Bloodstain allotyping: an ELISA method for G1m(3)

Area of Science:

• Forensic Science
• Immunology
• Biochemistry

Background:

• Accurate bloodstain typing is crucial for forensic investigations.
• Existing methods like haemagglutination-inhibition have limitations in sensitivity and objectivity.
• The G1m(3) allotype is an important genetic marker in human populations.

Purpose of the Study:

• To develop a sensitive and objective method for typing bloodstains for the G1m(3) allotype.
• To evaluate the performance of a novel sandwich ELISA technique.

Main Methods:

• Development of a sandwich ELISA assay.
• Utilizing a commercial monoclonal antibody reagent.
• Testing the assay with plasma and bloodstain extracts.

Main Results:

• The sandwich ELISA method demonstrated high sensitivity, outperforming haemagglutination-inhibition.
• Effective typing was achieved with plasma and bloodstain extracts diluted up to 1 in 10,000.
• The method provided objective and reliable assessment of G1m(3) allotype.

Conclusions:

• The developed sandwich ELISA is a superior method for G1m(3) allotype typing of bloodstains.
• This technique offers enhanced sensitivity and objectivity for forensic analysis.
• The method is currently not suitable for saliva or semen typing.