Pathogenesis Quantification for Citrus Greening Blight Control
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Solution Overview
Problem
Current methods for diagnosing and controlling citrus greening blight, also known as Huanglongbing (HLB), are inadequate due to the complexity of symptoms similar to other tree ailments and the need for high-sensitivity detection of low replication levels of Candidatus Liberibacter spp., which are difficult to eradicate using antibiotic solutions.
Innovation Solution
A novel pathogenesis model is developed for diagnostic, prognostic, and treatment methods involving nucleic acid quantification of pathogens and hosts using oligonucleotide primers in nucleic acid amplification reactions to calculate a pathogen index, along with the use of bacteriophages and antiviral agents to inhibit citrus greening blight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PCR based methods are used for detection of Ca. L. asiaticus bacterium, then detection sensitivity is improved, but the complexity of diagnosis increases due to similar symptoms with other tree ailments
Solution Approach 1:
The diagnostic approach is segmented into multiple components: (1) quantitative PCR assays for detecting pathogen DNA, (2) measurement of host plant stress markers, and (3) calculation of a pathogenesis index that integrates both pathogen load and host response. This segmentation allows for systematic differentiation between HLB infection and other tree ailments by considering multiple parameters rather than relying on a single test or visual symptoms alone.
2Reliability
If antibiotic control is used against Ca. L. bacterium, then pathogen suppression is achieved, but treatment cost and environmental impact increase
Solution Approach 1:
The invention implements a feedback-based diagnostic and monitoring system that quantifies pathogen load and host stress levels to assess disease progression and treatment efficacy. By continuously monitoring the pathogenesis index, the system provides feedback that enables optimization of treatment strategies, reducing reliance on prophylactic antibiotic applications and allowing for targeted, evidence-based intervention only when necessary.
3Reliability
If infected trees are destroyed for HLB control, then disease spread is prevented, but economic loss increases due to premature tree removal
Solution Approach 1:
The quantitative PCR-based diagnostic system enables preliminary detection and monitoring of HLB infection before symptoms become severe or irreversible. By detecting pathogen presence and quantifying pathogenesis early in the infection process, the system allows for early intervention strategies that can slow disease progression and extend tree productivity, thereby delaying or preventing the need for premature tree removal and associated economic losses.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables effective detection, prognosis, and treatment of citrus greening blight by quantifying pathogen and host nucleic acids to derive a pathogen index, and using bacteriophages and antiviral agents to inhibit the disease, providing a clinical utility for drug treatment and prevention.
Implementation Method 1
nucleic acid quantification of pathogens and hosts using oligonucleotide primers in nucleic acid amplification reactions
Implementation Method 2
Bacteriophages or phages are viruses which infect bacteria
Implementation Method 3
administering to the individual in need a composition comprising an effective amount of an agent selected from the group consisting of nucleoside, non-nucleoside, nucleotide, non-nucleotide, ribonucleoside, and a ribonucleoside analog that selectively inhibits viral replication
Data Source
AI summary
The invention relates to a novel pathogenesis model, method, or kit for detecting pathogenesis in a subject. In particular, the invention provides a pathogen index derived from a ratio of the amount of dual pathogen targets relative to the amount of host quantitative measures. The pathogen index is used in diagnosis, prognosis, and/or treatment strategy of any disease, including citrus greening diseases (HLB). Research tools and methods for screening drugs for treating or preventing citrus greening diseases, as well as treatment or prevention methods for citrus greening diseases are also provided.