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Evolution and tuberculosis

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https://www.readbyqxmd.com/read/28391322/evolutionary-thrift-mycobacteria-repurpose-plasmid-diversity-during-adaptation-of-type-vii-secretion-systems
#1
Tatum D Mortimer, Alexandra M Weber, Caitlin S Pepperell
Mycobacteria have a distinct secretion system, termed type VII (T7SS), which is encoded by paralogous chromosomal loci (ESX) and associated with pathogenesis, conjugation, and metal homeostasis. Evolution of paralogous gene families is of interest because duplication is an important mechanism by which novel genes evolve, but there are potential conflicts between adaptive forces that stabilize duplications and those that enable evolution of new functions. Our objective was to delineate the adaptive forces underlying diversification of T7SS...
March 1, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28380170/-hotels-and-sanatoria-the-influence-of-tuberculosis-on-mass-tourism-architecture
#2
Eduardo Jiménez Morales, Ingrid Carolina Vargas Díaz
The aim of this article is to verify the influence of tuberculosis on mass tourism architecture. To achieve this, the paper analyses the typological evolution of the hotel since the middle of the nineteenth century, when the first sanatoria appeared in the alpine resorts. A study that creates links between the progress in architecture and the medical therapy advances. The goal is to highlight the hybridisation process between both architectural typologies. Although this overlapping is developed until the Second World War, the influence of its mixture is still present in contemporary mass tourism architecture...
January 2017: História, Ciências, Saúde—Manguinhos
https://www.readbyqxmd.com/read/28369607/the-influence-of-hiv-on-the-evolution-of-mycobacterium-tuberculosis
#3
Anastasia Koch, Daniela Brites, David Stucki, Joanna C Evans, Ronnett Seldon, Alexa Heekes, Nicola Mulder, Mark Nicol, Tolu Oni, Digby F Warner, Valerie Mizrahi, Julian Parkhill, Sebastien Gagneux, Darren P Martin, Robert J Wilkinson
HIV significantly affects the immunological environment during tuberculosis co-infection, and therefore may influence the selective landscape upon which M. tuberculosis evolves. To test this hypothesis whole genome sequences were determined for 169 South African M. tuberculosis strains from HIV-1 co-infected and uninfected individuals and analysed using two Bayesian codon-model based selection analysis approaches: FUBAR which was used to detect persistent positive and negative selection (selection respectively favouring and disfavouring nonsynonymous substitutions); and MEDS which was used to detect episodic directional selection specifically favouring nonsynonymous substitutions within HIV-1 infected individuals...
March 21, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28369307/antimicrobial-resistance-in-mycobacterium-tuberculosis-mechanistic-and-evolutionary-perspectives
#4
Sebastian M Gygli, Sonia Borrell, Andrej Trauner, Sebastien Gagneux
Antibiotic-resistant Mycobacterium tuberculosis strains are threatening progress in containing the global tuberculosis epidemic. Mycobacterium tuberculosis is intrinsically resistant to many antibiotics, limiting the number of compounds available for treatment. This intrinsic resistance is due to a number of mechanisms including a thick, waxy, hydrophobic cell envelope and the presence of drug degrading and modifying enzymes. Resistance to the drugs which are active against M. tuberculosis is, in the absence of horizontally transferred resistance determinants, conferred by chromosomal mutations...
March 25, 2017: FEMS Microbiology Reviews
https://www.readbyqxmd.com/read/28361736/dna-replication-in-mycobacterium-tuberculosis
#5
Zanele Ditse, Meindert H Lamers, Digby F Warner
Faithful replication and maintenance of the genome are essential to the ability of any organism to survive and propagate. For an obligate pathogen such as Mycobacterium tuberculosis that has to complete successive cycles of transmission, infection, and disease in order to retain a foothold in the human population, this requires that genome replication and maintenance must be accomplished under the metabolic, immune, and antibiotic stresses encountered during passage through variable host environments. Comparative genomic analyses have established that chromosomal mutations enable M...
March 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28348941/cutting-the-stone-health-defined-in-the-era-of-value-based-care
#6
REVIEW
Ger Rijkers
The immune system contributes to the maintenance of health by preventing and limiting the clinical consequences of infections by pathogenic microorganisms. During the evolution of Homo sapiens, those with the fittest immune system survived. The immune system of Homo sapiens was further improved and adapted by admixture with Neanderthal genes. Nowadays, the human immune system provides adequate protection against the majority of infections. For some 20 infectious diseases, the immune system needs to be improved by vaccination...
