Fixing 'junk' DNA breaks can protect and treat dementia

By The Science Advisory Board staff writers

September 30, 2022 -- Fixing breaks in so-called “junk” DNA could protect people from neurological diseases and lead to earlier detection, intervention, and the development of therapeutic treatments for disorders such as dementia, Alzheimer’s disease, and Motor Neurone Disease (MND), a new study finds.

A research team from the University of Sheffield's Neuroscience Institute and Healthy Lifespan Institute in the U.K. found "junk" DNA, or noncoding DNA, is much more vulnerable to breaks from oxidative genomic damage than previously thought and this relates to the development of neurological disorders.

They found promoters are protected from oxidative damage via a process mediated by the nuclear mitotic apparatus protein NuMA, also known as NUMA1 (Nature, September 28, 2022). NuMA exhibits genomic occupancy of approximately 100 bp around transcription start sites. It binds the initiating form of RNA polymerase II, pause-release factors, and single-strand break repair (SSBR) components such as TDP1.

The binding on chromatin intensifies following oxidative damage, and TDP1 enrichment at damaged chromatin is facilitated by NuMA. Less NuMA means more oxidative damage at promoters because NuMA promotes transcription by limiting the polyADP-ribosylation of RNA polymerase II, increasing its availability and release from pausing at promoters.

The researchers were able to metabolically label nascent RNA to identify genes that depend on NuMA for transcription, including immediate to early response genes. However, by coupling NuMA-deficient cells with a mutant that mediates binding to SSBR, the cells' defects were restored. The findings demonstrate the importance of oxidative DNA damage repair at gene regulatory elements, according to the authors.


Copyright © 2022 scienceboard.net
 

Create an Account

Already have an account? Sign in Here

To access all ScienceBoard content create a free account now:



Email Address:  

First Name:

Last Name:

 
I have read and agree to the privacy policy and terms of service and wish to opt-in for ScienceBoard.net.

Email Preferences



Letter from the Editor Please send me twice-weekly roundups of all the latest life research and industry news.
SAB Announcements Please send me the latest announcements from The Science Advisory Board and their partners.
Spotlight Receive notifications about new content, services, or educational resources designed to help you sharpen your skills and grow professionally.