PCR in Forensic Science: A Critical Review

Area of Science:

• Forensic Science
• Molecular Biology
• Genetics

Background:

• Polymerase chain reaction (PCR) is a cornerstone technique in molecular biology with broad applications.
• Its integration into forensic science initiated a new era of DNA profiling, particularly for trace evidence.
• Trace DNA samples present significant challenges due to small quantities, degradation, and inhibitors.

Purpose of the Study:

• To review the evolution of PCR technology from its origins to its current forensic applications.
• To discuss the driving forces behind PCR advancements for DNA profiling.
• To critically compare PCR cycling conditions in commercial kits and evaluate emerging methods.

Main Methods:

• Literature review of PCR development and its application in forensic science.
• Analysis of factors influencing PCR efficiency with challenging DNA samples.
• Comparative assessment of PCR cycling conditions and newer methodologies.

Main Results:

• PCR has been continually refined to meet the demands of forensic DNA profiling, pushing its capabilities.
• Significant challenges persist in profiling degraded and inhibited DNA samples, despite technological progress.
• Various PCR strategies and commercial kits have been developed to enhance performance with limited or compromised DNA.

Conclusions:

• The evolution of PCR has been critical for advancing forensic DNA profiling capabilities.
• Addressing the complexities of trace and inhibited DNA samples remains an active area of research and development.
• Future directions in PCR technology hold promise for further enhancing forensic genetic analysis.