Variation in the glycoprotein and VP35 genes of Marburg virus strains

Virology
A SanchezHeinz Feldmann

Abstract

Marburg virus, the prototype of the family Filoviridae, differs genetically, serologically, and morphologically from Ebola viruses. To better define the genetic variation within the species, VP35 and glycoprotein (GP) genes of representative human isolates from four known episodes of Marburg virus hemorrhagic fever were analyzed. The percentage nucleotide differences in the GP gene coding regions of Marburg viruses (0.1-21%) was nearly equal to the percentage amino acid changes (0-23%), while the percentage nucleotide differences in VP35 coding regions (0.3-20.9%) were higher than the percentage amino acid changes (0.9-6.1%), indicating a greater number of nonsynonymous changes occurring in the GP gene. The higher variation in the GP gene and the corresponding protein, especially those changes in the variable middle region of the GP, suggests that the variability may be the result of responses to natural host pressures. Analysis of the GP gene open reading frame shows a nonrandom distribution of nonsynonymous mutations that may indicate positive Darwinian selection is operating within the variable region. A heptad repeat region and an adjoining predicted fusion peptide are found in the C-terminal third of Marburg virus GPs, as ...Continue Reading

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