Lamin-ating the genome: quantitative gatekeeping of replication initiation.

Discovered in the 1970s, nuclear lamins control chromatin organization and are linked to many diseases. Zhang et al. now find that lamin A/C quantitatively constrains DNA replication initiation by limiting chromatin accessibility and sequestering proliferating cell nuclear antigen, extending lamin's long-known role in replication to the control of origin firing.