[imchillyb]

That's the exact plot of Jurrasic Park.

I'm not saying that's what's going to happen. I'm just pointing out that's how the scientists were supposedly containing the dinos. 'Can't produce the amino acid lysene.'

Again, I'm not saying it's not feasible to prevent 'that' molecule from synthesizing a certain molecule, but observation tells us that life really does find a way...

[feet]

Fortunately, the world is not a movie and there are many ways to contain organisms by making them depend on non-canonical amino acids which do not exist in nature. Making them depend on multiple means that them acquiring the ability to produce them is astronomically low

[bayesian_horse]

Observation of Jurassic Park?

Yes, it's possible to reacquire the capability to produce something like an aminoacid. But because that has to happen extremely quickly, before the organism dies, that's extremely unlikely. And then that bacterium is still vastly inferior to all the other ones. And it doesn't have any scary properties in the first place.