Genetic 'hotspots' that speed up and slow down brain aging could provide
new targets for Alzheimer's drugs

Date:
April 5, 2022
Source:
University of Southern California
Summary:
Researchers have discovered 15 'hotspots' in the genome that
either speed up brain aging or slow it down -- a finding that
could provide new drug targets to resist Alzheimer's disease and
other degenerative brain disorders, as well as developmental delays.



FULL STORY ========================================================================== Researchers from a USC-led consortium have discovered 15 "hotspots" in
the genome that either speed up brain aging or slow it down -- a finding
that could provide new drug targets to resist Alzheimer's disease and
other degenerative brain disorders, as well as developmental delays.


==========================================================================
The research appears online today inNature Neuroscience.

"The big game-changer here is discovering locations on the chromosome
that speed up or slow down brain aging in worldwide populations. These
can quickly become new drug targets," said Paul Thompson of USC, a
lead author on the study and the co-founder and director of the ENIGMA Consortium. "Through our AI4AD (Artificial Intelligence for Alzheimer's Disease) initiative we even have a genome-guided drug repurposing program
to target these and find new and existing drugs that help us age better." ENIGMA is working group based at USC that is exploring a vast trove
of brain data and has published some of the largest-ever neuroimaging
studies of schizophrenia, major depression, bipolar disorder, epilepsy, Parkinson's disease, and even HIV infection.

To discover the hotspots, or genomic loci, more than 200 ENIGMA-member scientists from all over the world looked for people whose brains were
scanned twice with MRI. The scans provided a measure of how fast their
brains were gaining or losing tissue in regions that control memory,
emotion and analytical thinking.

A million markers screened After computing brain tissue change rates
in 15,000 people of all ages, researchers screened a million markers in
their genomes to detect 15 genomic loci -- specific, physical locations
of genes or other DNA sequences on a chromosome -- that were speeding
up brain tissue changes.



========================================================================== These loci included some well-known Alzheimer's risk genes, such as
APOE, and some novel ones, Thompson said. The researchers also found
overlap with genes involved with depression, schizophrenia and cognitive functioning.

"Some of these genetic variants affect the growth rates of brain
substructures in childhood, while others affect the speed of brain
tissue loss in older adulthood," said co-author Neda Jahanshad, an
associate professor of neurology at the Keck School of Medicine of
USC. "The different parts of the brain have specific genes associated
with their rates of change." Thompson added, "You can see that APOE
-- the famous Alzheimer's gene -- hits a couple of brain structures
adversely -- the hippocampus and amygdala -- which also makes sense as
they are the brain regions most vulnerable to Alzheimer's and it seems
to speed tissue loss there specifically." ENIGMA also has international projects studying childhood brain disorders - - from Tourette syndrome
and autism to epilepsy. The new list of genes that slow down or speed up
brain growth in children provides new leads to pursue in these disorders
as well, the researchers said.

About this study In addition to Thompson and Jahanshad, other USC
scientists involved in the study included Sophia Thomopoulos, Joanna
Bright, Leila Nabulsi, Linda Ding and Alyssa Zhu, all from the USC Mark
and Mary Stevens Neuroimaging and Informatics Institute. For a full list
of authors, see the published study.

The study was supported with funding from the National Institutes
of Health, including the National Institute on Aging (U01AG068057,
R01AG058854, R01AG059874), the National Institute of Mental Health (R01MH117601), the National Institute of Biomedical Imaging and
Bioengineering (P41 EB015922), and a Zenith Grant (ZEN-20-644609) from
the Alzheimer's Association.


========================================================================== Story Source: Materials provided
by University_of_Southern_California. Original written by Leigh
Hopper. Note: Content may be edited for style and length.


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DOI: 10.1038/s41593-022-01042-4 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2022/04/220405171804.htm

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