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Evolution and tuberculosis

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https://www.readbyqxmd.com/read/28540155/low-levels-of-extensively-drug-resistant-tuberculosis-among-multidrug-resistant-tuberculosis-isolates-and-their-relationship-to-risk-factors-surveillance-in-tehran-iran-2006-to-2014
#1
Alireza Hadizadeh Tasbiti, Shamsi Yari, Mostafa Ghanei, Mohammad Ali Shokrgozar, Abolfazl Fateh, Ahmadreza Bahrmand
OBJECTIVES: Extensively drug-resistant tuberculosis (XDR-TB) is more expensive and difficult to treat than multidrug-resistant tuberculosis (MDR-TB), and outcomes for patients are much worse; therefore, it is important that clinicians understand the magnitude and distribution of XDR-TB. We conducted a retrospective study to compare the estimated incidence of and risk factors for M/XDR-TB with those of susceptible TB controls. METHODS: Sputum culture and drug susceptibility testing (DST) were performed in patients with known or suspected TB...
April 2017: Osong Public Health and Research Perspectives
https://www.readbyqxmd.com/read/28533875/-management-of-spontaneous-pneumothorax-about-138-cases
#2
Bouchra Habibi, Leila Achachi, Sohaib Hayoun, Mohammed Raoufi, Laila Herrak, Mustapha El Ftouh
Pneumothorax is a collection of air in the pleural cavity. We conducted a retrospective study of patients with spontaneous pneumothorax in the Department of Pneumology at the Ibn Sina Hospital in Rabat (2009-2011) with the aim to determine the epidemiological, clinical, radiological, therapeutic and evolutionary manifestation of spontaneous pneumothorax. The study involved 138 patients: 128 men and 10 women (17-83 years), with an average age of 44.5 +/- 17.4 years and sex ratio of 12/8. 81.2% of patients were smokers...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/28512703/metal-homeostasis-in-bacteria-the-role-of-arsr-smtb-family-of-transcriptional-repressors-in-combating-varying-metal-concentrations-in-the-environment
#3
REVIEW
Rudra P Saha, Saikat Samanta, Surajit Patra, Diganta Sarkar, Abinit Saha, Manoj Kumar Singh
Bacterial infections cause severe medical problems worldwide, resulting in considerable death and loss of capital. With the ever-increasing rise of antibiotic-resistant bacteria and the lack of development of new antibiotics, research on metal-based antimicrobial therapy has now gained pace. Metal ions are essential for survival, but can be highly toxic to organisms if their concentrations are not strictly controlled. Through evolution, bacteria have acquired complex metal-management systems that allow them to acquire metals that they need for survival in different challenging environments while evading metal toxicity...
May 16, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28498943/mycobacterium-tuberculosis-whole-genome-sequences-from-southern-india-suggest-novel-resistance-mechanisms-and-the-need-for-region-specific-diagnostics
#4
Abigail L Manson, Thomas Abeel, James E Galagan, Jagadish Chandrabose Sundaramurthi, Alex Salazar, Thies Gehrmann, Siva Kumar Shanmugam, Kannan Palaniyandi, Sujatha Narayanan, Soumya Swaminathan, Ashlee M Earl
Background.: India is home to 25% of all tuberculosis cases and the second highest number of multidrug resistant cases worldwide. However, little is known about the genetic diversity and resistance determinants of Indian Mycobacterium tuberculosis, particularly for the primary lineages found in India, lineages 1 and 3. Methods.: We whole genome sequenced 223 randomly selected M. tuberculosis strains from 196 patients within the Tiruvallur and Madurai districts of Tamil Nadu in Southern India...
June 1, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28485504/mechanistic-principles-behind-molecular-mechanism-of-rifampicin-resistance-in-mutant-rna-polymerase-beta-subunit-of-mycobacterium-tuberculosis
#5
Aditi Singh, Sonam Grover, Sidhartha Sinha, Mriganko Das, Pallavi Somvanshi, Abhinav Grover
Evolution of drug resistant Mycobacterium strains threatens the TB treatment and control programs globally. Rifampicin (RIF) is an important first line antitubercular drug. Resistance to Rifampicin is caused mainly by mutations in its target RNA polymerase beta subunit protein (RpoB). RpoB contains a Rifampicin resistance determining region (RRDR) and has several potent sites for mutations. In this study, we have investigated mutations of a single site (H451) to eight different amino acids, involved in RIF resistance...
May 9, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28480833/nanoemulsion-for-the-effective-treatment-and-management-of-anti-tubercular-drug-therapy
#6
Sarwar Beg, Sumant Saini, Sarim Imam, Mahfoozur Rahman, Suryakanta Swain, M S Hasnain
BACKGROUND: Tuberculosis is considered as one of the deadliest diseases of human existence. Since ancient age the treatment of tuberculosis has been highly challenging primarily owing to the pathogenic nature of the Mycobacterium and its diverse spots of localization in human body including lungs, liver, spleen, eye, meninges and lymph nodes. METHODS: The conventional drug therapy employed for the treatment of tuberculosis is not highly satisfactorily owing to low oral bioavailability of the drugs...
