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Multiplex pyrosequencing assay using AdvISER-MH-PYRO algorithm: a case for rapid and cost-effective genotyping analysis of prostate cancer risk-associated SNPs.

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Ambroise, Jérôme [UCL] Butoescu , Valentina Rodica [UCL] Robert , Annie [UCL] Tombal, Bertrand [UCL] Gala, Jean-Luc [UCL]

(eng) BACKGROUND: Single Nucleotide Polymorphisms (SNPs) identified in Genome Wide Association Studies (GWAS) have generally moderate association with related complex diseases. Accordingly, Multilocus Genetic Risk Scores (MGRSs) have been computed in previous studies in order to assess the cumulative association of multiple SNPs. When several SNPs have to be genotyped for each patient, using successive uniplex pyrosequencing reactions increases analytical reagent expenses and Turnaround Time (TAT). While a set of several pyrosequencing primers could theoretically be used to analyze multiplex amplicons, this would generate overlapping primer-specific pyro-signals that are visually uninterpretable. METHODS: In the current study, two multiplex assays were developed consisting of a quadruplex (n=4) and a quintuplex (n=5) polymerase chain reaction (PCR) each followed by multiplex pyrosequencing analysis. The aim was to reliably but rapidly genotype a set of prostate cancer-related SNPs (n=9). The nucleotide dispensation order was selected using SENATOR software. Multiplex pyro-signals were analyzed using the new AdvISER-MH-PYRO software based on a sparse representation of the signal. Using uniplex assays as gold standard, the concordance between multiplex and uniplex assays was assessed on DNA extracted from patient blood samples (n = 10). RESULTS: All genotypes (n=90) generated with the quadruplex and the quintuplex pyroquencing assays were perfectly (100 %) concordant with uniplex pyrosequencing. Using multiplex genotyping approach for analyzing a set of 90 patients allowed reducing TAT by approximately 75 % (i.e., from 2025 to 470 min) while reducing reagent consumption and cost by approximately 70 % (i.e., from ~229 US$ /patient to ~64 US$ /patient). CONCLUSIONS: This combination of quadruplex and quintuplex pyrosequencing and PCR assays enabled to reduce the amount of DNA required for multi-SNP analysis, and to lower the global TAT and costs of SNP genotyping while providing results as reliable as uniplex analysis. Using this combined multiplex approach also substantially reduced the production of waste material. These genotyping assays appear therefore to be biologically, economically and ecologically highly relevant, being worth to be integrated in genetic-based predictive strategies for better selecting patients at risk for prostate cancer. In addition, the same approach could now equally be transposed to other clinical/research applications relying on the computation of MGRS based on multi-SNP genotyping.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2015
Language Anglais
Journal information "BMC Medical Genetics" - Vol. 16, no. 1, p. 42-52 (2015)
Peer reviewed yes
Publisher BioMed Central Ltd. ((United Kingdom) London)
e-issn 1471-2350
Publication status Publié
Affiliations UCL - SSS/IREC/CTMA - Centre de technologies moléculaires appliquées (plate-forme technologique)
UCL - SSS/IREC/CHEX - Pôle de chirgurgie expérimentale et transplantation
UCL - (SLuc) Service d'urologie
UCL - SSS/IREC/EPID - Pôle d'épidémiologie et biostatistique
Keywords Multiplex ; Pyrosequencing ; Polymorphisms ; Prostate
Links
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Bibliographic reference Ambroise, Jérôme ; Butoescu , Valentina Rodica ; Robert , Annie ; Tombal, Bertrand ; Gala, Jean-Luc. Multiplex pyrosequencing assay using AdvISER-MH-PYRO algorithm: a case for rapid and cost-effective genotyping analysis of prostate cancer risk-associated SNPs.. In: BMC Medical Genetics, Vol. 16, no. 1, p. 42-52 (2015)
Permanent URL http://hdl.handle.net/2078.1/161800