Sep 29, 2023

Public workspaceSanger Tree of Life HMW DNA Extraction: Automated Plant MagAttract v.1

DOI
dx.doi.org/10.17504/protocols.io.n2bvj3n1xlk5/v1
  • 1Tree of Life, Wellcome Sanger Institute, Hinxton, Cambridgeshire, CB10 1SA
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DOI: dx.doi.org/10.17504/protocols.io.n2bvj3n1xlk5/v1
Protocol Citation: Edel Sheerin, Filipa Sampaio, graeme oatley, Michelle Strickland, Maja Todorovic, Caroline Howard 2023. Sanger Tree of Life HMW DNA Extraction: Automated Plant MagAttract v.1. protocols.io https://dx.doi.org/10.17504/protocols.io.n2bvj3n1xlk5/v1
License: This is an open access protocol distributed under the terms of the Creative Commons Attribution License,  which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Protocol status: Working
We use this protocol and it's working
Created: September 05, 2023
Last Modified: September 29, 2023
Protocol Integer ID: 87387
Keywords: HMW DNA extraction, magnetic bead extraction, MagAttract, automated DNA extraction, KingFisher, plant DNA extraction, reference genome, long read sequencing
Funders Acknowledgement:
Wellcome Trust
Grant ID: 218328
Wellcome Trust
Grant ID: 206194
Gordon and Betty Moore Foundation
Grant ID: GBMF8897
Abstract
This protocol describes the automated extraction of HMW DNA from cryogenically disrupted plant and fungi tissue samples intended for long-read sequencing. It employs the Qiagen MagAttract HMW DNA extraction kit and the Thermo Fisher KingFisher™ Apex. This process is effective for a wide variety of plant species covered by the Tree of Life Programme. The output of this protocol is HMW DNA, which depending upon yield and genome size of the species, can be directed towards either HMW DNA Pooling or HMW DNA Fragmentation: Diagenode Megaruptor®3 for LI HiFi. This protocol was adapted from Sanger Tree of Life HMW DNA Extraction: Manual Plant MagAttract v.1 to include automation for a higher throughput of samples, and was updated to Sanger Tree of Life HMW DNA Extraction: Automated Plant MagAttract v.2 to improve sample lysis.


Acronyms
HMW: high molecular weight
SPRI: solid-phase reversible immobilisation
HiFi: high fidelity
Guidelines
  • For the lysis buffer master mix, prepare enough for n+1 samples to allow for pipetting errors.
  • Keep samples on dry ice to maintain temperature and prevent nucleic acid degradation until the lysis buffer is ready to be added to them.
  • An experienced operator can expect to comfortably process up to 32 samples, with approximately 2–3 hours handling time over a start to finish period of 4–5 hours. This estimation includes the utilisation of the KingFisher™ Apex and excludes subsequent QC checks.


Additional Notes:
  • FluidX tubes are used throughout the Tree of Life programme in order to track samples, therefore rather than the microcentrifuge tubes which have been mentioned in this protocol for DNA storage, all routine DNA extracts are stored in FluidX tubes.
  • Both the KingFisher™ Apex protocol script and the KFX.file have been made available for this protocol – the KFX.file requires ‘BindIx software for KingFisher Apex’ to allow the KingFisher™ Apex protocol to be viewed on a PC or laptop. Alternatively, the file can be transferred directly onto a KingFisher™ Apex instrument using a USB flash drive.
Materials
  • 1.5 mL DNA Lo-Bind microcentrifuge tubes (Eppendorf Cat. no. 0030 108.051)
  • 2 mL DNA Lo-Bind microcentrifuge tubes (Eppendorf Cat. no. 0030 108.078)
  • Thermo Fisher KingFisher™ 96-well Deep-well plates (Thermo Fisher Cat. no. 95040450)
  • Thermo Fisher KingFisher™ 96 Tip Comb (Thermo Fisher Cat. no. 97002570)
  • Qiagen MagAttract HMW DNA extraction kit (Qiagen Cat. no. 67563)
  • Dry ice
  • 1x phosphate-buffered saline (PBS)
  • 100% absolute ethanol
  • 15 mL or 50 mL centrifuge tubes

