NRF1 and autosomal dominant medullary cystic kidney disease with or without hyperuricemia: Entrapment of NRF1 in the hyperplastic ER of TAL cells in ADTKD-UMOD associated with accumulation of glycosylated 120-kDa NRF1 isoform is consistent with impaired maturation, processing and activation of NRF1 in ADTKD-UMOD.