February 10, 2017: Curēus
https://www.readbyqxmd.com/read/28337966/acid-fast-positive-and-acid-fast-negative-mycobacterium-tuberculosis-the-koch-paradox
#7
Catherine Vilchèze, Laurent Kremer
Acid-fast (AF) staining, also known as Ziehl-Neelsen stain microscopic detection, developed over a century ago, is even today the most widely used diagnostic method for tuberculosis. Herein we present a short historical review of the evolution of AF staining methods and discuss Koch's paradox, in which non-AF tubercle bacilli can be detected in tuberculosis patients or in experimentally infected animals. The conversion of Mycobacterium tuberculosis from an actively growing, AF-positive form to a nonreplicating, AF-negative form during the course of infection is now well documented...
March 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28320336/multidrug-resistant-tuberculosis-in-ethiopian-settings-and-its-association-with-previous-history-of-anti-tuberculosis-treatment-a-systematic-review-and-meta-analysis
#8
Setegn Eshetie, Mucheye Gizachew, Mulat Dagnew, Gemechu Kumera, Haile Woldie, Fekadu Ambaw, Belay Tessema, Feleke Moges
BACKGROUND: Efforts to control the global burden of tuberculosis (TB) have been jeopardized by the rapid evolution of multi-drug resistant Mycobacterium tuberculosis (MTB), which is resistant to at least isoniazid and rifampicin. Previous studies have documented variable prevalences of multidrug-resistant tuberculosis (MDR-TB) and its risk factors in Ethiopia. Therefore, this meta-analysis is aimed, firstly, to determine the pooled prevalence of MDR-TB among newly diagnosed and previously treated TB cases, and secondly, to measure the association between MDR-TB and a history of previous anti-TB drugs treatment...
March 20, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28275446/evolution-of-the-health-sector-response-to-hiv-in-myanmar-progress-challenges-and-the-way-forward
#9
EDITORIAL
Htun Nyunt Oo, San Hone, Masami Fujita, Amaya Maw-Naing, Krittayawan Boonto, Marjolein Jacobs, Sabe Phyu, Phavady Bollen, Jacquie Cheung, Htin Aung, May Thu Aung Sang, Aye Myat Soe, Razia Pendse, Eamonn Murphy
Critical building blocks for the response to HIV were made until 2012 despite a series of political, social and financial challenges. A rapid increase of HIV service coverage was observed from 2012 to 2015 through collaborative efforts of government and non-governmental organisations (NGOs). Government facilities, in particular, demonstrated their capacity to expand services for antiretroviral therapy (ART), prevention of mother-to-child transmission (PMTCT) of HIV, tuberculosis and HIV co-infection and methadone-maintenance therapy (MMT)...
November 28, 2016: Journal of Virus Eradication
https://www.readbyqxmd.com/read/28246497/morbidity-by-tuberculosis-in-the-jiu-valley-relation-with-diagnostic-practice-and-the-impact-on-therapeutic-results
#10
Nicolae Petre, Daniela Homorodean, Carmen Monica Pop
BACKGROUND AND AIM: In the last two and a half decades the dynamics of tuberculosis has been modelled by social and economic conditions, with consequences on the life style, and effects on the onset and evolution of the disease. The Jiu Valley is an area with social problems: mining, mines closing down and ceasing activity, poverty. We looked for a relationship between changes of life style in the Jiu Valley and the dynamics of tuberculosis. METHODS: We studied 528 patients who asked for medical services in different hospitals in the Jiu Valley between 2010-2013...
2017: Clujul Medical (1957)
https://www.readbyqxmd.com/read/28162798/-endobronchial-tuberculosis
#11
E Manal, Z Nahid, B Hanane, Y Najiba
BACKGROUND/AIM: The endobronchial tuberculosis (EBTB) is an uncommon type of tuberculosis. The respiratory symptoms in EBTB are usually nonspecific and misleading. The aim of the study is to determine the clinical features and diagnostic aspects of EBTB. PATIENTS AND METHODS: Twenty-eight cases of endobronchial tuberculosis collected from January 2009 to October 2015. RESULTS: EBTB was found in 16 females and 12 males. The mean age was 48 years...
