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Next-generation Sequencing

Next-generation Sequencing

The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
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Using Next-Generation Sequencing to Develop Molecular Diagnostics for Pseudoperonospora cubensis, the Cucurbit Downy

S Withers¹, E Gongora-Castillo¹, D Gent¹

¹First, second, fourth, fifth, and sixth authors: Department of Plant Pathology, North Carolina State University, Raleigh 27695-7616; third author: U.S. Department of Agriculture-Agricultural Research Service, Forage Seed and Cereal Research Unit, and Oregon State University, Corvallis 97331; and fourth and fifth authors: Center for Integrated Fungal Research, North Carolina State University, Raleigh 27695-7567.

|June 18, 2016

Summary

This study developed seven new DNA markers to accurately identify Pseudoperonospora cubensis, a key downy mildew pathogen affecting cucurbit crops. These markers enable rapid molecular diagnostics for improved disease management in agriculture.

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Area of Science:

Plant Pathology
Genomics
Molecular Diagnostics

Background:

Next-generation sequencing (NGS) accelerates the development of genomic resources for molecular diagnostics of infectious agents.
Oomycetes, such as downy mildew pathogens, are challenging to study due to difficulties in culturing.
Pseudoperonospora cubensis is an economically significant oomycete pathogen causing disease across diverse cucurbit crops.

Purpose of the Study:

To identify and validate specific DNA markers for the accurate identification of Pseudoperonospora cubensis.
To differentiate P. cubensis from closely related species like Pseudoperonospora humuli.
To develop tools for molecular diagnostics and pathogen monitoring.

Main Methods:

Comparative genomics using next-generation sequencing data from diverse P. cubensis and P. humuli isolates.
Bioinformatic analysis to identify unique and conserved genomic regions in P. cubensis.
Polymerase Chain Reaction (PCR) validation of candidate markers against a broad range of oomycete isolates.

Main Results:

Seven diagnostic DNA markers were identified as specific to Pseudoperonospora cubensis.
These markers demonstrated high specificity across various P. cubensis isolates from different hosts and regions.
The markers were validated against P. humuli and other oomycete species, confirming their specificity.

Conclusions:

The identified markers provide a reliable method for molecular diagnostics of P. cubensis in infected plant tissues.
These markers can be adapted for real-time PCR assays to monitor airborne P. cubensis inoculum.
This research offers valuable tools for managing downy mildew diseases in cucurbit crops.