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loop-mediated isothermal amplification

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https://www.readbyqxmd.com/read/28937697/one-step-detection-of-microrna-with-high-sensitivity-and-specificity-via-target-triggered-loop-mediated-isothermal-amplification-tt-lamp
#1
Yuanyuan Sun, Hui Tian, Chenghui Liu, Yueying Sun, Zhengping Li
A novel one-step microRNA assay is developed based on a target-triggered loop-mediated isothermal amplification (TT-LAMP) mechanism, which enables the accurate detection of as low as 100 aM (1 zmol) microRNA with simple one-step operation by using only one-type of DNA polymerase.
September 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28934984/a-simple-and-rapid-identification-method-for-newly-emerged-porcine-deltacoronavirus-with-loop-mediated-isothermal-amplification
#2
Fanfan Zhang, Yu Ye, Deping Song, Nannan Guo, Qi Peng, Anqi Li, Xingrong Zhou, Yanjun Chen, Min Zhang, Dongyan Huang, Yuxin Tang
BACKGROUND: Porcine Deltacoronavirus (PDCoV) is a newly emerged enteropathogenic coronavirus that causes diarrhea and mortality in neonatal piglets. PDCoV has spread to many countries around the world, leading to significant economic losses in the pork industry. Therefore, a rapid and sensitive method for detection of PDCoV in clinical samples is urgently needed. RESULTS: In this study, we developed a single-tube one-step reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay specific for nucleocapsid gene to diagnose and monitor PDCoV infections...
September 21, 2017: Biological Research
https://www.readbyqxmd.com/read/28934494/derivatives-of-bst-like-gss-polymerase-with-improved-processivity-and-inhibitor-tolerance
#3
Igor P Oscorbin, Ekaterina A Belousova, Ulyana A Boyarskikh, Aleksandr I Zakabunin, Evgeny A Khrapov, Maksim L Filipenko
At the moment, one of the actual trends in medical diagnostics is a development of methods for practical applications such as point-of-care testing, POCT or research tools, for example, whole genome amplification, WGA. All the techniques are based on using of specific DNA polymerases having strand displacement activity, high synthetic processivity, fidelity and, most significantly, tolerance to contaminants, appearing from analysed biological samples or collected under purification procedures. Here, we have designed a set of fusion enzymes based on catalytic domain of DNA polymerase I from Geobacillus sp...
September 19, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28929022/development-and-evaluation-of-rapid-novel-isothermal-amplification-assays-for-important-veterinary-pathogens-chlamydia-psittaci-and-chlamydia-pecorum
#4
Martina Jelocnik, Md Mominul Islam, Danielle Madden, Cheryl Jenkins, James Branley, Scott Carver, Adam Polkinghorne
BACKGROUND: Chlamydia psittaci and Chlamydia pecorum are important veterinary pathogens, with the former also being responsible for zoonoses, and the latter adversely affecting koala populations in Australia and livestock globally. The rapid detection of these organisms is still challenging, particularly at the point-of-care (POC). In the present study, we developed and evaluated rapid, sensitive and robust C. psittaci-specific and C. pecorum-specific Loop Mediated Isothermal Amplification (LAMP) assays for detection of these pathogens...
2017: PeerJ
https://www.readbyqxmd.com/read/28915693/the-application-of-is6110-baced-loop-mediated-isothermal-amplification-lamp-in-the-early-diagnosis-of-tuberculous-meningitis
#5
Wen-Wen Sun, Qin Sun, Li-Ping Yan, Qing Zhang
Here, we evaluated the potential activity of rapid Mycobacterium tuberculosis detection with loop-mediated isothermal amplification (LAMP), for the early diagnosis of tuberculous meningitis (TBM). Patients with suspected TBM from January 2014 to December 2015 were reviewed retrospectively. The cerebrospinalfluid(CSF) was collected. Acid-fast bacillus (AFB) staining, MGIT 960 culture, real-time fluorescent quantitative polymerase chain reaction (RTFQ PCR) and LAMP were performed. A total of 200 patients were included in the study...
