When will it be possible to reverse, in humans, the inability to synthesize vitamin C (L-ascorbic acid), it's due to a mutations in the L-gulono-γ-lactone oxida

When will it be possible to reverse, in humans, the inability to synthesize vitamin C (L-ascorbic acid), it's due to a mutations in the L-gulono-γ-lactone oxidase (GLO) gene which codes for the enzyme responsible for catalyzing the last step of vitamin C biosynthesis.