Oligonucleotide sequence as well as preparation method and application thereof
An oligonucleotide and oligonucleotide library technology, applied in biochemical equipment and methods, DNA preparation, microorganism-based methods, etc., can solve the problems of application limitations, false positives, and high technical requirements for preparation
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Embodiment 1
[0095] The preparation steps of the oligonucleotide sequence that can be used for the identification and detection of inactivated Vibrio harveyi in this embodiment mainly include:
[0096] 1. Synthesis of ssDNA oligonucleotide library for screening (5′-TCA GTC GCT TCG CCG TCT CCT TC----N35----GCA CAA GAG GGA GAC CCC AGA GGG-3′): by Shanghai Sheng Synthesized by Gongbio Engineering Technology Co., Ltd.
[0097] 2. SELEX screening: the specific steps are as follows:
[0098] 2.1 Preparation of inactivated Vibrio harveyi liquid
[0099] Wash Vibrio harveyi colonies cultured for 24 hours from the slope with normal saline, centrifuge at 6000rpm for 5 minutes, discard the supernatant, then add normal saline containing 6% formaldehyde and place in a water bath at 62.5°C for 1 hour, wash with normal saline three times after centrifugation , then suspend the inactivated bacterial pellet with 2×binding buffer, and store at 4°C.
[0100] 2.2 Combination with Vibrio
[0101] Take 4 μL...
Embodiment 2
[0143] This oligonucleotide sequence has the purpose of identifying and detecting inactivated Vibrio harveyi: the specific steps are as follows:
[0144] 1) Take the aquaculture water body infected with vibriosis, dissolve it in distilled water, inoculate it into a tryptone soybean broth (TSB) medium, and culture it on a shaker at 100 rpm at 30° C. for about 8 to 10 hours. Then take the bacterial liquid and centrifuge it, discard the supernatant culture liquid, then add physiological saline containing 6% formaldehyde and place it in a water bath at 62.5°C for 1 hour. The inactivated bacterial solution to be tested should be stored at 4°C. Take the inactivated bacterial liquid to be tested, and use the aptamer I9 (SEQ ID No.1) labeled with digoxin at the 5' end to detect the inactivated bacterial liquid to be tested according to the affinity determination method in step 3.3; Vibrio vibrio was used instead of the test bacteria solution, and it was also tested according to the a...
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