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    TELEvir Field Protocol

    Anna S Fomsgaard

    Published: 2023-06-29 DOI: 10.17504/protocols.io.n2bvj694xlk5/v1
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    Disclaimer

    This protocol was prepared for a workshop held the 23-24 June 2022 at Statens Serum Institut, Denmark. Here 25 TELEVIR partners from 10 European countries participated to train in the usage of a field-deployable point-of-incidence toolbox to identify emgerging virus threats. The protocol was used to detec SARS-CoV-2 and Human Papillomavirus a RNA and DNA virus detection test-of-concept.

    Abstract

    The TELE-Vir project key aim is to develop a fast point-of-incidence (poi) toolbox for identification and characterisation of emerging virus threats for humans and/or domestic and wildlife animals.

    Presented here is a protocol including sample pretreatment, NA extraction and random amplification for metagenomic virus detection using the MinION device (Oxford Nanopore Technologies)

    Steps

    Pretreatment

    1.

    Equipment

    ValueLabel
    BD Disposable Syringe with Luer-Lok Tip (5ml)NAME
    SyringeTYPE
    Becton DickinsonBRAND
    309649SKU
    http://www.bd.com/en-usLINK

    Equipment

    ValueLabel
    Syringe Filter pore size 0.2 μmNAME
    FilterTYPE
    MinisartBRAND
    16532SKU
    Polyethersulfone (PES), Pore Size 0.22 µm, Ethylene Oxide, Female Luer Lock, Male Luer Lock, Pack Size 50SPECIFICATIONS

    400µL

    50µL

    50µL

    0h 15m 0s

    Note
    If 400 µL sample is not available, downscale the reagents to fit the lower sample volume.

    2.

    Add 500µL (or equivalent to 1 ml sample material in total)

    3.

    Poor the diluted sample into the lid of the Syringe Filter (Minsart). The filter can be placed on a sterile surface meanwhile e.g. the Syringe Filter paper lid (inner side).

    4.

    Suck in air corresponding to app 1 ml in a 5 ml syringe

    5.

    Extract the 1 ml sample material from the petri dish to the 5 ml syringe

    6.

    Attach the 0,22 µM Minisart syringe filter to the 5 ml syringe with Luer-Lok

    7.

    Filter the sample and air directly into a 4.5 ml cryotube containing 1 ml MPLB-buffer. Put lid on, mix by turning tube.

    Inactivation

    8.

    Incubate

    0h 20m 0s for viral inactivation

    Citation
    Vinner L, Fomsgaard A 2007 Inactivation of orthopoxvirus for diagnostic PCR analysis. Journal of virological methods

    Citation
    Rosenstierne MW, Jensen CE, Fomsgaard A 2018 Rapid, Safe, and Simple Manual Bedside Nucleic Acid Extraction for the Detection of Virus in Whole Blood Samples. Journal of visualized experiments : JoVE http://doi.org/10.3791/58001

    Extraction

    9.

    Kit used for hand held NA extraction:

    Equipment

    ValueLabel
    4.5 ml cryotubeNAME
    tubeTYPE
    Thermo Fisher ScientificBRAND
    363452SKU

    Equipment

    ValueLabel
    3.6 ml cryotubeNAME
    TubeTYPE
    Thermo Fisher ScientificBRAND
    379189SKU

    Cylinder magnet

    A rubber band to attach the magnet to a tube.

    A 50 ml Nunc tube or similar to pour excess solutions into for disposing.

    Following the protocol by:

    Citation
    Rosenstierne MW, Jensen CE, Fomsgaard A 2018 Rapid, Safe, and Simple Manual Bedside Nucleic Acid Extraction for the Detection of Virus in Whole Blood Samples. Journal of visualized experiments : JoVE http://doi.org/10.3791/58001

    10.

    Per X number of samples, aliquot in cryotubes or Eppendorf tubes

    960µL Magnetic Glass Particles (MGPs) in an Eppendorf tube4mL Wash buffer I in a 4.5 ml cryotub1.5mL

    Wash buffer II in an Eppendorf tub3mL

    Wash buffer III in a 3.6 ml cryotu100µLe

    Elution buffer in an Eppendorf tube

    Prepare one sample at the time.

    Approximate time 0h 10m 0s

    11.

    Add 960 µl MGPs to 2 ml solution of sample and MPLB-buffer

    12.

    Put lid on and turn tube in hand gently until well mixed

    13.

    Attach magnet and trap beads.

    14.

    Pour solution into trash tube. The MGPs should stay behind trapped on the side of the tube.

    15.

    Pour Wash buffer I in the sample tube

    16.

    Put a lid on, remove magnet and turn the tube in hand gently until well mixed

    17.

    Attach magnet and trap beads.

    18.

