Hypertranscription and replication stress in cancer

Area of Science:

• Molecular Biology
• Cancer Biology
• Genomics

Background:

• Replication stress arises from impediments to DNA replication fork progression.
• Ongoing transcription can lead to transcription-replication conflicts, a source of replication stress.
• Oncogenic signaling often increases global transcription, a phenomenon known as hypertranscription.

Purpose of the Study:

• To elucidate the mechanistic understanding of hypertranscription-induced replication stress.
• To discuss the cellular responses to hypertranscription-induced replication stress.
• To contextualize these findings within oncogene activity and targeted cancer therapies.

Main Methods:

• Review of recent studies on oncogenes (e.g., RAS) and BET bromodomain inhibitors.
• Analysis of mechanisms linking hypertranscription to R-loop accumulation and transcription-replication conflicts.
• Discussion of the activation of replication stress responses.

Main Results:

• Oncogenes and BET inhibitors promote global transcription (hypertranscription).
• Hypertranscription leads to R-loop accumulation and transcription-replication conflicts.
• These events activate cellular replication stress responses.

Conclusions:

• Hypertranscription is a significant, yet understudied, driver of replication stress and genomic instability in cancer.
• Understanding hypertranscription-induced replication stress is crucial for developing novel cancer therapies.
• Targeting hypertranscription or its consequences may offer new therapeutic strategies.