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Brenier-Pinchart MP, Filisetti D, Cassaing S, Varlet-Marie E, Robert-Gangneux F, Delhaes L, Guitard J, Yéra H, Bastien P, Pelloux H, Sterkers Y. Molecular Diagnosis of Toxoplasmosis: Multicenter Evaluation of the Toxoplasma RealCycler Universal PCR Assay on 168 Characterized Human Samples. J Mol Diagn 2022; 24:687-696. [PMID: 35452843 DOI: 10.1016/j.jmoldx.2022.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 01/20/2022] [Accepted: 03/04/2022] [Indexed: 10/18/2022] Open
Abstract
Real-time PCR plays a crucial role in the diagnosis of toxoplasmosis. In this multicenter study, the Toxoplasma RealCycler Universal assay was assessed for the diagnosis of toxoplasmosis by eight reference laboratories. DNAs from diverse clinical samples were included: 141 characterized samples from patients with different clinical forms of proven toxoplasmosis and 27 from patients without toxoplasmosis were tested in duplicate with the commercial assay. Final diagnosis was affirmed by each center by analysis of clinical settings and biological follow-up. Calibrated Toxoplasma gondii standards and 11 external quality control samples were also included. Discrepant results observed after the first run of commercial PCR were controlled by both reference and commercial PCR assays. Using the commercial assay, the detection threshold varied from 0.01 to 1 tachyzoites/mL, depending on the center. The relationship between crossing point and DNA concentration was linear over 4 log units (r2 > 0.99), and PCR efficiencies were satisfactory (89% to 104%). The results of the 11 external quality control samples were concordant after one retesting, but those for 3 clinical samples remained discrepant. Sensitivity and specificity were calculated at 97.8% (95% CI, 97.8%-100%) and 100% (95% CI, 87.2%-100%), respectively. Provided that PCRs are performed at least in duplicate to detect low parasitic loads, Toxoplasma RealCycler Universal PCR showed suitable performances to diagnose the different forms of toxoplasmosis.
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Affiliation(s)
- Marie-Pierre Brenier-Pinchart
- Parasitology-Mycology Laboratory, Centre Hospitalier Universitaire Grenoble Alpes and University of Grenoble Alpes, Grenoble, France; "Molecular Biology" Pole of the National Reference Center for Toxoplasmosis, Montpellier, France.
| | - Denis Filisetti
- "Molecular Biology" Pole of the National Reference Center for Toxoplasmosis, Montpellier, France; Parasitology-Medical Mycology Laboratory, Parasitology and Tropical Diseases Institute, University Hospitals and University of Strasbourg, Strasbourg, France
| | - Sophie Cassaing
- "Molecular Biology" Pole of the National Reference Center for Toxoplasmosis, Montpellier, France; Parasitology-Mycology Laboratory, Centre Hospitalier Universitaire de Toulouse and University of Toulouse, Toulouse, France
| | - Emmanuelle Varlet-Marie
- "Molecular Biology" Pole of the National Reference Center for Toxoplasmosis, Montpellier, France; Parasitology-Mycology Department, Centre Hospitalier Universitaire de Montpellier, Montpellier, France
| | - Florence Robert-Gangneux
- "Molecular Biology" Pole of the National Reference Center for Toxoplasmosis, Montpellier, France; Centre Hospitalier Universitaire de Rennes and Ecole des Hautes Etudes en Santé Publique, University of Rennes, Rennes, France
| | - Laurence Delhaes
- "Molecular Biology" Pole of the National Reference Center for Toxoplasmosis, Montpellier, France; Parasitology-Mycology Laboratory, Centre Hospitalier Universitaire de Bordeaux and Cardio-Thoracic Research Center, University of Bordeaux, Bordeaux, France
| | - Juliette Guitard
- "Molecular Biology" Pole of the National Reference Center for Toxoplasmosis, Montpellier, France; Parasitology Mycology Department, Saint-Antoine Hospital, Assistance Publique-Hôpitaux de Paris and Saint-Antoine Research Center, Sorbonne University, Paris, France
