C15orf42 Inhibitors

TOPBP1 interacting checkpoint and replication regulator (TICRR), also known as Treslin in humans, is a protein that plays a critical role in the initiation of DNA replication and in the cellular response to DNA damage. TICRR/Treslin is encoded by the TICRR gene and is essential for the proper progression of the S phase of the cell cycle.During the initiation of DNA replication, TICRR associates with the protein TOPBP1 (topoisomerase IIβ binding protein 1), which is a key activator of the ATR (ataxia telangiectasia and Rad3 related) kinase. This interaction is crucial for the phosphorylation and subsequent activation of cell division cycle 45 (CDC45) and the GINS complex, proteins that are integral to the formation of the replicative helicase complex. By facilitating the assembly of this complex, TICRR ensures that replication origins are properly activated, allowing for the unwinding of DNA and the recruitment of DNA polymerases for replication synthesis.

In addition to its role in replication, TICRR is also implicated in the DNA damage response. Upon the occurrence of DNA damage, the ATR kinase is activated, initiating a signaling cascade that leads to cell cycle arrest and DNA repair. TICRR, through its interaction with TOPBP1, is thought to contribute to the regulation of this checkpoint response, ensuring that cells do not proceed through the cell cycle with damaged DNA.Mutations or alterations in the expression of TICRR can lead to genomic instability, a hallmark of many cancers. As such, TICRR is of interest in cancer biology, with potential implications as a biomarker for cancer prognosis. Understanding the precise mechanisms by which TICRR regulates DNA replication and the checkpoint response is critical for elucidating its role in maintaining genomic integrity and preventing tumorigenesis.