Is the Bombali virus pathogenic in humans?

Area of Science:

• Virology
• Bioinformatics
• Molecular Biology

Background:

• The pathogenicity of the novel Bombali virus in humans is currently unknown.
• Previous studies identified specificity determining positions (SDPs) differentiating pathogenic from non-pathogenic Ebolaviruses.

Purpose of the Study:

• To investigate the potential human pathogenicity of Bombali virus.
• To analyze Bombali virus proteins at SDPs that distinguish human pathogenic Ebolaviruses from Reston virus.

Main Methods:

• Comparative analysis of Ebolavirus genomes, including 1408 sequences.
• Identification and refinement of 166 specificity determining positions (SDPs).
• Amino acid sequence comparison of Bombali virus proteins at critical SDPs.

Main Results:

• Bombali virus shared the majority of amino acids (63.25%) with human pathogenic Ebolaviruses at SDPs.
• However, Bombali virus exhibited Reston virus-like amino acids at two critical VP24 SDPs (M136L, R139S), potentially affecting karyopherin interaction.
• No Bombali virus disease outbreaks have been reported, despite its isolation from fruit bats and detection of anti-Ebolavirus antibodies in humans.

Conclusions:

• The amino acid profile at critical SDPs suggests Bombali virus may not be pathogenic in humans.
• The findings support the hypothesis that Bombali virus poses a limited risk to human health.
• Further research is warranted to fully elucidate Bombali virus's zoonotic potential.