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The yeast ATM1 protein is essential for normal mitochondrial iron homeostasis. Deletion of ATM1 results in mitochondrial iron accumulation and oxidative mitochondrial damage. Mutations in ABC7, the human homolog of ATM1, result in X-linked sideroblastic anemia and ataxia. Here we show that a deletion of ATM1 also has effects on extra-mitochondrial iron metabolism. ATM1-deficient cells have an increased...