Detection of exon deletions within an entire gene (CFTR) by relative quantification on the LightCycler

Schneider, Mircea; Joncourt, Franziska; Sanz, Javier; von Känel, Thomas; Gallati, Sabina (2006). Detection of exon deletions within an entire gene (CFTR) by relative quantification on the LightCycler. Clinical chemistry, 52(11), pp. 2005-12. Washington, D.C.: American Association for Clinical Chemistry 10.1373/clinchem.2005.065136

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BACKGROUND: Cystic fibrosis (CF) is associated with at least 1 pathogen point sequence variant on each CFTR allele. Some symptomatic patients, however, have only 1 detectable pathogen sequence variant and carry, on the other allele, a large deletion that is not detected by conventional screening methods. METHODS: For relative quantitative real-time PCR detection of large deletions in the CFTR gene, we designed DNA-specific primers for each exon of the gene and primers for a reference gene (beta2-microglobulin). For PCR we used a LightCycler system (Roche) and calculated the gene-dosage ratio of CFTR to beta2-microglobulin. We tested the method by screening all 27 exons in 3 healthy individuals and 2 patients with only 1 pathogen sequence variant. We then performed specific deletion screenings in 10 CF patients with known large deletions and a blinded analysis in which we screened 24 individuals for large deletions by testing 8 of 27 exons. RESULTS: None of the ratios for control samples were false positive (for deletions or duplications); moreover, for all samples from patients with known large deletions, the calculated ratios for deleted exons were close to 0.5. In addition, the results from the blinded analysis demonstrated that our method can also be used for the screening of single individuals. CONCLUSIONS: The LightCycler assay allows reliable and rapid screening for large deletions in the CFTR gene and detects the copy number of all 27 exons.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine

UniBE Contributor:

Schneider, Mircea; Joncourt, Franziska; Sanz, Javier and Gallati, Sabina

ISSN:

0009-9147

ISBN:

16990428

Publisher:

American Association for Clinical Chemistry

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:48

Last Modified:

06 Dec 2013 13:42

Publisher DOI:

10.1373/clinchem.2005.065136

PubMed ID:

16990428

Web of Science ID:

000241652400004

URI:

https://boris.unibe.ch/id/eprint/19987 (FactScience: 3066)

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