April 2017: Revue de Pneumologie Clinique
https://www.readbyqxmd.com/read/28159234/immunohistochemical-detection-of-pro-inflammatory-and-anti-inflammatory-cytokines-in-granulomas-in-cattle-with-natural-mycobacterium-bovis-infection
#12
Ana M Canal, Natalia Pezzone, Angel Cataldi, Martín Zumarraga, Mariano Larzabal, Sergio Garbaccio, Analía Fernandez, Lucas Dominguez, Alicia Aranaz, Antonio Rodriguez-Bertos
Cellular immune response was evaluated in lymph nodes and lung with different granulomatous lesions from cattle naturally infected with Mycobacterium bovis. For this purpose, we assessed pro-inflammatory and anti-inflammatory cytokines by immunohistochemical assays. Immunoreaction was observed for all the cytokines analyzed. Fourteen animals displayed advanced stage IV granulomas, with intense immunoreactivity to IFN-γ and TGF-β in areas of caseous necrosis, macrophages and lymphocytes. Seven animals showed stage III granuloma, with high immunoreactivity to IFN-γ (average of 44...
February 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28067906/prophage-mediated-defence-against-viral-attack-and-viral-counter-defence
#13
Rebekah M Dedrick, Deborah Jacobs-Sera, Carlos A Guerrero Bustamante, Rebecca A Garlena, Travis N Mavrich, Welkin H Pope, Juan C Cervantes Reyes, Daniel A Russell, Tamarah Adair, Richard Alvey, J Alfred Bonilla, Jerald S Bricker, Bryony R Brown, Deanna Byrnes, Steven G Cresawn, William B Davis, Leon A Dickson, Nicholas P Edgington, Ann M Findley, Urszula Golebiewska, Julianne H Grose, Cory F Hayes, Lee E Hughes, Keith W Hutchison, Sharon Isern, Allison A Johnson, Margaret A Kenna, Karen K Klyczek, Catherine M Mageeney, Scott F Michael, Sally D Molloy, Matthew T Montgomery, James Neitzel, Shallee T Page, Marie C Pizzorno, Marianne K Poxleitner, Claire A Rinehart, Courtney J Robinson, Michael R Rubin, Joseph N Teyim, Edwin Vazquez, Vassie C Ware, Jacqueline Washington, Graham F Hatfull
Temperate phages are common, and prophages are abundant residents of sequenced bacterial genomes. Mycobacteriophages are viruses that infect mycobacterial hosts including Mycobacterium tuberculosis and Mycobacterium smegmatis, encompass substantial genetic diversity and are commonly temperate. Characterization of ten Cluster N temperate mycobacteriophages revealed at least five distinct prophage-expressed viral defence systems that interfere with the infection of lytic and temperate phages that are either closely related (homotypic defence) or unrelated (heterotypic defence) to the prophage...
January 9, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28062754/mycobacterium-tuberculosis-complex-exhibits-lineage-specific-variations-affecting-protein-ductility-and-epitope-recognition
#14
Inmaculada Yruela, Bruno Contreras-Moreira, Carlos Magalhães, Nuno S Osório, Jesús Gonzalo-Asensio
The advent of whole-genome sequencing has provided an unprecedented detail about the evolution and genetic significance of species-specific variations across the whole Mycobacterium tuberculosis Complex. However, little attention has been focused on understanding the functional roles of these variations in the protein coding sequences. In this work, we compare the coding sequences from 74 sequenced mycobacterial species including M. africanum, M. bovis, M. canettii, M. caprae, M. orygis, and M. tuberculosis...
December 1, 2016: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28053915/frequency-of-mutations-in-rifampicin-and-isoniazid-resistant-isolates-of-m-tuberculosis-an-analysis-from-central-india
#15
Prabha Desikan, Atul Kharate, Nikita Panwalkar, Jyoti Khurana, Shaina Beg Mirza, Aparna Chaturvedi, Reeta Varathe, Manju Chourey, Pradeep Kumar, Nitin Doshi, Manoj Pandey
BACKGROUND: The spread of drug-resistant tuberculosis has challenged tuberculosis control strategies globally. The present study aims to analyze the frequency of mutations in rpoB, katG and inhA genes in strains of M. tuberculosis complex (MTBC) circulating in Central India. It is anticipated that the findings may provide a starting point to understand the evolutionary success of drug-resistant strains of MTBC in this region. METHODS: Line probe assay was carried out on 720 consecutive sputum samples of MDR suspects from June 2012 to May 2013...
