Various organisms have sets of essential amino acids that they cannot synthesize themselves, but rather that they must obtain from food. Humans have 9 of these amino acids. However, obviously certain organisms like plants contain the necessary genes to synthesize all of their amino acids. Also, the set of amino acids for various organisms differs. For example, arginine is essential in dogs but not in humans.
Have there been any attempts at taking cells from an animal or other organism with essential amino acids and providing them with the necessary genes to synthesize that amino acid, thereby reducing the cell's set of essential amino acids?
I am not asking this specifically referring to human cells, nor do I have any particular motivation for asking this other than curiosity.