Comparing genomic expression patterns across species identifies shared transcriptional profile in aging

Area of Science:

• Comparative genomics
• Systems biology
• Gene expression analysis

Background:

• Understanding conserved biological processes across diverse species is crucial for deciphering fundamental life mechanisms.
• Gene expression patterns offer insights into cellular functions and regulatory networks.

Purpose of the Study:

• To develop and demonstrate a method for systematic, genome-wide comparative analysis of gene expression data across different organisms.
• To identify conserved gene expression programs and their biological relevance in processes like aging.

Main Methods:

• Genome-wide comparative analysis of DNA microarray data.
• Identification of analogous gene expression programs in orthologous genes.
• Correlation of conserved subpatterns with Gene Ontology categories.

Main Results:

• Identified shared adult-onset gene expression programs in Caenorhabditis elegans and Drosophila melanogaster related to mitochondrial metabolism, DNA repair, and catabolism.
• Demonstrated conserved transcriptional signatures in aging, larval development, embryogenesis, gametogenesis, and mRNA degradation.
• Found that most identified expression changes occurred early in adulthood.

Conclusions:

• The developed method enables systematic comparison of gene expression patterns across species.
• Conserved gene expression programs highlight fundamental biological processes shared between distantly related organisms.
• This approach is applicable to a wide range of biological processes beyond aging.