December 2016: Germs
https://www.readbyqxmd.com/read/28043788/comparison-of-bacteriological-conversion-and-treatment-outcomes-among-mdr-tb-patients-with-and-without-diabetes-in-mexico-preliminary-data
#16
M Muñoz-Torrico, J Caminero Luna, G B Migliori, L D'Ambrosio, J L Carrillo-Alduenda, H Villareal-Velarde, A Torres-Cruz, H Flores-Ergara, D Martínez-Mendoza, C García-Sancho, R Centis, M Á Salazar-Lezama, R Pérez-Padilla
Diabetes mellitus (DM) is a well-known risk factor for tuberculosis (TB). However, it is not known to what extent DM affects the outcome in patients with multidrug-resistant (MDR-TB) and extensively drug-resistant TB (XDR-TB) treated with second-line anti-TB drugs. The objective of this study was to compare the microbiological evolution (sputum smear and culture conversion) and final outcomes of MDR/XDR-TB patients with and without DM, managed at the national TB reference centre in Mexico City. RESULTS: Ninety patients were enrolled between 2010 and 2015: 73 with MDR-TB (81...
December 30, 2016: Revista Portuguesa de Pneumologia
https://www.readbyqxmd.com/read/28043592/next-generation-sequencing-based-user-friendly-platforms-for-drug-resistant-tuberculosis-diagnosis-a-promise-for-the-near-future
#17
David L Dolinger, Rebecca E Colman, David M Engelthaler, Timothy C Rodwell
Since 2002, there has been a gradual worldwide 1.3% annual decrease in the incidence of tuberculosis (TB). This is an encouraging statistic; however, it will not achieve the World Health Organization's goal of eliminating TB by 2050, and it is being compounded by the persistent global incidence of drug-resistant tuberculosis (DR-TB) acquired by transmission and by treatment pressure. One key to effectively control tuberculosis and the spread of multiresistant strains is accurate information pertaining to drug resistance and susceptibility...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043547/restriction-fragment-length-polymorphism-pattern-of-mycobacterium-isolates-from-rodents-in-infected-cattle-farms
#18
Khatereh Alizadeh, Nader Mosavari, Razieh Nazari
OBJECTIVE/BACKGROUND: Mycobacterium tuberculosis, the etiologic agent of tuberculosis, causes large-scale morbidity and mortality, particularly in developing countries. In recent years, there has been a significant increase in the drug-resistant ability of M. tuberculosis, triggering a major public health crisis. A detailed analysis of the evolution of the mycobacterial genome helps to better understand the genotype-phenotype relationship in this bacterium. Different strain typing methods have already revealed the worldwide diversity of mycobacterial isolates...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043520/molecular-characterization-of-mycobacterium-tuberculosis-strains-resistant-to-isoniazid
#19
Salma Smaoui, Mariem Siala, Sondes Hadj Fredj, Sana Kammoun, Chema Marouane, Salma Hachicha, Asma Ghorbel, Radhouane Gdoura, Leila Slim, Taieb Ben Messaoud, Férièle Messadi
OBJECTIVE/BACKGROUND: Tuberculosis is a major public health problem and the emergence of drug resistance complicates the situation even more. It is therefore crucial to implement all conclusions from the studies that aim at a better understanding of the molecular mechanisms which govern the emergence and the evolution of drug resistance. The aim of this study is to assess the degree of involvement of the inhA and katG genes in the acquisition of isoniazid resistance in clinical strains of Mycobacterium tuberculosis...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043498/multidrug-resistant-tuberculosis-in-ethiopian-settings-and-its-association-with-previous-antituberculosis-treatment-a-systematic-review-and-meta-analysis
#20
Setegn Eshetie, Feleke Moges, Mulat Dagnew
OBJECTIVES/BACKGROUND: Efforts to control the global burden of tuberculosis (TB) epidemic have now been jeopardized by the rapid evolution of drug-resistant Mycobacterium tuberculosis (MTB), which are resistant to one or more anti-TB drugs. Multidrug resistant (MDR) TB in Ethiopia may be more prevalent than previously appreciated; thus, up-to-date national drug resistance studies are critically needed. Therefore, this meta-analysis aimed, first, to determine pooled prevalence of MDR TB among newly diagnosed and previously treated TB cases, and second, to measure the association between previous anti-TB exposure and acquisition of MDR-MTB infection...
December 2016: International Journal of Mycobacteriology
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