An antigen for detecting sperm antibody, its expression vector, its kit and detection method
A technology for expressing vectors and antibodies, which is applied in the field of reproductive medicine and immune applications, can solve the problems of high false positive rate, unreliable sensitivity and accuracy, and low positive rate, and achieve the effect of less specimen consumption and reliable test results
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Embodiment 1
[0057] An antigen used to detect sperm antibodies is a polypeptide encoded by the gene fragment of the PB functional region of the recombinant IZUMO gene, its amino acid sequence has the sequence shown in SEQ ID NO: 1, and its gene sequence has the sequence shown in SEQ ID NO: 2 .
Embodiment 2
[0059] A kind of expression vector used for detecting the antigen of sperm antibody in embodiment 1, the name of this expression vector is pET30a-IZUMO-His, the construction diagram of this expression vector is shown in the appendix figure 1 .
Embodiment 3
[0061] A method for constructing an expression vector for detecting an antigen of a sperm antibody according to embodiment 2, comprising the following steps:
[0062] Step 1, synthesize the gene fragment of the PB functional region of the recombinant IZUMO gene: obtain the PB gene sequence by gene synthesis and insert a His tag at the 3' end to obtain the gene fragment with the sequence shown in SEQ ID NO:1;
[0063] Step 2, amplification of the PB gene fragment: using the gene fragment obtained in Step 1 as a template, perform PCR amplification to obtain the above-mentioned expression vector for the antigen used for detecting sperm antibodies.
[0064] Wherein, in step 2, the conditions for PCR amplification are: pre-denaturation at 94°C for 5 minutes, denaturation at 94°C for 40 seconds, annealing at 60°C for 30 seconds, extension at 72°C for 45 seconds, 30 cycles, and extension at 72°C for 10 minutes. Wherein, the reaction system is shown in Table 1.
[0065] Table 1 React...
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