May 3, 2017: Recent Patents on Anti-infective Drug Discovery
https://www.readbyqxmd.com/read/28476627/-the-impact-of-mycobacterium-tuberculosis-immune-evasion-on-protective-immunity-implications-for-tb-vaccine-design-meeting-report
#7
Cesar Boggiano, Katrin Eichelberg, Lakshmi Ramachandra, Jaqueline Shea, Lalita Ramakrishnan, Samuel Behar, Joel D Ernst, Steven A Porcelli, Markus Maeurer, Hardy Kornfeld
Tuberculosis (TB) is the major cause of death from infectious diseases around the world, particularly in HIV infected individuals. TB vaccine design and development have been focused on improving Bacille Calmette-Guérin (BCG) and evaluating recombinant and viral vector expressed Mycobacterium tuberculosis (Mtb) proteins, for boosting BCG-primed immunity, but these approaches have not yet yielded significant improvements over the modest effects of BCG in protecting against infection or disease. On March 7-8, 2016, the National Institute of Allergy and Infectious Diseases (NIAID) convened a workshop on "The Impact of Mtb Immune Evasion on Protective Immunity: Implications for TB Vaccine Design" with the goal of defining immune mechanisms that could be targeted through novel research approaches, to inform vaccine design and immune therapeutic interventions for prevention of TB...
May 2, 2017: Vaccine
https://www.readbyqxmd.com/read/28465507/the-role-of-hydrophobicity-in-tuberculosis-evolution-and-pathogenicity
#8
Monika Jankute, Vijayashankar Nataraj, Oona Y-C Lee, Houdini H T Wu, Malin Ridell, Natalie J Garton, Michael R Barer, David E Minnikin, Apoorva Bhatt, Gurdyal S Besra
The evolution of tubercle bacilli parallels a route from environmental Mycobacterium kansasii, through intermediate "Mycobacterium canettii", to the modern Mycobacterium tuberculosis complex. Cell envelope outer membrane lipids change systematically from hydrophilic lipooligosaccharides and phenolic glycolipids to hydrophobic phthiocerol dimycocerosates, di- and pentaacyl trehaloses and sulfoglycolipids. Such lipid changes point to a hydrophobic phenotype for M. tuberculosis sensu stricto. Using Congo Red staining and hexadecane-aqueous buffer partitioning, the hydrophobicity of rough morphology M...
May 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28454652/selection-characterization-and-application-of-dna-aptamers-for-detection-of-mycobacterium-tuberculosis-secreted-protein-mpt64
#9
Marzhan Sypabekova, Aliya Bekmurzayeva, Ronghui Wang, Yanbin Li, Claude Nogues, Damira Kanayeva
Rapid detection of Mycobacterium tuberculosis (Mtb), an etiological agent of tuberculosis (TB), is important for global control of this disease. Aptamers have emerged as a potential rival for antibodies in therapeutics, diagnostics and biosensing due to their inherent characteristics. The aim of the current study was to select and characterize single-stranded DNA aptamers against MPT64 protein, one of the predominant secreted proteins of Mtb pathogen. Aptamers specific to MPT64 protein were selected in vitro using systematic evolution of ligands through exponential enrichment (SELEX) method...
May 2017: Tuberculosis
https://www.readbyqxmd.com/read/28453022/-evolution-of-epidemiological-and-clinical-characteristics-of-adults-patients-belonging-to-the-national-program-at-start-of-antiretroviral-therapy-in-the-chilean-aids-cohort-2001-2015
#10
Carlos Beltrán, Pedro Zitko, Marcelo Wolff, Fernando Bernal, Alicia Asenjo, Ana M Fernández, Ana Miles, Elizabeth Barthel, Gonzalo Wilson
BACKGROUND: Chilean AIDS Cohort is the oldest and extensive in Latin America and one of most numerous and with longer follow up time to international level. Records information from 14,873 patients out of approximately 22,000 in antiretroviral therapy in the public system and its results have allowed to know the national reality and have contributed to the adoption of public policies. AIM: To describe the demographic, clinical and immunological characteristics of patients who have started ART in Chile and its evolution over the past 15 years...
October 2016: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
https://www.readbyqxmd.com/read/28391322/evolutionary-thrift-mycobacteria-repurpose-plasmid-diversity-during-adaptation-of-type-vii-secretion-systems
#11
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
#12
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
#13
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
#14
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...
May 1, 2017: FEMS Microbiology Reviews
https://www.readbyqxmd.com/read/28361736/dna-replication-in-mycobacterium-tuberculosis
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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)
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