SNP-Based Pig Breeding for PCV2 Resistance via CRISPR and siRNA
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Solution Overview
Problem
Current methods fail to effectively determine a pig's susceptibility to Porcine Circovirus 2 (PCV2) infection and do not provide reliable means for selecting breeding stock or reducing susceptibility to PCV2, leading to significant health issues such as Post-Weaning Multi-systemic Wasting Syndrome (PMWS) in pigs.
Innovation Solution
A method involving genome assaying to identify specific single nucleotide polymorphisms (SNPs) associated with resistance to PCV2 infection, combined with the use of siRNA compositions and CRISPR-Cas9 gene editing to modify pigs, reducing their susceptibility to PCV2 by knocking down SYNGR2 mRNA and editing genes like BIRC5 and SOCS3, thereby decreasing the incidence and severity of PCVAD symptoms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If genome assaying and SNP identification methods are developed, then susceptibility determination accuracy is improved, but current methods fail to provide reliable means for selecting breeding stock
Solution Approach 1:
The patent replaces traditional phenotypic selection methods with genomic-based selection using SNP identification. By detecting specific genetic markers (SNPs) associated with PCV2 resistance, the system substitutes mechanical/observational breeding selection with molecular-level genetic analysis, enabling more accurate and reliable breeding stock selection based on genetic susceptibility profiles.
Solution Approach 2:
The patent introduces SNP markers as intermediary indicators between the complex genetic susceptibility to PCV2 and the breeding selection decision. Instead of directly assessing susceptibility through complex phenotypic observation, the system uses specific SNP markers (such as those in SLA-II, BIRC5, SOCS3, and SYNGR2 genes) as measurable intermediaries that correlate with disease resistance, simplifying the selection process while maintaining accuracy.
2Reliability
If siRNA compositions and gene editing are used to modify pigs, then resistance to PCV2 infection is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts and targets specific genetic elements (SNYGR2, BIRC5, SOCS3 genes) that contribute to PCV2 susceptibility. By using siRNA to specifically knock down SYNGR2 expression and CRISPR-Cas9 to edit specific gene sequences, the system removes or modifies only the problematic genetic components responsible for viral susceptibility, rather than attempting to modify the entire genome or use complex multi-gene systems.
Solution Approach 2:
The patent changes the genetic parameters of the pig genome by introducing specific SNP variations or knocking out susceptibility genes. Through CRISPR-Cas9 mediated gene editing, the system permanently alters the DNA sequence at target loci (such as creating frameshift mutations in SYNGR2), changing the genetic parameter from susceptible to resistant state, providing stable and heritable protection.
3Object-affected harmful factors
If specific SNPs are identified and used for breeding selection, then incidence and severity of PCVAD symptoms are reduced, but the complexity of genome assaying increases
Solution Approach 1:
The patent applies local quality analysis by focusing genome assaying efforts on specific regions of interest rather than analyzing the entire genome uniformly. The system targets specific loci known to be associated with PCV2 susceptibility, such as the SLA-II region on chromosome 7, and specific genes (BIRC5, SOCS3, SYNGR2). This localized approach reduces the complexity of genome assaying while maintaining high accuracy in susceptibility determination.
Solution Approach 2:
The patent performs preliminary identification and validation of susceptibility-associated SNPs before implementing breeding selection programs. By pre-establishing the correlation between specific SNP markers and PCV2 resistance through research and validation, the system creates a ready-to-use marker panel that can be rapidly deployed in breeding programs without requiring de novo genome analysis for each selection decision, thereby reducing operational complexity.
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
The approach provides complete or significant protection against PCV2 infection, reducing the incidence and severity of PCVAD symptoms by up to 95% in pigs, making them more resistant to the virus and improving their health outcomes.
Implementation Method 1
the composition knocks down SYNGR2 mRNA
Implementation Method 2
CRISPR-Cas9 gene editing to modify pigs, reducing their susceptibility to PCV2 by knocking down SYNGR2 mRNA and editing genes like BIRC5 and SOCS3
Data Source
AI summary
The present disclosure provides compositions and methods for increasing resistance to PCV2 infection in pigs. The increased resistance may be the result of siRNA or genetic modification through CRISPR or a vectored virus targeting SNPs that are resistant to PCV2 infection.