| | - Hélène Yéra
- "Molecular Biology" Pole of the National Reference Center for Toxoplasmosis, Montpellier, France; Parasitology-Mycology Laboratory, Cochin Hospital, Assistance Publique-Hôpitaux de Paris and University of Paris, Paris, France
| | - Patrick Bastien
- "Molecular Biology" Pole of the National Reference Center for Toxoplasmosis, Montpellier, France; Parasitology-Mycology Department, Centre Hospitalier Universitaire de Montpellier and MiVEGEC, Institut de Recherche pour Le Développement, University of Montpellier, Montpellier, France
| | - Hervé Pelloux
- "Molecular Biology" Pole of the National Reference Center for Toxoplasmosis, Montpellier, France; Parasitology-Mycology Laboratory, Centre Hospitalier Universitaire Grenoble Alpes and University of Grenoble Alpes, Grenoble, France
| | - Yvon Sterkers
- "Molecular Biology" Pole of the National Reference Center for Toxoplasmosis, Montpellier, France; Parasitology-Mycology Department, Centre Hospitalier Universitaire de Montpellier and MiVEGEC, Institut de Recherche pour Le Développement, University of Montpellier, Montpellier, France
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Robert MG, Brenier-Pinchart MP, Garnaud C, Fricker-Hidalgo H, Pelloux H. Molecular diagnosis of toxoplasmosis: recent advances and a look to the future. Expert Rev Anti Infect Ther 2021; 19:1529-1542. [PMID: 34112045 DOI: 10.1080/14787210.2021.1941867] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
INTRODUCTION Toxoplasmosis is a globally distributed parasitic infection that can be particularly severe when opportunistic or congenital. Its diagnosis requires accurate and rapid techniques that rely mainly on serology and molecular methods. AREAS COVERED The aim of this review was to discuss the positioning of the molecular diagnosis of toxoplasmosis according to the different clinical situations possibly resulting from infection with T. gondii, and to detail recent developments in this technique. The English and French literature were searched with the following keywords: 'Toxoplasmosis', "Molecular diagnosis" and 'PCR'. EXPERT OPINION Molecular techniques have revolutionized the diagnosis of toxoplasmosis, and practices have considerably evolved over the past decades. However, there is still a high degree of inter-laboratory heterogeneity which impairs comparisons between results and studies. Efforts to standardize practices are underway.
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Affiliation(s)
- Marie Gladys Robert
- Service de Parasitologie-Mycologie, CHU Grenoble Alpes, Grenoble, France.,Université Grenoble Alpes, Institut pour l'Avancée des Biosciences (IAB), Grenoble, France
| | - Marie-Pierre Brenier-Pinchart
- Service de Parasitologie-Mycologie, CHU Grenoble Alpes, Grenoble, France.,Université Grenoble Alpes, Institut pour l'Avancée des Biosciences (IAB), Grenoble, France.,Centre National de Référence Toxoplasmose - Pôle Biologie Moléculaire, France
| | - Cécile Garnaud
- Service de Parasitologie-Mycologie, CHU Grenoble Alpes, Grenoble, France.,Université Grenoble Alpes, CNRS, CHU Grenoble Alpes, Grenoble INP, TIMC-IMAG, Grenoble, France
| | | | - Hervé Pelloux
- Service de Parasitologie-Mycologie, CHU Grenoble Alpes, Grenoble, France.,Université Grenoble Alpes, Institut pour l'Avancée des Biosciences (IAB), Grenoble, France.,Centre National de Référence Toxoplasmose - Pôle Biologie Moléculaire, France
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Zhou C, Xiao Y, Xie H, Liu S, Wang J. A novel USH2A variant in a patient with hearing loss and prenatal diagnosis of a familial fetus: a case report. BMC Med Genomics 2021; 14:200. [PMID: 34376197 PMCID: PMC8353764 DOI: 10.1186/s12920-021-01052-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2020] [Accepted: 08/05/2021] [Indexed: 11/10/2022] Open
Abstract
