Search results for " reverse transcriptase"

showing 10 items of 85 documents

Molecular surveillance of pandemic influenza A(H1N1) viruses circulating in Italy from May 2009 to February 2010: association between haemagglutinin …

2010

Haemagglutinin sequences of pandemic influenza A(H1N1) viruses circulating in Italy were examined, focusing on amino acid changes at position 222 because of its suggested pathogenic relevance. Among 169 patients, the D222G substitution was detected in three of 52 (5.8%) severe cases and in one of 117 (0.9%) mild cases, whereas the D222E mutation was more frequent and evenly distributed in mild (31.6%) and severe cases (38.4%). A cluster of D222E viruses among school children confirms reported human-to-human transmission of viruses mutated at amino acid position 222.

MaleMolecular surveillance; Pandemic influenza A(H1N1); Haemagglutinin mutations; Italy from May 2009 to February 2010pandemic influenzasurveillance of pandemic influenza A(H1N1); Molecular surveillance; pandemic influenzaEpidemiologyvirusesHaemagglutinin mutationssurveillance of pandemic influenza A(H1N1)Settore MED/42 - Igiene Generale E Applicatamedicine.disease_causeSeverity of Illness IndexInfluenza A Virus H1N1 SubtypePandemic influenza A(H1N1)PandemicInfluenza A VirusA(H1N1)ChildMutationReverse Transcriptase Polymerase Chain ReactionTransmission (medicine)Adolescent; Adult; Age Distribution; Aged; Amino Acid Substitution; Child; Child Preschool; Female; Hemagglutinins; Humans; Infant; Influenza A Virus H1N1 Subtype; Influenza Human; Italy; Male; Middle Aged; Mutation; Population Surveillance; Reverse Transcriptase Polymerase Chain Reaction; Severity of Illness Index; Sex Distribution; Young Adult; PandemicsMiddle AgedItaly from May 2009 to February 2010Molecular surveillance; pandemic influenza; A(H1N1); Italy; haemagglutinin mutationsHemagglutininsMolecular surveillanceItalyChild PreschoolPopulation SurveillanceFemaleHumanAdultAdolescentBiologyDisease clusterDisease courseYoung AdultAge DistributionVirologyInfluenza HumanmedicineHumansH1N1 SubtypeSex DistributionPreschoolhaemagglutinin mutationsPandemicsAgedMolecular epidemiologyPublic Health Environmental and Occupational HealthPandemic influenzaInfantVirologyInfluenzaMutational analysisAmino Acid SubstitutionMutationEurosurveillance
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Declining Prevalence of HIV-1 Drug Resistance in Antiretroviral Treatment-exposed Individuals in Western Europe

2013

HIV-1 drug resistance represents a major obstacle to infection and disease control. This retrospective study analyzes trends and determinants of resistance in antiretroviral treatment (ART)-exposed individuals across 7 countries in Europe. Of 20 323 cases, 80% carried at least one resistance mutation: these declined from 81% in 1997 to 71% in 2008. Predicted extensive 3-class resistance was rare (3.2% considering the cumulative genotype) and peaked at 4.5% in 2005, decreasing thereafter. The proportion of cases exhausting available drug options dropped from 32% in 2000 to 1% in 2008. Reduced risk of resistance over calendar years was confirmed by multivariable analysis. © 2013 The Author.

MaleMultivariate analysisDatabases FactualDrug ResistanceHIV InfectionsDrug resistance0302 clinical medicineRetrospective StudieRisk FactorsEpidemiologyGenotypepol Gene Products Human Immunodeficiency ViruOdds RatioPrevalenceImmunology and AllergyHIV Infection030212 general & internal medicinepol Gene ProductsViralMultivariate Analysimedia_common0303 health sciencesDrug Resistance Prevalence HIV-1Middle AgedResistance mutation3. Good healthReverse Transcriptase InhibitorEuropeInfectious DiseasesReverse Transcriptase InhibitorsepidemiologyFemaleMultipleHuman Immunodeficiency VirusHumanDrugAdultmedicine.medical_specialtyGenotypeEvolutionmedia_common.quotation_subjectSexual Behaviorantiretroviral therapyInfectious DiseaseBiologySettore MED/17 - MALATTIE INFETTIVEEvolution Molecular03 medical and health sciencesDatabasesSDG 3 - Good Health and Well-beingDrug Resistance Multiple ViralmedicineHumansHIV Protease InhibitorFactualRetrospective Studies030306 microbiologyRisk FactorMolecularRetrospective cohort studyOdds ratioHIV Protease InhibitorsCD4 Lymphocyte Countantiretroviral therapy; drug resistance; epidemiology; genotyping; HIV-1; Adult; CD4 Lymphocyte Count; Databases Factual; Europe; Evolution Molecular; Female; Genotype; HIV Infections; HIV Protease Inhibitors; HIV-1; Humans; Male; Middle Aged; Multivariate Analysis; Mutation; Odds Ratio; Prevalence; Retrospective Studies; Reverse Transcriptase Inhibitors; Risk Factors; Sexual Behavior; pol Gene Products Human Immunodeficiency Virus; Drug Resistance Multiple Viral; Immunology and Allergy; Infectious Diseasesgenotypingpol Gene Products Human Immunodeficiency VirusImmunologyMultivariate AnalysisMutationHIV-1DemographyJournal of Infectious Diseases
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Plasma hTERT mRNA discriminates between clinically localized and locally advanced disease and is a predictor of recurrence in prostate cancer patients

