TRPM1 Gene Insertion Detection for Equine Genotype Analysis
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Solution Overview
Problem
The challenge lies in accurately detecting the causative mutation for leopard complex spotting and congenital stationary night blindness in equines, which is complicated by the highly variable nature of the spotting pattern and the difficulty in diagnosing congenital stationary night blindness, affecting breeding and management of horses.
Innovation Solution
A method is developed to test for the presence of an insertion in the TRPM1 gene after position 108,297,929 on horse chromosome 1, allowing for the determination of a horse's genotype regarding the Leopard Complex (LP) and its association with congenital stationary night blindness (CSNB), using specific primers and probes to differentiate between wild-type and insertion alleles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If breeders use traditional phenotypic selection for leopard complex spotting, then they can identify horses with desirable coat patterns, but the highly variable nature of spotting patterns and complex inheritance make it difficult to accurately predict and select homozygous animals
Solution Approach 1:
The patent replaces traditional phenotypic selection methods with a molecular genetic testing system. Specific primer pairs are designed to detect the causative mutation in the TRPM1 gene, allowing precise identification of homozygous, heterozygous, and wild-type animals regardless of the variable phenotypic expression of spotting patterns.
Solution Approach 2:
The invention shifts the selection criterion from phenotypic parameters (visual spotting patterns) to genotypic parameters (presence or absence of the TRPM1 mutation). This parameter change enables accurate prediction of inheritance patterns and allows breeders to select for homozygous status with certainty, overcoming the limitations of phenotypic variability.
2Measurement precision
If breeders test for the TRPM1 mutation to accurately identify homozygous animals, then selection accuracy improves, but the complexity of the testing methodology increases
Solution Approach 1:
The patent divides the genetic testing protocol into discrete, manageable components: specific primer pairs designed to amplify regions flanking the mutation, PCR amplification steps, and detection methods. This segmentation makes the complex molecular genetics process systematic and reproducible, reducing the barrier to implementation despite the increased technical complexity.
3Measurement precision
If diagnostic methods for congenital stationary night blindness are improved, then detection accuracy increases, but the difficulty in diagnosis and management of affected horses increases
Solution Approach 1:
The patent enables preliminary genetic screening for CSNB susceptibility before clinical symptoms manifest or before traditional ophthalmologic diagnosis is attempted. By testing for the TRPM1 mutation in the germ line, breeders and veterinarians can identify at-risk animals early, allowing for preventive management and reduced reliance on difficult-to-perform clinical diagnostic procedures.
Data Source
AI summary
Methods are provided for determining whether or not a horse is genetically normal, is a carrier of, or is affected with or predisposed to Congenital Stationary Night Blindness and/or leopard complex spotting. The method is based on detection of an insertion in an intron in the horse Transient Receptor Potential Cation Channel, Subfamily M, Member 1 (TRPM1) gene.