Where and when to start: Regulating DNA replication origin activity in eukaryotic genomes.

Area of Science:

• Molecular Biology
• Genomics
• Epigenetics

Background:

• Eukaryotic genomes possess numerous potential DNA replication origins.
• Only a subset of these origins is activated during S-phase for DNA synthesis initiation.
• A definitive 'identity code' for replication origins remains elusive.

Approach:

• Review of genetic and epigenetic features of replication origins in yeast and metazoans.
• Highlighting recent findings on origin usage flexibility.
• Connecting origin usage to broader cellular processes.

Key Points:

• Replication origins are selected stochastically during S-phase.
• Origin identification lacks a comprehensive sequence or structural code.
• Features include nucleotide sequences, DNA structure, chromatin, and 3D genome architecture.

Conclusions:

• Origin usage flexibility impacts nuclear organization and cell growth.
• Replication origin selection is crucial for differentiation and genome stability.
• Further research is needed to fully elucidate the origin 'identity code'.