- Materials
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- Flow Cell Wash Kit (EXP-WSH004) or Flow Cell Wash Kit XL (EXP-WSH004-XL)
- Flow cell priming reagents available in your sequencing kit or in the following kits:
- Sequencing Auxiliary Vials V14 (EXP-AUX003)
- Flow Cell Priming Kit (EXP-FLP004)
- Equipment
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- P1000 pipette and tips
- P20 pipette and tips
- Ice bucket with ice
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Thaw the Sequencing Buffer (SB), Library Beads (LIB) or Library Solution (LIS, if using), Flow Cell Tether (FCT) and Flow Cell Flush (FCF) at room temperature before mixing by vortexing. Then spin down and store on ice.
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Prepare the flow cell priming mix in a suitable tube for the number of flow cells to flush. Once combined, mix well by briefly vortexing.
Reagents Volume per flow cell Flow Cell Flush (FCF) 1,170 µl Flow Cell Tether (FCT) 30 µl Total volume 1,200 µl -
Slide the inlet port cover clockwise to open.
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After opening the inlet port, check for a small air bubble under the cover. Draw back a small volume to remove any bubbles:
- Set a P1000 pipette to 200 µl
- Insert the tip into the inlet port
- Turn the wheel until the dial shows 220-230 µl, or until you can see a small volume of buffer entering the pipette tip.
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Slowly load 500 µl of the priming mix into the inlet port, as follows:
- Using a P1000 pipette, take 500 µl of the priming mix
- Insert the pipette tip into the priming port, ensuring there are no bubbles in the tip
- Slowly twist the pipette wheel down to load the flow cell (if possible with your pipette) or push down the plunger very slowly, leaving a small volume of buffer in the pipette tip.
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Close the inlet port and wait five minutes.
During this time, prepare the library for loading using the next steps in the protocol.
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Thoroughly mix the contents of the Library Beads (LIB) by pipetting.
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In a new tube, prepare the library for loading according to the "Priming and loading the PromethION Flow Cell" section of the suitable protocol to ensure you are using the correct reagents and volumes.
For Kit 14 chemistry:
Reagent Volume per flow cell Sequencing Buffer (SB) 100 µl Library Beads (LIB) thoroughly mixed before use, or Library Solution (LIS) 68 µl DNA library 32 µl Total 200 µl -
Remove the waste buffer, as follows:
- Ensure the inlet port is closed.
- Insert a P1000 pipette into a waste port and remove the waste buffer
Note: As the inlet port is closed, no fluid should leave the sensor array area.
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Slide the inlet port cover clockwise to open.
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After opening the inlet port, check for a small air bubble under the cover. Draw back a small volume to remove any air bubbles:
- Set a P1000 pipette to 200 µl.
- For the first flow cell, insert the tip into the inlet port.
- Turn the wheel until the dial shows 220-230 µl, or until you can see a small volume of buffer entering the pipette tip.
- Repeat for the remaining flow cells.
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Slowly load 500 µl of the priming mix into the inlet port, as follows:
- Using a P1000 pipette, take 500 µl of the priming mix
- Insert the pipette tip into the priming port, ensuring there are no bubbles in the tip
- Slowly twist the pipette wheel down to load the flow cell (if possible with your pipette) or push down the plunger very slowly, leaving a small volume of buffer in the pipette tip.
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Remove waste buffer, as follows:
- Close the inlet port.
- Insert a P1000 pipette into a waste port and remove the waste buffer.
Note: As both the inlet port is closed, no fluid should leave the sensor array area.
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Slide the inlet port cover clockwise to open.
-
After opening the inlet port, check for a small air bubble under the cover. Draw back a small volume to remove any bubbles:
- Set a P1000 pipette to 200 µl
- Insert the tip into the inlet port
- Turn the wheel until the dial shows 220-230 µl, or until you can see a small volume of buffer entering the pipette tip.
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Mix the prepared library gently by pipetting up and down just prior to loading.
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Load 200 µl of library into the inlet port using a P1000 pipette.
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Close the valve to seal the inlet port.
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If the light shield has been removed from the flow cell, install the light shield as follows:
- Align the inlet port cut out of the light shield with the inlet port cover on the flow cell. The leading edge of the light shield should sit above the flow cell ID.
- Firmly press the light shield around the inlet port cover. The inlet port clip will click into place underneath the inlet port cover.
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Close the PromethION lid when ready to start a sequencing run on MinKNOW.
Wait a minimum of 10 minutes after loading the flow cells onto the PromethION before initiating any experiments. This will help to increase the sequencing output.