Transgenic Papaya PRSV Resistance Detection
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Solution Overview
Problem
Current methods for controlling Papaya ringspot virus (PRSV) in papaya plants are not effective in providing long-term protection, and there is a need for reliable and specific detection methods for transgenic papaya lines resistant to PRSV, especially for regulatory compliance and safety tracing of genetically modified organisms (GMOs).
Innovation Solution
Development of isolated nucleic acid molecules and primers specific to the transgenic papaya line 16-0-1, including a nucleic acid molecule with a right border flanking region, a left border flanking region, and a transgene sequence with the papaya ringspot virus coat protein gene, along with PCR-based methods for identifying and generating transgenic papaya lines resistant to PRSV, using specific primer pairs and probes for accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional control measures (aphid selection, silver mulch, cross-protection) are used to protect papaya from PRSV, then some level of protection is achieved, but long-term effective protection is not provided
Solution Approach 1:
The patent extracts the viral coat protein gene from the PRSV genome and inserts it into the papaya plant genome through genetic transformation. This extracted viral component triggers posttranscriptional gene silencing that specifically targets and degrades both viral RNA and transgenic mRNA in a sequence-specific manner, providing long-term resistance without requiring continuous external intervention
Solution Approach 2:
The patent implements preliminary action by pre-introducing the viral coat protein gene into the papaya genome before virus infection occurs. This creates a preemptive defense mechanism where the plant is already primed to recognize and silence viral RNA upon infection, eliminating the need for reactive control measures after infection begins
2Reliability
If netting is used to prevent aphid-transmitted PRSV infection, then effective control is achieved, but high cost, environmental hazards, and vulnerability to tropical storms occur
Solution Approach 1:
The patent replaces the mechanical physical barrier (netting) with a biological molecular mechanism (RNA-mediated gene silencing). Instead of using external physical structures to block virus transmission, the plant's own cellular machinery is harnessed to recognize and degrade viral RNA through sequence-specific posttranscriptional gene silencing, eliminating the need for netting and its associated environmental and economic problems
3Reliability
If transgenic papaya lines are developed for PRSV resistance, then broad-spectrum resistance is achieved, but specific and reliable detection methods for regulatory compliance are needed
Solution Approach 1:
The patent develops detection methods that target specific local characteristics of the transgenic integration sites. By designing primers and probes that recognize unique flanking sequences adjacent to the inserted coat protein gene, the detection system achieves high specificity for particular transgenic lines while maintaining sensitivity, enabling regulatory compliance through precise identification of genetically modified plants
Data Source
AI summary
Provided is an isolated nucleic acid molecule having a right border flanking region, a left border flanking region and a transgene sequence between the right border flanking region and the left border flanking region, wherein the right border flanking region having at least 90% homology with the sequence set forth in SEQ ID NO: 29; the left border flanking region having at least 90% homology with the sequence set forth in SEQ ID NO: 31; and the transgene sequence having a papaya ringspot virus coat protein gene and a promoter operably linked to the papaya ringspot virus coat protein gene. Primers, probes and kit derived from the isolated nucleic acid molecule are proved to be useful for identifying the transgenic papaya line 16-0-1 in a specific, reproducible, sensitive and reliable way.