Genome-based analysis of SFTSV causing severe encephalitis with brain lesions

Area of Science:

• Virology
• Neuroscience
• Infectious Diseases

Background:

• Encephalitis is a rare complication of severe fever with thrombocytopenia syndrome virus (SFTSV) infection.
• Limited data exist on the pathogenic mechanisms of SFTSV-associated encephalitis.

Purpose of the Study:

• To investigate the genetic and structural characteristics of SFTSV strains isolated from patients with encephalitis.
• To explore potential virulence factors contributing to SFTSV-induced encephalitis.

Main Methods:

• Whole-genome sequencing of SFTSV strains from cerebrospinal fluid (CSF) of two encephalitis patients.
• Phylogenetic analysis of SFTSV M segment.
• 3D structural modeling of glycoprotein Gn using SWISS-MODEL.

Main Results:

• Specific mutations (P98L, T665S) were identified in the M fragment of the studied SFTSV strains.
• No significant variations in glycoprotein Gn were observed compared to non-encephalitis strains.
• Phylogenetic analysis indicated high similarity between encephalitis and non-encephalitis SFTSV strains.

Conclusions:

• SFTSV virulence factors do not appear to differ between strains causing encephalitis and those that do not.
• The findings support the hypothesis that SFTSV possesses inherent neurotropic properties.