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Protocol for GenomePlex Whole Genome Amplification ,,,from Buccal Swab

Application Guide

I. Description
II. Product Components
III. Materials to be Supplied by the User
IV. Protocol for Extraction of DNA from Buccal Swab
V. Protocol for GenomePlex Whole Genome Amplification from Buccal Swab
VI. Quantification of Amplified Products
VII. Purification of Amplified Products
Appendix
Application Data
References
Contact Information

Application Guide

I. Description
This protocol provides a simple and convenient method to isolate, amplify, and purify genomic DNA from buccal swabs. Samples that result in low quantity genomic DNA can hinder the researcher's ability to perform downstream analysis. The protocol presents a simple and accurate tool to immortalize DNA for downstream applications. This method describes the means for amplifying nanogram amounts of starting genomic DNA with little or no detectable bias resulting in microgram quantities. The protocol is completed using the GenElute Mammalian Genomic DNA MiniPrep Kit, GenomePlex WGA kit, and GenElute PCR Clean-up Kit.

GenomePlex is a Whole Genome Amplification (WGA) method that allows the researcher to generate a representative, approximate 1000-fold amplification of genomic DNA. The kit utilizes a proprietary amplification technology based upon random fragmentation of genomic DNA and conversion of the resulting small fragments to PCR-amplifiable OmniPlex Library molecules flanked by universal priming sites. The OmniPlex library is then PCR amplified using universal oligonucleotide primers and a limited number of cycles.

This technology maintains the genetic representation with conco rdance >99.8% in genotyping results from comparing genomic DNA and GenomePlex amplified DNA1. In addition to SNP genotyping, downstream applications also include performing TaqMan assays and BeadArray analysis.

II. Product Components

  • GenElute Mammalian Genomic DNA Miniprep Kit (G1N10)
  • GenomePlex WGA kit (WGA1)
  • GenElute PCR Clean-Up Kit (NA1020)

III. Materials to be Supplied by the User

  • Buccal swab
  • 1.5 ml microcentrifuge tubes for lysis
  • Microcentrifuge (with rotor for 2ml tubes)
  • Ethanol (absolute) Product Code E7023
  • Molecular Biology Reagent Water, Product Code W4502
  • JumpStart Taq DNA Polymerase, Product Code D9307
  • 70 C water bath or heating block

IV. Protocol for Extraction of DNA from Buccal Swab

  • Performed with GenElute Mammalian Genomic DNA Miniprep (G1N10)
    1. Collected swabs were dried at room temperature for 15 minutes.
    2. Add 280 l of Lysis Solution T and 20 l of Proteinase K. Insert the swab and gently spin.
    3. Cap the tube and mix by vortexing.
    4. Incubate the sample at 55 C for 20 minutes with occasional vortexing.
    5. Add 200 l of Lysis Solution C and vortex thoroughly for 15 seconds.
    6. Incubate at 70 C for 10 minutes.
    7. Add 500 l of Column Preparation Solution to each GenElute Miniprep Binding Column (red o-ring) and centrifuge at 12,000 X g for 1 minute. Discard the flow-though liquid.
    8. Add 200 l of 95-100% ethanol to the lysate from step 6.
    9. Mix thoroughly by vortexing and add the entire contents of the tube into the binding column.
    10. Centrifuge at ≥ 6,500 X g for 1 minute.
    11. Discard the collection tube containing the flow through and place the binding column in a new 2 ml collection t ube.
    12. Add 500 l of Wash Solution (be sure to dilute with ethanol prior to first use) and centrifuge at ≥ 6,500 X g for 1 minute.
    13. Discard the collection tube containing the flow through and place the binding column in a new 2 ml collection tube.
    14. Add another 500 l of Wash Solution to the binding column and centrifuge at maximum speed (12,000 X g to 16,000 X g) for 3 minutes to dry the binding column.
    15. Pipette 200 l of Elution Solution onto the binding column and centrifuge for 1 minute at ≥ 6,500 X g.
    16. Store the eluted DNA at - 20 C.

V. Protocol for GenomePlex Whole Genome Amplification from Buccal Swab

  • Performed with GenomePlex Whole Genome Amplification Kit (WGA1)

    Fragmentation

    1. Prepare DNA solution of 1 ng/l from buccal swab extraction protocol described above.
    2. Add 1 l of 10X Fragmentation Buffer to 10 l DNA (1 ng/l) in a PCR tube.
    3. Place the tube in a thermal cycler at 95 C for EXACTLY 4 minutes. Note, the incubation is time sensitive and any deviation may alter results.
    4. Immediately cool the sample on ice and centrifuge briefly.