2012

Since the introduction of prostate-specific antigen (PSA) testing, new prostate cancer (PCa) patients are diagnosed earlier and most have localized and locally advanced disease. Current diagnosis methods lack specificity and sensitivity, leading to overdiagnosis and overtreatment of patients with low-risk organ-confined localized disease. Therefore, new non-invasive molecular tools are needed to discriminate between localized and locally advanced disease.Plasma telomerase reverse transcriptase (hTERT) mRNA levels were determined by qRT-PCR in 49 patients with localized and locally advanced PCa. Diagnostic accuracy and efficacy as a prognostic factor of biochemical recurrence of plasma hTERT…

MaleOncologyBiochemical recurrencemedicine.medical_specialtyPathologyTelomeraseClinical BiochemistryProstate cancerAntigenRecurrenceInternal medicineDrug DiscoveryBiomarkers TumormedicineHumansTelomerase reverse transcriptaseRNA MessengerOverdiagnosisTelomeraseAgedNeoplasm StagingPharmacologybusiness.industryProstatic NeoplasmsMiddle Agedmedicine.diseaseROC CurveArea Under CurveLocalized diseaseLocally advanced diseasebusinessExpert Opinion on Biological Therapy
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Real-Time Quantification of Human Telomerase Reverse Transcriptase mRNA in the Plasma of Patients with Prostate Cancer

2006

The aim of this study was to evaluate the potential diagnostic value of quantitative analysis of human telomerase reverse transcriptase (hTERT) mRNA in plasma for noninvasive diagnosis of prostate cancer (PCa). Expression levels of hTERT were analyzed by real-time quantitative RT-PCR in 68 patients showing elevated prostate-specific antigen (PSA) levels and a control group of 44 healthy volunteers. Sensitivity and specificity were determined and compared to the corresponding PSA values. Median values for hTERT gene expression in the PCa patients (0.72 ng; range 0.01-12.86) were statistically significantly higher (P < 0.001) than in the control group (0.13 ng; 0.02-0.35). Patients with clini…

MaleOncologyPathologymedicine.medical_specialtyStatistics as TopicProstatitisGeneral Biochemistry Genetics and Molecular BiologyPlasmaProstate cancerHistory and Philosophy of ScienceAntigenProstateInternal medicinemedicineHumansTelomerase reverse transcriptaseRNA MessengerTelomeraseMessenger RNAReverse Transcriptase Polymerase Chain Reactionbusiness.industryGeneral NeuroscienceProstatic Neoplasmsmedicine.diseaseHtert mrnamedicine.anatomical_structurebusinessQuantitative analysis (chemistry)Annals of the New York Academy of Sciences
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Expression of Interleukin-32 in the Inflamed Arteries of Patients With Giant Cell Arteritis

2011

Objective Giant cell (temporal) arteritis (GCA) is a vasculitis that mainly affects the large and medium arteries, especially the branches of the proximal aorta. Interleukin-32 (IL-32) is a recently described Th1 proinflammatory cytokine, and is mainly induced by interferon-γ (IFNγ), IL-1β, and tumor necrosis factor α (TNFα). This study was undertaken to investigate the expression and tissue distribution of IL-32 in artery biopsy specimens from patients with GCA. Methods Quantitative gene expression analysis of IL-32, IL-1β, TNFα, IFNγ, IL-6, and IL-27 was performed in artery biopsy specimens obtained from 18 patients with GCA and 15 controls. Immunohistochemistry analysis was performed to …

