Method for high-efficiency extraction of extracellular DNA in sediments
A sediment and high-efficiency technology, applied in the fields of environmental science and bioengineering, to achieve the effect of strong practicability and high degree of reliability
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[0026] Example 1: Extraction of extracellular DNA from sediment samples;
[0027] Step 1: Construction of extracellular DNA internal standard gene;
[0028] Section 1.1: Construction of cloning vector of extracellular DNA internal standard gene;
[0029] The CESA9 gene in Arabidopsis thaliana was amplified by PCR and then gelatinized and recovered, 0.5-4μl PCR was gently mixed with 1μlpEASY-T1 cloning vector, and reacted at room temperature for 5 minutes. After the reaction, the centrifuge tube was placed on ice;
[0030] Section 1.2: Amplification of internal standard genes in extracellular DNA
[0031] Add the ligation product to 50μl of competent E.coli DH5α cells, heat shock in a 42℃ water bath for 30 seconds, and immediately place on ice for 2 minutes; add 250μl of LB medium equilibrated to room temperature, incubate at 200rpm and 37℃ for 1 hour; take 8μl 500mM IPTG and 40μl 20mg / ml X-gal were mixed, spread evenly on the prepared plate, and placed in a 37°C incubator for 30 minute...
Example Embodiment
[0046] Example 2: PCR testing the extraction efficiency of microbial extracellular DNA in sediments;
[0047] (1) Target gene primer sequence
[0048]
[0049] (2) Qualitative PCR reaction program
[0050]
[0051] (3) Fluorescent real-time quantitative PCR reaction
[0052]
[0053] (4) Qualitative PCR reaction system
[0054]
[0055] (5) Quantitative PCR reaction system
[0056]
[0057] Table 2: Detection of extraction efficiency of microbial extracellular DNA from sediment samples
[0058]
[0059] Using the method described in Example 2, the extraction efficiency of the microbial extracellular DNA in the sediment samples can be all higher than 44%, and the highest can reach 57%. Therefore, the present invention is suitable for extracting microbial extracellular DNA in sediment samples. In addition, the application scope of the present invention not only includes sediments, but also has high DNA quality and extraction efficiency for soil and other media.
[0060]
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