Forensic Sample Identification Using MicroRNA Markers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for identifying biological fluids in forensic samples are insensitive, time-consuming, and costly, often requiring multiple tests to confirm the presence and type of fluids, and fail to reliably detect human saliva or vaginal secretions, leading to a trend of bypassing these methods in favor of DNA analysis, which is more expensive and lacks crucial information.
Innovation Solution
The use of microRNA (miRNA) markers for detecting the nature of a sample by identifying specific small non-coding RNAs, allowing for parallel analysis and reliable identification of body fluids such as blood, semen, saliva, and vaginal secretions through quantitative detection methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional immunological or enzymatic detection methods are used to identify body fluids, then the presence of certain proteins can be detected, but the sensitivity is insufficient for forensic investigation where minute amounts of materials are present
Solution Approach 1:
The patent changes the detection parameter from proteins to microRNAs, which are more stable and can be detected at lower concentrations. This parameter change enables reliable identification even with minute amounts of forensic samples while maintaining high sensitivity through molecular biology techniques like RT-qPCR.
Solution Approach 2:
The patent replaces conventional immunological detection methods with molecular biology-based detection. By substituting protein detection with microRNA detection and using amplification techniques, the system achieves both high sensitivity for trace samples and high reliability for definitive identification.
2Reliability
If multiple conventional tests are performed in serial manner to confirm presence and type of biological fluids, then identification can be achieved, but the process is time-consuming and labor-intensive
Solution Approach 1:
The patent merges multiple detection functions into a single microRNA-based assay system. By detecting fluid-specific microRNA profiles, the method simultaneously determines both the presence and type of biological fluids in one test, eliminating the need for multiple sequential conventional tests while maintaining high confirmation accuracy.
Solution Approach 2:
The patent creates a universal detection platform that can identify multiple types of body fluids (blood, semen, saliva, vaginal secretions) using a single methodological approach. This multi-functional system replaces multiple specialized tests, reducing both time and labor requirements while maintaining reliable identification across different fluid types.
3Loss of information
If conventional body fluid identification methods are used, then information on sample nature can be obtained, but the methods are not sensitive enough and often require bypassing to DNA analysis which is more expensive
Solution Approach 1:
The patent changes the detection target from proteins to microRNAs, which are more stable and detectable at lower concentrations. This enables obtaining information on sample origin with higher sensitivity while consuming less material, as microRNAs can be reliably detected in trace forensic samples without requiring the large sample volumes needed for conventional methods.
Solution Approach 2:
The patent uses microRNAs as detection targets instead of proteins, allowing for highly sensitive detection with minimal sample consumption. The method preserves valuable forensic samples by requiring only trace amounts for analysis, avoiding the need to consume larger samples in multiple conventional tests or proceed to expensive DNA analysis.
4Productivity
If DNA analysis is performed directly without body fluid identification, then cost and time are reduced, but crucial information on the nature and origin of the sample is lost
Solution Approach 1:
The patent performs preliminary identification of body fluid type using microRNA detection before proceeding to DNA analysis. This preliminary action provides crucial information on sample nature (blood, semen, saliva, vaginal secretions) that guides subsequent investigative steps, while maintaining high productivity through a rapid, sensitive single-step detection method that consumes minimal sample.
Data Source
AI summary
A method for determining the nature of a sample is provided, wherein the presence or absence of at least one marker small non-coding RNA in the sample is detected. Suitable marker small non-coding RNAs for different samples such as blood, saliva, semen and vaginal secretions are provided. Also provided are suitable kits and methods for identifying marker small-non coding RNAs.