Introduction
Discover Huankai’s Modified MSRV Agar Base, designed for the selective detection and isolation of motile Salmonella species, ensuring reliable food and environmental testing.
Discover Huankai’s Modified MSRV Agar Base, designed for the selective detection and isolation of motile Salmonella species, ensuring reliable food and environmental testing.
Discover Huankai’s Modified MSRV Agar Base, designed for the selective detection and isolation of motile Salmonella species, ensuring reliable food and environmental testing.
E. coli O157:H7 is a rod-shaped, gram negative bacterium. It is an enterohemorrhagic strain of the common E. coli bacterium and infection by the O157:H7 strain is commonly associated with hemorrhagic colitis. E. coli O157:H7 is recognized by its somatic (cell wall) antigen (O157) and its flagella antigen (H7). In addition, E. coli O157:H7 is known to produce Shiga-like toxins, which cause severe symptoms. While most patients can recover from the infection, up to 15% of the patients may develop hemolytic uremic syndrome, a type of kidney failure that could be fatal. Infection of E. coli O157:H7 usually results from consumption of poorly prepared food including undercooked meat (particularly ground beef), untreated water or raw unpasteurized milk.
E.coli O157:H7 TaqMan PCR Kit, 100 reactions
E.coli O157:H7 TaqMan PCR Probe/Primer Set and Controls, 100 reactions
For research use only and NOT intended for in vitro diagnostics.
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Storage Conditions and Product Stability
All kit components can be stored for 2 years after the date of production without showing any reduction in performance.
All kit components should be stored at -20°C upon arrival. Repeated thawing and freezing (> 2 x) of the Master Mix and Positive Control should be avoided, as this may affect the performance of the assay. If the reagents are to be used only intermittently, they should be frozen in aliquots.
| Component | Cat. TM41350 (100 preps) | Cat. TM41310 (100 preps) |
|---|---|---|
| MDx TaqMan 2X PCR Master Mix | 2 x 700 μL | – |
| E. coli O157:H7 Primer & Probe Mix | 280 μL | 280 μL |
| E. coli O157:H7 Positive Control | 150 μL | 150 μL |
| Nuclease-Free Water (Negative Control) | 1.25 mL | 1.25 mL |
| Product Insert | 1 | 1 |
Not all cyanobacterial strains produce toxins. However, the toxin-producing strains cannot be distinguished from the nontoxin-producing strains by traditional light microscopy, commonlyused to monitor water bodies. An alternative for the differentiation of potentially toxic strains from nontoxic strains is to use molecular methods to detect the presence of toxin biosynthetic genes. Such methods are already available and could be used for the detection and identification of potential microcystin and nodularin producers present in environmental samples (Attogene catalog number NA2024).
Screening for the toxin itself, can be very costly. In turn, real time PCR for the detection of a gene region responsible for assembling in cyanobacterial strains and environmental samples can be a key indicator for the prescense of cyanobacteria capable of expressing the aetokthonotoxin toxin. Attogen has thus, designed primer pairs and probes targeting a the conserved gene region in order to enable the amplification and detection of several producer genera using real time PCR. Screening for the toxin genes can save significant costs and act as a triage for samples needing to be analyzed for the toxin itself.
Cyanobacterial neurotoxin aetokthonotoxin (AETX), a peculiar pentabrominated biindole alkaloid implicated in fatal Vacuolar Myelinopathy. This neurodegenerative disease was first recorded in 1994 during an outbreak of bald-eagle poisonings at De Gray Lake in Arkansas, USA. AETX was experimentally confirmed to be produced by the true branching heterocytous cyanobacterium Aetokthonos hydrillicola. The production of AETX is dependent on bromide (Br−) availability, and likely linked to its hyper-accumulation by the host plan. Thus regular monitoring of A. hydrillicola (accompanied by assessment of Br− and AETX levels) is highly advisable to predict the possible threat of further VM outbreaks.
The cyanobacterial AetA gene which encodes the unique FAD-dependent halogenase involved in the pathway for AETX synthesis has been adapted to develop a -aetokthonotoxin specific quantitative PCR (qPCR) assay.
Real time qPCR kit for AetA gene
For screening aetokthonotoxin gene cluster
Use in combination with Attogene Algae DNA isolation kit
