Conserved RNA secondary structures in Picornaviridae genomes

Area of Science:

• Virology
• Molecular Biology
• Bioinformatics

Background:

• The family Picornaviridae includes significant human and animal pathogens.
• Picornavirus genomes are single-stranded positive-sense RNA (+RNA) encoding viral proteins and regulatory elements.
• Internal ribosomal entry site (IRES) elements are critical for cap-independent translation initiation.

Purpose of the Study:

• To conduct a comprehensive computational survey of complete genomic RNAs within the Picornaviridae family.
• To perform a detailed comparative analysis of conserved structural elements across seven picornavirus genera.
• To identify novel functional RNA elements, including potential cis-acting replication elements.

Main Methods:

• Computational analysis of complete genomic RNA sequences from seven Picornaviridae genera.
• Comparative analysis of RNA secondary structures, focusing on conserved elements.
• Identification and characterization of potential cis-acting replication elements.

Main Results:

• Conserved regions within the IRES element are smaller than previously reported when analyzed at single base-pair resolution.
• Significant conserved structural elements were identified within the coding regions of picornavirus genomes.
• Potential cis-acting replication elements were identified in four genera where they were not previously reported.

Conclusions:

• Picornavirus genomic RNA harbors conserved structural elements beyond the IRES, including within coding regions.
• The study refines the understanding of conserved IRES structures, highlighting smaller conserved sections.
• Novel cis-acting replication elements were discovered, expanding the knowledge of viral RNA replication mechanisms.