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Development of a low cost semiquantitative polymerase chain reaction assay for molecular diagnosis of williams syndrome

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dc.contributor.author Ranaweera, D.M.
dc.contributor.author de Silva, D.C.
dc.contributor.author Samarasinghe, D.
dc.contributor.author Perera, S.
dc.contributor.author Kugalingam, N.
dc.contributor.author Samarasinghe, S.R.
dc.contributor.author Madushani, W.Y.
dc.contributor.author Jayaweera, H.H.E.
dc.contributor.author Gunewardene, S.
dc.contributor.author Muneeswaran, K.
dc.contributor.author Gnanam, V.S.
dc.contributor.author Chandrasekharan, N.V.
dc.date.accessioned 2024-04-04T07:32:01Z
dc.date.available 2024-04-04T07:32:01Z
dc.date.issued 2024
dc.identifier.citation Clinical Laboratory.2024;70(3):10.7754/Clin.Lab.2023.230710 en_US
dc.identifier.issn 1433-6510
dc.identifier.uri http://repository.kln.ac.lk/handle/123456789/27865
dc.description Indexed in MEDLINE en_US
dc.description.abstract BACKGROUND: Williams Beuren Syndrome (WBS) is a well-recognized and common genetic cause of congenital heart defects, developmental delay, hypercalcemia, and characteristic facial features. It is caused by a 1.5 - 1.8 Mb heterozygous deletion of chromosome 7q11.23 with loss of around 28 coding genes. The aim of this study was to develop a low-cost, semi-quantitative PCR (sqPCR) method to detect the chromosome 7q11.23 deletion. METHODS: Twenty-four suspected WBS cases were recruited following ethical clearance and informed consent. Blood was obtained, DNA extracted and spectrophotometrically quantified using standard methods. To detect the deletion by dosage analysis, a target region within a gene located in the WBS commonly deleted region of 7q11.23 was amplified together with a control region in a duplex sqPCR assay. The control region was telomeric to the WBS commonly deleted region and was located in chromosome 7q31.2. The two target regions within the deleted region namely a locus within ELN and a marker in the intergenic region between FZD9 and FKBP6 and designated IFF, were amplified in separate duplex sqPCR assays. The Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) gene was used as the control for normalization. Included in the assay were a non-deleted and deleted individuals' samples. RESULTS: Nineteen patients were identified to have the deletion while five did not. All 24 patients' results were confirmed by whole exome sequencing and 11 also by fluorescence in-situ hybridization (FISH). CONCLUSIONS: The data obtained indicates the sqPCR assay developed in this study to be an accurate and reliable diagnostic test for WBS. Most Sri Lankan patients with WBS are diagnosed clinically, as many parents of affected WBS children are unable to afford currently available molecular diagnostic testing. This low cost sqPCR test is therefore likely to benefit Sri Lankan WBS patients, by enabling genetic testing for confirming or refuting a clinical diagnosis of WBS and may be of use in other low and middle income countries. en_US
dc.language.iso en en_US
dc.publisher Clinical Laboratory Publications en_US
dc.subject Development en_US
dc.title Development of a low cost semiquantitative polymerase chain reaction assay for molecular diagnosis of williams syndrome en_US
dc.type Article en_US


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