August 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28913832/corrigendum-rapid-and-visual-chlamydia-trachomatis-detection-using-loop-mediated-isothermal-amplification-and-hydroxynaphthol-blue
#6
I Choopara, N Arunrut, W Kiatpathomchai, D Dean, N Somboonna
No abstract text is available yet for this article.
October 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28913529/a-novel-method-to-control-carryover-contamination-in-isothermal-nucleic-acid-amplification
#7
Cuiping Ma, Fuxin Wang, Xiudan Wang, Lingzhi Han, Hao Jing, Heng Zhang, Chao Shi
We developed a novel method to control carryover contamination in loop-mediated isothermal amplification (LAMP) by primer engineering to carry recognition sites for a restriction endonuclease, providing a robust ability to eliminate carryover contaminants.
September 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28911361/detecting-mycobacterium-tuberculosis-using-the-loop-mediated-isothermal-amplification-test-in-south-africa
#8
S Reddy, S Ntoyanto, Y Sakadavan, T Reddy, S Mahomed, M Dlamini, B Spooner, G Ramjee, A Coutsoudis, N Ngomane, K Naidoo, K Mlisana, P Kiepiela
SETTING: In South Africa, KwaZulu-Natal is the epicentre of the human immunodeficiency virus (HIV) epidemic, where approximately 70% of people with tuberculosis (TB) are co-infected with HIV. Undiagnosed TB contributes to high mortality in HIV-infected patients. Delays in diagnosing TB and treatment initiation result in prolonged transmission and increased infectiousness. OBJECTIVE: To evaluate the LoopampTM MTBC Detection kit (TB-LAMP; based on the loop-mediated isothermal amplification assay), smear microscopy and Xpert test with the gold standard of mycobacterial culture...
October 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28911360/evaluation-of-the-tb-lamp-assay-for-the-rapid-diagnosis-of-pulmonary-tuberculosis-in-northern-india
#9
R Yadav, N Sharma, R Khaneja, P Agarwal, A Kanga, D Behera, S Sethi
SETTING: A tertiary care hospital in North India. OBJECTIVE: To evaluate a commercial kit-based loop-mediated isothermal amplification (TB-LAMP) assay for the diagnosis of pulmonary tuberculosis (PTB). DESIGN: A total of 530 patients presenting with PTB symptoms were enrolled and one sputum sample was collected from each patient. The TB-LAMP assay (Loopamp™ MTBC Detection kit) was performed on the raw sputum sample. The remaining sample was used for smear microscopy and mycobacterial culture...
October 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28903726/a-novel-diagnostic-method-for-malaria-using-loop-mediated-isothermal-amplification-lamp-and-minion%C3%A2-nanopore-sequencer
#10
Kazuo Imai, Norihito Tarumoto, Kazuhisa Misawa, Lucky Ronald Runtuwene, Jun Sakai, Kyoko Hayashida, Yuki Eshita, Ryuichiro Maeda, Josef Tuda, Takashi Murakami, Shigefumi Maesaki, Yutaka Suzuki, Junya Yamagishi, Takuya Maeda
BACKGROUND: A simple and accurate molecular diagnostic method for malaria is urgently needed due to the limitations of conventional microscopic examination. In this study, we demonstrate a new diagnostic procedure for human malaria using loop mediated isothermal amplification (LAMP) and the MinION™ nanopore sequencer. METHODS: We generated specific LAMP primers targeting the 18S-rRNA gene of all five human Plasmodium species including two P. ovale subspecies (P...
September 13, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28888887/the-novel-loop-mediated-isothermal-amplification-based-confirmation-methodology-on-the-bacteria-in-viable-but-non-culturable-vbnc-state
#11
REVIEW
Yanmei Li, Ling Yang, Jie Fu, Muxia Yan, Dingqiang Chen, Li Zhang
As a self-protection mechanism, the viable but non-culturable (VBNC) state provides the ability against conventional detection methods among various foodborne pathogens. The ability of forming colonies is lost while metabolism is still maintaining in VBNC state cells. Recently, ethidium monoazide (EMA) and propidium monoazide (PMA) have been widely applied on the detection of foodborne pathogens in VBNC state. Combined with loop-mediated isothermal amplification (LAMP), the PMA/EMA-LAMP showed a significant priority in high sensitivity, specificity and rapidity over conventional PCR based assays...