MalePathologyInterleukin-1betaMessenger80 and overImmunology and AllergyPharmacology (medical)Giant Cell ArteritiAged 80 and overeducation.field_of_studyReverse Transcriptase Polymerase Chain ReactionInterleukin-17StatisticsArteriesMiddle AgedFlow CytometryImmunohistochemistryTh1 responseFemaleInterleukin 17VasculitisInterleukin-32; Giant Cell Arteritis; Th1 responsemedicine.medical_specialtyGiant Cell ArteritisImmunologyPopulationBiologyStatistics NonparametricProinflammatory cytokineInterferon-gammaRheumatologymedicine.arterymedicineHumansNonparametricRNA MessengerArteritiseducationAgedAortaAged; Aged 80 and over; Arteries; Female; Flow Cytometry; Giant Cell Arteritis; Humans; Immunohistochemistry; Interferon-gamma; Interleukin-17; Interleukin-1beta; Interleukin-6; Interleukins; Male; Middle Aged; RNA Messenger; Reverse Transcriptase Polymerase Chain Reaction; Statistics Nonparametric; Th1 Cells; Tumor Necrosis Factor-alphaInterleukin-6Tumor Necrosis Factor-alphaInterleukinsTh1 Cellsmedicine.diseaseInterleukin-32Giant cell arteritisGiant cellImmunologyRNA
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IL-33 is overexpressed in the inflamed arteries of patients with giant cell arteritis.

2013

OBJECTIVE: To study the expression of interleukin (IL)-33 and to evaluate its relationship with macrophage polarisation in artery biopsy specimens from patients with giant cell arteritis (GCA). METHODS: IL-33, ST2, p-STAT-6 and perivascular IL-1 receptor-associated kinase 1 (p-IRAK1) tissue distribution was evaluated by immunohistochemistry. Inducible nitric oxide synthase and CD163 were also used by immunohistochemistry to evaluate the M1 and M2 polarisation, respectively. Quantitative gene expression analysis of IL-33, T-helper (Th)2-related transcription factor STAT6, Th2 cytokines (IL-4, IL-5, IL-25) and interferon (IFN)-γ was performed in artery biopsy samples obtained from 20 patients…

MalePathologymedicine.medical_specialtyImmunologyGiant Cell ArteritisInflammationGeneral Biochemistry Genetics and Molecular BiologyGiant cell arteritis IL-33 macrophagesRheumatologyGiant cell arteritiImmunology and AllergyMedicineHumansReceptorSTAT6AgedAged 80 and overInflammationAged; Aged 80 and over; Female; Giant Cell Arteritis; Humans; Immunohistochemistry; Inflammation; Interleukins; Male; Middle Aged; Reverse Transcriptase Polymerase Chain Reaction; Temporal Arteries; Transcriptomebusiness.industryReverse Transcriptase Polymerase Chain ReactionInterleukinsInterleukinMiddle Agedmedicine.diseaseInterleukin-33ImmunohistochemistryTemporal ArteriesmacrophagesInterleukin 33Giant cell arteritisIL-33ImmunohistochemistryFemalemedicine.symptombusinessTranscriptomeCD163
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Solitary Fibrous Tumor: Integration of Clinical, Morphologic, Immunohistochemical and Molecular Findings in Risk Stratification and Classification Ma…

2021

Although solitary fibrous tumors (SFTs) have an unpredictable evolution, some specific clinicopathologic factors have been associated with the final outcome. We retrieved clinical, pathological and molecular data of 97 patients with a histological diagnosis of SFT and Signal transducer and activator of transcription 6 (STAT6) positivity. We retrospectively studied the pathological factors predictive of recurrence/metastasis and compared them with the clinical outcome. A wide immunohistochemical study and molecular analysis to detect NAB2/STAT6 gene fusion, tumor protein-53 (TP53) and/or (telomerase reverse transcriptase) TERT promotor mutation were performed. The risk of metastasis was calc…

MalePathologymedicine.medical_specialtySolitary fibrous tumorQH301-705.5CD99CD34APAF-1Risk AssessmentArticleCatalysisMetastasisInorganic ChemistryBiomarkers TumormedicineHumanssolitary fibrous tumorTelomerase reverse transcriptaseBiology (General)risk stratification systemsPhysical and Theoretical ChemistryQD1-999Molecular BiologyPathological<i>p53</i> mutationSpectroscopyRetrospective StudiesSTAT6<i>HTER</i> mutationbusiness.industryOrganic ChemistrySoft tissueGeneral MedicineMiddle AgedPrognosismedicine.diseaseCombined Modality TherapyImmunohistochemistryp53 mutationComputer Science ApplicationsChemistryHTER mutationSolitary Fibrous TumorsImmunohistochemistryFemaleNeoplasm Recurrence LocalbusinessFollow-Up StudiesInternational Journal of Molecular Sciences
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Increase in transmitted resistance to non-nucleoside reverse transcriptase inhibitors among newly diagnosed HIV-1 infections in Europe

