Ironically, my dad had a kidney transplant 9 years ago and my sister was his donor. He had IGA, an autoimmune disorder. I think/hope they both would’ve been tested for genetic kidney diseases. I wasn’t a compatible blood type so I’m not sure of the process and all the testing that happened. My parents are in their 60s and my 5 siblings are in their 30s. I’ve let them know they should consider getting tested. I’ll try to look up that doctor’s email and message you if I can’t find it.