Equipment:
  • Pipettes for 0.5 to 1000 μL and filtered tips
  • Wide-bore tips (200 μL and 1000 μL, filtered if available)
  • Thermo Fisher KingFisher™ Apex instrument (Cat. no: 5400930)
  • Eppendorf ThermoMixer C (Cat. no. 5382000031) (or similar)
  • Eppendorf SmartBlock 2.0 mL (Cat. no. 5362000035)
  • Vortexer (Vortex Genie™ 2 SI-0266)
  • Mini centrifuge (Cat. no. SS-6050)
  • DynaMag™-2 magnetic rack (Cat. no. 12321D)
  • Timer


KingFisher™ Apex DNA Extraction Protocol Script:

KFX file: Download Qiagen MagAttract Standard.kfxQiagen MagAttract Standard.kfx2KB

  1. Pick Up Tip - Tip Plate
  2. DNA Binding - Sample Plate Pre-collect beads: Off Release beads: Off Heating & Cooling: Off Mixing 1# 00:05:00 Fast Postmix: Off Collect beads: On 5 Count 2 Seconds
  3. Collect Beads 1 - Sample Plate Collect beads: Count 5 Collect time: 1 Second
  4. Wash 1 - MW1 Wash 1 Plate Pre-collect beads: Off Release beads: On 00:00:10 Bottom mix Heating & Cooling: Off Mixing 1# 00:01:00 Fast Postmix: Off Collect beads: On 5 Count 1 Second
  5. Collect Beads 2 - MW1 Wash 1 Plate Collect beads: Count 5 Collect time: 1 Second
  6. Wash 2 - MW1 Wash 2 Plate Pre-collect beads: Off Release beads: On 00:00:10 Bottom mix Heating & Cooling: Off Mixing 1# 00:01:00 Fast Postmix: Off Collect beads: On 5 Count 1 Second
  7. Collect Beads 3 - MW1 Wash 2 Plate Collect beads: Count 5 Collect time: 1 Second
  8. Wash 3 - PE Wash 1 Plate Pre-collect beads: Off Release beads: On 00:00:10 Bottom mix Heating & Cooling: Off Mixing 1# 00:01:00 Fast Postmix: Off Collect beads: On 5 Count 1 Second
  9. Collect Bead 4 - PE Wash 1 Plate Collect beads: Count 5 Collect time: 1 Second
  10. Wash 4 - PE Wash 2 Plate Pre-collect beads: Off Release beads: On 00:00:10 Bottom mix Heating & Cooling: Off Mixing 1# 00:01:00 Fast Postmix: Off Collect beads: On 5 Count 1 Second
  11. Collect Bead 5 - PE Wash 2 Plate Collect beads: Count 5 Collect time: 1 Second
  12. Water Rinse - NFW Plate Pre-collect beads: Off Release beads: Off Heating & Cooling: Off Mixing 1# 00:00:00 Postmix: Off Collect beads: On 5 Count 1 Second
  13. Dry - NFW Plate Duration: 00:01:00 Dry Type: Above Well
  14. Elute 1 - Elution Plate 1 Plate Pre-collect beads: Off Release beads: On 00:00:00 Heating & Cooling: On 25°C Pre-heat: Off Mixing 1# 00:01:00 Paused Looping: 1 2# 00:05:00 Slow Tip Position: Above Well Postmix: Off Collect beads: On 3 Count 1 Seconds
  15. Elute 2 - Elution Plate 2 Plate Pre-collect beads: Off Release beads: On 00:00:00 Heating & Cooling: On 25°C Pre-heat: Off Mixing 1# 00:01:00 Paused Looping: 1 2# 00:05:00 Slow Tip Position: Above Well Postmix: Off Collect beads: On 3 Count 1 Seconds
  16. Leave Tip - NFW Plate


