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DNA Biobank

DNA Biobank

Automated DNA Extraction and Normalization

Successfully building up a biobank requires many individual steps from sample collection, processing, storage and fast retrieval of specific samples when needed. The biobanking system described here fully automates DNA extraction from human blood samples (up to 3 mL), DNA normalization, and storage at/retrieval from -20°C. The automated biobanking methods result in a standardized process with highest accuracy and reproducibility. At the same time, the full chain of custody from the blood samples down to the normalized DNA samples in the storage system is recorded automatically. 

This biobanking system uses the Invitrogen GeneCatcher Midi kit with magnetic beads to extract DNA from primary blood samples. During loading of the primary samples, the barcodes of all samples are read and stored in the database.

DNA Binding

After preparing the extraction plates with 60 µL magnetic bead solution and 2.5 mL Lysis buffer, 1 mL of blood is added to each well. In order to increase final DNA amount, a total of 3 mL of each primary sample is distributed equally into 3 wells of the extraction plate. After initial lysis and removal of the supernatant, the samples are subjected to a protease digestion at 65°C in order to remove any protein that potentially binds DNA and thus could compromise DNA quality and yield. Using the CO-RE Grippers, the plates are moved between the heating/shaking positions (incubation steps) and the magnet positions where the beads are held back in the wells (pipetting steps). Using Hamilton’s Tip Cutter, the diameter of the opening of the standard tips can be flexibly enlarged for challenging pipetting steps during the complete process (removal of cell debris, pipetting of viscous solutions).

DNA Elution

After four subsequent washing steps, 250 µL elution buffer is added to the individual wells, the plates are lidded and incubated at 65°C with gentle shaking on the Hamilton Heater Shaker to elute the DNA from the magnetic beads. The eluates are then transferred into an intermediate deep-well plate, where the three aliquots of each primary sample are combined. An aliquot of each sample is subjected to an absorbance measurement at 260/280 nm (Biotek PowerWave) in order to calculate purity and amount of DNA.

DNA Normalization

Using the results of the absorbance measurement the final DNA concentration is adjusted to a user specified value in the final Matrix storage tubes. DNA from each primary sample is stored in two different tubes.

Sample Storage

The Matrix tube racks are then transported to the ASM Server via an integrated hand-off arm. Inside the ASM Server, the internal 1-D and 2-D barcode reader registers each individual tube before storing it in the ASM Store. This guarantees a complete chain of custody within the biobank from the blood samples up to the normalized DNA samples stored in one of the -20°C ASM Store modules.

Download the Biobanking Brochure

Hardware Requirements:

  • Microlab STARplus 
    • Hamilton Heater Shaker
    • Liquid Dispenser Trough 8
    • MFX Cooling Module
    • Tip Cutter Module
    • GeneCatcher™ Automation Magnet and various standard carriers for tips, tubes and plates
  • ASM System
  • FluidX DeCapper
  • Biotek PowerWave Spectrometer

 Labware Requirements:

  • High-volume CO-RE tips
  • 50 mL reagent container  
  • 24-well U-bottom DWP
  • 0.5 mL storage tubes
  • GeneCatcher™ Midi Kit
  • Sample tracking inside the biobank as chain of custody is recorded automatically
  • Standardized sample handling and higher quality results
  • High-throughput tube picking for labor intensive processes
  • Process up to 48 samples without user intervention
  • Process up to 96 samples per 8 hour shift
  • Modular capacity to grow with your needs