keyword
MENU ▼
Read by QxMD icon Read
search

rpoB mutation

keyword
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
#1
Belay Tessema, Pamela Nabeta, Eloise Valli, Audrey Albertini, Jimena Collantes, Nguyen Huu Lan, Elena Romancenco, Nestani Tukavdze, Claudia M Denkinger, David L Dolinger
BACKGROUND: The spread of multidrug-resistant tuberculosis and extensively drug-resistant TB hampers the 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, FIND has focused on the collection, characterization and storage of such well-characterized reference materials and to make them available to researchers and developers...
January 18, 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
#2
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
#3
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/28043516/evaluation-of-genotype-mtbdrplus-assay-for-rapid-detection-of-isoniazid-and-rifampicin-resistance-in-mycobacterium-tuberculosis-clinical-isolates-from-pakistan
#4
Hasnain Javed, Nazia Jamil, Tomasz Jagielski, Zofia Bakuła, Zarfishan Tahir
BACKGROUND: GenoType MTBDRplus is a molecular assay for detection of Mycobacterium tuberculosis resistance to isoniazid (INH) and rifampicin (RMP), the two major anti-tuberculosis (TB) drugs. Identification of INH resistance is largely based on the occurrence of mutations in the katG gene, coding for the catalase-peroxidase, or in the promoter region of the inhA gene, coding for the NADH-dependent enoyl-ACP reductase. For testing the RMP resistance, mutations in the rpoB gene, coding for the RNA polymerase β subunit, particularly in the RMP resistance determining region (RRDR) of the gene are investigated...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043515/evaluation-of-rifampicin-resistance-and-81-bp-rifampicin-resistant-determinant-region-of-rpob-gene-mutations-of-mycobacterium-tuberculosis-detected-with-xpertmtb-rif-in-cross-river-state-nigeria
#5
Ernest A Ochang, Ubong A Udoh, Ubleni E Emanghe, Gerald O Tiku, Jonah B Offor, Micheal Odo, Emmanuel Nkombe, Oju E Owuna, Sunday M Obeten, Martin M Meremikwu
OBJECTIVE/BACKGROUND: World Health Organization tuberculosis (TB) indices from 2014 to 2016 showed that Nigeria had the 6th highest prevalence, 4th highest incidence, and the highest mortality rate globally. In efforts to improve TB care, the XpertMTB/Rif (GeneXpert) technology, Cepheid, Sunnyvale, California, USA, which has revolutionized TB detection with concomitant rifampicin-resistance molecular detection, was introduced in Cross River State, South-South Nigeria, in 2014. The GeneXpert uses molecular beacons to detect five overlapping 81-bp regions in the rpoB gene known as the Rifampicin Resistant Determinant Region (RRDR)...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043502/genotypic-analysis-of-multidrug-resistant-tuberculosis-isolates-from-extra-pulmonary-tuberculosis-cases-in-tertiary-care-centers-in-northern-india
#6
Anand K Maurya, Vijaya L Nag, Surya Kant, Ramawadh S Kushwaha, Tapan N Dhole
OBJECTIVE/BACKGROUND: Multidrug-resistant tuberculosis (MDR-TB) is a major public health problem. The diagnosis of MDR-TB is of paramount importance in establishing appropriate clinical management and infection control measures. Rapid detection of MDR-TB allows the establishment of an effective treatment regimen, minimizes the risk of further resistance, and limits the spread of drug-resistant strains. The aim of this study is to determine the genotypic characterization of MDR-TB isolates from extra pulmonary tuberculosis (EPTB) cases in tertiary care centers in Northern India...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043501/comparative-proteomic-analysis-of-sequential-isolates-of-mycobacterium-tuberculosis-sensitive-and-resistant-beijing-type-from-a-patient-with-pulmonary-tuberculosis
#7
Amit Singh, Anil Kumar Gupta, Krishnamoorthy Gopinath, Divakar Sharma, Prashant Sharma, Deepa Bisht, Pawan Sharma, Sarman Singh
AIM & OBJECTIVE: In India, tuberculosis (TB) is a foremost health problem, and the emergence of multidrug-resistant (MDR) and extensively drug resistant (XDR) strains of Mycobacterium tuberculosis (M. tuberculosis) has further complicated the situation. Although various mechanisms have been proposed to elucidate the emergence of resistance, our knowledge remains insufficient. The formation of a very complex network and drugs of proteins are countered by their efflux/modification or target over-expression/modification...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28009073/structural-basis-for-rifamycin-resistance-of-bacterial-rna-polymerase-by-the-three-most-clinically-important-rpob-mutations-found-in-mycobacterium-tuberculosis
#8
Vadim Molodtsov, Nathan T Scharf, Maxwell A Stefan, George A Garcia, Katsuhiko S Murakami
Since 1967, Rifamaycin (RIF) has been used as a first line antibiotic treatment for tuberculosis (TB), and it remains the cornerstone of current short-term TB treatment. Increased occurrence of RIF-resistant (RIF(R) ) TB, ∼41% of which results from the RpoB S531L mutation in RNA polymerase (RNAP), has become a growing problem worldwide. In this study, we determined the X-ray crystal structures of the Escherichia coli RNAPs containing the most clinically important S531L mutation and two other frequently observed RIF(R) mutants, RpoB D516V and RpoB H526Y...
