The gene SIX5 encodes a transcription factor that combines with EYA1 to activate several genes required to develop eye, ear, branchial arches, and kidney. Mutations in these two genes cause a similar clinical picture. Branchiootorenal dysplasia syndrome 2 is autosomal dominant.
| Clinic | Method | Carrier testing |
| Turnaround | 5 days | |
| Specimen type | genomic DNA |
| Clinic | Method | Massive parallel sequencing |
| Turnaround | 25 days | |
| Specimen type | genomic DNA |
| Clinic | Method | Genomic sequencing of the entire coding region |
| Turnaround | 25 days | |
| Specimen type | genomic DNA |