The study is an open-label study to determine the safety and efficacy of VX-147-101 in subjects who have APOLI dependent FSGS. The study comprises three periods: screening, treatment, and follow-up. The study includes a screening visit to determine if you have the APOLI gene. Participation in this study will last approximately 17 weeks. Participants may choose to participate in an off-treatment observation for up to 12 additional weeks.

The purpose of this study is to test to see if you have a certain genetic mutation (changes in DNA) so we can learn more about kidney disease. The study involves one blood and saliva test and takes about 30 minutes. The blood test is to see if you have genetic changes in your DNA of a protein called APOL1. People who have this gene mutation may be at risk of losing their kidney function faster than others. The test won't cost you anything. In fact, if you decide to participate, you will be compensated $45. You should know that the test used to determine if you have an APOL1 genetic mutation is not FDA approved, however the FDA has approved this test for research purposes. If you were to participate in this study and take the blood test, and the result indicated you have this mutation, there may be an opportunity in the future to volunteer in an additional research study where you will receive the treatment. This treatment is designed by Vertex, especially for people with kidney disease from APOL1 mutation.