Navigation Links
Toxic Strand Of RNA Causes Myotonic Muscular dystrophy

Studies have indicated that myotonic dystrophy in adults, which is the most common type of myotonic dystrophy could be due to a toxic RNA. //
br> Doctors at the University of Virginia Health System have shown for the first time that by getting rid of poisonous RNA (ribonucleic acid) in muscle cells could result in the reversing myotonic dystrophy.

Statistics show that around 40,000 people in the United States have myotonic muscular dystrophy (MMD). The disease is known to cause a slow, progressive wasting of the muscles, irregular heartbeat, cataracts and insulin resistance. Many of the people with the condition are usually oblivious of it until their teens.

To prove the theory that toxic RNA is involved in myotonic muscular dystrophy, a research team led by Dr. Mani Mahadevan, a UVa pathologist, duplicated the disease in mice. "We showed in our mouse model that when you make this poisonous RNA the mice get various aspects of myotonic dystrophy," Mahadevan said. "Then, when you take away the toxic RNA, the mice get back to normal."

Mahadevan hopes the research might lead to new therapies for MMD in the next few years. "If we develop a therapy to silence the expression of the toxic RNA molecule, that would be a viable approach to treat people with myotonic muscular dystrophy," he said. Mahadevan's research in published in the September 2006 issue of Nature Genetics and can be found online at: http://www.nature.com/ng/index.html.

Making RNA is the second step in the conversion of DNA into proteins that determine the function of the body's cells. Myotonic muscular dystrophy is the first example of a disease caused by toxic RNA.

In 1992, Mahadevan discovered the gene mutation that causes myotonic muscular dystrophy (type 1) as part of a research group in Canada. The mutation is an increased number of CTG repeats in a gene called DMPK. Everyone with myotonic muscular dystrophy has that mutation on chromoso me 19, which is now part of a genetic, diagnostic test for myotonic dystrophy.

In their latest research, Mahadevan and colleagues created a new type of mouse model with many extra copies of the CTG repeats, each attached to DNA for a protein that glows green under a microscope. They also integrated an "on switch" for MMD in the mice, activated by giving them doxycycline, an antibiotic, in their drinking water.

When mice began to produce many copies of RNA with CTG repeats, they developed the hallmarks of type 1 MMD within a few weeks, including an inability to relax muscles and heart rhythm abnormalities. When doxycycline was stopped, mice stopped producing toxic RNA and returned to normal, except in cases when the heart was severely damaged.

So far, however, Mahadevan and other scientists can't explain exactly what happens inside the cell to cause someone to get myotonic dystrophy. "The prevailing theory is that the RNA remains in the nucleus, rather than moving out of it, and proteins get stuck to the RNA and aren't able to do their job," Mahadevan said.

This toxic RNA in not found in every cell of body, Mahadevan said. Rather, it is produced in higher levels in muscle cells, in the heart and brain, in the lining of the intestines and in the lens and muscles of the eyes.

(Source: EurekAlert)
'"/>




Related medicine news :

1. Toxic effects common with AIDS treatments
2. Toxic chemicals found in domestic products poisoning newborn babies
3. Bifidogenic Growth Stimulator: A Non-Toxic Way To Treat Ulcerative Colitis
4. Acute Toxicity Of Nano-Scale Zinc Powder: Severe Renal Damage And Anemia
5. Passive smoking declared as Toxic in California
6. Bacteria Can Convert Flame Retardant Into Toxic Form
7. "Miracle" Cancer Drug Gleevec Can be Toxic to the Heart
8. Agricultural Workers Taken ill after Inhaling Toxic Fumes in Orissa
9. Toxic and Addictive Foods Responsible For Obesity
10. Herceptin Use May Enhance Cardiac Toxicity, Study
11. Scientists Develop Non-Toxic, Food Safe Paint
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/25/2016)... ... 2016 , ... "With 30 hand-drawn hand gesture animations, FCPX users can easily ... of Pixel Film Studios. , ProHand Cartoon’s package transforms over 1,300 hand-drawn pictures ... . Simply select a ProHand generator and drag it above media or text in ...
(Date:6/25/2016)... ... June 25, 2016 , ... Dr. Calvin Johnson has ... he has implemented orthobiologic procedures as a method for treating his patients. The ... first doctors to perform the treatment. Orthobiologics are substances that orthopaedic surgeons use ...
(Date:6/24/2016)... ... June 24, 2016 , ... A recent article published ... unfamiliar with. The article goes on to state that individuals are now more comfortable ... less common operations such as calf and cheek reduction. The Los Angeles area medical ...
(Date:6/24/2016)... ... June 24, 2016 , ... Marcy was in a crisis. Her son James, eight, was ... his family verbally and physically. , “When something upset him, he couldn’t control his emotions,” ... He would throw rocks at my other children and say he was going to kill ...
(Date:6/24/2016)... ... June 24, 2016 , ... Dr. Amanda Cheng, ... treatment. Dr. Cheng has extensive experience with all areas of orthodontics, including robotic ... osteogenic orthodontics. , Micro-osteoperforation is a revolutionary adjunct to orthodontic treatment. It ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... , June 23, 2016  MedSource announced today ... its e-clinical software solution of choice.  This latest ... possible value to their clients by offering a ... preferred relationship establishes nowEDC as the EDC platform ... MedSource,s full-service clients.  "nowEDC has long been a ...
(Date:6/23/2016)... , June 23, 2016 Roche (SIX: RO, ... clearance for its Elecsys BRAHMS PCT (procalcitonin) assay as ... or septic shock. With this clearance, Roche is the ... fully integrated solution for sepsis risk assessment and management. ... bacterial infection and PCT levels in blood can aid ...
(Date:6/23/2016)... Calif. , June 23, 2016 ... CST on Thursday, July 7, 2016 , , , , ... ) , , , , EXPERT PANELISTS:  , , ... Naik; Senior Industry Analyst, Christi Bird; Senior Industry Analyst, Divyaa Ravishankar ... The global pharmaceutical industry is witnessing an exceptional ...
Breaking Medicine Technology: