Kidney stone disease is a common problem, affecting up to 20% of men and 10% of women by 70 years of age. Hypercalciuria is linked to an increased risk of forming such stones and my research focuses on trying to understand the tubular process regulating calcium excretion. My approach is to study monogenetic disorders causing either hypercalcaemia or hypercalciuria and identify the molecular pathways resulting in this phenotype.