Protocol PDF: Download Sanger Tree of Life HMW DNA Extraction_ Automated Plant MagAttract v.1.pdfSanger Tree of Life HMW DNA Extraction_ Automated Plant MagAttract v.1.pdf88KB

Safety warnings
  • The operator must wear a lab coat, powder-free nitrile gloves and safety specs to perform the laboratory procedures in this protocol. Cotton glove liners are strongly recommended when handling the samples on dry ice.
  • Waste needs to be collected in a suitable container (e.g. plastic screw-top jar or Biobin) and disposed of in accordance with local regulations.
  • Liquid waste needs to be collected in a suitable container (e.g. glass screw-top jar) and disposed of in accordance with local regulations.
  • Do not open the door of the KingFisher™ Apex instrument whilst it is in operation.
Before start
Add 100% ethanol to MW1 and PE wash buffers as per manufacturer’s instructions.
Sample lysis
Sample lysis
Prepare a lysis buffer master mix:
ReagentVolume per sample
Phosphate-buffered saline (PBS)200 µL
Proteinase K20 µL
RNase A4 µL
Buffer AL150 µL

Set a heat block to 50 °C.
Transfer 50 mg of cryogenically homogenised tissue from each sample to 2 mL microcentrifuge tubes and place on dry ice to keep the samples frozen.
Add 374 µL of the lysis buffer master mix to each sample, then homogenise sample and mastermix by gently pipetting 10 times with a wide-bore pipette tip.

Centrifuge tube briefly to collect, then incubate on the heat block at 50 °C for 2 hours.
Loading and Running the KingFisher™ Apex
Loading and Running the KingFisher™ Apex
While samples are lysing, label nine 1 mL 96-well deep-well KingFisher™ plates and fill the number of wells required for the number of samples in each plate as follows:
PlateReagent(s) required
Tip plate96-well tip comb (no reagent)
Elution 2 200 µL Buffer AE
Elution 1 200 µL Buffer AE
NFW Wash 500 µL Nuclease-free water
PE Wash 2700 µL Buffer PE
PE Wash 1700 µL Buffer PE
MW1 Wash 2700 µL Buffer MW1
MW1 Wash 1700 µL Buffer MW1
Sample plate15 µL Suspension G magnetic beads 280 µL Buffer MB

Once samples have completed lysing, remove sample tubes from the heat block and briefly centrifuge to spin down.
Using a wide-bore pipette tip, set the volume to 380 µL, transfer lysate from the sample tubes to individual wells in the sample plate, taking care not to transfer large pieces of debris if possible.
Select the required protocol in the protocol list on the KingFisher™ Apex (details in KingFisher™ Apex DNA Extraction Protocol Script/attached KFX file in the Materials section) and select using the play button.
Load the filled plates onto the instrument following the instructions provided on screen.
Prior to loading the “Sample Plate”, the instrument will prompt to remove the “Tip Plate”. Once the final plate is loaded, the protocol will automatically begin; this takes approximately 50 minutes.
Once the protocol has completed, follow the on-screen instructions to remove plates from the instrument.
Inspect the elution plates for any magnetic beads in the wells. In the rare instance of magnetic beads remaining in the eluate (possible in viscous samples), these samples will need to be transferred to a 1.5 mL microcentrifuge tube and placed on a magnetic rack. Allow around 5 minutes for the beads to migrate and take the clear eluate containing the DNA using a wide-bore pipette tip.
Using a 200 µL multi-channel pipette and wide-bore tips, pipette eluates from the elution plate into microcentrifuge tubes, pipette mix with wide-bore tips to fully homogenise DNA in the eluate.
Perform required QC and then store the DNA at 4 °C.
Protocol references
MagAttract HMW DNA Handbook: MagAttract HMW DNA Handbook - QIAGEN