    Pour solution into trash tube. The MGPs should stay behind trapped on the side of the tube.

    19.

    Pour Wash buffer II in the sample tube

    20.

    Put a lid on, remove magnet and turn the tube in hand gently until well mixed

    21.

    Attach magnet and trap beads.

    22.

    Pour solution into trash tube. The MGPs should stay behind trapped on the side of the tube.

    23.

    Pour Wash buffer III in the sample tube

    24.

    Put a lid on, remove magnet and turn the tube in hand gently until well mixed

    25.

    Attach magnet and trap beads.

    26.

    Pour solution into trash tube. The MGPs should stay behind trapped on the side of the tube.

    27.

    Pour Elution buffer in the sample tube

    28.

    Put a lid on, remove magnet and turn the gently until beads are eluted.

    28.

    Transfer 10µL to a 0.2 ml PCR tube.

    WTA & WGA

    29.
    29.

    Transfer 10µL to 2 x 0.2 ml PCR tube

    Whole Transcriptome and Genome Amplification

    30.

    Equipment to enable portability

    • A MiniPCR to run isothermal incubations

    • A powerbank that can provide 20V. Use one to power the miniPCR and another to power the MinION for approximately 5 hours. Use brand of choice.

    • A salad swing as a hand driven centrifuge. Use brand of choice.

    • A coolbox for reagents and cooling samples. Use brand of choice.

    Equipment

    ValueLabel
    All-in1 Laptop Powerbank 24000NAME
    Power BankTYPE
    SanbergBRAND
    420-57SKU
    Any powerbank that can produce 20V is acceptable. Have 2-3 to run the MiniPCR and the MinIONSPECIFICATIONS

    Equipment

    ValueLabel
    miniPCR® mini8 thermal cyclerNAME
    Thermal cyclerTYPE
    miniPCR®BRAND
    mini8SKU

    Equipment

    ValueLabel
    A Salad Spinner CentrifugeNAME
    CentrifugeTYPE
    undefinedBRAND
    undefinedSKU

    Kit used for WTA and WGA

    Quantiscript RT Enzyme Mix, Ligase Mix, and REPLI-g SensiPhi DNA Polymerase should be thawed on ice.

    All other components can be thawed at room temperature (15–25°C)

    31.

    The two aliquots of same sample enables uniform whole genome amplification (WGA) and whole transcriptome amplification (WTA) in parallel reactions.

    32.

    Cleanup for WTA

    Add 2µL to PCR tube with 10 µl eluted sample material

    0h 10m 0s 42°C on MiniPCR

    33.

    Repair (WGA) and Reverse Transcription (WTA)

    33.1.

    For WGA , mix following and add 10µL to sample

    AB
    RT/Polymerase Buffer4
    gDNA Wipeout buffer2
    H2O sc1
    Random primer1
    Random Hex-P primer (20µM)1
    WGA Ready Enzym1
    Total10

    This modified protocol uses 5'-phosphorylated random hexamers (P-N6) instead of kit provided oligo-dT primers according to Rosenstierne et al (2014).

    Citation
    Rosenstierne MW, McLoughlin KS, Olesen ML, Papa A, Gardner SN, Engler O, Plumet S, Mirazimi A, Weidmann M, Niedrig M, Fomsgaard A, Erlandsson L 2014 The microbial detection array for detection of emerging viruses in clinical samples--a useful panmicrobial diagnostic tool. PloS one http://doi.org/10.1371/journal.pone.0100813

    33.2.

    For WTA , mix following and add 8µL to sample

    AB
    RT/Polymerase Buffer4
    H2O sc1
    Random primer1
    Random Hex-P primer (20µM)1
    Quantiscript RT Enzym Mix1
    Total8
    33.3.

    Incubate

    1h 0m 0s 42°C On MiniPCR

    Afterwards immediatly

    0h 3m 0s 95°C on MiniPCR

    34.

    Ligation

    Mix following and add 10µL to each tube

    AB
    Ligation buffer8
    Ligase Mix2
    Total10

    Incubate

    0h 30m 0s 24°C

    0h 5m 0s 95°C

    Hold at 4°C

    35.

    Amplification

    Mix following and add 30µL to each tube

    AB
    Repli-g reaction buffer29
    Repli-g SensiPhi DNA polymerase1
    Total30

    Incubate

    2h 0m 0s 30°C

    0h 5m 0s 65°C

    Hold at 4°C

    36.

    For library preparation use amplified material without MGPs.

    Library Preparation

    37.

    Multiple rapid library preparation kits are available through Oxford Nanopore Technology.

    For Workshop we use.

    Equipment

    ValueLabel
    MinION Mk1CNAME
    SequencerTYPE
    Oxford Nanopore TechnologyBRAND
    MIN-101CSKU

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