Development of a rapid 21-plex autosomal STR typing system for forensic applications

Area of Science:

• Forensic Science
• Molecular Biology

Background:

• DNA Short Tandem Repeat (STR) genotyping is crucial in forensic investigations.
• Existing methods require significant analysis time, necessitating faster alternatives.

Purpose of the Study:

• To develop and validate a rapid 21-plex STR typing system.
• To reduce DNA analysis time for forensic applications.

Main Methods:

• Established a novel 21-plex STR typing system encompassing 13 CODIS loci and additional markers.
• Optimized amplification protocols to achieve a minimum time of 90 minutes.
• Validated the system according to SWGDAM and Chinese National Standard (GA/T815-2009) guidelines.

Main Results:

• The 21-plex STR typing system successfully reduced amplification time to 90 minutes.
• The system demonstrated efficacy without the need for DNA extraction.
• Validation confirmed the system's reliability and performance.

Conclusions:

• The developed 21-plex STR typing system offers a valuable tool for rapid criminal investigations.
• This advancement significantly improves the efficiency of forensic DNA analysis.
• The system meets stringent validation standards for forensic use.