NEAT1 Found to Regulate Memory Formation

Researchers at the University of Alabama at Birmingham have found that NEAT1 has a major, previously undescribed role in memory formation. The findings were published today in Science Signaling.

"NEAT1 is a tissue-specific, non-coding RNA found in the hippocampus region of the brain. This brain region is most associated with learning and memory," said Farah Lubin, Ph.D., primary investigator of the study. "While it has some association with cancer in other parts of the body, we have discovered that, in the hippocampus, NEAT1 appears to regulate memory formation."

Lubin says that, when NEAT1 is on, or active, we do not learn as well. But when presented with an outside learning experience, it turns off, allowing the brain to learn from the outside stimulus. "NEAT1 is the brake: When it is on, we aren't learning, at least not as much as we might with it off," Lubin said. "In a younger brain, when presented with stimulus that promotes learning, NEAT1 turns off. Since one of the hallmarks of aging is a decline in memory, we wondered if NEAT1 was implicated in that decline."

One of the genes that NEAT1 acts upon is c-FOS, which is necessary for memory formation. In an aging brain, NEAT1 is on more than it is in a younger brain, interfering with the epigenetic regulation of c-FOS, which disrupts its memory functions.

Using siRNA techniques in a mouse model, Lubin's team was able to turn off NEAT1 in older mice. With NEAT1 off, the mice demonstrated normal abilities in learning and memory. The next step was to change the level of NEAT1 in younger mice, using CRISPR/dCas9 gene-activation technology. Boosting the presence of NEAT1 in younger mice caused a decline in their ability to learn and remember.

"Turning NEAT1 off in older animals boosted memory, while increasing NEAT1 in younger animals diminished memory," Lubin said. "This gives us very strong evidence that NEAT1 and its effects on the epigenetic control of c-FOS are one of the keys to memory formation. These are significant findings, for not only did we find a novel epigenetic initiator and regulator, we identified a new role for the NEAT1 non-coding RNA. This sets the stage for more research into the potential roles played by other non-coding RNAs."

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