Background Usher syndrome (USH) is the most common cause of inherited deaf-blindness. The current study aimed to identify pathogenic variants in a Chinese patient with hearing loss and to report the identification of a novel p.(Phe1583Leufs*10) variant in USH2A, which met the needs of prenatal diagnosis of the patient's mother. Case presentation Genomic DNA obtained from a five-year-old girl with hearing loss was analyzed via the hearing loss-targeted gene panels. We identified the compound heterozygous variants c.8559-2A>G and c.4749delT in Usher syndrome type 2A (USH2A) gene as the underlying cause of the patient; the former variation has been reported in the literature, but not the latter. The parents of the girl were heterozygous carriers. The two variants were classified as pathogenic. Based on these findings, amniotic fluid samples were used for prenatal diagnosis of the couple's fetus, which was found to carry c.4749delT but not c.8559-2A>G variation. During the follow-up period of more than 9 months after the birth of the fetus, it was confirmed that the infant was healthy. Conclusions The results of the present study identified two compound heterozygous USH2A variants in a patient with hearing loss and reported a novel USH2A variant which expands the spectrum of USH2A variants in USH. Supplementary Information The online version contains supplementary material available at 10.1186/s12920-021-01052-4.
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Affiliation(s)
- Cong Zhou
- Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Prenatal Diagnosis Center of Sichuan Province, 20 Section 3 Renmin South Road, Chengdu, 610041, Sichuan, People's Republic of China.,Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, Sichuan University, Chengdu, People's Republic of China
| | - Yuanyuan Xiao
- Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Prenatal Diagnosis Center of Sichuan Province, 20 Section 3 Renmin South Road, Chengdu, 610041, Sichuan, People's Republic of China.,Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, Sichuan University, Chengdu, People's Republic of China
| | - Hanbing Xie
- Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Prenatal Diagnosis Center of Sichuan Province, 20 Section 3 Renmin South Road, Chengdu, 610041, Sichuan, People's Republic of China.,Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, Sichuan University, Chengdu, People's Republic of China
| | - Shanling Liu
- Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Prenatal Diagnosis Center of Sichuan Province, 20 Section 3 Renmin South Road, Chengdu, 610041, Sichuan, People's Republic of China. .,Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, Sichuan University, Chengdu, People's Republic of China.
| | - Jing Wang
- Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Prenatal Diagnosis Center of Sichuan Province, 20 Section 3 Renmin South Road, Chengdu, 610041, Sichuan, People's Republic of China. .,Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, Sichuan University, Chengdu, People's Republic of China.
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Zhao F, Bulin L, Fricker-Hidalgo H, Renaut Q, Robert MG, Garnaud C, Pelloux H, Brenier-Pinchart MP. Molecular diagnosis of toxoplasmosis: evaluation of automated DNA extraction using eMAG® (bioMérieux) on buffy coat, cerebrospinal and bronchoalveolar lavage fluids. ACTA ACUST UNITED AC 2019; 58:e91-e93. [DOI: 10.1515/cclm-2019-0753] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 09/15/2019] [Indexed: 11/15/2022]
Affiliation(s)
- Fanny Zhao
- Parasitology-Mycology Laboratory, Institute of Biology and Pathology , Grenoble-Alpes University Hospital , Grenoble , France
| | - Lionnel Bulin
- Parasitology-Mycology Laboratory, Institute of Biology and Pathology , Grenoble-Alpes University Hospital , Grenoble , France
| | - Hélène Fricker-Hidalgo
- Parasitology-Mycology Laboratory, Institute of Biology and Pathology , Grenoble-Alpes University Hospital , Grenoble , France
| | - Quentin Renaut
- Parasitology-Mycology Laboratory, Institute of Biology and Pathology , Grenoble-Alpes University Hospital , Grenoble , France
