SLC34A1 and nephrocalcinosis: Homozygous SLC34A1 mutations cause autosomal recessive Fanconi syndrome, nephrocalcinosis and kidney insufficiency, and infantile idiopathic hypercalcemia with vitamin D hypersensitivity.[2,8,9] Both recessive and dominant inheritance of SLC34A1 gene mutations have been found in families with nephrolithiasis/nephrocalcinosis.[10] Heterozygous mutations of SLC34A1 have been reported to be linked with hypophosphatemia, although with inconsistent results.[4,5] It is not uncommon that different genetic patterns caused by the same gene.