Expression profiling and functional annotation of noncoding genes across 11 distinct organs in rat development

Area of Science:

• Genomics and Molecular Biology
• Bioinformatics
• Developmental Biology

Background:

• Noncoding RNAs (ncRNAs) possess crucial regulatory functions, but their roles are poorly understood due to limited functional annotations.
• Systematic analysis of ncRNA expression and function is essential for advancing biological research and drug development.

Purpose of the Study:

• To comprehensively analyze the expression profiles of 3,458 rat noncoding genes across 11 organs and four developmental stages.
• To infer the biological functions of ncRNAs by constructing co-expression networks with protein-coding genes.
• To investigate organ-, age-, and sex-specific regulatory roles of ncRNAs.

Main Methods:

• RNA sequencing of rat tissues from the Rat BodyMap project, covering 11 organs and four developmental stages (juvenile, adolescent, adult, aged) in both sexes.
• Differential expression analysis of noncoding genes (DEnGs) across various conditions.
• Construction of protein-coding and noncoding gene co-expression networks.
• Functional annotation and pathway analysis using DAVID and network visualization.

Main Results:

• Noncoding genes exhibit functional enrichment in pathways similar to protein-coding genes.
• Age-related modules are enriched with terms related to immune system development.
• Sex-related modules are enriched with terms related to sexual reproduction.
• Co-expression networks revealed interactions and regulatory relationships between noncoding and protein-coding genes.

Conclusions:

• This study provides valuable insights into the functional roles of ncRNAs in organ development, aging, and sex differentiation.
• The findings facilitate a deeper understanding of ncRNA-mediated regulatory events.
• This research can contribute to developing improved preclinical models for drug discovery and translational medicine.