Shaping the genome via lengthwise compaction, phase separation, and lamina adhesion

Area of Science:

• Genomics
• Computational Biology
• Biophysics

Background:

• Genome structure and biological function are intrinsically linked.
• Physical manipulation of the genome by proteins is essential for its organization.
• Understanding the forces governing genome organization is crucial.

Purpose of the Study:

• To investigate the consequences of physical forces on genome organization.
• To develop a coarse-grained polymer model of the genome.
• To elucidate how different interaction classes contribute to genome architecture.

Main Methods:

• Developed a coarse-grained polymer model of the genome.
• Incorporated three classes of interactions: lengthwise compaction, self-adhesion of similar genomic segments, and adhesion to the nuclear lamina.
• Analyzed how the interplay of these interactions recapitulates observed genome architectures.

Main Results:

• The model successfully recapitulated architectural variants observed across the tree of life.
• Demonstrated that an interplay of the three interaction types drives predictable changes in global genome architecture.
• The model generates testable predictions regarding genome organization.

Conclusions:

• The three modeled interaction classes sufficiently represent protein-driven genome organization.
• Precise in vivo control over these interactions is key to regulating genome architecture.
• The model provides a framework for understanding genome folding and its functional implications.