December 23, 2016: Molecular Microbiology
https://www.readbyqxmd.com/read/28005521/characterisation-of-nasal-methicillin-resistant-staphylococcus-aureus-isolated-from-international-human-and-veterinary-surgeons
#9
Virginia Post, Llinos Harris, Mario Morgenstern, R Geoff Richards, Samuel K Sheppard, Fintan Moriarty
Nasal colonization with methicillin-resistant Staphylococcus aureus is poorly described for surgeons, despite the increased exposure to nosocomial pathogens and at-risk patients. This study investigated the molecular epidemiology and antimicrobial resistance of 26 MRSA isolates cultured from the nares of an international cross-sectional study of 1,166 human and 60 veterinary surgeons. All isolates were subjected to agr-, spa- and MLST typing and the presence of 22 virulence factors were screened for by PCR...
December 21, 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27999059/walk-s221p-a-naturally-occurring-mutation-confers-vancomycin-resistance-in-visa-strain-xn108
#10
Huagang Peng, Qiwen Hu, Weilong Shang, Jizhen Yuan, Xiaopeng Zhang, Hui Liu, Ying Zheng, Zhen Hu, Yi Yang, Li Tan, Shu Li, Xiaomei Hu, Ming Li, Xiancai Rao
OBJECTIVES: Vancomycin-intermediate Staphylococcus aureus (VISA) strains have spread globally. We previously isolated an ST239 VISA (XN108) with a vancomycin MIC of 12 mg/L. The mechanism for XN108 resistance to vancomycin was investigated in this study. METHODS: Genome comparison was performed to characterize mutations that might contribute to the XN108 resistance phenotype. The novel mutation WalK(S221P) was identified and investigated using allelic replacement experiments...
December 20, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27998822/novel-rapid-pcr-for-the-detection-of-ile491phe-rpob-mutation-of-mycobacterium-tuberculosis-a-rifampicin-resistance-conferring-mutation-undetected-by-commercial-assays
#11
Emmanuel Andre, Léonie Goeminne, Alexandre Colmant, Patrick Beckert, Stefan Niemann, Michel Delmee
OBJECTIVES: Neither the liquid medium-based Bactec MGIT, nor commercial molecular assays such as the Xpert MTB/RIF and the MTBDRplus V2.0 assays are capable of detecting up to 30% of rifampicin-resistant Mycobacterium tuberculosis (MTB) strains in Swaziland due to the large proportion of the rpoB Ile491Phe mutation. In other countries, the frequency of this mutation is thought to be low. METHODS: We designed a real-time multiplex allele-specific (MAS) PCR assays to identify the rpoB Ile491Phe mutation responsible for these undetected resistant MTB strains...
