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loop-mediated isothermal amplification

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https://www.readbyqxmd.com/read/28318383/detection-of-brucellosis-in-sika-deer-cervus-nippon-through-loop-mediated-isothermal-amplification-lamp
#1
Qianhong Liu, Jie Wei, Qingsong Sun, Ben Wang, Yuting Wang, Ying Hu, Wenrong Wu
Brucellosis (Brucella bovis) in sika deer ( Cervus nippon ) can cause enormous losses to stag breeding, especially in areas in which stag breeding has become an important industry. It also poses a threat to humans because it is a zoonotic disease. Use of the loop-mediated isothermal amplification (LAMP) assay has been poorly described in the diagnosis of brucellosis in deer. We developed a LAMP assay targeting the omp25 gene sequence to detect brucellosis (Brucella bovis) in sika deer. The reaction can be completed in 60 min at 63 C and, with a detection limit of 17 pg, it was more sensitive than conventional PCR, with its detection limit of 1...
March 20, 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/28317856/a-smartphone-based-diagnostic-platform-for-rapid-detection-of-zika-chikungunya-and-dengue-viruses
#2
Aashish Priye, Sara W Bird, Yooli K Light, Cameron S Ball, Oscar A Negrete, Robert J Meagher
Current multiplexed diagnostics for Zika, dengue, and chikungunya viruses are situated outside the intersection of affordability, high performance, and suitability for use at the point-of-care in resource-limited settings. Consequently, insufficient diagnostic capabilities are a key limitation facing current Zika outbreak management strategies. Here we demonstrate highly sensitive and specific detection of Zika, chikungunya, and dengue viruses by coupling reverse-transcription loop-mediated isothermal amplification (RT-LAMP) with our recently developed quenching of unincorporated amplification signal reporters (QUASR) technique...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28304013/loop-mediated-isothermal-amplification-tb-lamp-a-step-forward-in-the-diagnosis-of-tuberculosis
#3
Hanieya Saiyed, Sarosh Fatima
No abstract text is available yet for this article.
March 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28303825/evaluation-of-loop-mediated-isothermal-amplification-assay-for-rapid-diagnosis-of-acanthamoeba-keratitis
#4
Abhishek Mewara, Sumeeta Khurana, Shakila Yoonus, Kirti Megha, Parveen Tanwar, Amit Gupta, Rakesh Sehgal
BACKGROUND: The clinical features of Acanthamoeba keratitis (AK) are non-specific and closely resemble bacterial, viral and fungal keratitis. MATERIALS AND METHODS: We compared loop-mediated isothermal amplification (LAMP) with microscopy, non-nutrient agar (NNA) culture and polymerase chain reaction (PCR) in clinical suspects of AK. RESULTS: Of 52 clinical samples (42 AK suspects and 10 proven bacterial, viral or fungal keratitis), 3 were positive by direct microscopy (sensitivity 60%, confidence interval [CI]: 17%-92...
January 2017: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28299704/loop-mediated-isothermal-amplification-and-lfd-combination-for-detection-of-plasmodium-falciparum-and-plasmodium-vivax
#5
Darin Kongkasuriyachai, Suganya Yongkiettrakul, Wansika Kiatpathomchai, Narong Arunrut
Loop-mediated isothermal amplification (LAMP) has been used to detect several pathogens including malaria parasites from field and clinical samples. In this protocol, the malaria LAMP technology is developed to differentiate between Plasmodium falciparum (Pf) and Plasmodium vivax (Pv) species by targeting the dihydrofolate reductase thymidylate synthase (dhfr-ts) gene, a known target for the antifolate class of drugs such as Pyrimethamine. LAMP primer sets are designed and validated for species specific amplification...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28290475/the-development-of-loop-mediated-isothermal-amplification-lamp-assays-for-the-rapid-authentication-of-five-forbidden-vegetables-in-strict-vegetarian-diets
#6
Meng-Shiou Lee, Ting-Ying Su, Yi-Yang Lien, Shyang-Chwen Sheu
Plant-based food ingredients such as garlic, Chinese leek, Chinese onion, green onion and onion are widely used in many cuisines around the world. However, these ingredients known as the "five forbidden vegetables" (FFVs) are not allowed in some vegetarian diets. In this study, a loop-mediated isothermal amplification (LAMP) assay was developed for the detection of FFVs using five respective LAMP primer sets. The specific primers targeted the ITS1-5.8S-ITS2 nuclear ribosomal DNA sequence regions among the five vegetables...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28288843/non-invasive-diagnosis-of-cutaneous-leishmaniasis-by-the-direct-boil-loop-mediated-isothermal-amplification-method-and-minion%C3%A2-nanopore-sequencing
#7
Kazuo Imai, Norihito Tarumoto, Kiyoko Amo, Makoto Takahashi, Naoya Sakamoto, Atsushi Kosaka, Yasuyuki Kato, Kei Mikita, Jun Sakai, Takashi Murakami, Yutaka Suzuki, Shigefumi Maesaki, Takuya Maeda
Cutaneous leishmaniasis (CL) is gaining attention as a public health problem. We present two cases of CL imported from Syria and Venezuela in Japan. We diagnosed them as CL non-invasively by the direct boil loop-mediated isothermal amplification method and an innovative sequencing method using the MinION™ sequencer. This report demonstrates that our procedure could be useful for the diagnosis of CL in both clinical and epidemiological settings.
