About My Health Careers Internship MedBlogs Contact us
Medindia LOGIN REGISTER
Advertisement

Messenger RNA may Catch More Than One Ride to Avoid Disease

by Bidita Debnath on November 26, 2013 at 11:50 PM
Font : A-A+

 Messenger RNA may Catch More Than One Ride to Avoid Disease

A mRNA may travel one way down a cell, then board another, aptly named motor protein and head in the opposite direction to get where it ultimately needs to be, finds scientists.

It turns out that your messenger RNA may catch more than one ride to get where it's going.

Advertisement

It's a pretty important journey, because mRNA determines which proteins a cell expresses, differentiating a brain cell from, say, a muscle cell, said Dr. Graydon B. Gonsalvez, cell biologist at the Medical College of Georgia at Georgia Regents University.

"It used to be thought there was a relatively simple scenario where if a cargo needs to go here, it gets on one track and it goes that way," said Gonsalvez, corresponding author of the study in the journal PLOS ONE.
Advertisement

But like a motorist on a backed-up interstate, scientists at MCG and the University of Cambridge, have found that mRNA needs the flexibility to maneuver around potentially numerous obstacles in its path to ultimately arrive at the right spot.

"The ability to reverse their tracks is important to their ability to eventually get where they need to go," Gonsalvez said. And location is really everything, because the proteins need to be expressed in a specific location to function correctly.

While too much misdirection is incompatible with life, a little is OK and maybe even normal. But at levels in between, the health consequences can include Alzheimer's, cancer, multiple sclerosis, and Fragile X syndrome, which can produce mild to severe intellectual deficits as well as physical characteristics such as flat feet and an elongated face. "Most human diseases come from not a loss of a process, but a compromise to the process," Gonsalvez said.

The scientists suspected the bidirectional ability because they could see the two motor proteins that would head in opposite directions parked side-by-side in the cell. When they removed the then-idle motor that could go in the opposite direction, delivery, or localization, of the cargo mRNA already en-route was compromised.

"What we have seen is that there are many things that can reverse that track," Gonsalvez said. "If they can only go in one direction, they can bump into something, like a stray organelle, and get stuck."

Motor proteins have long been known to haul mRNA up and down the cell's cytoskeleton, which essentially functions as an internal roadway for the cell. Gonsalvez recently received a $1.4 million grant from the National Institutes of Health to fill in other important knowledge gaps about the journey, like how the motor proteins know which mRNA to transport, because not all mRNA needs to be localized.

He likens the routing system to a ZIP code and thinks proteins are again key, but in this case, they are bound to the mRNA, flagging it for travel. "Something is telling the cell that this message is different," he said.

In the case of Fragile X syndrome, for example, he suspects that one or more proteins that should be bound to mRNA are missing so the cell can't tell the messenger it needs to be moved.

Another question Gonsalvez wants to answer is how mRNA holds on for the ride since the motor protein won't bind with it directly.

"These are not easy questions but the thought is once we understand the answers, we will understand why, when you have a defect in this process, you have a disease pathology," Gonsalvez said.

He notes that transportation of mRNA occurs lifelong, since proteins have a limited life and are constantly being replaced.

His research model is the comparatively simple fruit fly in which the technology is available to selectively knock out motor proteins in specific cells. His published research was funded by the American Cancer Society and the NIH.

Source: Eurekalert
Advertisement

Advertisement
News A-Z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
News Category
What's New on Medindia
Printed Temperature Sensors help with Continuous Temperature Monitoring
Health Benefits of Giloy
Breast Cancer Awareness Month 2021 - It's time to RISE
View all

Medindia Newsletters Subscribe to our Free Newsletters!
Terms & Conditions and Privacy Policy.


Recommended Reading
Taste Perception Is Affected By Variation in Bitter Receptor MRNA Expression
Have you ever wondered why you love chomping on raw broccoli while your best friend can't stand the ...
Synthetic mRNA may Trigger Cardiovascular Regeneration of the Infarcted Heart
Scientists has taken a major step towards treatment for heart attack, by instructing the injured ......
Human Gene Expression Has a New Mechanism
Researchers have now discovered a single gene that could possibly encode two separate proteins from ...
Multiple Varieties of Breast Cancer Better Understood With Latest Data
Various biological differences between individual breast cancers were elucidated with latest ......

Disclaimer - All information and content on this site are for information and educational purposes only. The information should not be used for either diagnosis or treatment or both for any health related problem or disease. Always seek the advice of a qualified physician for medical diagnosis and treatment. Full Disclaimer

© All Rights Reserved 1997 - 2021

This site uses cookies to deliver our services. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use