Comparative Genome and Transcriptome Study of the Gene Expression Difference Between Pathogenic and Environmental...

Area of Science:

• Microbiology
• Genomics
• Infectious Diseases

Background:

• Prototheca zopfii is an environmental alga causing invasive human infections (protothecosis).
• Increasing morbidity and poor prognosis in immunocompromised patients necessitate understanding protothecosis pathogenesis.
• Previous research primarily focused on strain classification, not pathogenic mechanisms.

Purpose of the Study:

• To investigate the genomic and transcriptomic profiles of Prototheca zopfii pathogenic strains.
• To identify genes and pathways contributing to the virulence and survival of pathogenic P. zopfii.
• To provide a foundation for future research into protothecosis pathogenesis.

Main Methods:

• Next-generation sequencing was used to construct the genome and transcriptome.
• Comparative analysis was performed on two pathogenic strains and one environmental strain.
• Gene expression levels were analyzed to identify significant up-regulations.

Main Results:

• Pathogenic P. zopfii strains showed significant up-regulation of genes involved in peroxisomal metabolism, including the glyoxylate cycle.
• Enhanced metabolic pathways may improve resistance to phagolysosomal environments and anaerobic survival.
• Up-regulated genes associated with adherence and penetration, similar to dermatophytes, were identified, suggesting enhanced virulence capacity.

Conclusions:

• The study provides the first comprehensive genomic and transcriptomic data for pathogenic P. zopfii strains.
• Identified metabolic and virulence-associated genes offer novel targets for understanding and potentially treating protothecosis.
• These findings lay the groundwork for future research into the pathogenesis of P. zopfii infections.