ORC5 (Origin Recognition Complex Subunit 5): ORC5 is a protein that is part of the origin recognition complex, a critical component in the initiation of DNA replication in eukaryotic cells. It plays an essential role in ensuring accurate DNA replication, which is vital for maintaining genomic integrity. Dysfunction in ORC5 or the replication initiation process can lead to genomic instability, a characteristic of cancer cells, and contribute to developmental disorders related to impaired cell proliferation.