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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...

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Development of a Conditional Replication System Using a Lassa Virus Glycoprotein Complex-Encoding Retroviral Vector

Manya Bakatumana Hans1,2,3, Anita Moendat Fanto1,3, Tsutomu Fukuda4,5

  • 1Department of Clinical Medicine, Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan.

International Journal of Molecular Sciences
|March 14, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a safe, BSL-2 adaptable retroviral vector for studying Lassa virus (LASV) glycoprotein complex (GPC). This system identified LASV GPC variants resistant to antiviral drugs and antibodies, aiding future therapeutic development.

Keywords:
Lassa virusglycoproteinmurine leukemia virusretroviral vector

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Area of Science:

  • Virology and Infectious Diseases
  • Molecular Biology
  • Drug Discovery

Background:

  • Lassa virus (LASV), a high-risk pathogen, necessitates Biosafety Level 4 (BSL-4) containment, limiting research accessibility due to facility scarcity.
  • Replication-defective pseudotyped retroviral vectors are utilized in Biosafety Level 2 (BSL-2) settings for assays, offering a safer alternative for studying LASV.
  • Developing accessible research platforms is crucial for advancing understanding and countermeasure development against LASV.

Purpose of the Study:

  • To establish a novel, conditionally replicating retroviral vector system for Lassa virus glycoprotein complex (GPC) research under BSL-2 conditions.
  • To utilize this system for isolating and characterizing LASV GPC variants resistant to antiviral compounds and neutralizing antibodies.
  • To provide a valuable platform for identifying mutations conferring resistance to LASV inhibitors.

Main Methods:

  • Development of a novel retroviral vector encoding LASV GPC, designed for conditional replication dependent on murine leukemia virus (MLV) Gag-Pol expression.
  • Application of the BSL-2 based conditional replication system to isolate LASV GPC variants resistant to lamellarin α 20-sulfate and a survivor-derived neutralizing antibody.
  • Amino acid substitution analysis (K125E, H13R, I403T) to identify mutations responsible for conferring resistance and affecting viral properties.

Main Results:

  • Successfully established a BSL-2 compatible retroviral vector system for studying LASV GPC.
  • Isolated lamellarin α 20-sulfate-resistant LASV GPC variants with cooperative K125E and H13R mutations, where K125E enhanced infectivity and H13R mitigated lethality.
  • Identified the I403T substitution in antibody-resistant variants, which impairs neutralizing antibody binding.

Conclusions:

  • The developed conditional replication system provides a safe and effective BSL-2 platform for LASV GPC research.
  • This platform facilitates the isolation and characterization of LASV GPC variants resistant to antiviral drugs and antibodies.
  • The identified mutations offer insights into LASV GPC-inhibitor interactions and potential resistance mechanisms.