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 the study is to test to see if people with Focal Segmental Glomerulosclerosis (FSGS) have a genetic mutation (changes in DNA) so we can learn more about this disease. FSGS is a disease in which scar tissue develops on the parts of the kidneys that filter waste out of the blood. The FSGS in potential participants will be identified through previous kidney biopsy results in medical records and previous urine sample analysis results. The study will also help find people with a genetic mutation who may be interested in participating in future research studies.