** Shares of drug developer PepGen PEPG.O rise 130% to $6.10 premarket
** Co said late on Wednesday its experimental drug, PGN-EDODM1, helped fix a key issue in patients with a muscle disease by improving how their cells process genetic instructions
** The drug was being tested in an early-stage trial as a potential treatment for myotonic dystrophy type 1, a genetic condition that causes muscles to weaken and stiffen, and can also affect the heart and lungs
** PepGen believes that correcting faulty RNA splicing could help reverse symptoms like muscle weakness and stiffness
** As of last close, stock down 29.8% YTD
(Reporting by Kamal Choudhury in Bengaluru)
((Kamal.Choudhury@thomsonreuters.com;))