quantitative real-time PCR, atypical deletion, GTF2IRD1, GTF2I, contiguous gene syndrome, facial anomalies, intellectual disability, supravalvular aortic stenosis
MeSH terms
Aneuploidy, Diagnosis, Differential, Humans, Polymorphism, Genetic, Polymerase Chain Reaction, Sequence Deletion, In Situ Hybridization, Fluorescence, Williams Syndrome

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