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rpoB mutation

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https://www.readbyqxmd.com/read/28399968/tuberculosis-resistance-conferring-mutations-with-fitness-cost-among-hiv-positive-individuals-in-uganda
#1
W Ssengooba, D Lukoye, C J Meehan, D P Kateete, M L Joloba, B C de Jong, F G Cobelens, F van Leth
BACKGROUND: Multidrug-resistant tuberculosis (MDR-TB) is considered to be less transmissible due to the fitness cost associated with drug resistance-conferring mutations in essential genes. OBJECTIVE: To test the hypothesis that TB drug resistance-conferring mutations with fitness cost are more frequent among human immunodeficiency virus (HIV) positive than among HIV-negative patients. DESIGN: We analysed all strains from the two TB drug resistance surveys conducted in Uganda between 2008 and 2011...
May 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28343421/in-vitro-and-in-vivo-fitness-costs-associated-with-mycobacterium-tuberculosis-rpob-mutation-h526d
#2
Dalin Rifat, Victoria L Campodónico, Jing Tao, James A Miller, Alpaslan Alp, Yufeng Yao, Petros C Karakousis
AIM: There is controversy regarding the potential fitness costs of rifampicin (RIF) resistance-conferring mutations in the Mycobacterium tuberculosis (Mtb) rpoB gene. We characterized the pathogenicity of an Mtb RpoB H526D mutant. MATERIALS & METHODS: A mutant containing the RpoB H526D mutation was isolated from wild-type Mtb grown on RIF-containing plates and complemented for determination of in vitro and in vivo fitness costs. RESULTS: The RpoB H526D mutant showed reduced survival relative to control strains during progressive hypoxia and delayed growth following resuscitation from nutrient starvation (p < 0...
March 27, 2017: Future Microbiology
https://www.readbyqxmd.com/read/28331348/molecular-detection-of-multidrug-resistant-tuberculosis-among-smear-positive-pulmonary-tuberculosis-patients-in-jigjiga-town-ethiopia
#3
Mussie Brhane, Ameha Kebede, Yohannes Petros
BACKGROUND: Molecular methods that target drug resistance mutations are suitable approaches for rapid drug susceptibility testing to detect multidrug-resistant tuberculosis (MDR-TB). The aim of the study was to determine MDR-TB cases and to analyze the frequency of gene mutations associated with rifampicin (RIF) and/or isoniazid (INH) resistance of Mycobacterium tuberculosis among smear-positive pulmonary tuberculosis patients. METHODS: Institution-based cross-sectional study design was employed...
2017: Infection and Drug Resistance
https://www.readbyqxmd.com/read/28330890/direct-detection-of-rifampicin-and-isoniazid-resistance-in-sputum-samples-from-tuberculosis-patients-by-high-resolution-melt-curve-analysis
#4
Divya Anthwal, Rakesh Kumar Gupta, Manpreet Bhalla, Shinjini Bhatnagar, Jaya Sivaswami Tyagi, Sagarika Haldar
Drug-resistant tuberculosis (TB) is a major threat for TB control worldwide. Globally, only 40% of the 340,000 notified TB patients estimated to have multidrug resistant-TB (MDR-TB) were detected in 2015. This study was carried out to evaluate the utility of High Resolution Melt curve analysis (HRM) for the rapid and direct detection of MDR-TB in Mycobacterium tuberculosis (M. tb) in sputum samples. A reference plasmid library was first generated of the most frequently observed mutations in the resistance determining regions of rpoB, katG and inhA promoter and used as positive controls in HRM...
March 22, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28317805/prevalence-and-genetic-determinant-of-drug-resistant-tuberculosis-among-patients-completing-intensive-phase-of-treatment-in-a-tertiary-referral-center-in-nigeria
#5
Aminu Bashir Mohammad, Garba Iliyasu, Abdulrazaq Garba Habib
BACKGROUND: Drug-resistant tuberculosis (DR-TB) continues to be a challenge in developing countries with poor resources. Despite the high prevalence of primary DR-TB, its routine screening prior to the treatment is not performed in public hospitals in Nigeria. Data regarding drug resistance and its genetic determinant among follow-up patients with TB are lacking in Nigeria. Hence, the aim of this study was to determine the prevalence and genetic determinant of drug resistance among the follow-up patients with TB in a tertiary hospital in Nigeria...
