Multiplex degenerate PCR coupled with an oligo sorbent array for human endogenous retrovirus expression profiling

Area of Science:

• Molecular biology
• Oncology
• Genomics

Background:

• Human endogenous retroviruses (HERVs) are remnants of ancient retroviral infections integrated into the human genome.
• HERV expression is observed in various tissues, including germ cells, embryonic tissues, and notably, neoplastic tissues.
• The detection of HERV expression patterns may offer valuable insights for cancer diagnosis.

Purpose of the Study:

• To develop a quantitative assay for detecting and analyzing the expression of multiple human endogenous retrovirus (HERV) families.
• To assess the utility of HERV expression analysis in cancer diagnosis and tumor phenotyping.

Main Methods:

• A quantitative assay was developed, integrating multiplex degenerate PCR (MD-PCR) amplification targeting conserved pol genes with a colorimetric Oligo Sorbent Array (OLISA).
• Primers and probes were designed for nine selected HERV families, optimizing for efficient amplification and balanced co-amplification.
• Critical parameters for MD-PCR reliability, including primer degeneracy, relative primer concentration, and total primer amount, were analyzed.

Main Results:

• The study identified key parameters influencing MD-PCR reliability, ensuring consistent amplification and dose-effect relationships.
• Analysis of tumoral versus normal tissues indicated a potential correlation between HERV expression and tissue type.
• The developed assay demonstrated the capacity for simultaneous detection of multiple HERV families.

Conclusions:

• The developed quantitative assay combining MD-PCR and OLISA is effective for detecting HERV family expression.
• HERV expression profiling holds promise as a tool for cancer diagnosis and tumor phenotyping.
• Optimization of MD-PCR parameters is crucial for reliable quantification of HERV elements.