Is type 1 diabetes a mutation?

Answer 1

Type 1 Diabetes is in fact a multigenic disease. Common mutated genes are those for MHC Class II proteins, which can have point mutations or small insertions/deletions causing frameshift mutations.
It is important to note that being a multigenic disease the environment has a major role on the onset of the disease; meaning that two individuals with the same exact mutation may develop diabetes type 1 or not, depending where and how they were raised.

Answer 2

no it is not a mutation

it is where your pancreas stops working it doesn't mutate it just stops working, nobody knows why and there is no cure, but can be controlled by taking insulin injections. I just read that they are 5 to 10 years away from a cure and there is another test that is very promising.