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Multiplex RT-PCR/PCR for simultaneous detection of bovine coronavirus, bovine rotavirus, Cryptosporidium parvum, and Escherichia coli

a multi-core, rtpcr technology, applied in the field of multi-core rtpcr/pcr method, can solve the problems of high cost, time-consuming and laborious process for detecting these pathogens, and currently used assays have severe limitations in detecting these agents, etc., to achieve rapid detection, sensitive, and specific

Inactive Publication Date: 2005-10-27
BOARD OF TRUSTEES OPERATING MICHIGAN STATE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The present invention provides a multiplex RT-PCR / PCR assay which enables in a single assay the simultaneous detection of bovine rotavirus, bovine coronavirus, Cryptosporidium parvum, and Escherichia coli strains producing K99 pili or heat-stable enterotoxin STa or STb. The present invention has the advantage over the prior art in that it can detect any combination of bovine rotavirus, bovine coronavirus, Cryptosporidium parvum, or Escherichia coli strains producing K99 pili or heat-stable enterotoxin STa or STb in a single assay which is rapid, sensitive, and specific.
[0022] Therefore, it is an object of the present invention to provide a multiplex PCR test which allows the rapid, sensitive, and specific detection of bovine rotavirus, bovine coronavirus, Cryptosporidium parvum, and K99 Escherichia coli in a single assay.

Problems solved by technology

Identification of these pathogens is a time consuming and laborious process.
However, currently used assays have severe limitations in detecting these agents.
Virus isolation and bacterial culture methods are labor intensive and costly and can involve days or weeks of culturing.
Electron microscopy is also labor intensive and also is of limited sensitivity.
ELISA is also a time consuming method.
However, the primary drawback of ELISA is that it can result in false negatives when antigen-antibody complexes are shed instead of free virus particles and ELISA has limited sensitivity.
None of the above methods are suitable for the simultaneous detection of multiple pathogens in a sample.
PCR is a sensitive and rapid method for detecting pathogens, and it is amenable to simultaneously detecting multiple pathogens in a sample; however, using PCR for the simultaneous detection of multiple pathogens in a sample has been problematic.
The primary obstacles to simultaneous detection of multiple pathogens have been cross-reactivity and preferential amplification of particular target sequences in the sample at the expense of the other target sequences in the sample.
However, the method does not include RT-PCR for detecting RNA viruses.
In general, because of the difficulty in developing PCR methods, particularly RT-PCR methods, that enable simultaneous detection of multiple pathogens in a sample, most samples to be analyzed by PCR for multiple pathogens, are separately tested for each of the multiple pathogens in separate PCR reactions.

Method used

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  • Multiplex RT-PCR/PCR for simultaneous detection of bovine coronavirus, bovine rotavirus, Cryptosporidium parvum, and Escherichia coli
  • Multiplex RT-PCR/PCR for simultaneous detection of bovine coronavirus, bovine rotavirus, Cryptosporidium parvum, and Escherichia coli

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0064] This example shows a method for recovering nucleic acids from feces. Both RNA and DNA were simultaneously extracted from 12 fecal specimens from calves with diarrhea submitted to the Animal Health Diagnostic Laboratory at Michigan State University using the Qiagen DNEASY Tissue Kit following the DNEASY protocol for animal tissues in the DNEASY Tissue Kit Handbook (Qiagen, Inc., April 1999 Edition, pp. 16-18) provided by the manufacturer as modified below.

[0065] About 20 to 30 mg of feces were resuspended in 180 μl ATL buffer (Qiagen, Inc.). To lyse the cells in the suspension, 20 μl of proteinase K was added and the suspension was incubated for 30 minutes at 55° C. Afterwards, to disrupt the C. parvum oocysts, four freeze-thaw cycles were performed. Each freeze-thaw cycle consisted of freezing the suspension in a dry ice-acetone bath for 2 minutes followed by thawing in a 37° C. waterbath for another 2 minutes. After the last freeze-thaw, the suspension was centrifuged at 15...

example 2

[0067] This example shows the multiplex RT-PCR / PCR assay of the present invention using the nucleic acids isolated in Example 1 to detect bovine corona virus, bovine rotavirus, and Cryptosporidium parvum.

[0068] A single reaction tube was used for the multiplex reaction of each nucleic acid sample from Example 1. In this example, 12 separate multiplex reactions were performed.

[0069] The multiplex reactions were performed using the Qiagen ONESTEP RT-PCR Kit in a final reaction volume of 50 μl with the following final primer concentrations. The amount of each primer was as follows: 0.6 μM of each Cryptosporidium parvum primer (SEQ ID NO:1 and SEQ ID NO:2); 0.9 μM of each bovine coronavirus primer (SEQ ID NO:3 and SEQ ID NO:4); and, 0.6 μM of each bovine rotavirus primer (SEQ ID NO:5 and SEQ ID NO:6).

[0070] Prior to performing the PCR step of the reaction, i.e., before adding the enzyme mix, the samples containing the nucleic acids were exposed to a denaturing step to denature the do...

example 3

[0076] This example illustrates separation of bovine coronavirus, bovine rotavirus, Cryptosporidium parvum, and Escherichia coli K99 from a fecal sample.

[0077] Dynabeads pan mouse IgG (Dynal, Inc. #110.21) are resuspended thoroughly in their storage vial. Four tubes are set up and to each of the tubes, 25 μl of 107 beads per ml is transferred. The tubes are placed in a magnetic block (Home Depot) and the fluid is removed. The beads are washed twice with washing buffer (phosphate buffered saline (PBS) containing 1% bovine serum albumen (BSA)). Next, for each tube, the beads are incubated with mouse monoclonal antibodies against one of bovine coronavirus, bovine rotavirus, Cryptosporidium parvum, or Escherichia coli K99 in washing buffer at 1 μg of antibodies for every 107 beads. Thus, four tubes are prepared, each containing antibodies against one of the four pathogens. The antibodies are bound to the IgG on the beads by incubating for 2 hours at 4° C. with gentle mixing using a mix...

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Abstract

The present invention provides a multiplex RT-PCR / PCR method, which enables in a single assay the simultaneous detection of any combination of bovine rotavirus, bovine coronavirus, Cryptosporidium parvum, and optionally, Escherichia coli strains producing K99 pili or heat-stable enterotoxin STa.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] Not applicable. STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] Not applicable. BACKGROUND OF THE INVENTION [0003] (1) Field of the Invention [0004] The present invention relates to a multiplex RT-PCR / PCR method, which enables in a single assay the simultaneous detection of any combination of bovine rotavirus, bovine coronavirus, Cryptosporidium parvum, and optionally, Escherichia coli strains producing K99 pili and heat-stable enterotoxin STa or STb. [0005] (2) Description of Related Art [0006] In the United States, bovine rotavirus, bovine coronavirus, Cryptosporidium parvum, and Escherichia coli strains producing K99 pili or fimbriae or heat-stable enterotoxin STa are the five most common infectious agents in neonatal calf diarrhea, commonly referred to as scours. The relative incidence of these pathogens in a multi-state survey of causes of scours in beef cattle was 35% for rotavirus and coronavirus combined, 2...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12Q1/68C12Q1/70
CPCC12Q1/701C12Q1/689C12Q2600/16
Inventor MAES, ROGERWISE, ANNABEL
Owner BOARD OF TRUSTEES OPERATING MICHIGAN STATE UNIV
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