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Lethal Alleles

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Genomic differences between guinea pig lethal and nonlethal Marburg virus variants.

Loreen L Lofts¹, M Sofi Ibrahim, Diane L Negley

¹Viral Pathogenesis and Immunology Branch, Virology Division, US Army Medical Research Institute for Infectious Diseases, Frederick, MD 21702, USA. loreen.lofts@us.army.mil

The Journal of Infectious Diseases

|December 6, 2007

Summary

Marburg virus (MARV) genome sequencing revealed few genetic differences between highly lethal and less virulent strains. Key mutations in matrix protein VP40 and RNA-dependent RNA polymerase (L) explain virulence variations.

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Area of Science:

Virology
Genomics
Molecular Biology

Background:

Marburg virus (MARV) causes severe hemorrhagic fever.
Understanding genetic determinants of MARV virulence is crucial for disease control.

Purpose of the Study:

To identify genetic differences between two closely related MARV variants with distinct virulence in guinea pigs.
To pinpoint specific mutations responsible for observed differences in pathogenicity.

Main Methods:

Whole-genome sequencing of two MARV variants (Lake Victoria marburgvirus, strain Musoke).
Comparative analysis of coding and noncoding RNA regions.
Identification of amino acid-altering mutations and silent codon changes.

Main Results:

Only a few genomic regions differentiated the two MARV variants.
Four amino acid-changing mutations were found: one in VP40 and three in the L gene.
Mutations in VP40 occurred in a nonconserved loop, while L gene mutations were near a conserved polymerase motif.

Conclusions:

Limited genetic variations underlie significant virulence differences in MARV.
Specific mutations in VP40 and L genes are likely responsible for altered pathogenicity.
Further research into these specific mutations can inform MARV therapeutics.