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Bartonella henselae PCR identification method

An identification method, the technology of the outer membrane protein gene, applied in the field of biological detection, can solve the problems of cumbersome operation, time-consuming, high cost, cumbersome analysis process, etc., and achieve the effect of increasing specificity and ensuring accuracy

Inactive Publication Date: 2012-01-11
ICDC CHINA CDC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The probe hybridization method has been used by some researchers in the past, but due to the cumbersome operation and low specificity of the method, few people have used it.
Although the method of specific antibody detection and identification has been reported and applied, the problem of cross-reaction with other bacteria and Bartonella still exists
Although the nucleic acid sequence analysis method can provide accurate identification results to distinguish the species of Bartonella, this method needs to sequence the amplification products of the target gene, then perform sequence comparison and construct a phylogenetic tree. The analysis process is cumbersome, and not only the degree of instrumentation is required Higher, higher professional requirements for operators, and time-consuming and expensive, can only be carried out in professional laboratories, which is not conducive to popularization and application
The fluorescent quantitative PCR method used in a small number of professional laboratories also has the same problem as above, and the accuracy of the detection still needs a lot of experimental research to confirm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 multiplex PCR primer screening

[0031] (1) RAPD-PCR

[0032] Three random primers S15: 5′-GGAGGGTGTT-3′ (SEQ ID No.16), S18: 5′-CCACAGCAGT-3′ (SEQ ID No.17) and S103: 5′-AGACGTCCAC-3′ (SEQ ID No. ID No.18) for RAPD-PCR amplification. The reaction system used 20 μL of QIAGEN Fast Cycling PCR Kit, 10 pmol of each of the above primers, and 50 ng of genomic DNA of Bartonella henselae (purchased from the American Type Culture Collection, ATCC49882). Amplification conditions were melting at 94°C for 5 minutes; denaturation at 94°C for 40 seconds, annealing at 40°C for 40 seconds, extension at 72°C for 1 minute, 35 cycles; extension at 72°C for 5 minutes.

[0033] (2) Cloning and sequencing of RAPD-PCR amplification products

[0034] The Bartonella henselae RAPD-PCR amplification bands A, B, C, D, E and F ( figure 1 ) were gel-cut and purified, and cloned into plasmids for sequencing. Sequence analysis showed that the amplified bands A, B, C, D, E and F were...

Embodiment 2

[0040] Embodiment 2PCR reaction condition optimization

[0041] 1. Primer concentration

[0042] Template: A commercially available nucleic acid extraction kit was used to extract the genomic DNA of the Bartonella henselae strain.

[0043] Reaction system: 50 μL amplification system, 10 μL of 10×Ex Taq buffer from Treasure Biotech, TaKaRa Ex Taq 5U, 5 mM dNTP mixture, 10 pmol each of primers BhAF-BhAR, Cpf-Cpr and 6f1-6f2 or primers BhAF-BhAR and Cpf- 10 pmol each of Cpr, 15 pmol of primers 6f1-6f2, 1 μL of DNA template, and deionized water to make up to 50 μL.

[0044] PCR amplification parameters: denaturation at 94°C for 30s, annealing at 54°C for 30s, extension at 72°C for 1min, a total of 25 cycles.

[0045] Gel electrophoresis and result observation: Take 5 μL of PCR product and 1 μL of 6× loading buffer, mix thoroughly, and place on 1% agarose gel for electrophoresis. The voltage was 5v / cm, the electrophoresis buffer was 0.5×TBE, and the results were observed and pho...

Embodiment 3

[0051] Embodiment 3 specificity detection experiment

[0052] Using the system optimized in Example 2 to amplify Bartonella quintana, Bartonella keshii (B.clarridgeiae), Bartonella keele (B.koehlerae), Bartonella vinsonii Boghof subspecies (B.vinsonii subsp.berkhoffii), Bartonella Vinsonii subsp.arupensis (B.vinsonii subsp.arupensis), Bartonella Elizabeth (B.elizabethae), Bartonella Graham (B.grahamii), Bartonella Tribochi ( B.tribocorum), B.doshiae, and B.bacilliformis did not have the three amplification bands A, C, and F at the same time. The A and F bands were amplified throughout the body, but the C band did not appear ( image 3 ). The results showed that amplifying the C band alone could also specifically identify Bartonella henselae. Amplifies Agrobacterium tumefaciens, Brucella, Rickettsia, Escherichia coli, Shigella, Vibrio cholerae, Staphylococcus aureus, Anaplasma, Campylobacter jejuni, Legionella, Acinetobacter baumannii, Hook 27 kinds of bacteria such as term...

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Abstract

The invention provides a bartonella henselae PCR identification method. Specific primers are designed according to a sequence hypervariable region of a bartonella henselae outer membrane protein gene BH13010 and specific amplification is performed by using tested sample DNA or bacterial cultures as a template. If a specific band can be obtained by amplification, bartonella henselae is identified.The sequences of the primers in the method are shown as SEQIDNo.6 and 7. The invention has advantages of good specificity of primers, high accuracy of identification method, simple operation, low requirement of equipments and low cost.

Description

technical field [0001] The invention relates to biological detection technology, in particular to a PCR identification method for Bartonella henselae. Background technique [0002] Bartonella henselae is the main pathogen causing cat-scratch disease (CSD). This disease is common (the main clinical manifestation is lymphadenitis) in children, the average age of onset is 14 years old, and the high incidence age is within 10 years old. Most patients manifested as erythematous papules or pustules at the wound after being scratched (or bitten) by a cat. Local lymph nodes were red, swollen, hot, palpable, hard, and 30% spontaneously suppurated, mostly in the head, face, upper extremities, and inguinal lymph nodes. The patient may also have symptoms such as general malaise, fever, and cough. Bartonella henselae can also cause endomenitis, Parinaud's oculoglandular syndrome (POGS), encephalitis, myelitis, peripheral neuropathy, unilateral or bilateral retinitis, hepatosplenic gra...

Claims

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Application Information

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IPC IPC(8): C12Q1/68C12Q1/04C12N15/11
Inventor 栗冬梅刘起勇张建中
Owner ICDC CHINA CDC
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