September 6, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28887007/yersinia-pestis-detection-by-loop-mediated-isothermal-amplification-combined-with-magnetic-bead-capture-of-dna
#12
Na Feng, Yazhou Zhou, Yanxiao Fan, Yujing Bi, Ruifu Yang, Yusen Zhou, Xiaoyi Wang
We developed a loop-mediated isothermal amplification (LAMP) assay for the detection of Y. pestis by targeting the 3a sequence on chromosome. All 11 species of the genus Yersinia were used to evaluate the specificity of LAMP and PCR, demonstrating that the primers had a high level of specificity. The sensitivity of LAMP or PCR was 2.3 or 23CFU for pure culture, whereas 2.3×10(4) or 2.3×10(6)CFU for simulated spleen and lung samples. For simulated liver samples, the sensitivity of LAMP was 2.3×10(6)CFU, but PCR was negative at the level of 2...
August 26, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28881135/ultrasensitive-detection-of-viable-enterobacter-sakazakii-by-a-continual-cascade-nanozyme-biosensor
#13
Li Zhang, Yuting Chen, Nan Cheng, Yuancong Xu, Kunlun Huang, Yunbo Luo, Peixia Wang, Demin Duan, Wentao Xu
Recent outbreaks of life-threatening neonatal infections linked to Enterobacter sakazakii (ES) heightened the need to develop rapid and ultrasensitive detection strategies, especially those capable of determining the viable cells. This study introduced a continual cascade nanozyme biosensor for the detection of viable ES based on propidium monoazide (PMA), loop-mediated isothermal amplification (LAMP), and Nanozyme strip. The ompA gene of ES was determined using FITC-modified and BIO-modified primers in the LAMP process...
September 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28875502/modified-rs-lamp-assay-and-use-of-lateral-flow-devices-lfds-for-rapid-detection-of-leifsonia-xyli-subsp-xyli-lxx
#14
Natalie Naidoo, Meenu Ghai, Kiresen Moodley, Lwamkilekele Mkhize, Lauren Martin, Sharon McFarlane, Stuart Rutherford
Ratoon stunt caused by bacterium Leifsonia xyli subsp. xyli (Lxx) results in substantial yield losses in sugarcane (Saccharum spp. L. hybrid). Since RS does not produce reliable symptoms in the field, laboratory-based techniques are necessary for detection. Loop-Mediated Isothermal Amplification (LAMP) assay overcomes the limitations of laboratory-based techniques which are costly, time consuming and cannot be used for near-field detection. A sensitive LAMP assay was developed to detect Lxx at 65°C in 30 min...
September 6, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28869845/a-microdevice-for-rapid-monoplex-and-colorimetric-detection-of-foodborne-pathogens-using-a-centrifugal-microfluidic-platform
#15
Abkar Sayad, Fatimah Ibrahim, Shah Mukim Uddin, Jongman Cho, Marc Madou, Kwai Lin Thong
Outbreaks of foodborne diseases have become a global health concern; hence, many improvements and developments have been made to reduce the risk of food contamination. We developed a centrifugal microfluidic automatic wireless endpoint detection system integrated with loop mediated isothermal amplification (LAMP) for monoplex pathogen detection. Six identical sets were designed on the microfluidic compact disc (CD) to perform 30 genetic analyses of three different species of foodborne pathogens. The consecutive loading, mixing, and aliquoting of the LAMP primers/reagents and DNA sample solutions were accomplished using an optimized square-wave microchannel, metering chambers and revulsion per minute (RPM) control...
