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Torque Teno

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https://www.readbyqxmd.com/read/29143186/identification-of-an-anellovirus-and-genomoviruses-in-ixodid-ticks
#1
Kara Waits, Marten J Edwards, Ilaria N Cobb, Rafaela S Fontenele, Arvind Varsani
Ticks are blood-feeding arachnids that are vectors of several important human and animal pathogens. Little is known about single-stranded DNA (ssDNA) viruses that are associated with these ectoparasites. As part of a pilot study to identify ssDNA viruses present in ticks, female American dog ticks (Dermacentor variabilis) and blacklegged ticks (Ixodes scapularis) were collected in eastern Pennsylvania (USA), and the extracted viral DNA was analyzed using viral metagenomics approaches. Three genomoviruses were recovered from pooled samples of D...
November 15, 2017: Virus Genes
https://www.readbyqxmd.com/read/29103646/comparative-enteric-viruses-and-coliphage-removal-during-wastewater-treatment-processes-in-a-sub-tropical-environment
#2
J P S Sidhu, K Sena, L Hodgers, A Palmer, S Toze
Microbiological safety of reclaimed water is one of the most important issues in managing potential health risks related to wastewater recycling. Presence and removal of human adenovirus (HAdV), human polyomavirus (HPyV), human torque teno virus (HTtV) and somatic coliphage family Microviridae in three wastewater treatment plants (WWTP) in sub-tropical Brisbane, Australia was investigated. All three WWTPs employ activated sludge process with added on Bardenpho process for nutrient removal. HPyV, HAdV, HTtV and Microviridae were consistently detected in the influent (10(5) to 10(6) Genomic copies (GC) L(-1)) and secondary treated effluent (10(2) to 10(3)GCL(-)(1))...
November 2, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29084205/the-kinetics-of-torque-teno-virus-plasma-dna-load-shortly-after-engraftment-predicts-the-risk-of-high-level-cmv-dnaemia-in-allogeneic-hematopoietic-stem-cell-transplant-recipients
#3
E Albert, C Solano, E Giménez, D Focosi, A Pérez, L Macera, J L Piñana, J C H Boluda, F Maggi, D Navarro
Monitoring Torque teno virus (TTV) DNA load helps to estimate the risk of opportunistic infections in solid organ transplant recipients. We investigated whether the early kinetic pattern of plasma TTV DNA load after allogeneic hematopoietic stem cell transplantation (allo-HSCT) associates with subsequent CMV and EBV DNAemia. This study included 71 allo-HSCT patients. We found that the area under the curve (AUC) for log10 TTV DNA loads quantified by days 20 and 30 after transplantation (TTV DNA load AUC20-30), was significantly lower (P=0...
October 30, 2017: Bone Marrow Transplantation
https://www.readbyqxmd.com/read/29083040/metagenomic-analysis-of-viral-diversity-in-respiratory-samples-from-patients-with-respiratory-tract-infections-in-kuwait
#4
N Madi, W Al-Nakib, A S Mustafa, N Habibi
A metagenomic approach based on target independent next-generation sequencing has become a known method for the detection of both known and novel viruses in clinical samples. This study aimed to use the metagenomic sequencing approach to characterise the viral diversity in respiratory samples from patients with respiratory tract infections. We have investigated 86 respiratory samples received from various hospitals in Kuwait between 2015 and 2016 for the diagnosis of respiratory tract infections. A metagenomic approach using the next-generation sequencer to characterise viruses was used...
October 30, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28992518/comprehensive-detection-of-viruses-in-pediatric-patients-with-acute-liver-failure-using-next-generation-sequencing
#5
Takako Suzuki, Jun-Ichi Kawada, Yusuke Okuno, Satoshi Hayano, Kazuhiro Horiba, Yuka Torii, Yoshiyuki Takahashi, Syuichiro Umetsu, Tsuyoshi Sogo, Ayano Inui, Yoshinori Ito
BACKGROUND: Pediatric acute liver failure (PALF) is a rare and severe syndrome that frequently requires liver transplantation. Viruses are one of the most frequent causes of this disease, however, pathogenic viruses are not determined in many patients. Recently next-generation sequencing (NGS) has been applied to comprehensively detect pathogens of infectious diseases of unknown etiology. OBJECTIVES: To evaluate an NGS-based approach for detecting pathogenic viruses in patients with PALF or acute hepatitis of unknown etiology...
