Enhanced Genetically Variant Peptide Profiling from Human Hair Using Multiple Enzymes

Area of Science:

• Forensic Science
• Proteomics
• Biochemistry

Background:

• Genetically variant peptides (GVPs) from human hair proteins are crucial for forensic identification.
• Trypsin is the standard protease for generating peptides from hair proteins.
• Expanding proteome coverage is key to increasing GVP identification confidence.

Purpose of the Study:

• To investigate if alternative proteases improve sequence coverage in hair proteome analysis.
• To determine if using multiple proteases enhances the identification of genetically variant peptides (GVPs).
• To increase confidence in GVP identification for forensic applications.

Main Methods:

• Analysis of human hair proteome using various proteases: trypsin, keratinase, chymotrypsin, and Glu-C.
• Comparison of peptide profiles generated by different enzymatic digests.
• Identification and characterization of genetically variant peptides (GVPs).

Main Results:

• Employing multiple proteases significantly expanded sequence coverage of the hair proteome.
• Alternative enzymes like keratinase, chymotrypsin, and Glu-C provided complementary peptide information.
• Combined enzymatic digestion enhanced genetically variant peptide (GVP) profiling.

Conclusions:

• The use of multiple proteases, beyond standard trypsin, is effective for comprehensive hair proteome analysis.
• Enhanced GVP profiling through multi-enzyme digestion increases the reliability of forensic human identification.
• This approach offers a more robust method for confirming findings from tryptic digests in forensic science.