Method for high-throughput detection of transgenic corn by virtue of micro-fluidic chip
A technology of transgenic corn and microfluidic chip, which is applied in the field of high-throughput screening, can solve the problems of cumbersome steps, high detection cost, and cumbersome operation
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[0099] Example 1.
[0100] (1) Microfluidic chip design
[0101] microfluidic chip Array Cards, TAC (Applied ThermoFisher Scientific Inc., Foster City, CA) is a real-time fluorescent quantitative PCR reaction plate with a 384-well plate structure. The injection-molded 384-well plate is divided into 16 columns, each two columns share a sample addition channel, and each channel contains 48 cavities with a volume of 1uL. The microwells are pre-embedded with DNA primer pairs designed for the detection target and the corresponding Probes (as in Table 1). All probes used in the experiments contained fluorescent labels, either FAM or VIC. The present invention is designed to simultaneously detect 6 samples and one negative control sample and one positive control sample.
[0102] In addition, the chip also includes detection primer probe sets for the maize endogenous genes hmgA and adh1.
[0103] Table 1: Specific Primer and Probe Sequences for Microfluidic Chips
[0104]...
Example Embodiment
[0118] Example 2. Microfluidic chip detection specificity and sensitivity test
[0119] (1) Specificity test
[0120] 18 transgenic standard products including T25, MON88017, MON87640, MON89034, MIR162, TC1507, NK603, MON863, MON810, GA21, DAS40278, BT176, BT11, 98140, 59122, 3272, MIR604, LY038, etc. Specificity of primers and probes. Non-GMO corn samples were also used for specific verification.
[0121] In the specificity test, the reaction conditions were: 50 °C for 2 min; 95 °C for 10 min; 95 °C for 15 sec, 60 °C for 1 min, 40 cycles.
[0122] (2) Sensitivity test
[0123] A series of different concentrations of 18 transgenic standards including T25, MON88017, MON87640, MON89034, MIR162, TC1507, NK603, MON863, MON810, GA21, DAS40278, BT176, BT11, 98140, 59122, 3272, MIR604, LY038, etc. were used for sensitivity test , to determine the minimum detection concentration of the TAC fluid chip.
[0124] (3) Test results
[0125] The test results show that the detection se...
Example Embodiment
[0130] Embodiment 3. Actual sample detection test
[0131] The method established in Example 1 was used to screen and detect corn strains on 16 samples including corn flour, corn kernels, puffed corn flour, and corn distiller's grains.
[0132] At the same time, the real-time fluorescent PCR method for transgene detection (SN / T1196-2012) was used to verify the results. All single real-time PCR reactions were performed on an AB7900HT real-time PCR instrument. Each response includes: Universal PCR Master Mix (2×) 12.5μL, upstream primer (10μmol / L) 0.5μL, downstream primer (10μmol / L) 0.5μL, probe (5μmol / L) 1μL, DNA template (40ng / μL~50ng / μL) ) 2μL, ROX DyeII 0.5μL, supplemented with ddH 2 0 to 25 μL. The reaction parameters of real-time fluorescent PCR were: pre-denaturation at 95°C for 30s; 95°C for 5s, 60°C for 34s, 40 cycles.
[0133] The detection results are shown in Table 3: it can be seen that the detection results of the TAC fluid chip method are completely consiste...
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