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Torque Teno

Sriraman Priyanka, Gurumoorthy Kaarthikeyan, Jayakumar Doraiswamy Nadathur, Anbarasu Mohanraj, Avinash Kavarthapu
Background: Periodontitis and atherosclerosis represent a chronic inflammatory process. The incidence of periodontitis in cardiac patients with atherosclerosis is a well-established fact. The role of viruses in the etiopathogenesis of both has been proposed. Aim: The aim of the study was to evaluate the prevalence of Torque Teno virus (TTV), Epstein-Barr virus (EBV), and cytomegalovirus (CMV) in cardiac patients with atherosclerosis and coexisting chronic periodontitis (CP)...
November 2017: Journal of Indian Society of Periodontology
Tetsuro Sawata, Masashi Bando, Masayuki Nakayama, Naoko Mato, Hideaki Yamasawa, Masaharu Takahashi, Hiroaki Okamoto, Yukihiko Sugiyama
BACKGROUND: Several studies have reported that viral infections are related to lung cancer. We previously reported the involvement of Torque teno virus (TTV) in patients with lung cancer and idiopathic pulmonary fibrosis. However, the role of TTV in lung cancer growth, and its influence on changes in TTV DNA titers due to idiopathic pulmonary fibrosis (IPF) in lung cancer patients are poorly understood. METHODS: Serum TTV DNA titers were measured in serum samples obtained from patients with lung cancer...
March 2018: Respiratory Investigation
Gagandeep Singh, Sheela Ramamoorthy
Torque teno viruses [TTVs] are negative sense, single-stranded, DNA viruses, which are distributed globally in several mammalian hosts such as humans, apes, sheep and swine in a species-specific manner. While the pathogenic potential of TTVs is under debate, recent experimental studies in gnotobiotic pigs indicate that swine TTVs, TTSuV1 in particular, can act as a primary or co-infecting pathogen. Hence, determining whether TTSuV1 can infect other mammals would eventually further our understanding of viral pathogenesis, especially in coinfections...
February 2018: Veterinary Microbiology
Yi-Quan Xiong, Yun Mo, Ming-Ji Chen, Wei Cai, Wen-Qiao He, Qing Chen
Between May 2015 and May 2017, 496 animals (473 murine rodents and 23 house shrews) were captured in six regions of China. A total of 22.8% (113/496) of throat swabs, 29.1% (142/488) of fecal samples and 23.8% (54/227) of serum samples tested positive for rodent torque teno virus 3 (RoTTV3). The positive rate in Rattus norvegicus was higher than the rate in Rattus tanezumi and Rattus losea. Of 23 house shrews, one throat swab and one serum sample were positive for RoTTV3. Ten murine rodents were simultaneously positive for RoTTV3 in throat swab, fecal and serum samples...
January 30, 2018: Virology
Mauricio Barrientos-Somarribas, David N Messina, Christian Pou, Fredrik Lysholm, Annelie Bjerkner, Tobias Allander, Björn Andersson, Erik L L Sonnhammer
Massive amounts of metagenomics data are currently being produced, and in all such projects a sizeable fraction of the resulting data shows no or little homology to known sequences. It is likely that this fraction contains novel viruses, but identification is challenging since they frequently lack homology to known viruses. To overcome this problem, we developed a strategy to detect ORFan protein families in shotgun metagenomics data, using similarity-based clustering and a set of filters to extract bona fide protein families...
January 8, 2018: Scientific Reports
S Zheng, J Shi, X Wu, Z Peng, C Xin, L Zhang, Y Liu, M Gao, S Xu, H Han, J Yu, W Sun, X Cong, J Li, J Wang
In this study, the co-infection of Torque teno sus virus (TTSuV) and porcine circovirus type 3 (PCV3) was reported. One hundred and ten of 132 (83.3%) PCV3-positive samples were co-infected with Torque teno sus virus 1 (TTSuV1). Ninety-four of 132 (71.2%) PCV3-positive samples were co-infected with Torque teno sus virus 2 (TTSuV2). Sixty-six of 132 (50.0%) of PCV3-positive samples were co-infected with both TTSuV1 and TTSuV2. There were no clinical signs of infection in pigs that were both PCV3-positive and PCV2-negative, in either multiparous sows or live-born infants...
December 28, 2017: Transboundary and Emerging Diseases
Terry Fei Fan Ng, Jennifer A Dill, Alvin C Camus, Eric Delwart, Erwin G Van Meir
The role of viral infections in the etiology of brain cancer remains uncertain. Prior studies mostly focused on transcriptome or viral DNA integrated in tumor cells. To investigate for the presence of viral particles, we performed metagenomics sequencing on viral capsid-protected nucleic acids from 12 primary and 8 metastatic human brain tumors. One brain tumor metastasized from a skin melanoma harbored two new human anellovirus species, Torque teno mini virus Emory1 (TTMV Emory1) and Emory2 (TTMV Emory2), while the remaining 19 samples did not reveal any exogenous viral sequences...
December 1, 2017: Oncotarget
Mani Ramzi, Mahdiyar Iravani Saadi, Tahereh Zarei, Ramin Yaghobi, Nargess Arandi
OBJECTIVES: An association between costimulatory molecule gene polymorphisms and viral infection after hematopoietic stem cell transplantation may be related to clinical outcomes, especially acute graft-versus-host disease. Cytotoxic T-lymphocyte antigen 4 has been suggested as a crucial negative regulator of the immune system. In this study, our objective was to investigate the association between cytotoxic T-lymphocyte antigen-4 gene polymorphisms (including -1722 T/C, -1661 A/G, -318 C/T, and +49 A/G) and torque teno virus infection after hematopoietic stem cell transplantation in patients with and without acute graft-versus-host disease...
December 18, 2017: Experimental and Clinical Transplantation
Sam Davila, E Scott Halstead, Mark W Hall, Allan Doctor, Russell Telford, Richard Holubkov, Joseph A Carcillo, Gregory A Storch
OBJECTIVES: Demonstrate that DNA viremia is common in pediatric sepsis and quantitate its associations with host immune function and secondary infection risk. DESIGN: Retrospective analysis of a prospective cohort study. PATIENTS: Seventy-three children admitted with sepsis-induced organ failure. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: This study was performed as an ancillary investigation to a single-center prospective study of children with severe sepsis...
January 2018: Pediatric Critical Care Medicine
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
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
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
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
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
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
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
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
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...
December 2017: Virus Genes
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
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
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