The human origin recognition complex (ORC) is essential for pre-RC assembly, mitosis and maintenance of nuclear structure

Hsiang-Chen Chou, Kuhulika Bhalla, Osama-El Demerdesh, Olaf Klingbeil, Kaarina Hanington, Sergey Aganezov, Peter Andrews, Habeeb Alsudani, Kenneth Chang, Christopher R. Vakoc, Michael C. Schatz, Richard W. McCombie & Bruce Stillman
The origin recognition complex (ORC) cooperates with CDC6, MCM2-7, and CDT1 to form pre-RC complexes at origins of DNA replication. Here, using tiling-sgRNA CRISPR screens, we report that each subunit of ORC and CDC6 is essential in human cells. Using an auxin-inducible degradation system, we created stable cell lines capable of ablating ORC2 rapidly, revealing multiple cell division cycle phenotypes. The primary defects in the absence of ORC2 were cells encountering difficulty in initiating DNA...
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