October 3, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28972950/phylogenetic-analysis-of-torque-teno-virus-in-thalassemic-children-in-egypt
#6
Noha A Hassuna, Eman Naguib, Medhat Abdel-Fatah, Suzan M Omar Mousa
OBJECTIVE: Torque teno virus (TTV) is a ubiquitous virus that is commonly associated with blood transfusion. The main aims of this study were to evaluate the incidence of TTV in polytransfused children with thalassemia and to determine for the first time the prevalent TTV genotypes in Egypt. METHODS: TTV was detected in 2 groups by nested PCR: the first group comprised 200 children with thalassemia, and the second included age- and sex-matched healthy children with no history of blood transfusion...
October 4, 2017: Intervirology
https://www.readbyqxmd.com/read/28966070/prevalence-of-occult-hepatitis-b-virus-infection-and-torque-teno-virus-infection-and-their-association-with-hepatocellular-carcinoma-in-chronic-hepatitis-c-patients
#7
Agatha S Rosa, Oscar C Araujo, Flavia Savassi-Ribas, Carlos A Fernandes, Henrique S Coelho, Christian Niel, Cristiane A Villela-Nogueira, Natalia M Araujo
BACKGROUND: The role of occult hepatitis B virus (HBV) infection and Torque teno virus (TTV) infection in the development of hepatocellular carcinoma (HCC) in chronic hepatitis C patients is still uncertain. AIM: The aim of the present study was to investigate the prevalence and significance of OBI and TTV infection, and to examine the genetic diversity of these viruses, in chronic hepatitis C patients with and without HCC. METHODS: Sera from 151 hepatitis C virus (HCV)-infected patients (49 patients with HCC and 102 without HCC) negative for HBV surface antigen (HBsAg) were tested for the presence of OBI and TTV infection by semi-nested and group-specific multiplex PCR assays, respectively...
September 29, 2017: Virus Research
https://www.readbyqxmd.com/read/28868270/torque-teno-virus-ttv-among-%C3%AE-thalassemia-and-haemodialysis-patients-in-mazandaran-province-north-of-iran
#8
Hossein Jalali, Mohammad Reza Mahdavi, Najmeh Zaeromali
Torque Teno virus (TTV) is a transfusion transmitted virus that seems to be involved in several complications such as acute respiratory diseases, liver diseases, AIDS, cancer, and autoimmune reactions. In the present study the frequency of TTV was investigated among β- thalassemia (BT) and haemodialysis (HD) patients (high risk patients for TTV) in Mazandaran province, Iran. DNA was extracted from the serum of 82 BT and 100 HD patients, and nested PCR method was applied to detect TTV DNA. The aspartate transaminase(AST) and alanine transaminase (ALT) enzyme levels in BT patients were measured using photometric assay...
2017: International Journal of Molecular and Cellular Medicine
https://www.readbyqxmd.com/read/28866831/detection-of-a-new-species-of-torque-teno-mini-virus-from-the-gingival-epithelium-of-patients-with-periodontitis
#9
Yu Zhang, Fei Li, Xi Chen, Tong-Ling Shan, Xu-Tao Deng, Eric Delwart, Xi-Ping Feng
We describe a novel species of torque teno mini virus called TTMV-204, which was isolated from the gingival epithelium of patients with periodontitis and characterized using viral metagenomics. The sequence of the full genome is 2824 nt in length. Phylogenetic analysis and genetic analyses show classic Betatorquevirus species organization with less than 40% amino acid similarity in ORF1. The prevalence of TTMV-204 in the periodontitis patient population was 18.75% (15/80), which was higher than in periodontally healthy individuals (10...
September 2, 2017: Virus Genes
https://www.readbyqxmd.com/read/28751399/complete-genome-sequence-of-torque-teno-indri-virus-1-a-novel-anellovirus-in-blood-from-a-free-living-lemur
#10
Rina Amatya, Sharon L Deem, Ingrid J Porton, David Wang, Efrem S Lim
We identified Torque teno indri virus 1 (TTIV1), the first anellovirus in a free-living lemur (Indri indri). The complete circular 2,572-nucleotide (nt) TTIV1 genome is distantly related to torque teno sus virus. Phylogenetic and sequence analyses support TTIV1 as a putative member of a new genus within the Anelloviridae family.