    Library Preparation

    1. Add 2 l of 1x Library Preparation Buffer.
    2. Add 1 l of Library Stabilization Solution.
    3. Mix thoroughly and place in thermal cycler at 95 C for 2 minutes.
    4. Cool the sample on ice and centrifuge briefly.
    5. Add 1 l Library Preparation Enzyme, mix thoroughly, and centrifuge briefly.
    6. Place sample in thermal cycler and incubate as follows:
      • 16 C for 20 minutes
      • 24 C for 20 minutes
      • 37 C for 20 minutes
      • 75 C for 5 minutes
      • 4 C hold
    7. Remove samples from thermal cycler and centrifuge briefly. Samples may be amplified immediately or stored at - 20 C up to three days.

    Amplification

    1. Add the following reagents to the entire 15 ml reaction:
      • 7.5 l 10x Amplification Master Mix
      • 47.5 l Nuclease Free Water
      • 5.0 l JumpStart Taq DNA Polymerase (12.5 units)
    2. Mix thoroughly, centrifuge briefly, and begin thermocycling:

      • Initial Denaturation 95 C for 3 minutes
        Perform 14 cycles as follows:
      • Denature 95 C for 15 seconds
      • Anneal/Extend 65 C for 5 minutes
    3. After cycling is complete, maintain the reactions at 4 C or store at -20 C until ready for analysis or purification.

VI. Quantification of Amplified Products
The amount of GenomePlex Whole Genome Amplification Kit products can be detected with or without purification. For the highest quality samples of DNA we strongly recommend cleaning up the samples after amplification. The amplified products can be measured with the PicoGreen dsDNA Quantitation Assay (Molecular Probes Inc. Product # P-7589). Another method of detecting the amplified products is spectrophotometric absorption (OD260) on a NanoDrop instrument.

VII. Purification of Amplified Products

  • Performed with GenElute PCR Clean-Up Kit (NA1020)

    1. Insert a GenElute Miniprep Binding Column (with a blue o-ring) into a provided collection tube, if not already assembled. Add 0.5 ml of the Column Preparation Solution to each miniprep column and centrifuge at 12,000 x g for 30 seconds to 1 minute. Discard the eluate.

      Note: The Column Preparation Solution maximizes binding of the DNA to the membrane resulting in more consistent yields.

    2. Add 5 volumes of Binding Solution to 1 volume of the PCR reaction and mix. For example, add 500 l of Binding Solution to 100 l of the PCR reaction. Transfer the solution into the binding column. Centrifuge the column at maximum speed (12,000-16,000 X g) for 1 minute. Discard the eluate, but retain the collection tube.

    3. Replace the binding column into the collection tube. Apply 0.5 ml of diluted Wash Solution to the column and centrifuge at maximum speed for 1 minute. Discard the eluate, but retain the collection tube.

      Note: Be sure to add ethanol to the Wash Solution Concentrate prior to first time use. See Preparation Instructions.

    4. Replace the column into the collection tube. Centrifuge the column at maximum speed for 2 minutes, without any additional wash solution, to remove excess ethanol. Discard any residual eluate as well as the collection tube.

    5. Transfer the column to a fresh 2 ml collection tube. Apply 50 l of Elution Solution or water to the center of each column. Incubate at room temperature for 1 minute.

      Note: When eluting with water, make sure that the pH of the water is between 5.5 and 8.5. Elution may also be performed using the Elution Solution diluted 10-fold with water.

    6. To elute the DNA, centrifuge the column at maximum speed for 1 minute. The PCR amplification product is now present in the eluate and is ready for immediate use or storage at -20 C.

Appendix

Application Data

Lanes 1, 7: 1kb ladder
Lane 2: blood
Lane 3: plant
Lane 4: buccal swab
Lane 5: soil
Lane 6: positive control

References
1. Barker, D. L., et al. Two methods of whole-genome amplification enable accurate genotyping across a 2320-SNP linkage panel. Genomic Research, 14, 901-7 (2004).

2. Gribble, S., et al. Chromosome paints from single cop ies of chromosomes. Chromosome Research, 12, 143-51 (2004).

3. Thorstenson, Y. R., et al. An Automated Hydrodynamic Process for Controlled, Unbiased DNA Shearing. Genome Research, 8, 848-855 (1998).

Contact Information
For technical assistance please contact:
Technical Service
(800) 325-5832
www.techserv@sial.com

To learn more about GenomePlex WGA technology visit: www.sigmaaldrich.com

GenomePlex is a registered trademark of Rubicon Genomics, Inc.
GenomePlex WGA technology patent pending.
GenElute and Jumpstart are trademarks of Sigma-Aldrich, Inc.
Nanodrop is a registered trademark of Nanodrop Technologies, Inc.
PicoGreen is a trademark of Molecular Probes, Inc.
BeadArray is a Trademark of Illumina, Inc.
TaqMan is a registered trademark of Roche Molecular Systems
Taq antibody licensed for in vitro research use under U.S. Patent No. 5,338,671 and 5,587,287, and corresponding patents in other countries.
This product is sold under license from Roche Molecular Systems, Inc. and Applied Biosystems.

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