I found a very interesting article about a rare form of diabetes that can be cured now. Here is a link to the website.
Here is a paragraph that describes briefly what monogenic diabetes is:
Monogenic forms of diabetes may account for about 1 to 2 percent of all cases of diabetes in young people. In some cases of monogenic diabetes, the gene mutation is inherited; but in others, the gene mutation develops spontaneously. Most mutations in monogenic diabetes reduce the body's ability to produce insulin, a protein produced in the pancreas that is essential for the body to use glucose for energy. As a result, monogenic diabetes can easily be mistaken for type 1 diabetes.