August 31, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28866364/development-of-rapid-and-highly-sensitive-detection-of-bean-common-mosaic-necrosis-virus-in-leguminous-crops-using-loop-mediated-isothermal-amplification-assay
#16
Siwon Lee, Heejung Kim, Jin-Young Lee, Jae-Young Rho
Bean common mosaic necrosis virus (BCMNV) is a plant pathogenic virus that can infect leguminous crops such as kidney beans, sunn hemp, red beans, and mung beans. BCMNV has not been reported in Korea and is classified as a quarantine plant virus. Currently, the standard diagnostic method for diagnosis of BCMNV is reverse transcription (RT)-nested PCR system. However a more rapid monitoring system is needed to enable the testing of more samples. The use of highly efficient loop-mediated isothermal amplification (LAMP) assay for its detection has not yet been reported, and development of LAMP for detecting BCMNV in this study...
September 1, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28863185/loop-mediated-isothermal-amplification-lamp-assay-a-rapid-detection-tool-for-identifying-red-fox-vulpes-vulpes-dna-in-the-carcasses-of-harbour-porpoises-phocoena-phocoena
#17
Teresa Heers, Abbo van Neer, André Becker, Miguel Luca Grilo, Ursula Siebert, Amir Abdulmawjood
Carcasses of wild animals are often visited by different scavengers. However, determining which scavenger caused certain types of bite marks is particularly difficult and knowledge thereof is lacking. Therefore, a loop-mediated isothermal amplification (LAMP) assay (target sequence cytochrome b) was developed to detect red fox DNA in carcasses of harbour porpoises. The MSwab™ method for direct testing without prior DNA isolation was validated. As a detection device, the portable real-time fluorometer Genie® II was used, which yields rapid results and can be used in field studies without huge laboratory equipment...
2017: PloS One
https://www.readbyqxmd.com/read/28862690/variations-in-the-rate-of-infestations-of-dogs-with-zoonotic-nematodes-and-the-contamination-of-soil-in-different-environments
#18
Maria Bernadeta Studzińska, Marta Demkowska-Kutrzepa, Anna Borecka, Michał Meisner, Krzysztof Tomczuk, Monika Roczeń-Karczmarz, Teresa Kłapeć, Zahrai Abbass, Alicja Cholewa
Companion animals are an important aspect in human life. However, they may also be considered a source of pathogens. An example of zoonotic parasitoses is toxocarosis or cutaneous larva migrans (CLM). The aim of the study was to detect zoonotic nematodes of dogs living in different areas and the intensity of contamination in parasite polluted environments that are hazardous to human health. The fecal samples were examined using standard flotation and decantation methods as well as McMaster's quantitative technique...
September 1, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28858491/rapid-sensitive-and-carryover-contamination-free-loop-mediated-isothermal-amplification-coupled-visual-detection-method-for-candidatus-liberibacter-asiaticus
#19
Wenjuan Qian, Youqing Meng, Ying Lu, Cui Wu, Rui Wang, Liu Wang, Cheng Qian, Zunzhong Ye, Jian Wu, Yibin Ying
Huanglongbing is a devastating citrus disease, and 'Candidatus Liberibacter asiaticus' (Las) is the most prevalent huanglongbing-associated bacterium. Its field detection remains challenging. In this work, a visual, rapid, sensitive, and carryover contamination-free method was developed for field detection of Las. Leaf samples were treated with 500 μL of 0.5 M sodium hydroxide solution for 3 min, and 50-fold dilutions were directly amplified by loop-mediated isothermal amplification. Then, a novel SYTO-9-based visual detection method was used to evaluate amplification results without uncapping operation...
September 13, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28855485/potential-of-next-generation-poct-in-infectious-disease-rapid-test
#20
Naoto Shimetani
Real-time test results are necessary for early diagnosis and in determining treatment orientation in medical practice. Point of Care Testing (POCT) is a testing system that provides beneficial and helpful information for diagnosis and treatment through real-time testing at the bedside. Therefore, POCT has high utility value in the field of infectious diseases as a rapid test that provides, within the consultation hours, useful information for initial treatment.Infectious disease rapid test kits are commercially available for a wide variety of prophlogistic pathogen targets, including bacterial, viral, fungal, protozoal, and other disease agents...
2017: Medical Mycology Journal
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