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Fibroblast growth factor 23 (FGF23) gain of function mutations can lead to autosomal dominant hypophosphatemic rickets (ADHR) disease onset at birth, or delayed onset following puberty or pregnancy. We previously demonstrated that the combination of iron deficiency and a knock‐in R176Q FGF23 mutation in mature mice induced FGF23 expression and hypophosphatemia that paralleled the late‐onset ADHR phenotype. Because anemia in pregnancy and in premature infants is common, the goal of this study was to test whether iron deficiency alters phosphate handling in neonatal life. Wild‐type (WT) and ADHR female breeder mice were provided control or iron‐deficient diets during pregnancy and nursing. Iron‐deficient breeders were also made iron replete. Iron‐deficient WT and ADHR pups were hypophosphatemic, with ADHR pups having significantly lower serum phosphate (p < 0 …