March 11, 2017: Parasitology International
https://www.readbyqxmd.com/read/28284694/salmonella-detection-in-powdered-dairy-products-using-a-novel-molecular-tool
#8
Yueming Zhao, Xia Jiang, Yanyan Qu, Ruili Pan, Xinyi Pang, Yujun Jiang, Chaoxin Man
In this study, we developed a rapid, specific, and sensitive loop-mediated isothermal amplification technique combined with a lateral flow dipstick (LAMP-LFD) method to detect Salmonella targeting the siiA gene in powdered infant formula (PIF). The specificity of the detection method (LAMP-LFD) approached 100% using 21 Salmonella and 31 non-Salmonella bacterial strains. This detection method exhibited high sensitivity limits for pure cultures at 3.7 cfu/mL and in PIF at 2.2 cfu/g without enrichment. To evaluate the applicability of the LAMP-LFD method, we detected 60 positive PIF samples and 20 negative PIF samples...
March 8, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28276674/precipitation-of-peg-carboxyl-modified-gold-nanoparticles-with-magnesium-pyrophosphate-a-new-platform-for-real-time-monitoring-of-loop-mediated-isothermal-amplification
#9
Ailin Qin, Lok Tin Fu, Jacky K F Wong, Li Yin Chau, Shea Ping Yip, Thomas M H Lee
Gold nanoparticles have proven to be promising for decentralized nucleic acid testing by virtue of their simple visual readout and absorbance-based quantification. A major challenge toward their practical application is to achieve ultrasensitive detection without compromising simplicity. The conventional strategy of thermocycling amplification is unfavorable (because of both instrumentation and preparation of thermostable oligonucleotide-modified gold nanoparticle probes). Herein, on the basis of a previously unreported co-precipitation phenomenon between thiolated poly(ethylene glycol)/11-mercaptoundecanoic acid co-modified gold nanoparticles and magnesium pyrophosphate crystals (an isothermal DNA amplification reaction byproduct), a new ultrasensitive and simple DNA assay platform is developed...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28274126/-selection-of-laboratory-procedures-to-detect-toxigenic-by-the-2-step-method
#10
Yoko Tanino, Mai Kodama, Hiroomi Daicho, Yoshito Miyauchi, Towa Yasumoto, Yukiji Yamada, Noriko Kyotani, Satoko Kurahashi, Masaji Ushiyama, Takeshi Kimura, Toshiaki Komori, Yumiko Fujitomo, Masaki Nakanishi, Naohisa Fujita
The 2-step method is an algorithm to detect toxigenic Clostridium difficile. We herein compared the sensitivities and specificities of an enzyme immunoassay (toxin A/B-EIA), toxigenic culture (TC-EIA), Loop-Mediated Isothermal Amplification assay (LAMP), and Xpert C. difficile (Xpert) with the detection of the toxin B gene by a polymerase chain reaction (PCR). The results obtained showed that the sensitivities and specificities of toxin A/B-EIA, Xpert, TC-EIA, and LAMP were 30 and 100%, 87.2 and 100%, 97.5 and 89...
