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Torque Teno

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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
#1
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
#2
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
#3
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
#4
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
#5
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...
July 12, 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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
https://www.readbyqxmd.com/read/27878979/prevalence-of-the-novel-torque-teno-sus-virus-species-k2b-from-pigs-in-the-united-states-and-lack-of-association-with-post-weaning-multisystemic-wasting-syndrome-or-mulberry-heart-disease
#12
A J Rogers, Y-W Huang, C L Heffron, T Opriessnig, A R Patterson, X-J Meng
The family Anelloviridae includes a number of viruses infecting humans (Torque teno viruses, TTV) and other animals including swine (Torque teno sus viruses, TTSuV). Two genetically distinct TTSuV species have been identified from swine thus far (TTSuV1 and TTSuVk2), although their definitive association with disease remains debatable. In 2012, a novel TTSuV species was identified from commercial swine serum and classified in the genus Kappatorquevirus as TTSuVk2b. The other Kappatorquevirus species, TTSuVk2a, has been associated with post-weaning multisystemic wasting syndrome (PMWS) when coinfected with porcine circovirus type 2 (PCV2)...
November 23, 2016: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/27833640/molecular-detection-of-torque-teno-sus-virus-and-coinfection-with-african-swine-fever-virus-in-blood-samples-of-pigs-from-some-slaughterhouses-in-nigeria
#13
Pam D Luka, Joseph Erume, Bitrus Yakubu, Olajide A Owolodun, David Shamaki, Frank N Mwiine
Torque teno sus virus 1 (TTSuV1a/TTSuV1b) infection is present in pig herds worldwide. This study investigated the prevalence of TTSuV1a/TTSuV1b infections in domestic pigs from some slaughterhouses in Nigeria as well as coinfection with African swine fever virus (ASFV) and described the phylogeny in relation to global strains. One hundred and eighty-one (181) blood samples from four slaughterhouses were used for the study and viral nucleic acid detection was carried out by PCR. Comparative sequence analysis was carried out to infer phylogeny...
2016: Advances in Virology
https://www.readbyqxmd.com/read/27771061/clinical-aspects-and-weight-gain-reduction-in-swine-infected-with-porcine-circovirus-type-2-and-torque-teno-sus-virus-in-brazil
#14
Ana Claudia de Menezes Cruz, Renato Luiz Silveira, Camila Freze Baez, Rafael Brandão Varella, Tatiana Xavier de Castro
Simultaneous Porcine circovirus type 2 (PCV-2) and Torque teno sus virus (TTSuV) infections have been reported around the world, generally linked to severe infections. In the present study, 257 swine plasma samples from 31 swine herds located in Brazil, were PCR screened for PCV-2 and TTSuV-1/2 and correlated with clinical data. PCV-2 was detected in 25%, followed by 38.1% and 42.4% of TTSuV-1 and TTSuV-2, respectively. Co-infections of two or three viruses were found in 32.3% of samples. PCV-2 was more frequently detected in the growing (p=0...
November 15, 2016: Veterinary Microbiology
https://www.readbyqxmd.com/read/27731934/the-perioperative-lung-transplant-virome-torque-teno-viruses-are-elevated-in-donor-lungs-and-show-divergent-dynamics-in-primary-graft-dysfunction
#15
A A Abbas, J M Diamond, C Chehoud, B Chang, J J Kotzin, J C Young, I Imai, A R Haas, E Cantu, D J Lederer, K C Meyer, R K Milewski, K M Olthoff, A Shaked, J D Christie, F D Bushman, R G Collman
Primary graft dysfunction (PGD) is a principal cause of early morbidity and mortality after lung transplantation, but its pathogenic mechanisms are not fully clarified. To date, studies using standard clinical assays have not linked microbial factors to PGD. We previously used comprehensive metagenomic methods to characterize viruses in lung allografts >1 mo after transplant and found that levels of Anellovirus, mainly torque teno viruses (TTVs), were significantly higher than in nontransplanted healthy controls...
