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All-optical Mechanobiology Interrogation of Yes-associated Protein in Human Cancer and Normal Cells using a Multi-functional System

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Published on: December 20, 2021

Nonrandom AP site distribution in highly proliferative cells.

Paul D Chastain¹, Jun Nakamura, James Swenberg

¹Department of Pathology and Laboratory, School of Medicine, University of North Carolina, Chapel Hill, North Carolina 27599-7525, USA. pchastai@med.unc.edu

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology

|October 28, 2006

Summary

Oxidative DNA damage from reactive oxygen species (ROS) forms apurinic/apyrimidinic (AP) sites. These AP sites are not randomly distributed, suggesting specific genomic regions are more vulnerable, impacting disease development.

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Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

Reactive oxygen species (ROS) cause oxidative DNA damage, including 8-oxo-guanine and apurinic/apyrimidinic (AP) sites.
This DNA damage is implicated in age-related and chronic diseases.
A basal level of 70,000–100,000 AP sites per genome exists.

Purpose of the Study:

To investigate the distribution of AP sites within DNA fibers.
To determine if AP site formation is random or nonrandom in the genome.

Main Methods:

Electron microscopy was used to visualize DNA fibers.
Analysis was performed on isolated DNA fibers from calf thymus and HeLa cell cultures.

Main Results:

AP sites were not uniformly distributed across all DNA fibers.
A small fraction of DNA fibers contained a high concentration of AP sites (10 to >30 sites in a 6 kb region).
AP sites formed nonrandom clusters within specific DNA regions.

Conclusions:

Genomic sites exhibit differential vulnerability to ROS-induced DNA damage, potentially due to local chromatin structure.
The distribution pattern of AP sites, not just their total number, may be crucial for understanding ROS-related disease pathogenesis.
Nonrandom AP site formation suggests targeted genomic regions are affected, influencing disease outcomes.