March 22, 2017: JARMAM: Journal of the Association for Rapid Method and Automation in Microbiology
https://www.readbyqxmd.com/read/28271692/colorimetric-detection-of-23-human-papillomavirus-genotypes-by-loop-mediated-isothermal-amplification
#11
Junxiao Lin, Biao Ma, Jiehong Fang, Ye Wang, Haizhen He, Wei Lin, Wei Su, Mingzhou Zhang
BACKGROUND: Human papillomavirus (HPV) infection is linked to cervical cancer. With the technological development of molecular biology and epidemiology, detection and treatment of HPV has become an important mean to prevent cervical cancer. METHODS: A simple, rapid, and sensitive colorimetric loop-mediated isothermal amplification (LAMP) method was established herein to detect 23 HPV genotypes. The sequences of the primers for the LAMP reaction were located in the L1 gene of the HPV genome...
March 1, 2017: Clinical Laboratory
https://www.readbyqxmd.com/read/28257512/quantitative-molecular-diagnostic-assays-of-grain-washes-for-claviceps-purpurea-are-correlated-with-visual-determinations-of-ergot-contamination
#12
Alexia Comte, Tom Gräfenhan, Matthew G Links, Sean M Hemmingsen, Tim J Dumonceaux
We examined the epiphytic microbiome of cereal grain using the universal barcode chaperonin-60 (cpn60). Microbial community profiling of seed washes containing DNA extracts prepared from field-grown cereal grain detected sequences from a fungus identified only to Class Sordariomycetes. To identify the fungal sequence and to improve the reference database, we determined cpn60 sequences from field-collected and reference strains of the ergot fungus, Claviceps purpurea. These data allowed us to identify this fungal sequence as deriving from C...
2017: PloS One
https://www.readbyqxmd.com/read/28250618/utility-of-loop-mediated-isothermal-amplification-assay-polymerase-chain-reaction-and-elisa-for-diagnosis-of-leptospirosis-in-south-indian-patients
#13
Mallika Sengupta, Abhilash Kundavaram Paul Prabhakar, Sowmya Satyendra, David Thambu, Ooriapadickal Cherian Abraham, Veeraraghavan Balaji, Hua-Wei Chen, Chien-Chung Chao, Wei-Mei Ching, John Antony Jude Prakash
BACKGROUND: Leptospirosis is a zoonotic disease which requires laboratory diagnosis for confirmation. MATERIALS AND METHODS: In this study serum samples from adults with acute undifferentiated fever (duration ≤15 days) were tested for IgM antibodies to Leptospira by ELISA, PCR for rrs gene and loop-mediated isothermal amplification (LAMP) assay for LipL32 and LipL41. RESULTS: Among the 150 sera tested, three were positive by PCR, LAMP and IgM ELISA/modified Faines' criteria, two by only PCR; seven only by LAMP assay and forty fulfilled modified Faine's criteria (illness clinically compatible and IgM ELISA positive for leptospirosis)...
January 2017: Journal of Global Infectious Diseases
https://www.readbyqxmd.com/read/28246533/use-of-molecular-methods-for-the-rapid-mass-detection-of-schistosoma-mansoni-platyhelminthes-trematoda-in-biomphalaria-spp-gastropoda-planorbidae
#14
Roberta Lima Caldeira, Liana Konovaloffi Jannotti-Passos, Omar Dos Santos Carvalho
The low stringency-polymerase chain reaction (LS-PCR) and loop-mediated isothermal amplification (LAMP) assays were used to detect the presence of S. mansoni DNA in (1) Brazilian intermediate hosts (Biomphalaria glabrata, B. straminea, and B. tenagophila) with patent S. mansoni infections, (2) B. glabrata snails with prepatent S. mansoni infections, (3) various mixtures of infected and noninfected snails; and (4) snails infected with other trematode species. The assays showed high sensitivity and specificity and could detect S...
2017: Journal of Tropical Medicine
https://www.readbyqxmd.com/read/28242293/lyophilized-visually-readable-loop-mediated-isothermal-reverse-transcriptase-nucleic-acid-amplification-test-for-detection-ebola-zaire-rna
#15
Christoph Carter, Kevan Akrami, Drew Hall, Davey Smith, Eliah Aronoff-Spencer
Recent viral outbreaks highlight the need for reliable, yet broadly deployable diagnostics for detection of epidemic and emerging pathogens. In this study we designed and optimized methods to visually detect viral nucleic acid by isothermal amplification and SYBR dye intercalation. We designed and tested loop-mediated isothermal amplification (LAMP) primers and lyophilized reactions to optimize the detection of Zaire Ebola Virus (ZEBOV) and further evolved the LAMP platform to allow room-temperature storage for deployment in resource limited settings...
