RNase HII-C Activators

RNase HII-C Activators can be understood as chemicals that indirectly influence the activity of RNase HII-C, also known as RNASEH2C, a protein involved in the removal of RNA-DNA hybrids, critical for maintaining genome stability. These compounds generally function by causing replication stress or DNA damage, thereby increasing the formation of RNA-DNA hybrids, which RNASEH2C is involved in resolving. For instance, hydroxyurea and aphidicolin can induce replication stress, thereby leading to an increase in RNA-DNA hybrids. Similarly, 5-fluorouracil, gemcitabine, azidothymidine, tenofovir, and fludarabine, by getting incorporated into DNA, can cause disruption in the DNA structure and replication stress, thereby potentially increasing the formation of RNA-DNA hybrids.

Moreover, methotrexate, by inhibiting folate metabolism, can lead to dNTP pool imbalance, which can increase RNA-DNA hybrid formation. Similarly, etoposide, cisplatin, doxorubicin, and camptothecin, by causing DNA damage, can potentially increase RNA-DNA hybrid formation. Therefore, while none of these chemicals directly activate RNASEH2C, they can indirectly influence its activity by increasing the formation of RNA-DNA hybrids, which RNASEH2C is involved in resolving.