Quality control for DNA contamination in laboratories using PCR-based class II HLA typing methods

Area of Science:

• Molecular Biology
• Immunogenetics
• Laboratory Science

Background:

• Quality control in molecular histocompatibility typing is essential.
• Polymerase chain reaction (PCR) is commonly used to detect DNA contamination.
• Standardized methods are needed for reliable contamination detection.

Purpose of the Study:

• To develop and validate a primer set for detecting DNA contamination in histocompatibility testing.
• To assess the impact of sample concentration on PCR-based wipe tests.
• To optimize PCR protocols for enhanced sensitivity and accuracy.

Main Methods:

• Design and synthesis of a specific oligonucleotide primer set (RBQBf/RBQBr).
• Detection of genomic DNA and amplicon from reference cell lines and typing products.
• Validation studies using controlled DNA contamination and varying wipe test sample concentrations.

Main Results:

• The RBQBf/RBQBr primer set successfully detected genomic DNA (50-100 pg) and amplicon (1 copy).
• Detection of DR-B, DQ-B, and DP-B sequences was confirmed.
• Lower concentrations (1-2%) or diluted wipe test samples enhanced PCR sensitivity and optimized results, while higher concentrations (5-20%) were inhibitory.

Conclusions:

• The RBQBf/RBQBr primer set is effective for detecting DNA contamination and amplicon in molecular histocompatibility typing.
• Optimizing wipe test sample dilution is critical for sensitive and accurate PCR-based contamination detection.
• Routine testing for inhibitory factors in wipe tests is necessary for reliable laboratory quality control.