Jan. 31, 2013 New design guidelines from researchers in Singapore simplify the development of targeted therapies for muscular dystrophy and other diseases.
The dystrophin protein offers critical support to muscle fibers. Mutations affecting dystrophin's expression cause the muscle-wasting disease muscular dystrophy. In Duchenne muscular dystrophy (DMD), these mutations take the form of small sequence changes that make much of the dystrophin gene (DMD) untranslatable, yielding nonfunctional protein or no protein at all.
Therapies based on a strategy known as 'exon skipping' could undo the damage from these mutations. Development of such treatments is set to accelerate, thanks to research by a team led by Keng Boon Wee of the A*STAR Institute of High Performance Computing and Zacharias Pramono of the National Skin Centre in Singapore.
Proteins are translated from messenger RNA transcripts of genes; however, only certain RNA regions -- known as exons -- actually encode protein, and these are enzymatically spliced together prior to translation. Several clinical studies have demonstrated that small 'antisense oligonucleotide' (AON) molecules that bind mutated DMD exons can induce elimination of those defective exons during splicing, yielding shorter but largely functional versions of dystrophin. "We are cautiously optimistic that AON-induced exon skipping could be the first effective therapy for DMD patients," says Wee.
Unfortunately, DMD arises from many different mutations, and targeted AON design remains a time-consuming, trial-and-error process. To address this challenge, Wee and Pramono sought to define the characteristics of AONs that efficiently promote exon-skipping. They used computational analysis to zoom in on exonic sequences that coordinate splicing. They also identified regions of suitable length within dystrophin RNA transcripts that span these sequences and would be accessible to AONs in living cells.
The researchers thus derived a set of guidelines enabling them to effectively design AONs that targeted nine different exons affected in DMD patients. For each exon, at least one AON proved capable of boosting dystrophin expression to clinically relevant thresholds in cultured muscle cells (see image). "Our proposed set of factors resulted in a reasonable success rate of designing efficient AONs -- 61% versus 38% using semi-empirical methods," says Wee. Clinical studies have already demonstrated the promise of efficient exon skipping in treating DMD patients.
Wee notes that other diseases arising from abnormal RNA processing could also benefit from this approach. However, his team is also exploring this method as a general strategy to abort production of disease-causing proteins in cancer and other conditions. "In contrast to small-molecule inhibitor drugs that can target only about 10% of the human genome, this approach could downregulate most human genes," Wee says.
Share this story on Facebook, Twitter, and Google:
Other social bookmarking and sharing tools:
Story Source:
View post:
Gene therapy: Editing out genetic damage
- Muscular .Dystrophy -Successful-treatment by acupressure , Ayurveda, Yoga - May 10th, 2011 [May 10th, 2011]
- Muscular Dystrophy Treatment - Todd Harrison Improving Balance - May 16th, 2011 [May 16th, 2011]
- Oculopharyngeal Muscular Dystrophy (OPMD): Exploring Causes and Treatment - May 20th, 2011 [May 20th, 2011]
- Muscular Dystrophy Treatment - Todd Harrison holding body weight - May 21st, 2011 [May 21st, 2011]
- David G VECTTOR Muscular Dystrophy Treatment double arm strength month 6 - May 22nd, 2011 [May 22nd, 2011]
- David Gould Becker Muscular Dystrophy VECTTOR Treatment - June 2nd, 2011 [June 2nd, 2011]
- Muscular Dystrophy Halo - June 3rd, 2011 [June 3rd, 2011]
- Muscular Dystrophy VECTTOR Treatment Documentary - Todd's 6 Month Journey - June 7th, 2011 [June 7th, 2011]
- Muscular Dystrophy Treatment Results - David Gould - New Footage - June 8th, 2011 [June 8th, 2011]