July 27, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28744371/diverse-and-highly-recombinant-anelloviruses-associated-with-weddell-seals-in-antarctica
#11
Elizabeth Fahsbender, Jennifer M Burns, Stacy Kim, Simona Kraberger, Greg Frankfurter, Alice A Eilers, Michelle R Shero, Roxanne Beltran, Amy Kirkham, Robert McCorkell, Rachel K Berngartt, Maketalena F Male, Grant Ballard, David G Ainley, Mya Breitbart, Arvind Varsani
The viruses circulating among Antarctic wildlife remain largely unknown. In an effort to identify viruses associated with Weddell seals (Leptonychotes weddellii) inhabiting the Ross Sea, vaginal and nasal swabs, and faecal samples were collected between November 2014 and February 2015. In addition, a Weddell seal kidney and South Polar skua (Stercorarius maccormicki) faeces were opportunistically sampled. Using high throughput sequencing, we identified and recovered 152 anellovirus genomes that share 63-70% genome-wide identities with other pinniped anelloviruses...
January 2017: Virus Evolution
https://www.readbyqxmd.com/read/28725107/retrospective-study-of-the-relationship-of-torque-teno-sus-virus-1a-and-torque-teno-sus-virus-1b-with-porcine-circovirus-associated-disease
#12
Alejandro Vargas-Ruiz, Hugo Ramírez-Álvarez, José I Sánchez-Betancourt, Víctor Quintero-Ramírez, Ignacio C Rangel-Rodríguez, Joel A Vázquez-Perez, Lucia A García-Camacho
Genus Iotatorquevirus consists of 2 species, Torque teno sus virus 1a and Torque teno sus virus 1b, which are ubiquitous in swine populations, and are widely reported in association with porcine circovirus associated disease (PCVAD). To evaluate the relationship with PCVAD, 100 formalin-fixed paraffin-embedded tissue samples were used to detect both Iotatorquevirus species by nested PCR and sequencing. Sixty-eight PCVAD cases were selected as well as 32 porcine circovirus type 2 (PCV2) non-affected cases. Overall, 33 of the 100 cases were positive for Torque teno sus virus 1a and 8 of 100 were positive for Torque teno sus virus 1b...
July 2017: Canadian Journal of Veterinary Research, Revue Canadienne de Recherche Vétérinaire
https://www.readbyqxmd.com/read/28710997/dynamics-of-torque-teno-virus-plasma-dnaemia-in-allogeneic-stem-cell-transplant-recipients
#13
Eliseo Albert, Carlos Solano, Tania Pascual, Ignacio Torres, Lisa Macera, Daniele Focosi, Fabrizio Maggi, Estela Giménez, Paula Amat, David Navarro
BACKGROUND: Torque Teno virus (TTV) plasma DNA load directly correlate with the level of immunosuppresion in different clinical settings. It is uncertain whether this may be the case in allogeneic hematopoietic stem cell transplant recipients (allo-HSCT). OBJECTIVES: We characterized the dynamics of TTV DNAemia in patients undergoing T-cell replete allo-SCT. STUDY DESIGN: Retrospective single-center observational study including 72 allo-HSCT patients...
July 8, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28702856/dynamics-of-torque-teno-virus-viremia-could-predict-risk-of-complications-after-allogeneic-hematopoietic-stem-cell-transplantation
#14
Ramona Gilles, Marco Herling, Udo Holtick, Eva Heger, Sabine Awerkiew, Irina Fish, Konstantin Höller, Saleta Sierra, Elena Knops, Rolf Kaiser, Christof Scheid, Veronica Di Cristanziano
Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is an established treatment option for several hematological diseases. However, the first year post-transplantation is often complicated by infections and graft-versus-host disease (GVHD). Improvements in immunological monitoring could reduce such post-transplant complications. Torque Teno virus (TTV), a chronically persisting DNA virus, is reported to be a marker for immune function in immunocompromised patients. In the present study, the TTV kinetics were analyzed to investigate the potential role of TTV viremia as immune-competence read-out after allo-HSCT...
October 2017: Medical Microbiology and Immunology
https://www.readbyqxmd.com/read/28542207/metagenomic-sequencing-complements-routine-diagnostics-in-identifying-viral-pathogens-in-lung-transplant-recipients-with-unknown-etiology-of-respiratory-infection
#15
Dagmara W Lewandowska, Peter W Schreiber, Macé M Schuurmans, Bettina Ruehe, Osvaldo Zagordi, Cornelia Bayard, Michael Greiner, Fabienne D Geissberger, Riccarda Capaul, Andrea Zbinden, Jürg Böni, Christian Benden, Nicolas J Mueller, Alexandra Trkola, Michael Huber
BACKGROUND: Lung transplant patients are a vulnerable group of immunosuppressed patients that are prone to frequent respiratory infections. We studied 60 episodes of respiratory symptoms in 71 lung transplant patients. Almost half of these episodes were of unknown infectious etiology despite extensive routine diagnostic testing. METHODS: We re-analyzed respiratory samples of all episodes with undetermined etiology in order to detect potential viral pathogens missed/not accounted for in routine diagnostics...
