Alnylam CFO John Conley has resigned his position from the company, according to a recent Alnylam filing with the US Securities and Exchange Commission.

According to Alnylam, Conley’s departure became effective Jan. 31. Additional details were unavailable.

Mark Lotz has become vice president for regulatory affairs of MediciNova, the company said last week. Prior to joining the company, he worked as executive director of regulatory affairs at Isis Pharmaceuticals.