Including class III variations, we identified 3 more patients with biallelic variations in SLC34A3 and nephrolithiasis (n=1) or nephrocalcinosis (n=2) and 4 patients with biallelic SLC34A1 variations, 2 of them (patients 103 and 170) having nephrocalcinosis detected as hyperechogenic kidney in utero (21). Here, SLC34A1 is linked to nephrocalcinosis.