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Prof. San Miguel and Her Colleagues Have Developed a New Way of Studying Neural Degeneration

This is a slightly modified version of an article written by Matt Shipman, Research Lead in University Communications.

Professor Adriana San Miguel
Prof. Adriana San Miguel

Professor Adriana San Miguel and her colleagues have demonstrated the utility of artificial intelligence (AI) in identifying and categorizing neural degeneration in a model organism. The tool uses deep learning, a form of AI, and should facilitate and expedite research into neural degeneration.

“Researchers want to study the mechanisms that drive neural degeneration, with the long-term goal of finding ways to slow or prevent the degeneration associated with age or disease,” says Prof. San Miguel, corresponding author of a paper on the work. “Our work here shows that deep learning can accurately identify physical symptoms of neural degeneration; can do it more quickly than humans; and can distinguish between neural degeneration caused by different factors.

“Having tools that allow us to identify these patterns of neural degeneration will help us determine the role that different genes play in these processes,” San Miguel says. “It will also help us evaluate the effect of various pharmaceutical interventions on neural degeneration in the model organism. This is one way we can identify promising candidates for therapeutic drugs to address neurological disorders.”

For this study, researchers focused on C. elegans, or roundworm, which is a model organism widely used to study aging and the development of the nervous system. Specifically, the researchers focused on PVD neurons, which are nerve cells that can detect both touch and temperature. The researchers chose the PVD neuron because it is found throughout the nervous system of C. elegans and it is known to degenerate due to aging.

c elegans round worm
Adult C. elegans on a culture plate. Photo courtesy of Dr. Adriana San Miguel.

Roundworms are tiny and transparent – meaning that it is possible to see their nervous systems while they are still alive. Traditionally, identifying degeneration in C. elegans neurons requires researchers to look for microscopic changes in the cell, such as the appearance of bubbles that form on parts of individual neurons. Researchers can analyze the extent of neural degeneration by tracking the size, number and location of these bubbles.

“Counting these bubbles is a time-consuming and labor-intensive process,” says Dr. Kevin Flores, co-author of the study and an assistant professor of mathematics at NC State. “We’ve demonstrated that we can collect all of the relevant data from an image in a matter of seconds, by combining the power of deep-learning with the advanced speed of so-called GPU computing. This enables a much faster quantitative assessment of neuronal degeneration than traditional techniques.”

In addition to monitoring the effects of age on neural degeneration, the researchers also examined the effects of “cold shock,” or prolonged exposure to low temperatures. The researchers were surprised to learn that cold shock could also induce neural degeneration.

“We also found that neural degeneration caused by cold shock had a different pattern of bubbles than the degeneration caused by aging,” San Miguel says. “It is difficult or impossible to distinguish the difference with the naked eye, but the deep learning program found it consistently.

“This work tells us that deep learning tools are able to spot patterns we may be missing – and we may be just scratching the surface of their utility in advancing our understanding of neural degeneration.”

Prof. San Miguel is a Chancellor’s Faculty Excellence Program cluster hire in Synthetic and Systems Biology. Her research focuses on developing experimental platforms that enable high-throughput automated extraction of biological data, mainly from images of subcellular anatomical features in a live organism. She received her B.S. in chemical engineering from the Monterrey Institute of Technology and Higher Education and her Ph.D. in chemical engineering from the Georgia Institute of Technology.

The paper, “Deep learning-enabled analysis reveals distinct neuronal phenotypes induced by aging and cold-shock,” is published in the journal BMC Biology. First author of the paper is Dr. Sahand Saberi-Bosari, a recent Ph.D. graduate from Prof. San Miguel’s research group.

The work was done with support from the National Institutes of Health, under grants R00AG046911 and R21AG059099; and from the National Science Foundation, under grant IOS1838314.