Researchers have identified KCTD10 as a key “traffic controller” for DNA, coordinating the essential processes of replication and transcription to maintain genomic stability. During cell division, replication machinery rapidly duplicates DNA, while transcription machinery reads it to produce RNA. Collisions between these processes can cause DNA damage, double-strand breaks, and mutations that drive cancer.
KCTD10 detects potential collisions and activates the enzyme CUL3, which ubiquitinates components of the transcription machinery. This signal pauses or redirects transcription, allowing replication to proceed safely. By preventing these conflicts, KCTD10 preserves DNA integrity and reduces the risk of tumorigenesis.
When KCTD10 is lost or dysfunctional, cells experience frequent replication-transcription collisions, leading to chromosomal instability. This vulnerability may be exploited therapeutically, as KCTD10-deficient cancer cells are more sensitive to drugs targeting replication or DNA repair. KCTD10 status could thus serve as a biomarker for precision cancer treatments that exploit these weaknesses.