CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) is a natural defence system found in bacteria, which scientists have turned into a programmable way to edit genes with extraordinary precision. In practice, it comprises two parts: a guide RNA that acts like a GPS to find the exact spot in DNA, and a Cas9 enzyme that acts like molecular scissors to cut the DNA. Once the DNA is cut, scientists can delete, fix, or replace genetic sequences inside a living cell. Our first Cover seems to have been over six years ago (LSS 23 11 20), since when we have noted a startling range practical applications from areas as diverse as horse breeding, and sickle cell medicine, to its relationship with blue sky techniques such as Base Pair editing, CART and programmable therapeutics (LSS passim).
How gratifying then to see CRISPR-based tools now partnered with epigenetics, that other old favourite of these humble pages! Once again the lead is taken by the indispensable Nature Briefing, now our go-to for all new things Scientific Their summary CRISPR’s next act: editing the epigenome tells you most of what you need to know. But some readers may well wish to click on the handy link too
A handful of start-up firms are testing therapies that target specific epigenetic markers — essentially chemical groups that sit on DNA and the proteins that it is wound around — to treat everything from high cholesterol to a rare muscular disorder. Changing these chemical markers can switch genes on or off. Some existing medications influence epigenetic markers, but these drugs act broadly and lack specificity. A new cadre of scientists has found ways to precisely alter the epigenetic signals that influence specific genes.
There is much here to gladden the hearts of all who believe in Reason and Learning. The technique seemingly so radical a few short years ago is not only becoming routine, it is embedding itself into the wider corpus of medical and scientific practice. Practicable applications are multiplying and the opportunities to reduce human and animal suffering are thereby multiplying. If anyone asks us “why do you take such an interest in the progress of the Arts, Sciences and Letters?” one answer we give is: because of things like this.
If you want to know more about epigenetics, or molecular biology in general, then we cannot do better than recommend the works of the great Professor Carey:
Carey, Nessa. The Epigenetics Revolution: How Modern Biology Is Rewriting Our Understanding of Genetics, Disease, and Inheritance.London: Icon Books, 2011. New York: Columbia University Press, 2012. ISBN: 9781848312920 (Icon Books); 9780231530712 (Columbia UP).
Carey, Nessa. Hacking the Code of Life: How Gene Editing Will Rewrite Our Futures.London: Icon Books, 2019. New York: Columbia University Press, 2019. ISBN: 9781785784972 (Icon Books); 9780231549769 (Columbia UP).
#molecular biology #genetics #epigenetics #CRISPR Cas 9 #medicine #health #DNA #RNA
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