May 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/27699405/paucibacterial-microbiome-and-resident-dna-virome-of-the-healthy-conjunctiva
#16
Thuy Doan, Lakshmi Akileswaran, Dallin Andersen, Benjamin Johnson, Narae Ko, Angira Shrestha, Valery Shestopalov, Cecilia S Lee, Aaron Y Lee, Russell N Van Gelder
Purpose: To characterize the ocular surface microbiome of healthy volunteers using a combination of microbial culture and high-throughput DNA sequencing techniques. Methods: Conjunctival swab samples from 107 healthy volunteers were analyzed by bacterial culture, 16S rDNA gene deep sequencing (n = 89), and biome representational in silico karyotyping (BRiSK; n = 80). Swab samples of the facial skin (n = 42), buccal mucosa (n = 50), and environmental controls (n = 27) were processed in parallel...
October 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27633952/a-diverse-virome-in-kidney-transplant-patients-contains-multiple-viral-subtypes-with-distinct-polymorphisms
#17
Asha Rani, Ravi Ranjan, Halvor S McGee, Ahmed Metwally, Zahraa Hajjiri, Daniel C Brennan, Patricia W Finn, David L Perkins
Recent studies have established that the human urine contains a complex microbiome, including a virome about which little is known. Following immunosuppression in kidney transplant patients, BK polyomavirus (BKV) has been shown to induce nephropathy (BKVN), decreasing graft survival. In this study we investigated the urine virome profile of BKV+ and BKV- kidney transplant recipients. Virus-like particles were stained to confirm the presence of VLP in the urine samples. Metagenomic DNA was purified, and the virome profile was analyzed using metagenomic shotgun sequencing...
September 16, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27625312/identification-of-viruses-in-cases-of-pediatric-acute-encephalitis-and-encephalopathy-using-next-generation-sequencing
#18
Jun-Ichi Kawada, Yusuke Okuno, Yuka Torii, Ryo Okada, Satoshi Hayano, Shotaro Ando, Yasuko Kamiya, Seiji Kojima, Yoshinori Ito
Acute encephalitis/encephalopathy is a severe neurological syndrome that is occasionally associated with viral infection. Comprehensive virus detection assays are desirable because viral pathogens have not been identified in many cases. We evaluated the utility of next-generation sequencing (NGS) for detecting viruses in clinical samples of encephalitis/encephalopathy patients. We first determined the sensitivity and quantitative performance of NGS by comparing the NGS-determined number of sequences of human herpesvirus-6 (HHV-6) in clinical serum samples with the HHV-6 load measured using real-time PCR...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27525643/torque-teno-virus-load-inverse-association-with-antibody-mediated-rejection-after-kidney-transplantation
#19
Martin Schiemann, Elisabeth Puchhammer-Stöckl, Farsad Eskandary, Philip Kohlbeck, Susanne Rasoul-Rockenschaub, Andreas Heilos, Nicolas Kozakowski, Irene Görzer, Željko Kikić, Harald Herkner, Georg A Böhmig, Gregor Bond
BACKGROUND: Antibody-mediated rejection (AMR) represents one of the cardinal causes of late allograft loss after kidney transplantation, and there is great need for noninvasive tools improving early diagnosis of this rejection type. One promising strategy might be the quantification of peripheral blood DNA levels of the highly prevalent and apathogenic Torque Teno virus (TTV), which might mirror the overall level of immunosuppression and thus help determine the risk of alloimmune response...
February 2017: Transplantation
https://www.readbyqxmd.com/read/27510954/detection-and-molecular-characterization-of-torque-teno-virus-ttv-in-uruguay
#20
Florencia Cancela, Natalia Ramos, Santiago Mirazo, Victoria Mainardi, Solange Gerona, Juan Arbiza
Torque Teno Virus (TTV), member of Anelloviridae family, is considered a worldwide distributed emergent virus and is currently classified into seven genogroups. Interestingly, the pathogenicity of TTV remains unclear. However, it has been constantly associated to hepatitis cases of unknown etiology (HUE) as well as extensively studied in concurrent infections with Hepatitis B Virus (HBV), Hepatitis C Virus (HCV) and Human Immunodeficiency Virus type 1 (HIV-1). In South America, TTV epidemiological data is scant, involving some studies from Brazil, Venezuela, Colombia and Bolivia...
October 2016: Infection, Genetics and Evolution
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