December 17, 2016: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/27994580/correlation-of-rpob-mutations-with-minimal-inhibitory-concentration-of-rifampin-and-rifabutin-in-mycobacterium-tuberculosis-in-an-hiv-aids-endemic-setting-south-africa
#12
Ivy Rukasha, Halima M Said, Shaheed V Omar, Hendrik Koornhof, Andries W Dreyer, Alfred Musekiwa, Harry Moultrie, Anwar A Hoosen, Gilla Kaplan, Dorothy Fallows, Nazir Ismail
Treatment of tuberculosis (TB) and HIV co-infections is often complicated by drug-to-drug interactions between anti-mycobacterial and anti-retroviral agents. Rifabutin (RFB) is an alternative to rifampin (RIF) for TB regimens and is recommended for HIV patients concurrently receiving protease inhibitors because of reduced induction of CYP3A4. This study sought to determine the proportion of RFB susceptible isolates among RIF-resistant strains in a high HIV prevalence setting in South Africa. In addition, the study explored the association between rpoB mutations and minimum inhibitory concentrations (MIC) of RIF and RFB...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27994230/the-complete-12%C3%A2-mb-genome-and-transcriptome-of-nonomuraea-gerenzanensis-with-new-insights-into-its-duplicated-magic-rna-polymerase
#13
Valeria D'Argenio, Mauro Petrillo, Daniela Pasanisi, Caterina Pagliarulo, Roberta Colicchio, Adelfia Talà, Maria Stella de Biase, Mario Zanfardino, Emanuela Scolamiero, Chiara Pagliuca, Antonio Gaballo, Annunziata Gaetana Cicatiello, Piergiuseppe Cantiello, Irene Postiglione, Barbara Naso, Angelo Boccia, Miriana Durante, Luca Cozzuto, Paola Salvatore, Giovanni Paolella, Francesco Salvatore, Pietro Alifano
In contrast to the widely accepted consensus of the existence of a single RNA polymerase in bacteria, several actinomycetes have been recently shown to possess two forms of RNA polymerases due the to co-existence of two rpoB paralogs in their genome. However, the biological significance of the rpoB duplication is obscure. In this study we have determined the genome sequence of the lipoglycopeptide antibiotic A40926 producer Nonomuraea gerenzanensis ATCC 39727, an actinomycete with a large genome and two rpoB genes, i...
December 2016: Scientific Reports
https://www.readbyqxmd.com/read/27942356/rapid-detection-of-rifampicin-and-isoniazid-resistant-mycobacterium-tuberculosis-using-real-time-pcr
#14
Leyla Sahebi, Khalil Ansarin, Amir Monfaredan, Safar Farajnia, Seiran Nili, Majid Khalili
BACKGROUND: Accurate and rapid detection of drug-resistant Mycobacterium tuberculosis is fundamental for the successful treatment of tuberculosis (TB). OBJECTIVES: The aim of this study was to determine the frequency of common mutations leading to isoniazid (INH) and rifampicin (RMP) resistance. PATIENTS AND METHODS: In a cross-sectional study carried out in 2014, 90 patients with M. tuberculosis from five border provinces of Iran were selected...
October 2016: Jundishapur Journal of Microbiology
https://www.readbyqxmd.com/read/27931690/evaluation-of-the-genotype-mtbdrplus-assay-for-detection-of-rifampicin-and-isoniazid-resistant-mycobacterium-tuberculosis-isolates-in-central-ethiopia
#15
Zufan Bedewi Omer, Yalemtsehay Mekonnen, Adane Worku, Aboma Zewde, Girmay Medhin, Temesgen Mohammed, Rembert Pieper, Gobena Ameni
OBJECTIVE/BACKGROUND: Multidrug-resistant tuberculosis (MDR-TB) is growing globally and becoming a major challenge for national TB control programs. Therefore, rapid identification of MDR strains of Mycobacterium tuberculosis and monitoring their transmission could contribute significantly to the control of TB. The GenoType MTBDRplus assay has been recommended by the World Health Organization to identify rifampicin (RIF)- and isoniazid (INH)-resistant M. tuberculosis isolates. This study was carried out to evaluate the performance of the GenoType MTBDRplus assay for the detection of RIF- and INH-resistant M...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/27919693/performance-evaluation-of-xpert-mtb-rif-in-a-moderate-tuberculosis-incidence-compared-with-taqman-mtb-and-trcrapid-m-tb
#16
Kazunari Tsuyuguchi, Hideaki Nagai, Kenji Ogawa, Tomoshige Matsumoto, Kozo Morimoto, Akiko Takaki, Satoshi Mitarai
Xpert MTB/RIF is an automated nucleic acid amplification test (NAT) that can detect the presence of Mycobacterium tuberculosis complex (MTC) in clinical specimens as well as rifampicin (RIF) resistance resulting from rpoB mutation. Despite its high sensitivity and specificity for diagnosing tuberculosis (TB) with or without RIF resistance, the clinical performance of the test is variable. In this study, we evaluated the performance of Xpert MTB/RIF in a setting of moderate TB burden and high medical resources...