2014

Background: One out of ten newly diagnosed patients in Europe was infected with a virus carrying a drug resistant mutation. We analysed the patterns over time for transmitted drug resistance mutations (TDRM) using data from the European Spread program.Methods: Clinical, epidemiological and virological data from 4317 patients newly diagnosed with HIV-1 infection between 2002 and 2007 were analysed. Patients were enrolled using a pre-defined sampling strategy.Results: The overall prevalence of TDRM in this period was 8.9% (95% CI: 8.1-9.8). Interestingly, significant changes over time in TDRM caused by the different drug classes were found. Whereas nucleoside resistance mutations remained con…

Malevirus strainResistanceHIV InfectionsDrug resistanceTHERAPYNucleoside Reverse Transcriptase InhibitorANTIRETROVIRAL DRUG-RESISTANCE0302 clinical medicineMedical microbiologyGenotypeMedicine and Health SciencesPrevalenceHIV Infection030212 general & internal medicineUNITED-KINGDOMPhylogeny0303 health sciencesCommunicable diseaseTransmission (medicine)adultvirus mutationUPDATED RECOMMENDATIONSvirus transmission3. Good healthEuropeInfectious Diseasesfemalerisk factorvirus resistanceFemaleNAIVE PATIENTSSOCIETY-USA PANELResearch ArticleHumanAdultmedicine.medical_specialtyGenotypeAnti-HIV AgentsVirusArticle03 medical and health sciencesSDG 3 - Good Health and Well-beingmaleMOLECULAR EPIDEMIOLOGYDrug Resistance Viralmedicineproteinase inhibitorHumansTransmissioncontrolled studyhumanmolecular phylogeny030304 developmental biologynonhumanMUTATIONSbusiness.industryAnti-HIV Agentnucleotide sequencenonnucleoside reverse transcriptase inhibitorHuman immunodeficiency virus 1 infectionVirologymajor clinical studyunindexed sequenceParasitology3121 General medicine internal medicine and other clinical medicineMutationHIV-1business
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Docking and multivariate methods to explore HIV-1 drug-resistance: a comparative analysis

2007

In this paper we describe a comparative analysis between multivariate and docking methods in the study of the drug resistance to the reverse transcriptase and the protease inhibitors. In our early papers we developed a simple but efficient method to evaluate the features of compounds that are less likely to trigger resistance or are effective against mutant HIV strains, using the multivariate statistical procedures PCA and DA. In the attempt to create a more solid background for the prediction of susceptibility or resistance, we carried out a comparative analysis between our previous multivariate approach and molecular docking study. The intent of this paper is not only to find further supp…

Models MolecularMultivariate statisticsMultivariate analysisAnti-HIV AgentsCombined useHuman immunodeficiency virus (HIV)Computational biologyDrug resistanceBiologyLigandsBioinformaticsmedicine.disease_causeHIV ProteaseMolecular descriptorDrug Resistance ViralDrug DiscoverymedicineHumansDOCKINGPhysical and Theoretical ChemistryBinding SitesHIV Protease InhibitorsSettore CHIM/08 - Chimica FarmaceuticaHIV Reverse TranscriptaseComputer Science ApplicationsDRUG RESISTANCEDocking (molecular)Drug DesignMultivariate AnalysisMutationHIV-1Computer-Aided DesignReverse Transcriptase InhibitorsMultivariate statisticalJournal of Computer-Aided Molecular Design
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The cost of replication fidelity in human immunodeficiency virus type 1.

2006

Mutation rates should be governed by at least three evolutionary factors: the need for beneficial mutations, the benefit of minimizing the mutational load and the cost of replication fidelity. RNA viruses show high mutation rates compared with DNA micro-organisms, and recent findings suggest that the cost of fidelity might play a role in the evolution of increased mutation rates. Here, by analysing previously published data from HIV-1 reverse transcriptase in vitro assays, we show a trade-off between enzymatic accuracy and the maximum rate of polymerization, thus providing a biochemical basis for the fitness cost of fidelity in HIV-1. This trade-off seems to be related to inefficient exten…

Mutation ratemedia_common.quotation_subjectFidelityBiologyVirus ReplicationGeneral Biochemistry Genetics and Molecular BiologyEvolution Molecularchemistry.chemical_compoundGeneral Environmental Sciencemedia_commonGeneticsGeneral Immunology and MicrobiologyRNAGeneral MedicineResistance mutationReverse transcriptaseHIV Reverse TranscriptasechemistryViral replicationMutation (genetic algorithm)DNA ViralMutationHIV-1General Agricultural and Biological SciencesDNAResearch ArticleProceedings. Biological sciences
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