- Muscular Dystrophy - Rewriting History with VECTTOR - June 10th, 2011 [June 10th, 2011]
- Muscular Dystrophy - David Gould 5 month VECTTOR treatment for BMD - June 12th, 2011 [June 12th, 2011]
- Duchenne's Muscular Dystrophy Stem Cell Treatment - Reelabs India - June 14th, 2011 [June 14th, 2011]
- Muscular Dystrophy VECTTOR Treatment - Todd Harrison/Luau Presentation - June 16th, 2011 [June 16th, 2011]
- Dr. William Rader - Muscular Dystrophy Breakthrough - June 16th, 2011 [June 16th, 2011]
- Muscular Dystrophy patient at Xcell-center - Nabeel Mohamed Abdulhusain, 46 years - June 17th, 2011 [June 17th, 2011]
- Charlie's Story: Duchenne Muscular Dystrophy Part 4 - July 18th, 2011 [July 18th, 2011]
- Muscular Dystrophy VECTTOR Treatment - David Gould/Luau Presentation - July 19th, 2011 [July 19th, 2011]
- Testimonial 4 of Muscular Dystrophy after Stem Cell Therapy - August 5th, 2011 [August 5th, 2011]
- Drug Combo Dynamic in Muscular Dystrophy - August 9th, 2011 [August 9th, 2011]
- Testimonial for Fetal Stem Cell Treatment of Duchenne Muscular Dystrophy - August 25th, 2011 [August 25th, 2011]
- Improvement seen in Duchenne Muscular Dystrophy after Stem Cell Therapy - September 11th, 2011 [September 11th, 2011]
- Muscular Dystrophy STS/VECTTOR treatment results - September 24th, 2011 [September 24th, 2011]
- Muscular Dystrophy VECTTOR Treatment Documentary - Todd's One Year Journey - October 2nd, 2011 [October 2nd, 2011]
- Muscular Dystrophy Treatment Day 18 - Todd Harrison's Improvement - October 2nd, 2011 [October 2nd, 2011]
- Wang Yisheng - Muscular Dystrophy Adult Stem Cell Patient - October 9th, 2011 [October 9th, 2011]
- Becker Muscular Dystrophy Miracle TREATMENT - October 11th, 2011 [October 11th, 2011]
- Muscular dystrophy patient_Kleber_Brazil.wmv - October 12th, 2011 [October 12th, 2011]
- Testimonial 1 of Muscular Dystrophy after Stem Cell Therapy - Video - October 18th, 2011 [October 18th, 2011]
- Becker Muscular Dystrophy STS Treatment - Video - October 18th, 2011 [October 18th, 2011]
- Potential Stem Cell treatment of Duchenne Muscular Dystrophy - Video - October 21st, 2011 [October 21st, 2011]
- Muscular Dystrophy treated by Dr Rajesh Shah at Life Force - Video - October 22nd, 2011 [October 22nd, 2011]
- Defying Muscular Dystrophy - I Made It - Video - October 23rd, 2011 [October 23rd, 2011]
- Becker Muscular Dystrophy AMAZING treatment results - Video - October 27th, 2011 [October 27th, 2011]
- First targeted treatment success for Duchenne muscular dystrophy - Video - November 6th, 2011 [November 6th, 2011]
- 125 Days of VECTTOR Treatment Progress - November 18th, 2011 [November 18th, 2011]
- Becker Muscular Dystrophy WALKING ABILITY IMPROVED - Video - November 25th, 2011 [November 25th, 2011]
- PT Muscular Dystrophy Treatment Results - Video - December 5th, 2011 [December 5th, 2011]
- Duchenne Muscular Dystrophy Treated by Cellmedicine - Video - January 8th, 2012 [January 8th, 2012]
- muscular DYSTROPHY treatment IN HOMEOPATH.mp4 - Video - January 28th, 2012 [January 28th, 2012]
- Giulio's strategy is to cure dystrophy with stem cell treatment - Video - January 31st, 2012 [January 31st, 2012]
- Parent Project Muscular Dystrophy is a Featured Nonprofit Selected by Webkinz(TM) Foundation - February 1st, 2012 [February 1st, 2012]
- MDA Awards More Than $12 Million in Grants to Advance Neuromuscular Disease Research - February 1st, 2012 [February 1st, 2012]
- "For treatment we will have in the future" - Video - February 2nd, 2012 [February 2nd, 2012]
- Renowned Pediatric Cardiology Physician-Scientist Linda Cripe Joins Nationwide Children's Hospital - February 3rd, 2012 [February 3rd, 2012]
- JumpStart Invests $250,000 in Milo Biotechnology - February 14th, 2012 [February 14th, 2012]
- When nerve meets muscle, biglycan seals the deal - February 14th, 2012 [February 14th, 2012]
