Stress-induced expression is enriched for evolutionarily young genes in diverse budding yeasts

Area of Science:

• Evolutionary biology
• Genomics
• Microbiology

Background:

• The Saccharomycotina subphylum, or budding yeasts, have evolved over 400 million years.
• These yeasts inhabit diverse environments and exhibit remarkable niche-adaptation capabilities.
• Understanding gene expression under stress is crucial for deciphering adaptation mechanisms.

Purpose of the Study:

• To investigate gene expression changes in three divergent yeast species under various stressors.
• To identify the role of gene duplication and evolutionary age in stress response.
• To elucidate the shared stress adaptation mechanisms in budding yeasts.

Main Methods:

• Comparative genomics and gene expression analysis of three yeast species under stress.
• Development of a novel gene sorting method based on evolutionary origin and duplication timing.
• Analysis of the correlation between gene evolutionary age and stress responsiveness.

Main Results:

• Duplicated and non-conserved genes showed a higher propensity for stress response compared to single-copy conserved genes.
• A significant enrichment of recently evolved genes was observed among stress-responsive genes in all studied species.
• Genes that emerged more recently in evolutionary history are key players in yeast stress adaptation.

Conclusions:

• Budding yeasts share a common mechanism for stress adaptation involving the functionalization of young genes.
• Selective pressure drives the evolution of new genes to enhance growth in adverse conditions.
• Characterizing these young genes can aid in developing robust yeast strains for biotechnological purposes.