Genome complexity: non-coding RNA controls memory (Introduction)

by David Turell , Tuesday, July 02, 2019, 19:40 (1753 days ago) @ David Turell

A complex addition to our knowledge of how memory is created/controlled:

https://medicalxpress.com/news/2019-07-noncoding-rna-important-role-memory.html

"RNA is the messenger that transmits the code to individual cells in the form of proteins.

" However, there are also non-coding RNAs, which do carry instructions to a cell without coding for proteins and whose role—if any—has been poorly understood. Recently, science has come to understand that non-coding RNA may play a more important role than originally believed.

"'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.,

***

"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. She uses a car analogy. The engine might be running; but when the brakes are on, the car does not move. You have to take off the brakes and hit the gas to get the car to move.

"'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."

"Lubin says 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."

Comment: As usual a complex arrangement of this sort cannot arise from change mutations. Developed memories are very important in maintaining an individual life. like here can food be obtained. Memory systems must exist from the start of a new species. Only purposeful design fits.