January 2017: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28284608/characterization-of-pig-associated-methicillin-resistant-staphylococcus-aureus
#6
Jun Li, Nansong Jiang, Yuebin Ke, Andrea T Feßler, Yang Wang, Stefan Schwarz, Congming Wu
Livestock-associated methicillin-resistant Staphylococcus aureus (LA-MRSA) have been reported in various countries worldwide. However, although China is one of the biggest pig and pork producers, large-scale studies on pig-associated LA-MRSA from China are scarce. The aims of this study were to analyze 2420 non-duplicate samples collected from pigs at swine farms and slaughterhouses in different regions in China during 2014 for the prevalence of pig-associated MRSA and to determine the antimicrobial resistance pheno- and genotypes of the respective isolates...
March 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28277228/utility-of-phenotypic-and-genotypic-testing-in-the-study-of-mycobacterium-tuberculosis-resistance-to-first-line-anti-tuberculosis-drugs
#7
Luz María Alba Álvarez, José María García García, M Dolores Pérez Hernández, Susana Martínez González, Juan José Palacios Gutiérrez
OBJECTIVE: To determine the utility of molecular techniques in the diagnosis of resistance and the extent of resistance to first-line drugs in our region. MATERIAL AND METHOD: From 2004 to 2013, 1,889 strains of Mycobacterium tuberculosis complex isolated in Asturias, Spain, were studied using phenotypic (Clinical and Laboratory Standards Institute guidelines) and molecular (INNOLiPA RIF-TB(©); GenotypeMDRplus(©); GenotypeMDRsl(©)) sensitivity tests. RESULTS: 1,759 strains (94...
October 27, 2016: Archivos de Bronconeumología
https://www.readbyqxmd.com/read/28245964/molecular-modelling-and-docking-analysis-of-katg-and-rpob-gene-in-mdr-tb-isolates-from-north-central-indian-population
#8
Ravi Prakash, Rahul Gupta, Vishwa M Katoch, Pramod K Tiwari
Tuberculosis caused by Mycobacterium tuberculosis, requires multi drug therapy approach. Drug resistance in M. tuberculosis is caused by mutations in specific regions in drug target genes. The study aimed to identify mutations in katG and rpoB genes and investigate the drug-drug target interactions. A total of 27 MDR-TB isolates were sequenced for katG and rpoB genes and docking and MIC analysis were performed. Three types of mutations for katG gene (Arg463Leu in all isolates of Sahariya and non-tribes; Asp529Thr and Asp529His, each in two isolates only, in Sahariya) were observed...
February 25, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28243227/rifampicin-resistance-mutations-in-the-rpob-gene-in-bacillus-velezensis-cc09-have-pleiotropic-effects
#9
Xun-Chao Cai, Huan Xi, Li Liang, Jia-Dong Liu, Chang-Hong Liu, Ya-Rong Xue, Xiang-Yang Yu
Rifampicin resistance (Rif(r)) mutations in the RNA polymerase β subunit (rpoB) gene exhibit pleiotropic phenotypes as a result of their effects on the transcription machinery in prokaryotes. However, the differences in the effects of the mutations on the physiology and metabolism of the bacteria remain unknown. In this study, we isolated seven Rif(r) mutations in rpoB, including six single point mutations (H485Y, H485C, H485D, H485R, Q472R, and S490L) and one double point mutation (S490L/S617F) from vegetative cells of an endophytic strain, Bacillus velezensis CC09...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28225540/antituberculosis-drug-resistance-in-pulmonary-isolates-of-mycobacterium-tuberculosis-cuba-2012-2014
#10
Dihadenys Lemus, Miguel Echemendía, Raúl Díaz, María J Llanes, Lourdes Suárez, Antonio Marrero
INTRODUCTION Systematic surveillance of antituberculosis drug resistance allows identification of multidrug-resistant and extensively drug-resistant isolates of Mycobacterium tuberculosis. Surveillance studies of antituberculosis drug resistance systematically conducted in Cuba for over 15 years have revealed low circulation of multidrug-resistant tuberculosis, under 1% in new cases. OBJECTIVE Characterize antituberculosis drug resistance in isolates of M. tuberculosis recovered from patients with pulmonary tuberculosis in Cuba in 2012-2014...
January 2017: MEDICC Review
https://www.readbyqxmd.com/read/28220707/first-description-of-a-rifampicin-resistant-neisseria-meningitidis-serogroup-y-strain-causing-recurrent-invasive-meningococcal-disease-in-hungary
#11
Ákos Tóth, Brigitta Berta, Tamás Tirczka, Csilla Jekkel, Anita Ábrahám, Zoltán Prohászka, Zsófia Bognár, Tímea Erdősi
A Hungarian soldier previously immunized against Neisseria meningitidis by quadrivalent polysaccharide vaccine was twice infected with meningococci within six weeks. The patient was treated with ceftriaxone during both episodes and he successfully recovered. His close contacts received rifampicin prophylaxis. An investigation was performed to characterize the genetic background of the pathogens to ascertain if the recurrent invasive meningococcal disease was caused by the same strain and to find out the reason for reinfection...
February 21, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28216019/draft-genome-sequence-of-reduced-teicoplanin-susceptible-and-vancomycin-heteroresistant-methicillin-resistant-staphylococcus-aureus-from-sepsis-cases
#12
Yamuna Devi Bakthavatchalam, Balaji Veeraraghavan, Naveen Kumar Devanga Ragupathi, Priyanka Babu, Elakkiya Munuswamy, Thambu David
Here we report the whole-genome shotgun sequence of six methicillin-resistant Staphylococcus aureus (MRSA) showing reduced susceptibility to both vancomycin and teicoplanin. The typical Indian community-acquired MRSA (CA-MRSA) clone ST772-MRSA-V-t657 was the most common genotype (3/6; 50%), followed by ST672-MRSA-IV (2/6; 33%) and ST22-MRSA-IV (1/6; 17%). All strains harboured a mutation in the tcaRAB operon, vraSR, graSR and/or rpoB genes, which are frequently mutated determinants in a heteroresistant vancomycin-intermediate S...
March 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28197340/phenotypic-and-genotypic-analysis-of-multidrug-resistant-mycobacterium-tuberculosis-isolates-from-sudanese-patients
#13
Solima M A Sabeel, Mohamed Ahmed Salih, Manasik Ali, Salah-Eldin El-Zaki, Nadir Abuzeid, Zeinab Abubaker Mohammed Elgadi, Hisham N Altayb, Asrar M A Elegail, Nuha Y Ibrahim, Bahaeldin K Elamin
Background. Currently, mutations in rpoB, KatG, and rrs genes and inhA promoter were considered to be involved in conferring resistance to rifampicin, isoniazid, and streptomycin in Mycobacterium tuberculosis (MTB). Objective. The aims of this study were to detect the prevalence of first-line tuberculosis (TB) drug resistance among a group of previously treated and newly detected TB patients, to determine the association between prevalence of multidrug resistance (MDR) and demographic information (age and sex), to explain genes correlated with MDR Mycobacterium tuberculosis, and to characterize MTB via 16S ribosomal RNA (16S rRNA) analysis...
2017: Tuberculosis Research and Treatment
https://www.readbyqxmd.com/read/28193207/a-novel-point-mutation-in-rpob-improves-osmotolerance-and-succinic-acid-production-in-escherichia-coli
#14
Mengyong Xiao, Xinna Zhu, Hongtao Xu, Jinlei Tang, Ru Liu, Changhao Bi, Feiyu Fan, Xueli Zhang
BACKGROUND: Escherichia coli suffer from osmotic stress during succinic acid (SA) production, which reduces the performance of this microbial factory. RESULTS: Here, we report that a point mutation leading to a single amino acid change (D654Y) within the β-subunit of DNA-dependent RNA polymerase (RpoB) significantly improved the osmotolerance of E. coli. Importation of the D654Y mutation of RpoB into the parental strain, Suc-T110, increased cell growth and SA production by more than 40% compared to that of the control under high glucose osmolality...
February 13, 2017: BMC Biotechnology
https://www.readbyqxmd.com/read/28167522/decreased-expression-of-stable-rna-can-alleviate-the-lethality-associated-with-rnase-e-deficiency-in-escherichia-coli
#15
P Himabindu, K Anupama
The endoribonuclease RNase E participates in mRNA degradation, rRNA processing, and tRNA maturation in Escherichia coli, but the precise reasons for its essentiality are unclear and much debated. The enzyme is most active on RNA substrates with a 5'-terminal monophosphate, which is sensed by a domain in the enzyme that includes residue R169; E. coli also possesses a 5'-pyrophosphohydrolase, RppH, that catalyzes conversion of 5'-terminal triphosphate to 5'-terminal monophosphate on RNAs. Although the C-terminal half (CTH), beyond residue approximately 500, of RNase E is dispensable for viability, deletion of the CTH is lethal when combined with an R169Q mutation or with deletion of rppH In this work, we show that both these lethalities can be rescued in derivatives in which four or five of the seven rrn operons in the genome have been deleted...
April 15, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28163698/bacillus-amyloliquefaciens-bacillus-velezensis-and-bacillus-siamensis-form-an-operational-group-b-amyloliquefaciens-within-the-b-subtilis-species-complex
#16
Ben Fan, Jochen Blom, Hans-Peter Klenk, Rainer Borriss
The plant growth promoting model bacterium FZB42(T) was proposed as the type strain of Bacillus amyloliquefaciens subsp. plantarum (Borriss et al., 2011), but has been recently recognized as being synonymous to Bacillus velezensis due to phylogenomic analysis (Dunlap C. et al., 2016). However, until now, majority of publications consider plant-associated close relatives of FZB42 still as "B. amyloliquefaciens." Here, we reinvestigated the taxonomic status of FZB42 and related strains in its context to the free-living soil bacterium DSM7(T), the type strain of B...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28137804/a-clostridium-difficile-lineage-endemic-to-costa-rican-hospitals-is-multidrug-resistant-by-acquisition-of-chromosomal-mutations-and-novel-mobile-genetic-elements
#17
Gabriel Ramírez-Vargas, Carlos Quesada-Gómez, Luis Acuña-Amador, Diana López-Ureña, Tatiana Murillo, María Del Mar Gamboa-Coronado, Esteban Chaves-Olarte, Nicholas Thomson, Evelyn Rodríguez-Cavallini, César Rodríguez
The antimicrobial resistance (AMR) rates and levels recorded for Clostridium difficile are on the rise. This study reports the nature, levels, diversity, and genomic context of the antimicrobial resistance of human C. difficile isolates of the NAPCR1/RT012/ST54 genotype, which caused an outbreak in 2009 and is endemic in Costa Rican hospitals. To this end, we determined the susceptibilities of 38 NAPCR1 isolates to 10 antibiotics from seven classes using Etests or macrodilution tests and examined 31 NAPCR1 whole-genome sequences to identify single nucleotide polymorphisms (SNPs) and genes that could explain the resistance phenotypes observed...
April 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28100602/find-tuberculosis-strain-bank-a-resource-for-researchers-and-developers-working-on-tests-to-detect-mycobacterium-tuberculosis-and-related-drug-resistance
#18
Belay Tessema, Pamela Nabeta, Eloise Valli, Audrey Albertini, Jimena Collantes, Nguyen Huu Lan, Elena Romancenco, Nestani Tukavdze, Claudia M Denkinger, David L Dolinger
The spread of multidrug-resistant (MDR) tuberculosis (TB) and extensively drug-resistant (XDR) TB hampers global efforts in the fight against tuberculosis. To enhance the development and evaluation of diagnostic tests quickly and efficiently, well-characterized strains and samples from drug-resistant tuberculosis patients are necessary. In this project, the Foundation for Innovative New Diagnostics (FIND) has focused on the collection, characterization, and storage of such well-characterized reference materials and making them available to researchers and developers...
April 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28081169/assessment-of-a-96-well-plate-assay-of-quantitative-drug-susceptibility-testing-for-mycobacterium-tuberculosis-complex-in-china
#19
Hui Xia, Yang Zheng, Bing Zhao, Susan van den Hof, Frank Cobelens, YanLin Zhao
OBJECTIVE: To evaluate the performance of the Sensitire MYCOTB MIC Plate (MYCOTB) which could measure the twelve anti-tuberculosis drugs susceptibility on one 96-wells plate. METHODS: A total of 140 MDR-TB strains and 60 non-MDR strains were sub-cultured and 193 strains were finally tested for drug resistance using MYCOTB and agar proportion method (APM) and another 7 strains failed of subculture. The drugs included ofloxacin (Ofx), moxifloxacin (Mfx), rifampin (RFP), amikacin (Am), rifabutin (Rfb), para-aminosalicylic acid (PAS), ethionamide (Eth), isoniazid (INH), kanamycin (Km), ethambutol (EMB), streptomycin (Sm), and cycloserine(Cs)...
2017: PloS One
https://www.readbyqxmd.com/read/28053915/frequency-of-mutations-in-rifampicin-and-isoniazid-resistant-isolates-of-m-tuberculosis-an-analysis-from-central-india
#20
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
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