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Related Concept Videos

Viruses with RNA Genomes01:29

Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
Retrovirus Life Cycles01:10

Retrovirus Life Cycles

Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the retrovirus to...
Inhibitors Of Virion Release01:25

Inhibitors Of Virion Release

Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
Retroviruses02:33

Retroviruses

Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
DNA Bacteriophages01:26

DNA Bacteriophages

Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...

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Bacterial Artificial Chromosomes: A Functional Genomics Tool for the Study of Positive-strand RNA Viruses
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Alphavirus replicase and regulatory RNA elements in host interactions and viral vector engineering.

Dan T Boghici1,2, Danni Yong2,3, Silvia M Vidal1,2,4

  • 1Department of Human Genetics, McGill University, Montreal, Quebec, Canada.

Journal of Virology
|June 15, 2026
PubMed
Summary

Self-amplifying mRNA (sa-mRNA) platforms leverage alphavirus replicase for sustained antigen expression, enabling dose-sparing in vaccines. Further research into alphavirus biology is crucial for optimizing sa-mRNA design and applications.

Keywords:
alphavirusesgene therapyimmunotherapyinnate immunityself-amplifying RNAvaccinesviral vectors

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Area of Science:

  • Virology
  • Molecular Biology
  • Vaccinology

Background:

  • Alphavirus-derived vectors have been instrumental in understanding RNA virus replication and host interactions for decades.
  • Recent mRNA vaccine successes highlight the potential of alphavirus replicase for advanced sa-mRNA vaccine platforms.

Purpose of the Study:

  • To review key advances in alphavirus RNA synthesis and host modulation by nonstructural proteins and conserved sequence elements (CSEs).
  • To contextualize the development of alphavirus replicons for modern sa-mRNA technologies.
  • To discuss emerging engineering strategies and identify knowledge gaps in alphavirus biology for sa-mRNA design.

Main Methods:

  • Literature review and synthesis of research on alphavirus replicase function and sa-mRNA technology.
  • Analysis of conserved sequence elements (CSEs) and nonstructural protein roles in viral RNA synthesis.
  • Discussion of developmental milestones and future engineering strategies for sa-mRNA platforms.

Main Results:

  • Coordinated functions of nonstructural proteins and CSEs are critical for alphavirus RNA synthesis and host modulation.
  • Alphavirus replicons form the basis of current sa-mRNA technologies, enabling sustained antigen expression.
  • Engineering replicase functions and RNA architecture are key emerging strategies for sa-mRNA applications.

Conclusions:

  • Understanding alphavirus nonstructural proteins and CSEs is vital for optimizing sa-mRNA platforms.
  • Addressing critical gaps in alphavirus biology will accelerate rational sa-mRNA design.
  • Further investigation will enhance next-generation sa-mRNA development and fundamental alphavirus research.