title: Development and optimization of a sensitive TaqMan® real-time PCR with synthetic homologous extrinsic control for quantitation of Human cytomegalovirus viral load.
abstract: Human cytomegalovirus (Human herpesvirus 5, HCMV) causes frequent asymptomatic infections in the general population. However, in immunosuppressed patients or congenitally infected infants, HCMV is related to high morbidity and mortality. In such cases, a rapid viral detection is crucial for monitoring the clinical outcome and the antiviral treatment. In this study, we optimized a sensitive biplex TaqMan® real-time PCR for the simultaneous detection and differentiation of a partial HCMV UL97 sequence and homologous extrinsic control (HEC) in the same tube. HEC was represented by a plasmid containing a modified HCMV sequence retaining the original primer binding sites, while the probe sequence was substituted by a phylogenetically divergent one (chloroplast CF0 subunit plant gene). It was estimated that the optimal HEC concentration, which did not influence the HCMV amplification is 1,000 copies/reaction. The optimized TaqMan® PCR demonstrated high analytical sensitivity (6.97 copies/reaction, CI = 95%) and specificity (100%). Moreover, the reaction showed adequate precision (repeatability, CV = 0.03; reproducibility, CV = 0.0027) and robustness (no carry-over or cross-contamination). The diagnostic sensitivity (100%) and specificity (97.8%) were adequate for the clinical application of the molecular platform. The optimized TaqMan® real-time PCR is suitable for HCMV detection and quantitation in predisposed patients and monitoring of the applied antiviral therapy. J. Med. Virol. 88:1604-1612, 2016. © 2016 Wiley Periodicals, Inc.
authors.affiliation: Faculty of Medicine of Ribeirão Preto, Blood Center of Ribeirão Preto, University of São Paulo, Brazil.|Faculty of Medicine of Ribeirão Preto, Department of Clinical Medicine, University of São Paulo, Brazil.
authors.forename: Svetoslav Nanev
authors.initials: SN
authors.lastname: Slavov
authors.affiliation: Faculty of Medicine of Ribeirão Preto, Blood Center of Ribeirão Preto, University of São Paulo, Brazil.|Faculty of Pharmaceutical Sciences, Department of Clinical, Toxicological and Bromatological Analyses, University of São Paulo, Brazil.
authors.forename: Katia Kaori
authors.initials: KK
authors.lastname: Otaguiri
authors.affiliation: Faculty of Medicine of Ribeirão Preto, Department of Pediatrics, University of São Paulo, Brazil.
authors.forename: Glauciane Garcia
authors.initials: GG
authors.lastname: de Figueiredo
authors.affiliation: Faculty of Medicine of Ribeirão Preto, Department of Pediatrics, University of São Paulo, Brazil.
authors.forename: Aparecida Yulie
authors.initials: AY
authors.lastname: Yamamoto
authors.affiliation: Faculty of Medicine of Ribeirão Preto, Department of Pediatrics, University of São Paulo, Brazil.
authors.forename: Marisa Marcia
authors.initials: MM
authors.lastname: Mussi-Pinhata
authors.affiliation: Faculty of Medicine of Ribeirão Preto, Blood Center of Ribeirão Preto, University of São Paulo, Brazil.|Faculty of Pharmaceutical Sciences, Department of Clinical, Toxicological and Bromatological Analyses, University of São Paulo, Brazil.
authors.forename: Simone
authors.initials: S
authors.lastname: Kashima
authors.affiliation: Faculty of Medicine of Ribeirão Preto, Blood Center of Ribeirão Preto, University of São Paulo, Brazil.|Faculty of Medicine of Ribeirão Preto, Department of Clinical Medicine, University of São Paulo, Brazil.
authors.forename: Dimas Tadeu
authors.initials: DT
authors.lastname: Covas
mesh_terms: D003587:Cytomegalovirus / Q000235:genetics / Q000502:physiology*; D003586:Cytomegalovirus Infections / Q000175:diagnosis* / Q000821:virology*; D017931:DNA Primers; D004279:DNA, Viral / Q000097:blood*; D006801:Humans; D007223:Infant; D060888:Real-Time Polymerase Chain Reaction / Q000379:methods* / Q000592:standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D019562:Viral Load
chemical_list: D017931:DNA Primers; D004279:DNA, Viral
keywords: HCMV; internal controls; molecular detection; optimization