We've updated our Privacy Policy to make it clearer how we use your personal data.

We use cookies to provide you with a better experience. You can read our Cookie Policy here.

Advertisement
New Technique Visualizes Gene Expression in Mouse Brains in Real-Time
News

New Technique Visualizes Gene Expression in Mouse Brains in Real-Time

New Technique Visualizes Gene Expression in Mouse Brains in Real-Time
News

New Technique Visualizes Gene Expression in Mouse Brains in Real-Time

A University of Minnesota Twin Cities-led team has developed a new technique for imaging mRNA molecules in the brains of living mice. By genetically modifying a mouse so that it produced mRNA labeled with green fluorescent proteins (shown above), the researchers were able to see when and where the mouse’s brain generated Arc mRNA. Credit: Hye Yoon Park/ University of Minnesota Twin Cities
Read time:
 

Want a FREE PDF version of This News Story?

Complete the form below and we will email you a PDF version of "New Technique Visualizes Gene Expression in Mouse Brains in Real-Time"

First Name*
Last Name*
Email Address*
Country*
Company Type*
Job Function*
Would you like to receive further email communication from Technology Networks?

Technology Networks Ltd. needs the contact information you provide to us to contact you about our products and services. You may unsubscribe from these communications at any time. For information on how to unsubscribe, as well as our privacy practices and commitment to protecting your privacy, check out our Privacy Policy

A University of Minnesota Twin Cities-led team has developed a new technique that allows scientists and engineers to, for the first time, visualize mRNA molecules in the brains of living mice. The research reveals new insights into how memories are formed and stored in the brain and could provide scientists with new information about diseases such as Alzheimer’s.


The paper is published in the Proceedings of the National Academy of Sciences of the United States of America (PNAS), a peer-reviewed, multidisciplinary, high-impact scientific journal.


There is still a lot of mystery surrounding the process of how memory is physically created and stored in the brain. It is well known that mRNA—a type of RNA involved in the creation of proteins—is produced during the process of forming and storing memories, but the technology for studying this process on the cellular level has been limited. Previous studies have often involved dissecting mice in order to examine their brains.


A team of researchers led by a University of Minnesota Twin Cities faculty member has developed a new technique that gives scientists a window into RNA synthesis in the brain of a mouse while it is still alive.


A three-dimensional view of the hippocampus CA1 region in a live mouse brain (shown above) gives researchers a window into RNA synthesis in the brain of a mouse as it generates and stores memories. Video credit: Hye Yoon Park, University of Minnesota Twin Cities


“We still know very little about memories in the brain,” explained Hye Yoon Park, an associate professor in the University of Minnesota Department of Electrical and Computer Engineering and the study’s lead author. “It’s well known that mRNA synthesis is important for memory, but it was never possible to image this in a live brain. Our work is an important contribution to this field. We now have this new technology that neurobiologists can use for various different experiments and memory tests in the future.”


The University of Minnesota-led team’s process involved genetic engineering, two-photon excitation microscopy, and optimized image processing software. By genetically modifying a mouse so that it produced mRNA labeled with green fluorescent proteins (proteins derived from a jellyfish), the researchers were able to see when and where the mouse’s brain generated Arc mRNA, the specific type of molecule they were looking for.


Because the mouse is alive, the researchers could study it for longer periods of time. Using this new process, the researchers performed two experiments on the mouse in which they were able to see in real time over a month what the neurons—or nerve cells—were doing as the mouse was forming and storing memories.


Historically, neuroscientists have theorized that certain groups of neurons in the brain fire when a memory is formed, and that those same cells fire again when that moment or event is remembered. However, in both experiments, the researchers found that different groups of neurons fired each day they triggered the memory in the mouse.


Over the course of several days after the mouse created this memory, they were able to locate a small group of cells that overlapped, or consistently generated the Arc mRNA each day, in the retrosplenial cortex (RSC) region of the brain, a group which they believe is responsible for the long-term storage of that memory.


“Our research is about memory generation and retrieval,” Park said. “If we can understand how this happens, it will be very helpful for us in understanding Alzheimer’s disease and other memory-related diseases. Maybe people with Alzheimer’s disease still store the memories somewhere—they just can’t retrieve them. So in the very long-term, perhaps this research can help us overcome these diseases.”


Reference: Lee BH, Shim JY, Moon HC, et al. Real-time visualization of mRNA synthesis during memory formation in live mice. Proc. Natl. Acad. Sci. 2022;119(27):e2117076119. doi: 10.1073/pnas.2117076119


This article has been republished from the following materials. Note: material may have been edited for length and content. For further information, please contact the cited source.

 
Advertisement