UQ neuroscientists: controlling fear by modifying DNA
For many people, fear of flying or of spiders skittering across the lounge room floor is more than just a momentary increase in heart rate and a pair of sweaty palms.
It’s a hard-core phobia that can lead to crippling anxiety, but an international team of researchers, including neuroscientists from University of Queensland’s Queensland Brain Institute (QBI), may have found a way to silence the gene that feeds this fear.
QBI senior research fellow Dr Timothy Bredy said the team had shed new light on the processes involved in loosening the grip of fear-related memories, particularly those implicated in conditions such as phobia and post-traumatic stress disorder.
Dr Bredy said they had discovered a novel mechanism of gene regulation associated with fear extinction, an inhibitory learning process thought to be critical for controlling fear when the response was no longer required.
“Rather than being static, the way genes function is incredibly dynamic and can be altered by our daily life experiences, with emotionally relevant events having a pronounced impact,” Dr Bredy said.
He said that by understanding the fundamental relationship between the way in which DNA functions without a change in the underlying sequence, future targets for therapeutic intervention in fear-related anxiety disorders could be developed.
“This may be achieved through the selective enhancement of memory for fear extinction by targeting genes that are subject to this novel mode of epigenetic regulation,” he said.
Mr Xiang Li, a PhD candidate and the study’s lead author, said fear extinction was a clear example of rapid behavioural adaptation, and that impairments in this process were critically involved in the development of fear-related anxiety disorders.
“What is most exciting is that we have revealed an epigenetic state that appears to be quite specific for fear extinction,” Mr Li said.
Dr Bredy said this was the first comprehensive analysis of how fear extinction was influenced by modifying DNA.
“It highlights the adaptive significance of experience-dependent changes in the chromatin landscape in the adult brain,” he said.
The collaborative research is being done by a team from QBI, the University of California, Irvine, and Harvard University.
The study was published in the Proceedings of the National Academy of Sciences of the United States of America.
About the Queensland Brain Institute
The Queensland Brain Institute (QBI) was established as a research institute of the University of Queensland in 2003. The institute is now operating out of a new $63 million state-of-the-art facility and houses 33 principal investigators with strong international reputations. QBI is one of the largest neuroscience institutes in the world dedicated to understanding the mechanisms underlying brain function.
Master of Neuroscience
The Master of Neuroscience at the University of Queensland is designed to provide advanced training in molecular, cellular and integrative (including behavioural) approaches to neuroscience. The program includes three core courses in cellular, cognitive behavioural and systems aspects of neuroscience and a series of laboratory rotations which provide firsthand experience in neuroscience research. The program provides a strong foundation in modern neuroscience for those wishing to pursue independent research and teaching careers in neuroscience.