Liver abscess inducing Klebsiella pneumonia specific gene sequence and application thereof

A Klebsiella pneumoniae and gene sequence technology, applied in the direction of microorganism-based methods, biochemical equipment and methods, and microbial measurement/testing, can solve the problem of easy missed diagnosis and delayed diagnosis and culture of Klebsiella pneumoniae liver abscess Low positive rate and other issues, to achieve high specificity

Active Publication Date: 2016-03-23
AFFILIATED HUSN HOSPITAL OF FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bacteria in the abscess cavity are mostly dead bacteria due to the use of antibiotics in the early stage of the patient and the phagocytosis and lysis of a large number of white blood cells, and the positive rate of culture is low
Klebsiella pneumoniae can be isolated and cultured from blood, combined with imaging results of liver abscess space, can also make a speculative diagnosis of Klebsiella pneumoniae liver abscess, but if it is an early liver abscess, the abscess cavity is hidden, and imaging The academic performance is not obvious, if you do not pay attention, it is easy to miss the diagnosis
In addition, blood culture takes a long time, and it takes 24-48 hours from the positive blood culture alarm to the final identification of the strain, which delays the diagnosis of Klebsiella pneumoniae liver abscess

Method used

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  • Liver abscess inducing Klebsiella pneumonia specific gene sequence and application thereof
  • Liver abscess inducing Klebsiella pneumonia specific gene sequence and application thereof
  • Liver abscess inducing Klebsiella pneumonia specific gene sequence and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The screening process of the specific gene sequence combines the next-generation sequencing technology (Next-Generation Sequencing, NGS), comparative genomics (Comparative Genomics) and bioinformatics (Bioinformatics) methods, and uses scientific statistical methods to compare the sequences in multiple pneumonia The specificity of the distribution in the Klebsiella genome was tested and PCR validation was performed in isolates of Klebsiella pneumoniae and non-Hepatoabscess Klebsiella pneumoniae to determine the presence of sequences in Klebsiella pneumoniae Specificity in primary bacteria. The specific implementation process is as follows:

[0042] Pathogen isolation and identification:

[0043] 1. Enrollment of patients with suspected Klebsiella pneumoniae liver abscess. Patients with clinically suspected Klebsiella pneumoniae liver abscess were screened according to the following criteria:

[0044] (1) Clinical manifestations of the patient: fever, chills and abdom...

Embodiment 2

[0069]Gene-specific verification:

[0070] The specific steps for the verification of three hepatic abscess-causing Klebsiella pneumoniae-specific genes in clinically isolated strains are:

[0071] 1. Select clinically isolated hepatic abscess and non-hepatic abscess Klebsiella pneumoniae strains for detection of sdm (shown in SEQ ID NO.1), lak (shown in SEQ ID NO.3) and asnC (shown in SEQ ID NO.2) Specificity in hepatoabscessogenic Klebsiella pneumoniae. 17 strains of Klebsiella pneumoniae isolated from the abscess of patients with liver abscess were selected as the detection group (hepatic abscess group), and 17 strains of Klebsiella pneumoniae isolated from non-Klebsiella pneumoniae patients with liver abscess were selected as negative controls group (non-hepatic abscess-induced group). At the same time, other common pathogenic bacteria (other pathogenic bacteria groups) isolated clinically were also selected to further verify the specificity of these factors in Klebsiell...

Embodiment 3

[0094] Application of sdm, lak and asnC sequences or primers designed based on their sequences in the preparation of Klebsiella pneumoniae liver abscess diagnostic kit:

[0095] The design idea of ​​this experiment is as follows: the clinically obtained blood culture samples are divided into a blood culture positive group and a healthy person negative group, where the blood culture positive group refers to all samples with bacteria cultured in the blood, not limited to the blood cultured with pneumonia. Lebsiella, including cultures of other pathogenic bacteria. Use PCR to detect the presence of specific factors (i.e. sdm, lak and asnC) in positive blood culture samples and negative blood culture samples, and finally analyze the corresponding analysis of the PCR results and the patient's final clinical diagnosis, so as to judge whether the method provided by the present invention is suitable for Detection rate of Klebsiella pneumoniae liver abscess.

[0096] 1. Collection of ...

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PUM

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Abstract

The invention provides a liver abscess inducing Klebsiella pneumonia specific gene sequence and an application thereof. The sequence of the liver abscess inducing Klebsiella pneumonia specific gene sequence sdm is represented by SEQ ID NO.1. The gene specifically exists in liver abscess inducing Klebsiella pneumonia, and can be used as a Klebsiella pneumonia induced liver abscess diagnosis marker. The invention also provides primers TTGAATCTTACCCAGAGGAACTT and AACAGCACCTTTCACAACGACAT of the sdm sequence. The primers can specifically amplify the sdm sequence. The sequence and the primers thereof, provided by the invention, have very high specificity, can be used to diagnose Klebsiella pneumonia induced liver abscess, and have commercial exploitation values.

Description

technical field [0001] The invention relates to the field of medical disease diagnosis and drug selection for treatment, in particular to the gene-specific sequence of Klebsiella pneumoniae causing liver abscess and its application. Background technique [0002] Klebsiella pneumoniae (K.pneumoniaesubsp.pneumonia), belonging to the Enterobacteriaceae family, is negative for Gram staining, has a thick capsule, most of which have pili, no spores and flagella, and parasitizes on human skin, nasopharynx and Intestines, etc., can cause severe pneumonia, urinary tract infection and bloodstream infection, etc., and are common clinical opportunistic pathogens (LiB, ZhaoY, LiuC, ChenZ, ZhouD. MolecularpathogenesisofKlebsiellapneumoniae. FutureMicrobiol, 2014; 9(9) :1071-81). [0003] Liver Abscess (LA) is a secondary infectious disease that occurs in the liver, which can be caused by bacteria, fungi, parasites, etc. The center of the infected lesion liquefies necrosis, tissue dissolv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12Q1/68C12Q1/10C12N15/11C12R1/22
CPCC12Q1/689
Inventor 叶美萍王明贵徐晓刚黄金伟
Owner AFFILIATED HUSN HOSPITAL OF FUDAN UNIV
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