Systematic screen for human disease genes in yeast.

Area of Science:

• Mitochondrial Biology
• Genomics
• Human Genetics

Background:

• High similarity exists between yeast and human mitochondria, enabling functional genomic studies in Saccharomyces cerevisiae to identify human disease genes.
• 102 heritable disorders are linked to defects in nuclear-encoded mitochondrial proteins, yet many mitochondrial diseases remain unexplained due to incomplete identification of relevant proteins.

Purpose of the Study:

• To systematically identify mitochondrial proteins using a functional genomic screen in yeast.
• To discover novel genes involved in mitochondrial function and biogenesis.
• To link identified yeast genes to human orthologs and associated heritable diseases.

Main Methods:

• A systematic functional screen was employed using a whole-genome pool of yeast deletion mutants.
• Three million strain fitness measurements were conducted to assess the impact of gene deletions on mitochondrial respiration.
• Human orthologs of identified yeast genes were determined using genomic map positions.

Main Results:

• The screen identified 466 genes whose deletions impaired mitochondrial respiration, with 265 of these being newly discovered.
• This approach demonstrated higher selection efficiency compared to other systematic methods, including gene expression analysis.
• Identified human orthologs were successfully linked to known heritable mitochondrial disorders.

Conclusions:

• The functional genomic screen in yeast is a powerful tool for identifying mitochondrial proteins and understanding their role in human disease.
• This study significantly expanded the catalog of known mitochondrial proteins and provided new candidates for unexplained mitochondrial disorders.
• The findings facilitate the genetic diagnosis and potential therapeutic targeting of human mitochondrial diseases.