2017: PloS One
https://www.readbyqxmd.com/read/28527409/molecular-characterization-of-pigeon-torque-teno-virus-pttv-in-jiangsu-province
#16
Zhicheng Zhang, Wei Dai, Dingzhen Dai
The torque teno virus (TTV) is a recently discovered DNA virus that has been detected in many different hosts, including humans, livestock and poultry. To date, there is no report of pigeon TTV (PTTV) from anywhere in the world. To investigate the distribution of PTTV in pigeons from the eastern Chinese province of Jiangsu and characterize their genomes, we employed PCR to detect PTTV in 144 samples collected from 6 pigeon plants in Jiangsu province, amplify complete genomes from representative samples and analyze genetic characteristics using bioinformatics...
May 6, 2017: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/28483442/molecular-detection-and-genomic-characterization-of-torque-teno-canis-virus-in-domestic-dogs-in-guangxi-province-china
#17
Wenchao Sun, Changzhan Xie, Cao Liang, Min Zheng, Guanyu Zhao, Ping Zhang, Jicheng Han, Jie Jing, Shubo Wen, Pengpeng Xiao, Zhuodong Cui, Jinyong Zhang, Jingqiang Ren, Hao Liu, Huijun Lu, Ningyi Jin
The Torque teno canis virus (TTCaV) is a small virus with circular single-stranded DNA that has been reported to cause infections in dogs. The present study aimed to identify the presence of TTCaV in blood samples obtained from domestic dogs, and examine its diversity and evolution of the genomes. Five strains of TTCaV were detected, and the overall prevalence was found to be 7% (28/400). Phylogenetic analysis showed that the five genomes were closely clustered with the previously known Cf-TTV10 and LDL strains and formed a Thetatorque virus...
May 5, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28482844/transplacental-transmission-of-torque-teno-virus
#18
Elena A Tyschik, Sophia M Shcherbakova, Ruslan R Ibragimov, Denis V Rebrikov
BACKGROUND: TTV has been detected in almost every human tissue type or body fluid reaching near 100% prevalence. Several studies report mother-to-child postnatal transmission of TTV in infancy but the risk of transplacental transmission of TTV is still unclear. METHODS: The blood and plasma collected postpartum from 100 mother-child pairs were analyzed using TTV-specific qPCR. Samples were collected from the peripheral vein of the mother and the umbilical cord. RESULTS: Eighty four percent of pregnant women were TTV positive (median titers: 8 × 10(4) copies/mL; range: 10(3) - 3 × 10(7))...
May 8, 2017: Virology Journal
https://www.readbyqxmd.com/read/28263221/torque-teno-virus-load-and-acute-rejection-after-orthotopic-liver-transplantation
#19
Federico Simonetta, Amandine Pradier, Stavroula Masouridi-Levrat, Christian van Delden, Emiliano Giostra, Isabelle Morard, Nicolas Mueller, Beat Muellhaupt, Piero V Valli, Nasser Semmo, Jörg Seebach, Yves Chalandon, Laurent Kaiser, Eddy Roosnek
No abstract text is available yet for this article.
July 2017: Transplantation
https://www.readbyqxmd.com/read/27924796/detection-and-phylogenetic-analysis-of-torque-teno-virus-in-salivary-and-tumor-biopsy-samples-from-head-and-neck-carcinoma-patients
#20
Andrea Hettmann, Anett Demcsák, Ádám Bach, Gábor Decsi, Ágnes Dencs, Dóra Pálinkó, László Rovó, Katalin Nagy, Janos Minarovits, Mária Takács
OBJECTIVES: Because torque teno virus (TTV) has been implicated in tumorigenesis as a cocarcinogen, we studied TTV prevalence in saliva and biopsy samples from head and neck cancer (HNCC) patients, patients with premalignant lesions of oral cancer, and controls. We also wished to determine the TTV genotypes in HNCC patients. METHODS: A seminested polymerase chain reaction (PCR) amplifying the N22 region of the TTV genome, as well as direct sequencing of PCR fragments, was used...
2016: Intervirology
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