February 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/27908688/increased-production-of-l-serine-in-escherichia-coli-through-adaptive-laboratory-evolution
#17
Hemanshu Mundhada, Jose M Seoane, Konstantin Schneider, Anna Koza, Hanne B Christensen, Tobias Klein, Patrick V Phaneuf, Markus Herrgard, Adam M Feist, Alex T Nielsen
L-serine is a promising building block biochemical with a high theoretical production yield from glucose. Toxicity of L-serine is however prohibitive for high-titer production in E. coli. Here, E. coli lacking L-serine degradation pathways was evolved for improved tolerance by gradually increasing L-serine concentration from 3 to 100g/L using adaptive laboratory evolution (ALE). Genome sequencing of isolated clones revealed multiplication of genetic regions, as well as mutations in thrA, thereby showing a potential mechanism of serine inhibition...
January 2017: Metabolic Engineering
https://www.readbyqxmd.com/read/27903459/true-rifampicin-resistance-missed-by-the-mgit-prevalence-of-this-pheno-genotype-in-the-uk-and-ireland-after-18-month-surveillance
#18
Ximena Gonzalo, Pauline Claxton, Tim Brown, Lorraine Montgomery, Margaret Fitzgibbon, Ian Laurenson, Francis Drobniewski
OBJECTIVES: To characterise rifampicin resistant strains missed by the MGIT 960 system but not by egg-based media in the UK and Ireland and to ascertain their prevalence. METHODS: All strains sent for second line susceptibility testing were prospectively collected. Drug Susceptibility Testing was performed by Resistance Ratio (RR), Proportion Method (PM), MGIT 960 and MIC determination by microdilution. Rifampicin resistance conferring mutations were detected with line probe assays and sequencing...
November 26, 2016: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/27902737/a-comparison-of-the-sensititre-mycotb-plate-the-bactec-mgit-960-and-a-microarray-based-molecular-assay-for-the-detection-of-drug-resistance-in-clinical-mycobacterium-tuberculosis-isolates-in-moscow-russia
#19
Elena Y Nosova, Danila V Zimenkov, Anastasia A Khakhalina, Alexandra I Isakova, Ludmila Y Krylova, Marina V Makarova, Ksenia Y Galkina, Maria A Krasnova, Svetlana G Safonova, Vitaly I Litvinov, Dmitry A Gryadunov, Elena M Bogorodskaya
BACKGROUND: The goal of this study was to compare the consistency of three assays for the determination of the drug resistance of Mycobacterium tuberculosis (MTB) strains with various resistance profiles isolated from the Moscow region. METHODS: A total of 144 MTB clinical isolates with a strong bias toward drug resistance were examined using Bactec MGIT 960, Sensititre MycoTB, and a microarray-based molecular assay TB-TEST to detect substitutions in the rpoB, katG, inhA, ahpC, gyrA, gyrB, rrs, eis, and embB genes that are associated with resistance to rifampin, isoniazid, fluoroquinolones, second-line injectable drugs and ethambutol...
2016: PloS One
https://www.readbyqxmd.com/read/27895008/de-novo-emergence-of-genetically-resistant-mutants-of-mycobacterium-tuberculosis-from-the-persistence-phase-cells-formed-against-antituberculosis-drugs-in-vitro
#20
Jees Sebastian, Sharmada Swaminath, Rashmi Ravindran Nair, Kishor Jakkala, Atul Pradhan, Parthasarathi Ajitkumar
Bacterial persisters are a subpopulation of cells that can tolerate lethal concentrations of antibiotics. However, the possibility of the emergence of genetically resistant mutants from antibiotic persister cell population, upon continued exposure to lethal concentrations of antibiotics, remained unexplored. In the present study, we found that Mycobacterium tuberculosis (Mtb) cells exposed continuously to lethal concentrations of rifampicin (RIF) or moxifloxacin (MXF) for prolonged durations showed killing, RIF/MXF persistence, and regrowth phases...
November 28, 2016: Antimicrobial Agents and Chemotherapy
keyword
keyword
95284
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"