Chromatin accessibility dynamics across C. elegans development and ageing

Area of Science:

• Genomics
• Developmental Biology
• Aging Research

Background:

• Understanding transcriptional regulation is crucial for deciphering development and physiology.
• Global identification of regulatory elements is essential for mapping gene control networks.

Purpose of the Study:

• To create the first comprehensive map of regulatory elements across the entire lifespan of an animal model.
• To characterize the function and dynamics of these elements during development and aging.

Main Methods:

• Utilized nuclear transcription profiles to identify accessible regulatory elements in Caenorhabditis elegans.
• Defined and classified protein-coding promoters and putative enhancers based on transcriptional activity.
• Analyzed changes in element accessibility throughout development and aging.

Main Results:

• Identified 42,245 accessible regulatory elements in C. elegans.
• Defined 15,714 protein-coding promoters and 19,231 putative enhancers, demonstrating orientation-independent transcription.
• Discovered over 1000 promoters producing antisense transcripts, indicating a novel regulatory mechanism.
• Observed dynamic changes in element accessibility linked to specific developmental and physiological processes.

Conclusions:

• The generated map provides a foundational resource for studying transcriptional control of development and aging.
• Regulatory element accessibility is dynamic and plays a key role in life processes.
• The findings offer new insights into gene regulation, including antisense transcription.