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    Sigma GeneElute total RNA extraction from fungal tissue

    ALEXANDER J BRADSHAW

    Published: 2023-03-07 DOI: 10.17504/protocols.io.14egn7znyv5d/v1
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    Abstract

    RNA extraction from fungal tissue using the Sigma GeneElute total RNA kit.

    Steps

    Tissue and workspace preparation

    1.

    ALL WORK MUST BE DONE IN THE STERILE HOOD THAT HAS BEEN CLEANED FOR RNA WORK

    REGULARLY CHNAGE GLOVES AND WASH HANDS WITH RNASE TO AVOID DEGREDATION

    MAKE SURE ALL PIPETORS, TIPS, AND ANY OTHER EQUIPMENT ARE IN THE HOOD AND CLEANED WITH RNASE

    DO NOT MOVE ANYTHING IN OR OUT WITHOUT WASHING WITH RNASE

    Reagents that need to be made:

    Fresh, day of 70% etoh

    2.

    Flash Freeze tissue in Liquid Nitrogen (LN2).

    3.

    Grind Fungal Tissue to a fine powder with a mortar and pestle with LN2, be careful to not allow the tissue to thaw during this Process.

    3.1.

    At this point frozen ground tissue can be stored at -80C for later extraction.

    RNA extraction

    4.

    add 600ul of buffer RL to a 1.7ml eppendorf tube.

    5.

    Place no more than 50mg of ground tissue into the sample tube with buffer RL.

    6.

    Incubate for 15-30 minutes at room temperatureRoom temperature

    7.

    Centrifuge at maximum speed for 2 minutes

    Equipment

    ValueLabel
    CentrifugeNAME
    Benchtop CentrifugeTYPE
    EppendorfBRAND
    5405000441SKU
    Any benchtop centrifuge will sufficeSPECIFICATIONS
    8.

    Transfer the lysate to a new RNAse free 1.7ml tube.

    9.

    Add 1:1 volume (so 600ul) of freshly prepared 70% etoh

    10.

    Vortex for 10 seconds, or until homogenous

    11.

    Assemble a column with a waste tube from the GeneElute kit.

    12.

    Add 600ul of lysate/etoh solution to the assembled column

    13.

    Centrifuge at 6000G for 2 minuts

    14.

    If lysate is not completely passes, spin at an additional 14,000G for 1 minute

    15.

    Discard waste from waste tube, and repeat step 13 and 14 if more lysate/etoh exists.

    16.

    Place column into a new waste collection tube

    17.

    Add 400ul of wash solution A to column

    18.

    Centrifuges at max speed for 1.5 minutes

    19.

    discard waste from collection tube

    20.

    Repeat steps 17-19 two more times (for a total of 3x wash steps)

    21.

    Centrifuge Sample for a final 2 minute dry spin at max speed

    22.

    Place column in a clean eppendorf tube provided in the GeneElute kit.

    23.

    add 50ul of elution solution A

    24.

    Centrifuge at 200G for 2 minutes

    25.

    centrifuge at 14,000G for 1 minute

    26.

    If the entire 50ul has not eluted, then spin for an additional minute at 14,000G

    Quality control of RNA and storage

    27.

    Keep eluted samples on Ice, Prepare a bleach gel for RNA analysis

    28.

    BLEACH GEL:

    100ml TAE

    400ul concentrated bleach

    1g agarose

    Make sure to add bleach before microwaving.

    29.

    Load and run samples normally at 120V for ~20 minutes with a 100bp ladder.

    30.

    immediately store samples at -80C after loading gel.

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