Development of a Universal Cloning System for Reverse Genetics of Human Enteroviruses.

Area of Science:

• Virology and Molecular Biology
• Infectious Diseases

Background:

• Enteroviruses (EVs) are a diverse group of viruses causing severe human diseases.
• The genetic divergence and emergence of EVs pose significant public health challenges.
• Existing methods for reverse genetics (RG) are often inefficient for highly divergent EV strains.

Purpose of the Study:

• To develop an efficient and universal cloning system for the reverse genetics of highly divergent human enteroviruses.
• To simplify the cloning process, enabling rapid manipulation of various EV types.

Main Methods:

• Enhanced template-switching method for whole-genome cDNA template generation.
• Designed universal primers for simultaneous cloning and rapid amplification of cDNA ends (RACE)-PCR.
• Streamlined cloning steps to be completed within a single day.

Main Results:

• Successfully generated a versatile human EV whole-genome cDNA template.
• Verified an efficient universal cloning system enabling RG of a broad range of human EVs (EV-A, EV-B, EV-C, and EV-D).
• Recovered EVs with viral titers and phenotypes comparable to wild-type strains.

Conclusions:

• The developed rapid and straightforward universal EV cloning strategy facilitates the study of molecular characteristics and pathogenesis.
• This system aids in the development of genetic vaccines and delivery tools.
• It supports antiviral screening and understanding of EV evolution.