DNA sulfite conversion and purification method
A sulfite and centrifuge tube technology, applied in the field of transformation DNA purification, can solve the problems of difficult automatic operation, reduced extraction efficiency, cumbersome operation, etc., and achieves the effects of saving experimental operation time, improving extraction purity, and simple equipment and equipment.
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Embodiment 1
[0032] The comparison of different conversion temperatures of embodiment 1
[0033] Acquisition of methylated human genome: Use QIAGEN commercial blood human genome extraction kit to extract human genomic DNA, and then use NEB company's SssI methyltransferase for methylation treatment. The specific operation is carried out according to the manufacturer's instructions. Methylation After the treatment, the methylated DNA was purified using Tiangen’s PCR product purification kit, and the purified DNA was stored in a -20°C refrigerator for later use.
[0034] Sulphite conversion of the present invention and purification specific implementation steps:
[0035] 1. Add 20ul of DNA to be treated (methylated DNA or unmethylated DNA) in a 0.2ml centrifuge tube, and set up 3 copies.
[0036] 2. Add 85ul transformation solution to each portion, then add 35ul protection solution, and mix well.
[0037] 3. Place the three centrifuge tubes in a constant temperature metal bath at 70°C, 80°C...
Embodiment 2
[0054] Embodiment 2 Different purification reagents purify DNA effect contrast
[0055] Acquisition of methylated human genome: same as in Example 1.
[0056] Concrete implementation steps of sulfite conversion of the present invention:
[0057] 1. Add 60ul of DNA to be treated (methylated DNA or unmethylated DNA) into a 1.5ml centrifuge tube.
[0058] 2. Add 85ul transformation solution, then add 15ul protection solution, and mix well.
[0059] 3. Place the centrifuge tube in a constant temperature metal bath at 80°C for 60 minutes;
[0060] 4. Cool to room temperature;
[0061] The conversion solution is an aqueous solution containing 1.5M sodium bisulfite, 1.0M magnesium bisulfite, and 10mM diglyme, pH 5.5.
[0062] The protection solution is an aqueous solution containing 50mM hydroquinone, 100mM water-soluble vitamin C, and 10mM sodium bisulfite, with a pH of 5.0.
[0063] Concrete implementation steps of purification of the present invention:
[0064] 1. Add 600ul ...
Embodiment 3
[0086] Embodiment 3 The inventive method compares with Qiagen commercialization kit method
[0087] Acquisition of methylated human genome: same as in Example 1.
[0088] Sulphite conversion of the present invention and purification specific implementation steps:
[0089] 1. Add 20ul of DNA to be treated (methylated DNA or unmethylated DNA) into a 1.5ml centrifuge tube.
[0090] 2. Add 85ul transformation solution, then add 35ul protection solution, and mix well.
[0091] 3. Place the centrifuge tube in a constant temperature metal bath at 80°C for 60 minutes;
[0092] 4. Cool to room temperature;
[0093] 5. Add 300ul binding solution and 20ul magnetic bead solution to the 1.5ml centrifuge tube containing transformed DNA, mix well, and place at room temperature for 10min;
[0094] 6. Place the centrifuge tube on the magnetic stand for 2 minutes. After the magnetic beads are separated, discard the supernatant;
[0095] 7. Add 1ml of washing solution, mix the magnetic bead...
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