| | - Marie Gladys Robert
- Parasitology-Mycology Laboratory, Institute of Biology and Pathology , Grenoble-Alpes University Hospital , Grenoble , France
- Host-Pathogen Interactions and Immunity to Infections, Institute for Advanced Biosciences , Grenoble Alpes University , Grenoble , France
| | - Cécile Garnaud
- Parasitology-Mycology Laboratory, Institute of Biology and Pathology , Grenoble-Alpes University Hospital , Grenoble , France
- TIMC-TheREx , Grenoble Alpes University , Grenoble , France
| | - Hervé Pelloux
- Parasitology-Mycology Laboratory, Institute of Biology and Pathology , Grenoble-Alpes University Hospital , Grenoble , France
- Host-Pathogen Interactions and Immunity to Infections, Institute for Advanced Biosciences , Grenoble Alpes University , Grenoble , France
| | - Marie-Pierre Brenier-Pinchart
- Parasitology-Mycology Laboratory, Institute of Biology and Pathology , Grenoble-Alpes University Hospital , Grenoble , France
- Host-Pathogen Interactions and Immunity to Infections, Institute for Advanced Biosciences, Grenoble Alpes University, INSERMU1209 , CNRS UMR 5309, Grenoble , France
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Roux G, Varlet-Marie E, Bastien P, Sterkers Y. Evolution of Toxoplasma-PCR methods and practices: a French national survey and proposal for technical guidelines. Int J Parasitol 2018; 48:701-707. [DOI: 10.1016/j.ijpara.2018.03.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 02/27/2018] [Accepted: 03/05/2018] [Indexed: 11/15/2022]
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Yera H, Ménégaut L, Brenier-Pinchart MP, Touafek F, Bastien P, Dalle F. Evaluation of five automated and one manual method for Toxoplasma and human DNA extraction from artificially spiked amniotic fluid. Clin Microbiol Infect 2018; 24:1100.e7-1100.e11. [PMID: 29373837 DOI: 10.1016/j.cmi.2018.01.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2017] [Revised: 01/11/2018] [Accepted: 01/13/2018] [Indexed: 11/13/2022]
Abstract
OBJECTIVES Molecular detection of Toxoplasma gondii plays a crucial role in the prenatal and neonatal diagnosis of congenital toxoplasmosis (CT). Sensitivity of this diagnosis is partly related to the efficiency of parasite DNA extraction and amplification. DNA extraction methods with automated platforms have been developed. Therefore, it is essential to evaluate them in combination with adequate PCR amplification assays. METHODS In this multisite study, we investigated the suitability of two recent automated procedures for the isolation of Toxoplasma DNA from amniotic fluid (AF) (Magtration system 12GC, PSS and Freedom EVO VacS, Tecan), compared with three other automated procedures (MagNAPure Compact, Roche, BioRobot EZ1, Qiagen and modified NucliSens easyMAG, bioMérieux) and with the manual DNA extraction QIAamp DNA Mini kit (Qiagen). Two Toxoplasma PCR assays targeting the '529-bp' repeat DNA element were used, based upon dual hybridization (FRET) or hydrolysis (TaqMan) probes. A total of 1296 PCRs were performed including 972 Toxoplasma PCRs. RESULTS We showed variable efficacy (4.2%-100% positive results) among the DNA extraction procedures in isolating up to five T. gondii cells/mL in AF samples. Moreover, for a given DNA extraction method, variable results were obtained among the two Toxoplasma PCR assays for detecting up to five T. gondii cells/mL: when using TaqMan PCR, all the automated systems yielded more than 60% positive results. Nevertheless, when testing the DNA extracts in triplicate, four out of six extraction methods allowed a satisfactory detection of low amounts of T. gondii DNA (≥33% of positive results) independently of the PCR assay used. CONCLUSIONS Despite the influence of the subsequent PCR method used, this study should help microbiologists in the choice of DNA extraction methods for the detection of T. gondii in amniotic fluid. The extraction method should be checked as adequate for the PCR assay used.
