Chemokine receptor CCR5 Delta 32 genetic analysis using multiple specimen types and the NucliSens Basic Kit

Area of Science:

• Genetics and Molecular Biology
• Virology
• Clinical Diagnostics

Background:

• The CCR5 Delta32 deletion is linked to HIV-1 resistance and delayed disease progression.
• Accurate CCR5 genotyping is crucial for understanding HIV-1 infection dynamics.
• Existing genotyping methods can be costly or have limitations with certain sample types.

Purpose of the Study:

• To modify a nucleic acid sequence-based amplification (NASBA) assay for CCR5 Delta32 genotyping using the NucliSens Basic Kit.
• To evaluate a new target-specific sandwich oligonucleotide detection methodology.
• To compare the performance of the modified assay with existing methods across various specimen types.

Main Methods:

• Modification of a NASBA-based CCR5 genotyping assay for the NucliSens Basic Kit.
• Implementation of a new target-specific sandwich oligonucleotide detection methodology.
• Comparison of the modified assay with the original NASBA assay and DNA PCR using diverse sample types (PBMC, whole blood, dried blood spots, buccal scrapings, plasma).

Main Results:

• The modified NucliSens Basic Kit NASBA assay demonstrated 100% concordance with original NASBA and DNA PCR for CCR5 Delta32 genotypic analysis.
• The modified assay maintained 100% sensitivity with peripheral blood mononuclear cells and whole blood.
• Compared to DNA PCR, the modified NASBA assay showed superior sensitivity (100%) with dried blood spots, buccal scrapings, and plasma.

Conclusions:

• The NucliSens Basic Kit NASBA assay is a sensitive and specific method for CCR5 Delta32 genotyping.
• This modified assay offers a cost-effective alternative using generic probes.
• The assay is effective across multiple sample types, enhancing its utility in clinical and research settings.