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Related Concept Videos

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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...
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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’...
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A Primary Neuron Culture System for the Study of Herpes Simplex Virus Latency and Reactivation
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Replication-Competent Controlled Herpes Simplex Virus.

David C Bloom1, Joyce Feller1, Peterjon McAnany1

  • 1Department of Molecular Genetics and Microbiology, University of Florida College of Medicine, Gainesville, Florida, USA.

Journal of Virology
|August 14, 2015
PubMed
Summary
This summary is machine-generated.

A novel herpes simplex virus 1 (HSV-1) vector, HSV-GS3, uses a dual-control gene switch for replication. This controlled virus replicates efficiently only when activated by heat and antiprogestin, offering enhanced safety for potential vaccines and therapies.

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Area of Science:

  • Virology
  • Molecular Biology
  • Gene Therapy

Background:

  • Alphaherpesviruses are explored as vectors for vaccines and oncolytic therapies.
  • Traditional vectors use attenuating mutations, limiting efficacy and immune presentation.
  • A novel approach is needed for safer, more effective viral vectors.

Purpose of the Study:

  • To develop and characterize a replication-competent, controlled herpes simplex virus 1 (HSV-1) vector.
  • To ensure vector safety through stringent regulation of replication-essential genes.
  • To evaluate the potential of this novel vector for therapeutic applications.

Main Methods:

  • Engineered HSV-1 (strain 17syn+) with replication-essential ICP4 and ICP8 genes under a dual-responsive gene switch.
  • The gene switch is activated by antiprogestins (mifepristone, ulipristal) and a heat shock promoter.
  • Replication efficiency was assessed using single-step growth experiments, viral DNA quantification, and gene transcript analysis in cell lines and a mouse model.

Main Results:

  • Recombinant virus HSV-GS3 replication is strictly dependent on combined heat and antiprogestin treatment.
  • HSV-GS3 replicates with efficiency comparable to wild-type HSV-1 upon activation.
  • Minimal to no replication occurred without activating treatment or with only heat or antiprogestin exposure.
  • Findings were consistent across cell cultures and a mouse footpad infection model.

Conclusions:

  • HSV-GS3 represents a novel class of replication-competent controlled vectors.
  • Dual regulation by heat and antiprogestin ensures stringent control over viral replication.
  • This controlled vector may offer improved safety and efficacy over conventional attenuated HSV vectors for vaccines and oncolytic therapies.