- Medical clinics offer help for Big Island children - February 16th, 2012 [February 16th, 2012]
- Dateline Long Beach: The Aquatic Center brings swim therapy to disabled - February 19th, 2012 [February 19th, 2012]
- Parent Project Muscular Dystrophy Awards $500,000 to Tivorsan Pharmaceuticals - February 21st, 2012 [February 21st, 2012]
- Cure Duchenne Announces Three New Funded Research Projects to Help Develop Treatments and Find a Cure for Duchenne ... - February 21st, 2012 [February 21st, 2012]
- Ligand Licenses DARA Program to Retrophin - February 21st, 2012 [February 21st, 2012]
- AVI BioPharma Regains NASDAQ Compliance - February 23rd, 2012 [February 23rd, 2012]
- Scientists create potent molecules aimed at treating muscular dystrophy - February 23rd, 2012 [February 23rd, 2012]
- AVI BioPharma Announces Fourth Quarter and Full Year 2011 Financial Results and Corporate Update Conference Call - February 23rd, 2012 [February 23rd, 2012]
- Pembroke's Christine McSherry is an 'Inspirational Woman' - February 25th, 2012 [February 25th, 2012]
- The Rare Clinical Diseases Research Network - February 25th, 2012 [February 25th, 2012]
- A Solution for Duchenne Muscular Dystrophy? - Research Summary - February 28th, 2012 [February 28th, 2012]
- A Solution for Duchenne Muscular Dystrophy? -- In Depth Doctor's Interview - February 28th, 2012 [February 28th, 2012]
- Antisense oligonucleotides make sense in myotonic dystrophy - February 28th, 2012 [February 28th, 2012]
- A life of dependence - February 29th, 2012 [February 29th, 2012]
- Nationwide Children's Hospital neuromuscular disorder podcasts now available on iTunes - March 2nd, 2012 [March 2nd, 2012]
- Next-generation DNA sequencing to improve diagnosis for muscular dystrophy - March 6th, 2012 [March 6th, 2012]
- The Dire Limits of Health Care - March 7th, 2012 [March 7th, 2012]
- AVI BioPharma Announces Late-Breaker Oral Presentation of Phase IIb DMD Study at 2012 AAN Annual Meeting in April - March 12th, 2012 [March 12th, 2012]
- Cataracts affect millions of people around the globe, and for many of us they will be a normal part of our aging ... - March 14th, 2012 [March 14th, 2012]
- Your Health: Duchenne's Muscular Dystrophy - March 16th, 2012 [March 16th, 2012]
- Newborn Screening for Duchenne Muscular Dystrophy Shows Promise as an International Model - March 20th, 2012 [March 20th, 2012]
- Newborn screening for DMD shows promise as an international model - March 20th, 2012 [March 20th, 2012]
- Rhenovia launches drug discovery for Huntington's disease - March 20th, 2012 [March 20th, 2012]
- Halo Therapeutics Reports Favorable Independent Review of Lead Drug Candidate HT-100 - March 21st, 2012 [March 21st, 2012]
- Invasive treatment strategy may increase survival for patients with certain neuromuscular disorder - March 28th, 2012 [March 28th, 2012]
- Parent Project Muscular Dystrophy Endorses FAST Act Legislation to Expedite FDA Review of Life-Saving Therapies - March 29th, 2012 [March 29th, 2012]
- AVI BioPharma Announces Conference Call and Webcast on Monday, April 2, 2012, to Discuss Top-Line Data Results From ... - March 31st, 2012 [March 31st, 2012]
- Drug for rare disease may lift AVI BioPharma shares: Barron's - April 2nd, 2012 [April 2nd, 2012]
- AVI BioPharma Announces Eteplirsen Meets Primary Endpoint, Demonstrating a Significant Increase in Dystrophin at 24 ... - April 2nd, 2012 [April 2nd, 2012]
- U.S. Stock Futures Little Changed Before Factory Report - April 2nd, 2012 [April 2nd, 2012]
- Leading experts on congenital muscular dystrophy convene at University of Nevada, Reno - April 20th, 2012 [April 20th, 2012]
- Nature Publishes Work Utilizing N-Gene's Core Technology to Advance the Treatment of Duchenne Muscular Dystrophy - April 20th, 2012 [April 20th, 2012]
- Getting the boots filled - April 29th, 2012 [April 29th, 2012]
- Local business, civic leaders 'arrested' for MDA fundraiser - May 3rd, 2012 [May 3rd, 2012]