Vinay Prasad, a top regulator at the US Food and Drug Administration, has left the agency after a controversy over his handling of Sarepta Therapeutics Inc.’s gene therapy.

Sarepta Therapeutics shares snapped a three-day losing streak on Tuesday, as analysts said resumption of U.S. shipments for its muscular gene therapy soothes immediate concerns about liquidity and the therapy's withdrawal from the market.

Shares of drugmaker Sarepta Therapeutics surged in afterhours trading Monday after the company said it would resume shipping its gene therapy.