PDA

View Full Version : Breakthrough shows how DNA is ‘edited’ to correct genetic diseases



Jean M
05-27-2014, 09:10 PM
An international team of scientists has made a major step forward in our understanding of how enzymes ‘edit’ genes, paving the way for correcting genetic diseases in patients. Researchers at the Universities of Bristol, Münster and the Lithuanian Institute of Biotechnology have observed the process by which a class of enzymes called CRISPR – pronounced ‘crisper’ – bind and alter the structure of DNA.

The results, published in the Proceedings of the National Academy of Sciences (PNAS) today [26 May], provide a vital piece of the puzzle if these genome editing tools are ultimately going to be used to correct genetic diseases in humans.

CRISPR enzymes were first discovered in bacteria in the 1980s as an immune defence used by bacteria against invading viruses. Scientists have more recently shown that one type of CRISPR enzyme – Cas9 – can be used to edit the human genome - the complete set of genetic information for humans....

Professor Mark Szczelkun, from Bristol University’s School of Biochemistry, said: "An important challenge in exploiting these exciting genome editing tools is ensuring that only one specific location in a genome is targeted. Our single molecule assays have led to a greater understanding of the influence of DNA sequence on R-loop formation. In the future this will help in the rational re-engineering of CRISPR enzymes to increase their accuracy and minimise off-target effects. This will be vital if we are to ultimately apply these tools to correct genetic diseases in patients. ”

http://www.bristol.ac.uk/news/2014/may/genome-editing.html

Paper

Mark D. Szczelkun, Maria S. Tikhomirova, Tomas Sinkunas, Giedrius Gasiunas, Tautvydas Karvelis, Patrizia Pschera, Virginijus Siksnys and Ralf Seidel, Direct observation of R-loop formation by single RNA-guided Cas9 and Cascade effector complexes, PNAS.
http://www.pnas.org/content/early/2014/05/22/1402597111.abstract

Amerijoe
09-21-2016, 12:25 PM
Since Jean M posted the story on Crisper an on-going fight has been in the courts over ownership rights. Anyone looking into the case will be bewildered at the technical aspects being presented. Here is a cartoon to clarify what exactly is going on. Stakes are high. The technology is worth billions.

https://thenib.com/bad-blood

Amerijoe
10-03-2016, 05:24 PM
Here is another article projecting CRISPR technology to accelerate.

http://www.digitaltrends.com/features/as-tech-trickles-in-medicine-is-about-to-hit-warp-speed/?utm_source=Sailthru&utm_medium=email&utm_campaign=DT:%20Brief%20Daily%202016-10-03&utm_term=DT%20Newsletter%20-%20Daily%20Subscribers

Amerijoe
10-10-2016, 12:20 PM
This video will show you how CRISPR works.

https://youtu.be/_8gE2P35Zuk

tejus
10-25-2016, 05:44 AM
There is a fight in the courts over ownership rights. Technology is good and will stay.

Amerijoe
11-15-2016, 09:40 PM
First human test with CRISPR started.

http://seekingalpha.com/news/3224847-china-takes-lead-crispr-cas9-start-first-ever-clinical-trial

Amerijoe
05-31-2017, 06:01 PM
Hold on to your gene editor, 'Houston We Have A Problem'.

https://www.digitaltrends.com/cool-tech/crispr-gene-mutation/?utm_source=Sailthru&utm_medium=email&utm_campaign=DT:%20Brief%20Daily%202017-05-31&utm_term=DT%20Newsletter%20-%20Daily%20Subscribers