Identification of multiple genital HPV types and sequence variants by consensus and nested type-specific PCR coupled...

Area of Science:

• Virology
• Oncology
• Molecular Biology

Background:

• Genital human papillomavirus (HPV) infections are a major risk factor for cervical carcinogenesis.
• Early detection and characterization of HPV types are crucial for understanding disease progression and developing prevention strategies.

Purpose of the Study:

• To identify and characterize HPV types and their variants in cervical samples from female sex workers.
• To evaluate the utility of PCR and cycle sequencing as diagnostic tools for HPV detection.
• To assess the potential biological and clinical significance of identified HPV variants.

Main Methods:

• Polymerase chain reaction (PCR) and cycle sequencing were used to analyze cervical scrapings and biopsies.
• Consensus and type-specific HPV primers were employed for broad-spectrum detection.
• Automated ELISA systems with biotinylated probes were utilized for specific HPV type detection.
• DNA sequence analysis was performed to identify HPV variants and mutations.

Main Results:

• Twenty-seven out of 188 female sex workers tested positive for a range of HPV types, including HPV 6b, 16, 18, 31, 33, 34, 35, 45, 56, and 58, plus a novel type.
• Seven individuals had dual HPV infections.
• DNA sequencing revealed HPV variants with mutations, particularly in the E6 gene, leading to amino acid substitutions in the E6 oncoprotein.
• A HPV 16-specific probe successfully detected HPV 16 amplified products via ELISA.

Conclusions:

• PCR coupled with cycle sequencing is effective for identifying known and novel HPV types and variants, aiding in assessing cervical cancer risk.
• The identified HPV variants may have significant biological and clinical implications.
• The study underscores the importance of behavioral interventions, such as consistent condom use, to reduce HPV transmission among sex workers.