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Affiliation(s)
- H Yera
- Université Paris Descartes, AP-HP, Hôpitaux Universitaires Paris Centre, Hôpital Cochin, Laboratory of Parasitology-Mycology, Paris, France; Molecular Biology study group of the French National Reference Centre for Toxoplasmosis, France.
| | - L Ménégaut
- Centre Hospitalier Universitaire de Dijon, Laboratory of Parasitology-Mycology, Dijon, France
| | - M-P Brenier-Pinchart
- Molecular Biology study group of the French National Reference Centre for Toxoplasmosis, France; Centre Hospitalier Universitaire de Grenoble, Université Grenoble Alpes, Laboratory of Parasitology-Mycology, Department of Infectious Agents, Grenoble, France
| | - F Touafek
- Molecular Biology study group of the French National Reference Centre for Toxoplasmosis, France; AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Laboratory of Parasitology-Mycology, Paris, France
| | - P Bastien
- Molecular Biology study group of the French National Reference Centre for Toxoplasmosis, France; Centre Hospitalier Universitaire de Montpellier, Université de Montpellier, Laboratory of Parasitology-Mycology, Montpellier, France
| | - F Dalle
- Molecular Biology study group of the French National Reference Centre for Toxoplasmosis, France; Centre Hospitalier Universitaire de Dijon, Laboratory of Parasitology-Mycology, Dijon, France; UMR PAM, Agrosup, Université de Bourgogne-Franche Comté, Dijon, France
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7
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Kerambrun E, Palos Ladeiro M, Bigot-Clivot A, Dedourge-Geffard O, Dupuis E, Villena I, Aubert D, Geffard A. Zebra mussel as a new tool to show evidence of freshwater contamination by waterborne Toxoplasma gondii. J Appl Microbiol 2016; 120:498-508. [DOI: 10.1111/jam.12999] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 10/01/2015] [Accepted: 10/23/2015] [Indexed: 01/01/2023]
Affiliation(s)
- E. Kerambrun
- Unité Stress Environnementaux et Biosurveillance des milieux aquatiques; UMR-I 02 (SEBIO); Université de Reims Champagne Ardenne; Reims France
| | - M. Palos Ladeiro
- Unité Stress Environnementaux et Biosurveillance des milieux aquatiques; UMR-I 02 (SEBIO); Université de Reims Champagne Ardenne; Reims France
- Laboratoire de Parasitologie-Mycologie; EA 3800 SFR CAP-Santé FED 4231; Hôpital Maison Blanche; Reims France
| | - A. Bigot-Clivot
- Unité Stress Environnementaux et Biosurveillance des milieux aquatiques; UMR-I 02 (SEBIO); Université de Reims Champagne Ardenne; Reims France
| | - O. Dedourge-Geffard
- Unité Stress Environnementaux et Biosurveillance des milieux aquatiques; UMR-I 02 (SEBIO); Université de Reims Champagne Ardenne; Reims France
| | - E. Dupuis
- Laboratoire de Parasitologie-Mycologie; EA 3800 SFR CAP-Santé FED 4231; Hôpital Maison Blanche; Reims France
| | - I. Villena
- Laboratoire de Parasitologie-Mycologie; EA 3800 SFR CAP-Santé FED 4231; Hôpital Maison Blanche; Reims France
| | - D. Aubert
- Laboratoire de Parasitologie-Mycologie; EA 3800 SFR CAP-Santé FED 4231; Hôpital Maison Blanche; Reims France
| | - A. Geffard
- Unité Stress Environnementaux et Biosurveillance des milieux aquatiques; UMR-I 02 (SEBIO); Université de Reims Champagne Ardenne; Reims France
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Comparison of mother and child antibodies that target high-molecular-mass Toxoplasma gondii antigens by immunoblotting improves neonatal diagnosis of congenital toxoplasmosis. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2012; 19:1326-8. [PMID: 22695159 DOI: 10.1128/cvi.00060-12] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
This retrospective study proposes a new reading of immunoblotting (IB) in the diagnosis of congenital toxoplasmosis. Our findings demonstrate that a three-IgM-band association at 75, 90, and 100 kDa called the IgM triplet increases the sensitivity to 95.8% when combined with prenatal and serological neonatal tests.
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