A method for detecting Babesia and its special kit

A technology of Babesia and Babesia diversiformis, which is applied in the biological field to achieve the effect of improving specificity and sensitivity

Inactive Publication Date: 2018-10-23
MICROBE EPIDEMIC DISEASE INST OF PLA MILITARY MEDICAL ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • A method for detecting Babesia and its special kit
  • A method for detecting Babesia and its special kit
  • A method for detecting Babesia and its special kit

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Experimental program
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Embodiment 1

[0046] The design of embodiment 1, primer and probe

[0047] 1. There are three main hypervariable regions in the 18s rRNA gene of Babesia, the first is located at the 100-200nt position from the 5' end, the second is located at the 550-660nt position, and the third is located at 1250nt -1300nt position. The difference between different species of Babesia is between 0.0% and 11.2%, and the corresponding position of the 18s rRNA gene of rodent and human origin is close to 30%.

[0048] According to the primer design principle, a section of 406bp gene region (SEQ ID No.1) (the sequence It is derived from Babesia divergens (Babesia divergens, sequence number GU057385 in GenBank) for further analysis, where the bold part is the variation region of different species of Babesia.

[0049] SEQ ID No.1:

[0050] 5’-AATTACCCAATCCTGACACAGGGAGGTAGTGACAAGAAATAACAATACAGGGCAATTGTCTTGTAATTGGAATGATGGTGATGTAAACCCTCACCAGAGTAACAATTGGAGGGCAAGTCTGGTGCCAGCAGCCGCGGTAATTCCAGCTCCAATAGCGTATATTAAACTTG...

Embodiment 2

[0059] Embodiment 2, common PCR amplification verification

[0060] 1. Synthesize the fragment shown in SEQ ID No.1 and insert it into the plasmid vector pMD18-T to obtain a recombinant plasmid, which is named pBabesi406. The recombinant plasmid pBabesi406 was sent for sequencing, and the result was correct.

[0061] Two, with the recombinant plasmid pBabesi406 of different gradient dilutions as template, with SEQ ID No.2 and SEQ ID No.3 (y=t / c, s=g / c, the equal concentration mixture of four kinds of primers) as primers, carry out Ordinary PCR amplification, each PCR amplification product is obtained, and the agarose gel electrophoresis result of each PCR amplification product is as follows: figure 1 shown.

[0062] figure 1 Among them, 1-5 are PCR amplification products; M is DNA marker.

[0063] figure 1 It shows that the target band of about 120bp can be obtained by PCR amplification, and the target band is sequenced, and the result is consistent with the sequence of S...

Embodiment 3

[0064] Embodiment 3, real-time fluorescent quantitative PCR verification

[0065] 1. Insert the DNA fragment shown in SEQ ID No.5 into pMD18-T to obtain a recombinant plasmid, which is named pBabesi116. The pBabesi116 was sent for sequencing, and the result was correct.

[0066] Two, according to the base number (2692+116=2808bp) of the recombinant plasmid pBabesi116, calculate the molecular weight (MW=2808×660=1853280Daltons), that is, 1mol=1.85328×10 6 g.

[0067] The actual nucleic acid concentration of pBabesi116 was measured and repeated three times. The results were 147, 133, and 127 (ng / uL) respectively, and the average value was 135.7 ng / μL, which was used as a standard.

[0068] Calculate standard copy number: (6.02x10 23 copy number / mole)x(1357x10 -10 g / μl) / (1.85328x10 6 g / mol)=4.4x10 10 copies / μL, dilute the standard in different gradients, and calculate the corresponding concentration at the same time, as shown in Table 1.

[0069] 3. PCR detection was perfo...

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Abstract

The invention discloses a method and a special kit thereof for detecting babesia. The invention discloses a group of DNA molecules which include DNA molecules as shown in (1)-(3): (1) a DNA molecule as shown in SEQ ID No.2; (2) a DNA molecule as shown in SEQ ID No.3; and (3) a DNA molecule as shown in SEQ ID No.4. The method disclosed by the invention, compared with morphological and immunofluorescent methods adopted in clinical field in the past, can greatly improve the sensitivity of detecting babesia, and the method has the characteristics of being rapid and convenient; and the method and the special kit thereof are suitable for basic hospitals and suitable for monitoring babesia propagation media and animal hosts.

Description

technical field [0001] The invention relates to a method for detecting Babesia and a special kit thereof, belonging to the field of biotechnology. Background technique [0002] The main clinical symptoms of Babesiosis are high fever, hemolytic anemia, jaundice and hemoglobinuria. Zoonoses. In recent years, there have been continuous occurrences of human infection cases around the world, and even outbreaks in several states in the United States. Confirmed / suspected cases of Babesia have continued to occur in Shandong, Zhejiang, Xinjiang, Yunnan, Beijing and other places in my country. "New health threats". At present, more than 100 species of Babesia parasitic in vertebrates have been reported in the world. Babesia that infects humans mainly includes Babesia parvum, Babesia dunnai, Babesia divergentis, Babesia orioni, and Babesia KO1 strain. Due to the presence of a considerable proportion of recessive or subclinical infections in the disease, clinical misdiagnosis and mis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12Q1/6893C12Q1/6851C12Q1/04C12N15/11C12R1/90
Inventor 江佳富曹务春蒋宝贵张圆孙毅江瑞若
Owner MICROBE EPIDEMIC DISEASE INST OF PLA MILITARY MEDICAL ACAD OF SCI
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