51
views
0
recommends
+1 Recommend
1 collections
    1
    shares

      Authors - did you know Parasite has been awarded the DOAJ Seal for “best practice in open access publishing”?

      • 3.020 2021 Impact Factor
      • Rapid publication and moderate publication fee
      • Creative Commons license
      • Long articles welcome – no page limits

      Instructions for authors, online submissions and free e-mail alerts all available at parasite-journal.org

      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Molecular diagnosis of alveolar echinococcosis in patients based on frozen and formalin-fixed paraffin-embedded tissue samples Translated title: Diagnostic moléculaire de l’échinococcose alvéolaire chez les patients à partir d’échantillons de tissus congelés et fixés au formol et inclus en paraffine

      research-article

      Read this article at

      ScienceOpenPublisherPMC
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Confirmed diagnosis of alveolar echinococcosis (AE) is based on pathological criteria and molecular evidence. This parasite-borne disease, caused by the cestode Echinococcus multilocularis, sparingly involves humans as a dead-end host. In humans, the parasite mainly colonizes the liver but can colonize any organ and cause atypical forms, often difficult to characterize clinically. Moreover, molecular methods may be suitable to make the diagnosis of AE in cases of atypical forms, extra-hepatic localizations, or immunosuppressed patients. The aim of this study was to determine the most relevant published PCR techniques, for diagnosis of AE in patients and adopt the best strategy for molecular diagnosis depending on the nature of the tested sample. In this study, we evaluated nine end-point PCR assays and one real-time PCR assay (qPCR), targeting mitochondrial genes, using a total of 89 frozen or formalin-fixed paraffin-embedded (FFPE) samples from either 48 AE or 9 cystic echinococcosis patients. Targeted fragment-genes ranged from 84 to 529 bp. Six PCR assays were able to amplify the DNA of 100% of the frozen AE-samples and for one PCR, 69.8% of the FFPE AE-samples. The 16S rrnL PCR (84 bp) was positive in PCR for 77% of the AE samples and in qPCR for 86.5%. The sensitivity of the PCR assays was higher for fresh samples and FFPE samples stored for less than 5 years. The qPCR assay further increased sensitivity for the tested samples, confirming the need for the development of an Echinococcus spp. qPCR to improve the molecular diagnosis of echinococcoses.

          Translated abstract

          La confirmation diagnostique de l’échinococcose alvéolaire (EA) est basée sur des critères anatomo-pathologiques et moléculaires. Cette maladie d’origine parasitaire, causée par le cestode Echinococcus multilocularis, implique sporadiquement l’homme, impasse parasitaire. Chez l’homme, le parasite colonise principalement le foie mais peut coloniser tout organe et causer des formes atypiques, souvent difficiles à caractériser cliniquement. En outre, les méthodes moléculaires permettent de réaliser le diagnostic de l’EA dans les formes atypiques, les localisations extra-hépatiques ou chez les patients immunodéprimés. Le but de cette étude était de déterminer les techniques PCR publiées les plus pertinentes, pour le diagnostic de l’EA chez les patients et adopter la meilleure stratégie par diagnostic moléculaire en fonction de la nature de l’échantillon testé. Dans cette étude nous avons évalué neuf PCR en point-final et une PCR-temps-réel (qPCR), ciblant des gènes mitochondriaux, utilisant 89 échantillons congelés ou fixés en paraffine (FFPE) de patients EA (n = 48) ou présentant une échinococcose kystique (n = 9). Les fragments de gènes ciblés allaient de 84 à 529 pb. Six tests PCR ont permis d’amplifier l’ADN de 100 % des échantillons EA congelés, et pour une PCR, 69,8 % des échantillons EA-FFPE. La PCR 16S rrnL (84 pb) était positive en PCR pour 77 % des échantillons EA et en qPCR pour 86,5 %. La sensibilité des tests PCR était plus importante pour les échantillons congelés et les FFPE stockés moins de 5 ans. Le test qPCR a permis d’augmenter la sensibilité pour les échantillons testés, confirmant le besoin de développement d’une qPCR Echinococcus spp. pour améliorer le diagnostic moléculaire des échinococcoses.

          Related collections

          Most cited references41

          • Record: found
          • Abstract: found
          • Article: not found

          Echinococcosis: Advances in the 21st Century

          SUMMARY Echinococcosis is a zoonosis caused by cestodes of the genus Echinococcus (family Taeniidae). This serious and near-cosmopolitan disease continues to be a significant public health issue, with western China being the area of highest endemicity for both the cystic (CE) and alveolar (AE) forms of echinococcosis. Considerable advances have been made in the 21st century on the genetics, genomics, and molecular epidemiology of the causative parasites, on diagnostic tools, and on treatment techniques and control strategies, including the development and deployment of vaccines. In terms of surgery, new procedures have superseded traditional techniques, and total cystectomy in CE, ex vivo resection with autotransplantation in AE, and percutaneous and perendoscopic procedures in both diseases have improved treatment efficacy and the quality of life of patients. In this review, we summarize recent progress on the biology, epidemiology, diagnosis, management, control, and prevention of CE and AE. Currently there is no alternative drug to albendazole to treat echinococcosis, and new compounds are required urgently. Recently acquired genomic and proteomic information can provide a platform for improving diagnosis and for finding new drug and vaccine targets, with direct impact in the future on the control of echinococcosis, which continues to be a global challenge.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found
            Is Open Access

            Expert consensus for the diagnosis and treatment of cystic and alveolar echinococcosis in humans.

