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Microarray Based Multiplex Pathogen Analysis and Uses Thereof

  • US 20190085414A1
  • Filed: 10/11/2018
  • Published: 03/21/2019
  • Est. Priority Date: 12/28/2015
  • Status: Active Grant
First Claim
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1. A method for identifying pathogens in a plant sample comprising the steps of:

  • a) harvesting pathogens from a plant tissue sample;

    b) isolating total nucleic acids comprising DNA;

    c) performing a first amplification in tandem in a single assay in the presence of plant DNA and non-DNA nucleic acids using at least one first primer pair selective for DNA isolated from the pathogens, to obtain one or more pathogen-specific first amplicons;

    d) performing a second amplification in tandem using the pathogen-specific first amplicons as a template and at least one first fluorescent labeled second primer pair having a sequence complementary to an internal flanking region in the first amplicons to obtain first fluorescent labeled second amplicons;

    e) hybridizing the second amplicons with nucleic acid probes specific for signature sequence determinants in the pathogen DNA, said nucleic acid probes immobilized at specific known positions on a 3-dimensional lattice microarray via a second fluorescent labeled bifunctional polymer linkers;

    f) washing the microarray at least once;

    g) imaging the microarray to detect a first fluorescent signal corresponding to the first fluorescent labeled second amplicons and a second fluorescent signal corresponding to the nucleic acid probes immobilized at the specific known positions on the microarray via the second fluorescent labeled bifunctional polymer linkers;

    h) superimposing the first fluorescent signal with the second fluorescent signal to obtain a superimposed signal image; and

    i) comparing the sequence of the nucleic acid probe at one or more superimposed signal positions on the microarray with a database of signature sequence determinants for a plurality of pathogen DNA, thereby identifying the pathogens in the sample.

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