Vigene, a gene therapy development company, said it intends to lease a 52,000 square-foot manufacturing space at 14200 Shady Grove Road that will nearly double the company’s existing manufacturing footprint. The new space is in addition to its existing headquarters, R&D, and manufacturing locations that opened in Rockville last year. The additional space from the new facility will allow the company to expand its current headcount of 125 by the addition of 245 more employees.