Yeast.
None of the yeast strains commercially used in alcoholic fermentation are genetically engineered. No GM yeast strains have been approved in any country, and this is not likely to change any time soon. At one time hopes were high that genetically modified yeast could open new possibilities for alcoholic fermentation. Several research projects were aimed at improving brewing processes to produce low-calorie or low-alcohol beers. Despite several attempts, these efforts have not panned out.