** Shares of drug developer PepGen PEPG.O up 21% at $5.53, while Dyne Therapeutics DYN.O rise 37.5% at $23.54
** Rival Avidity Biosciences RNA.O on Sunday agreed to be acquired by Swiss drugmaker Novartis NOVN.S for about $12 billion in cash to bolster its portfolio of treatments for rare muscle disorders
** Pepgen and Dyne are also currently developing drugs to treat rare muscle disorders such as myotonic dystrophy type 1
** "We anticipate DYN to trade materially higher tomorrow given similar platform, not materially behind RNA and $2.4b cap"- RBC Capital Markets
** Including session moves, DYN up 1.8% and PEPG up 47.8% YTD
(Reporting by Sneha S K)
((Sneha.SK@thomsonreuters.com;))