Aquatic Animal Antibiotic Detection Using DNA Methylation Profiles
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Solution Overview
Problem
Current methods for detecting antibiotic and chemical use in aquatic animals are inadequate, as they rely on residue testing in blood or tissues, which fails to capture all antibiotic classes, especially those added to feed or water, and lack a means to assess historical usage.
Innovation Solution
Utilize DNA methylation patterns to detect antibiotic and chemical use by comparing the methylation status of CpG sites in test animals to a reference, identifying hypomethylation or hypermethylation as indicators of antibiotic and chemical exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If residue testing in blood or tissues is used to detect antibiotic use, then current antibiotic residues can be detected, but historical antibiotic use cannot be assessed and many antibiotic classes are missed
Solution Approach 1:
The patent uses DNA methylation patterns as an intermediary biomarker that indirectly records antibiotic exposure history. Instead of directly detecting antibiotic residues, the method detects epigenetic modifications (methylation status of CpG sites) that serve as a persistent record of past antibiotic exposure, thereby recovering historical usage information that direct residue testing cannot provide
Solution Approach 2:
The patent replaces the chemical detection mechanism (residue testing) with a biological epigenetic marker detection mechanism. By substituting direct chemical analysis with analysis of DNA methylation patterns, the method achieves both broader coverage of antibiotic classes and the ability to detect historical exposure, as methylation patterns persist long after antibiotic residues have degraded
2Reliability
If chemical assays are used to test for antibiotic residues, then presence of antibiotics in blood or tissues can be detected, but usage of antibiotics added to feed or water is not captured
Solution Approach 1:
The patent creates a universal detection method that works across all antibiotic classes by targeting the common biological response (DNA methylation changes) rather than detecting specific chemical structures. This single epigenetic-based approach can identify exposure to any antibiotic that induces methylation changes, making the method universally applicable to all antibiotic classes without requiring class-specific assays
Solution Approach 2:
The method uses DNA methylation patterns as a universal intermediary marker that translates diverse antibiotic exposures into a common detectable signal. Different antibiotic classes may cause different specific methylation changes, but they all produce detectable epigenetic markers, allowing a single detection platform to cover multiple antibiotic classes that would otherwise require separate chemical assays
3Loss of time
If no epigenetic markers are analyzed, then current antibiotic use can be detected via residues, but past antibiotic exposure cannot be determined
Solution Approach 1:
The patent applies preliminary action by detecting epigenetic markers that are established during antibiotic exposure and persist long after the exposure ends. The methylation patterns are formed during the antibiotic treatment period and serve as a lasting record, allowing detection well after the actual exposure event, thereby extending the detectable time window backward in time
Solution Approach 2:
The method detects more than just current antibiotic presence by capturing historical exposure information through persistent epigenetic markers. The methylation changes serve as an exaggerated or extended signal that persists beyond the normal detection window of residue testing, providing excessive information about past exposure that enhances the time window for detection
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
Provides a simple and accurate method to detect current and past antibiotic and chemical use in aquatic animals, differentiating between therapeutic and prophylactic use, and predicting potential adverse effects on animal welfare and production sustainability.
Implementation Method 1
DNA methylation patterns are modified along the life of an individual by environmental forces like diet, stress, drugs, or pollution among many others
Data Source
AI summary
A method of determining if an aquatic test animal and/or test animal from which a product is derived has been treated and/or is currently undergoing treatment with at least one antibiotic and/or veterinary chemical includes: (a) determining a test methylation profile from genomic material contained in a biological sample obtained from the test animal and/or animal-derived product; and (b) comparing the test methylation profile obtained from (a) with a reference methylation profile obtained from a control animal of the same biological taxon of the test animal, where the control animal was not treated and/or is not currently undergoing treatment with at least one antibiotic and/or veterinary chemical, wherein a difference in the test methylation profile of (a) compared to the reference methylation profile from the control animal is indicative of the test animal having been treated and/or is currently undergoing treatment with at least one antibiotic and/or veterinary chemical.