Split-Intein Toxin System for Single-Sex Offspring Generation
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Solution Overview
Problem
Current methods for generating single-sex offspring in agricultural applications, such as chicken breeding, are inefficient and resource-intensive, particularly in distinguishing male and female chicks, which leads to unnecessary resource waste and ethical concerns due to the culling of male chicks not suited for egg production.
Innovation Solution
The use of non-human vertebrate animals genetically modified with nucleotide sequences comprising promoters, split intein fragments, and toxin fragments, integrated into chromosomes, which, when expressed, result in the production of a functional toxin that kills male offspring, thereby ensuring a single-sex population.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional chicken sexing methods are used to distinguish male and female chicks, then sex identification can be achieved, but resource waste occurs due to delayed identification and culling of male chicks
Solution Approach 1:
The patent applies preliminary action by implementing sex-specific toxin expression during embryonic development rather than after hatching. Male embryos express the toxin through the Y chromosome-linked promoter, leading to their death during incubation. This eliminates the need for post-hatching sexing and culling, thereby preventing resource waste while maintaining identification accuracy.
2Productivity
If male chicks are culled after hatching, then ethical concerns are addressed, but productivity is reduced due to loss of incubation resources
Solution Approach 1:
The patent converts the harmful effect of male chick survival into a beneficial outcome by using sex-specific toxin expression. The Y chromosome-linked promoter drives toxin expression in male embryos, causing their death during incubation. This transforms the previously harmful practice of post-hatching culling into a beneficial pre-hatching selection, improving productivity while eliminating the ethical concerns of chick culling.
3Productivity
If split intein and toxin fragments are integrated into chromosomes, then single-sex offspring generation is achieved, but genetic modification complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the toxin gene into two separate fragments and placing them on different chromosomes. The first fragment is linked to a promoter active in one sex, while the second fragment is linked to a promoter active in the other sex. This segmentation allows for sex-specific toxin expression without requiring complex genetic constructs on a single chromosome, thereby achieving single-sex offspring generation with manageable genetic modification 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
This approach significantly increases egg hatching capacity by eliminating the need for sexing and reduces resource waste by ensuring only female chicks are viable, improving efficiency and addressing ethical concerns related to chick culling.
Implementation Method 1
proteins encoded by the first and second nucleotide sequences bind to one another, thereby producing an active toxin
Data Source
AI summary
Described herein are methods and compositions for generating single sex offspring using split-intein approach. In particular, methods and compositions are provided to generate single sex and genetically modified offspring. These techniques can be applied to compassionate animal breeding.