That's because University of Wisconsin-Madison researchers have discovered that the RNA degradation, which, when improperly regulated can lead to cancer and other diseases, can be launched in an unexpected location.
"We've been seeing only half the picture," says Vladimir Spiegelman, lead author on the new study and associate professor of dermatology at the UW-Madison School of Medicine and Public Health.
The Wisconsin team also found that CRD-BP, a protein activated in colorectal and other cancers, can prevent RNA from degrading in the newly identified spot.
The finding may have broad implications for cancer research as well as biology in general.
"The finding is important for the proto-oncogenes, or precursor cancer genes, we study, but it may be even more important for the thousands of other genes and proteins that are regulated in a similar way," says Spiegelman.
The study appears in the July 31 issue of Molecular Cell.
Spiegelman and his team study proto-oncogenes and other potential "cancer-causers" normally found in cells, analyzing them as they are "converted" from DNA into RNA and ultimately active proteins that can lead to cancer.
It's the same multistep process all genes in a cell — including "cancer-preventers" such as tumor suppressors, anti-inflammatory factors and cell death promoters — go through.
Controls at each step usually keep the process working smoothly, but if a control fails at any number of places along the way, a cancer-promoting gene can tilt the delicately balanced scale toward malignancy.
In their previous work, the Wisconsin researchers found that regulation of some proto-oncogenes occurs after CRD-BP binds to messenger RNA (mRNA). During this intermediary step, mRNA is typically either degraded or goes on unharmed to the next step of translation. The Wisconsin team showed that the mRNA bound by CRD-BP was not degraded, and thus became an active protein — in this case, a full-fledged cancer-causing oncogene.
Until the Spiegelman group's latest study appeared, scientists assumed that the regulation of mRNA fate took place exclusively in an area of the RNA strand called the 3 prime untranslated region, where small regulatory RNAs called microRNAs (miRNA) bind and inhibit mRNAs.
But the Wisconsin team found degradation can also be initiated in an area on the mRNA strand called the coding region.
"This changes the paradigm," says Spiegelman. "Now we can examine this important activity in two places."
The researchers demonstrated that degradation occurs here using a human mRNA, and described the mechanism by which CRD-BP stabilizes the mRNA and prevents it from degrading and expressing more protein.
"This may be the first example of a negative regulator of an miRNA-dependent RNA-degrading mechanism," Spiegelman says.
The mechanism is relevant to many proteins, he says.
"Understanding this mechanism should also help us in studying cell signaling pathways related to pro-inflammatory and cell death factors that contribute to tumor development," he says.
Dian Land | EurekAlert!
More genes are active in high-performance maize
19.01.2018 | Rheinische Friedrich-Wilhelms-Universität Bonn
How plants see light
19.01.2018 | Albert-Ludwigs-Universität Freiburg im Breisgau
On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.
We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
19.01.2018 | Materials Sciences
19.01.2018 | Health and Medicine
19.01.2018 | Physics and Astronomy