A transcriptional cofactor regulatory network for the C. elegans intestine

Area of Science:

• Molecular Biology
• Genetics
• Developmental Biology

Background:

• Gene expression is regulated by transcription factors (TFs) and chromatin modifiers/transcriptional cofactors (CFs).
• Tissue-specific gene expression is crucial for multicellular organism development and function.
• The role of CFs in differential gene expression across tissues is less understood than that of TFs.

Purpose of the Study:

• To investigate the specific contributions of CFs to gene regulation in the Caenorhabditis elegans intestine.
• To identify regulatory interactions mediated by CFs in the intestinal context.
• To provide a resource for studying CF function in vivo.

Main Methods:

• Genome-wide annotation of 366 CFs in C. elegans.
• Assembly of a library of 335 RNA interference (RNAi) clones targeting CFs.
• Analysis of CF depletion effects on 19 fluorescent transcriptional reporters in the C. elegans intestine.
• Identification of regulatory interactions through RNAi screening.

Main Results:

• Identified 216 regulatory interactions between CFs and intestinal promoters.
• Demonstrated that distinct CFs target different promoters.
• Found that both essential and intestine-specific CFs significantly impact promoter activity.
• Observed diverse promoter targets among components of the same CF complex.
• Showed that previously known acdh-1 promoter activation involves different CFs and TFs.

Conclusions:

• CFs exhibit specific, rather than ubiquitous, roles at intestinal promoters.
• CFs contribute to tissue-specific gene regulation in the C. elegans intestine.
• The study provides a valuable RNAi resource for reverse genetic screens of CFs in the intestine.