February 24, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28239371/loop-mediated-isothermal-amplification-label-based-gold-nanoparticles-lateral-flow-biosensor-for-detection-of-enterococcus-faecalis-and-staphylococcus-aureus
#16
Yi Wang, Hui Li, Yan Wang, Lu Zhang, Jianguo Xu, Changyun Ye
The report describes a simple, rapid and sensitive assay for visual and multiplex detection of Enterococcus faecalis and Staphylococcus aureus based on multiple loop-mediated isothermal amplification (mLAMP) and lateral flow biosensor (LFB). Detection and differentiation of the Ef0027 gene (E. faecalis-specific gene) and nuc gene (S. aureus-specific gene) were determined using fluorescein (FITC)-and digoxin-modified primers in the mLAMP process. In the presence of biotin- and FITC-/digoxin-modified primers, the mLAMP yielded numerous biotin- and FITC-/digoxin-attached duplex products, which were detected by LFB through biotin/streptavidin interaction (biotin on the duplex and streptavidin on the gold nanoparticle) and immunoreactions (FITC/digoxin on the duplex and anti-FITC/digoxin on the LFB test line)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28238079/development-and-application-of-a-rapid-user-friendly-and-inexpensive-method-to-detect-dehalococcoides-sp-reductive-dehalogenase-genes-from-groundwater
#17
Yogendra H Kanitkar, Robert D Stedtfeld, Paul B Hatzinger, Syed A Hashsham, Alison M Cupples
TaqMan probe-based quantitative polymerase chain reaction (qPCR) specific to the biomarker reductive dehalogenase (RDase) genes is a widely accepted molecular biological tool (MBT) for determining the abundance of Dehalococcoides sp. in groundwater samples from chlorinated solvent-contaminated sites. However, there are significant costs associated with this MBT. In this study, we describe an approach that requires only low-cost laboratory equipment (a bench top centrifuge and a water bath) and requires less time and resources compared to qPCR...
February 25, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28218268/rapid-and-sensitive-diagnoses-of-dry-root-rot-pathogen-of-chickpea-rhizoctonia-bataticola-taub-butler-using-loop-mediated-isothermal-amplification-assay
#18
Raju Ghosh, Avijit Tarafdar, Mamta Sharma
Dry root rot (DRR) caused by the fungus Rhizoctonia bataticola (Taub.) Butler, is an emerging disease in chickpea. The disease is often mistaken with other root rots like Fusarium wilt, collar rot and black root rot in chickpea. Therefore, its timely and specific detection is important. Current detection protocols are either based on mycological methods or on protocols involving DNA amplification by polymerase chain reaction (PCR). Here we report the rapid and specific detection of R. bataticola using loop-mediated isothermal amplification (LAMP) assay targeting fungal specific 5...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28214519/detection-and-quantification-of-soil-transmitted-helminths-in-environmental-samples-a-review-of-current-state-of-the-art-and-future-perspectives
#19
REVIEW
Isaac Dennis Amoah, Gulshan Singh, Thor Axel Stenström, Poovendhree Reddy
It is estimated that over a billion people are infected with soil-transmitted helminths (STHs) globally with majority occurring in tropical and subtropical regions of the world. The roundworm (Ascaris lumbricoides), whipworm (Trichuris trichiura), and hookworms (Ancylostoma duodenale and Necator americanus) are the main species infecting people. These infections are mostly gained through exposure to faecally contaminated water, soil or contaminated food and with an increase in the risk of infections due to wastewater and sludge reuse in agriculture...
May 2017: Acta Tropica
https://www.readbyqxmd.com/read/28211674/monte-carlo-modeling-based-digital-loop-mediated-isothermal-amplification-on-a-spiral-chip-for-absolute-quantification-of-nucleic-acids
#20
Yun Xia, Shuangqian Yan, Xian Zhang, Peng Ma, Wei Du, Xiaojun Feng, Bi-Feng Liu
Digital loop-mediated isothermal amplification (dLAMP) is an attractive approach for absolute quantification of nucleic acids with high sensitivity and selectivity. Theoretical and numerical analysis of dLAMP provides necessary guidance for the design and analysis of dLAMP devices. In this work, a mathematical model was proposed on the basis of the Monte Carlo method and the theories of Poisson statistics and chemometrics. To examine the established model, we fabricated a spiral chip with 1200 uniform and discrete reaction chambers (9...
March 21, 2017: Analytical Chemistry
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