I have DDF508
Normally 2 mutations are found for a CF dx. NOT always. We have members where only 1 mutations has been identified, but according to testing & symptoms they have been given a CF diagnoses.
Although mutations normally have certain characteristics linked to them. It by no means guarantees that a CFer with those mutations will follow suit according to those characteristic.
Twins with the identical mutations can present symptoms completely different. "Mild" or "Severe" mutations also vary according to people. Many people want to know what their mutations are hoping it will give them an idea of what to expect.
The problem with that mind set is that CF is progressive. Since meds, compliance, other genetic & environmental issues, mental attidue & luck all play a part in things its not wise IMHO to put everything just in what mutations you have.
Hope this answered most of your ??!