            The earlier recommendations of the WHO-Informal Working Group on Echinococcosis (WHO-IWGE) for the treatment of human echinococcosis have had considerable impact in different settings worldwide, but the last major revision was published more than 10 years ago. Advances in classification and treatment of echinococcosis prompted experts from different continents to review the current literature, discuss recent achievements and provide a consensus on diagnosis, treatment and follow-up. Among the recognized species, two are of medical importance -Echinococcus granulosus and Echinococcus multilocularis - causing cystic echinococcosis (CE) and alveolar echinococcosis (AE), respectively. For CE, consensus has been obtained on an image-based, stage-specific approach, which is helpful for choosing one of the following options: (1) percutaneous treatment, (2) surgery, (3) anti-infective drug treatment or (4) watch and wait. Clinical decision-making depends also on setting-specific aspects. The usage of an imaging-based classification system is highly recommended. For AE, early diagnosis and radical (tumour-like) surgery followed by anti-infective prophylaxis with albendazole remains one of the key elements. However, most patients with AE are diagnosed at a later stage, when radical surgery (distance of larval to liver tissue of >2cm) cannot be achieved. The backbone of AE treatment remains the continuous medical treatment with albendazole, and if necessary, individualized interventional measures. With this approach, the prognosis can be improved for the majority of patients with AE. The consensus of experts under the aegis of the WHO-IWGE will help promote studies that provide missing evidence to be included in the next update. Copyright 2009 Elsevier B.V. All rights reserved.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Genetic variants within the genus Echinococcus identified by mitochondrial DNA sequencing.

              The pattern of species and strain variation within the genus Echinococcus is complex and controversial. In an attempt to characterise objectively the various species and strains, the sequence of a region of the mitochondrial cytochrome c oxidase subunit I (CO1) gene was determined for 56 Echinococcus isolates. Eleven different genotypes were detected, including 7 within Echinococcus granulosus, and these were used to categorise the isolates. The 4 generally accepted Echinococcus species were clearly distinguishable using this approach. In addition, the consensus view of the strain pattern within E. granulosus, based on a variety of criteria of differentiation, was broadly upheld. Very little variation was detected within Echinococcus multilocularis. Remarkable intra-strain homogeneity was found at the DNA sequence level. This region of the rapidly evolving mitochondrial genome is useful as a marker of species and strain identity and as a preliminary indication of evolutionary divergence within the genus Echinococcus.
                Bookmark

                Author and article information

                Journal
                Parasite
                Parasite
                parasite
                Parasite
                EDP Sciences
                1252-607X
                1776-1042
                2022
                02 February 2022
                : 29
                : ( publisher-idID: parasite/2022/01 )
                : 4
                Affiliations
                [1 ] Department of Parasitology-Mycology, National Reference Centre for Echinococcoses, University Hospital of Besançon 25030 Besançon France
                [2 ] UMR CNRS 6249 Laboratoire Chrono-environnement, Université Bourgogne-Franche-Comté 16 Route de Gray 25030 Besançon France
                [3 ] Department of Pathology, University Hospital of Besançon 25030 Besançon France
                [4 ] Department of Pathology, University Hospital of Grenoble-Alps 38043 Grenoble France
                [5 ] Visceral, Digestive and Cancer Surgery, Hepatic Transplantation Unit, University Hospital of Besançon 25030 Besançon France
                [6 ] Department of Digestive Surgery, Hepato-Biliary-Pancreatic and Liver Transplantation, AP-HP Pitié-Salpêtrière Hospital – Charles-Foix 75651 Paris France
                [7 ] Department of Hepatology, University Hospital of Besançon 25030 Besançon France
                Author notes
                [a]

                J. Knapp and S. Lallemand contributed equally to this work.

                [* ]Corresponding author: jknapp@ 123456univ-fcomte.fr
                Article
                parasite210093 10.1051/parasite/2022004
                10.1051/parasite/2022004
                8812296
                35113014
                62fd9fa4-08cb-4462-821d-16e907eee4e7
                © J. Knapp et al., published by EDP Sciences, 2022

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 16 July 2021
                : 14 January 2022
                Page count
                Figures: 6, Tables: 4, Equations: 0, References: 41, Pages: 13
                Funding
                Funded by: agence santé publique france
                Categories
                Research Article

                echinococcus multilocularis,molecular diagnosis,fresh material,ffpe,end-point pcr,qpcr

                Comments

                Comment on this article