Related Experiment Videos
Fibronectin EIIIA splicing variant: a useful contribution to forensic wounding interval estimation
Ningguo Liu1, Yijiu Chen, Xiaohua Huang
1Department of Forensic Medicine, Institute of Forensic Science, Ministry of Justice, 1347 West Guangfu Road, Shanghai, China. liuningguo@yahoo.com.cn
Forensic Science International
|July 28, 2006
Summary
Forensic science can estimate injury timing using a novel test paper. This paper detects the EIIIA-Fn splicing variant, which appears after tissue injury, aiding in determining ante- and post-mortem wounds.
Area of Science:
- Biochemistry
- Forensic Science
- Tissue Engineering
Background:
- Fibronectin splicing variants, like the extra type III domain (EIIIA/EDA), are absent in adult tissues but present in fetal and injured tissues.
- This differential expression offers potential for forensic applications in estimating injury intervals.
Purpose of the Study:
- To investigate the expression of the EIIIA-Fn splicing variant in injured rat skin.
- To develop a rapid diagnostic tool for estimating wound age in forensic investigations.
Main Methods:
- Immunohistochemistry using a monoclonal antibody against EIIIA-Fn on contused rat skin samples.
- Development of a test paper utilizing immune colloidal gold technique for EIIIA-Fn detection in tissue homogenates.
Main Results:
- Positive EIIIA-Fn staining was observed in epidermal and hair follicle cells of injured rat skin starting at 6 hours post-injury.
- The intensity of staining correlated with the duration of the wound.
- The developed test paper accurately detected EIIIA-Fn in injured samples, with staining intensity varying by injury time, while normal skin showed no staining.
Conclusions:
- A strong correlation exists between EIIIA-Fn splicing variant expression and wound interval.
- The gold-labeled test paper is a promising tool for distinguishing ante- and post-mortem injuries and estimating wounding intervals in forensic science.