NHERF1 and hypophosphatemic nephrolithiasis/osteoporosis 2: Hypophosphatemic Rickets with Nephrolithiasis and Osteoporosis Type 2 (NPHLOP2), caused by an inactive mutation of SLC9A3R1 (also known as NHERF1), which encodes an adaptor protein that regulates several G protein-coupled receptors including PTH1R.