3D genome folding in epigenetic regulation and cellular memory

Area of Science:

• Genomics
• Epigenetics
• Cell Biology

Background:

• The three-dimensional (3D) folding of the genome is intrinsically linked to the epigenetic state, which governs gene expression programs.
• While the interplay between gene expression and genome organization is context-dependent, 3D genome organization is increasingly recognized as a crucial epigenetic mechanism for reinforcing and stabilizing transcriptional states.

Purpose of the Study:

• This review explores the intricate relationship between the epigenetic state and nuclear organization.
• It investigates the interplay between transcriptional regulation and epigenetic genome folding.
• Furthermore, it examines the potential for regulatory information within genome folding to be transmitted through mitosis, contributing to cellular memory.

Main Methods:

• This review synthesizes existing research and theoretical frameworks.
• It discusses findings from studies investigating nuclear architecture and epigenetic modifications.
• The review evaluates the dynamic changes in nuclear structure during the cell cycle, particularly during mitosis.

Main Results:

• 3D genome organization acts as a critical epigenetic layer that reinforces and stabilizes gene expression.
• The transmission of regulatory information via genome folding through mitosis is an active area of research.
• Nuclear architectural remodeling during mitosis influences the maintenance of cellular states.

Conclusions:

• The 3D genome's epigenetic state is fundamental to maintaining gene expression programs.
• The potential for 3D genome organization to serve as a form of cellular memory, potentially transmitted across cell divisions, is a significant area for future investigation.
• Understanding these dynamics is key to deciphering gene regulation and cellular inheritance.