Navigation Links
Renegade RNA: Clues to Cancer and Normal Growth

Researchers at Johns Hopkins have discovered that a tiny piece of genetic code apparently goes where no bit of it has gone //before, and it gets there under its own internal code.

MicroRNAs, already implicated in cancer and normal development, latch on to and gum up larger strands of RNA that carry instructions for making the proteins that do all the cell’s work. They are, says Joshua Mendell, M.D., Ph.D., an assistant professor in the McKusick-Nathans Institute of Genetic Medicine at Hopkins, like “molecular rheostats that fine-tune how much protein is being made from each gene.”

That’s why normally microRNAs always have appeared to stick close to the cell’s protein-making machinery.

But during a survey of more than 200 of the 500 known microRNAs found in human cells, Mendell’s team discovered one lone microRNA “miles away” --- in cellular terms --- from all the others.

“It was so clearly in the wrong place at the wrong time for what we thought it was supposed to be doing that we just had to figure out why,” says Hun-Way Hwang, a graduate student in human genetics and contributor to the study.

Consisting of only 20 to 25 nucleotide building blocks (compared to other types of RNA that can be thousands of nucleotides long), each microRNA has a different combination of blocks. Mendell’s team realized that six building blocks at the end of the wayward miR-29b microRNA were noticeably different from the ends of other microRNAs.

Suspicious that the six-block end might have something to do with miR-29b’s location, the researchers chopped them off and stuck them on the end of another microRNA. When put into cells, the new microRNA behaved just like miR-29b, wandering far away from the cell’s protein-making machinery and into the nucleus, where the cell’s genetic material is kept.

The researchers then stuck the same six-block end onto another type of small RNA, a small-interfering RNA or siRNA t hat turns off genes. This also forced the siRNA into the nucleus.

According to Mendell, these results demonstrate for the first time that despite their tiny size, microRNAs contain elements consisting of short stretches of nucleotide building blocks that can control their behavior in a cell. Mendell hopes to take advantage of the built-in “cellular zip code” discovered in miR-29b as an experimental tool. For example, he plans to force other microRNAs and siRNAs into the nucleus to turn off specific sets of genes.

Mendell’s team is actively hunting for additional hidden microRNA elements that control other aspects of their behavior in cells. They also are curious to figure out what miR-29b is doing in the nucleus. Because microRNAs have been implicated in cancer as well as normal development, Mendell hopes that further study of miR-29b will reveal other, hidden functions of microRNAs.

SourceNewswise
SRM
'"/>




Related medicine news :

1. Innovative yeast genome may handle Cancer Clues
2. Researchers Discover New Clues To Identify Tooth Decay
3. Leeches Provide Clues Regarding The Prevention Of Heart Disease
4. Excavations Reveal Clues Of Early Warfare
5. Sleeping Computers Yield Clues About Genetic Disorders
6. Clues To Identify Psychological Seizures
7. A Human Brain Gene Could Hold Clues On The Evolution Of Brain Capacity
8. Clues to the Mystery of Lou Gehrigs Disease
9. Clues Found On How Deadly Bacterium Gains Foothold
10. Clues to Allay Aging
11. Regrowth of Zebrafishs Tail Fin may Offer Clues for Treating Human Injuries
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:5/23/2016)... (PRWEB) , ... May 23, 2016 , ... The Society ... MSW, has decided to move on from that role. , “No one in Washington ... did Phyllis Greenberger,” said SWHR Founder Florence Haseltine, MD, PhD. “We offer our deep ...
(Date:5/23/2016)... ... May 23, 2016 , ... ... to residents of Westchester County for over 24 years, recently hosted its sixth ... members joined HOW for two remembrance ceremonies, each concluding with the release of ...
(Date:5/23/2016)... , ... May 23, 2016 , ... VitreosHealth is presenting ... 10, 2016 from 11:00 AM – 12:00 PM ET. To register, click ... start a proactive outreach program built on Big Data with a new predictive and ...
(Date:5/23/2016)... (PRWEB) , ... May 23, 2016 , ... ... information management systems (LIMS), electronic laboratory notebook systems (ELNS) and related systems is ... manual data management consumes a significant amount of lab technician time and introduces ...
(Date:5/23/2016)... ... May 23, 2016 , ... SPH ... as Chief Medical Officer. Dr. O’Connor’s deep expertise in medicine and HIT will ... services teams who deliver best-in-class solutions and transformative technologies for provider, payer, and ...
Breaking Medicine News(10 mins):
(Date:5/23/2016)... ABU DHABI , UAE, May 23, 2016 ... the importance of Precision Medicine and the role ...     The First International ... under the distinguished patronage and presence of Sheikh ... Development. The conference focused in Precision Medicine, which helps provide ...
(Date:5/23/2016)... FRANCISCO , May 23, 2016 ... to reach USD 5.0 billion by 2022, according to ... increasing generation of medical waste coupled with the lack ... industry is expected to drive the demand for reprocessed ... these devices as compared to that of the original ...
(Date:5/22/2016)... 2016 DS Biopharma (DS) ... anti-inflammatory compound DS102 in chronic obstructive pulmonary disease ... (NASH) patients. Recent DS preclinical data ... tissue and has bronchodilatory, anti-inflammatory and anti-fibrotic properties ... Company will publish further detail on these findings ...
Breaking Medicine Technology: