Here are some links that will provide you with some more information about genetic testing, kidney disease and genetic illnesses:
National Kidney Foundation – https://www.kidney.org/
Genetic Disease Foundation – http://www.geneticdiseasefoundation.org/
National Human Genome Research Institute FAQs about Genetic Testing – http://www.genome.gov/19516567
National Organization for Rare Disorders: Denys-Drash Information – https://rarediseases.org/rare-diseases/denys-drash-syndrome/
National Health Services Bristol Genetics Laboratory – http://www.nbt.nhs.uk/severn-pathology/pathology-services/bristol-genetics-laboratory-bgl