Primary Hyperoxaluria

This study is being done to obtain samples from patients with primary hyperoxaluria, cystinuria, adenine phosphoribosyl transferase (APRT) deficiency, and Dent disease, and from their family members, for use in future research.

The purpose of this study is to collect medical information from a large number of patients in many areas of the world with primary hyperoxaluria (PH), Dent disease, Cystinuria and APRT deficiency. This information will create a registry that will help us to compare similarities and differences in patients and their symptoms. The more patients we are able to enter into the registry, the more we will be able to understand the Primary Hyperoxalurias,Dent disease, cystinuria and APRT and learn better ways of caring for patients with these diseases.

The goal of this National Registry is to is to collect information from patients with rare kidney diseases, so that it that can be used for research. The purpose of this research is to: * Develop Clinical Guidelines for specific rare kidney diseases. These are written recommendations on how to diagnose and treat a medical condition. * Audit treatments and outcomes. An audit makes checks to see if what should be done is being done and asks if it could be done better. * Further the development of future treatments. Participants will be invited to participate on clinical trials and other studies. The registry has the capacity to feedback relevant information to patients and in conjunction with Patient Knows Best (Home - Patients Know Best), allows patients to provide information themselves, including their own reported quality of life and outcome measures.

In Germany parents of newborns are offered newborn screening (NBS) for 17 congenital diseases as a standard benefit of statutory health insurance. NBS in Germany is voluntary. Cystinosis and hyperoxaluria are very rare diseases. They are inherited autosomal-recessively. Neither disease can be detected by the methods established in routine NBS. However, common genetic mutations are known for both diseases. The aim of the study is to provide a scientific basis for molecular genetic NBS for cystinosis and primary hyperoxaluria (PH). Specifically, the study will investigate whether the inclusion of these diseases into general NBS should be recommended. By observing the identified infants in comparison to patients symptomatically diagnosed outside of the pilot project, it will be determined whether and to what extent early diagnosis and therapy lead to a more favorable prognosis. The screening laboratory Hannover, Germany is involved in the project. Hospitals that send their dry blood spot cards for routine NBS to Hannover are offered participation in the project. Parents who want to participate receive an additional information sheet. A parent and the attending physician sign the information sheet as documentation of informed consent, which allows data transfer and patient referral to a specialist in case of a positive result. Molecular genetic screening in the pilot project is performed from the same dry blood spot card used for routine NBS. In both diseases, testing is performed for 2 known mutations: In cystinosis for the 2 mutations most common in Germany, and in PH for the most common mutation in infantile hyperoxaluria (PH1) and in Europe (PH3). Normal findings are not communicated to the parents, which may contact the laboratory to ask for them. Parents of newborns with two mutations in the cystinosis gene are immediately informed about the disease by a physician. Further diagnostics to confirm the disease are organized close to home. In contrast, parents of newborns with only one mutation in one of the two hyperoxaluria genes are informed. They are asked to send spot urines of the newborn to the hyperoxaluria center. Only if these are abnormal, further evaluation will be performed. The study started on 15.03.2022. The aim is to screen 200,000 newborns until 2025. If the benefit of early diagnosis and therapy can be shown, an application for inclusion of a NBS for these two diseases in the routine NBS program will be submitted to the German government.