Researchers Mapped Endogenous Protein-DNA Intermediates
A new sequencing method provides a detailed view of DNA adducts without the need for toxic stabilizers.
Updated on Oct. 2, 2026 in Biotech
Scientists developed pDAIP-seq to map endogenous protein-DNA covalent intermediates within human cells. The method allows for the observation of natural DNA breaks caused by topoisomerase complexes without relying on drugs that typically alter genomic distribution.
Why it matters
Previous profiling techniques required the use of camptothecin to stabilize protein-DNA adducts, which artificially skewed results. This new approach provides a more accurate view of genomic stability by capturing natural intermediates as they exist in the cell.
The pDAIP-seq method utilizes protein-DNA adduct immunoprecipitation followed by sequencing to map intermediates. It successfully identifies endogenous TOP1cc, TOP2cc, TOP3cc, and SPO11-DNA adducts in human cells and mouse testis models.
The players
TOP1cc
This is a covalent complex formed between the topoisomerase enzyme and DNA during the cell cycle.
pDAIP-seq
This is a newly developed sequencing technology designed to map endogenous protein-DNA covalent intermediates.
The details
The method revealed that endogenous TOP1cc acts as a significant source of spontaneous DNA breaks. Researchers observed that transcriptional suppression lowers global TOP1cc levels, while TOP2A depletion leads to an increase in these intermediates.
Timeline
October 2, 2026: The research was published.
The Big Picture
This discovery extends the human genome project's mapping initiatives by adding detailed resolution of protein-DNA covalent intermediates. The method allows scientists to look past legacy hypotheses to understand the true architecture of spontaneous genomic breaks.
This sequencing method improves the precision of future clinical research regarding genomic stability and DNA repair mechanisms. Researchers and biotech developers can utilize this tool to better understand how cellular processes contribute to genetic mutations.
The takeaway
This method offers a cleaner way to study the fundamental architecture of DNA integrity by removing external chemicals that interfere with natural biological signals. Researchers can now better distinguish between endogenous cellular processes and drug-induced artifacts.
Further reading
Learn more about the latest innovations in Biotech.
Source note: This article includes information reported by Biorxiv.
