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Updated: Jun 4, 2026
Mouse Fetal Liver Culture System to Dissect Target Gene Functions at the Early and Late Stages of Terminal Erythropoiesis
Published on: September 9, 2014
Targeted deletion of the mouse Mitoferrin1 gene: from anemia to protoporphyria
Marie-Berengere Troadec1, David Warner, Jared Wallace
1Department of Pathology, School of Medicine, University of Utah, 50 North Medical Drive, Salt Lake City, UT 84132, USA.
Abstract:
Mitoferrin1 is 1 of 2 homologous mitochondrial iron transporters and is required for mitochondrial iron delivery in developing erythroid cells. We show that total deletion of Mfrn1 in embryos leads to embryonic lethality. Selective deletion of Mfrn1 in adult hematopoietic tissues leads to severe anemia because of a deficit in erythroblast formation. Deletion of Mfrn1 in hepatocytes has no phenotype or biochemical effect under normal conditions. In the presence of increased porphyrin synthesis, however, deletion of Mfrn1 in hepatocytes results in a decreased ability to convert protoporphyrin IX into heme, leading to protoporphyria, cholestasis, and bridging cirrhosis. Our results show that the activity of mitoferrin1 is required to manage an increase in heme synthesis. The data also show that alterations in heme synthesis within hepatocytes can lead to protoporphyria and hepatotoxicity.
Insights
Mitoferrin1 (Mfrn1) is crucial for iron delivery in red blood cells, and its absence causes embryonic lethality or severe anemia. Hepatocyte Mfrn1 deletion leads to protoporphyria when heme synthesis increases.
Area of Science:
- Biochemistry
- Cell Biology
- Hematology
Background:
- Mitoferrin1 (Mfrn1) is a key mitochondrial iron transporter essential for heme synthesis.
- Mitochondrial iron transport is critical for erythropoiesis and overall cellular function.
Purpose of the Study:
- To investigate the physiological roles of Mitoferrin1 in vivo.
- To determine the consequences of Mfrn1 deletion in different cell types, specifically erythroid cells and hepatocytes.
Main Methods:
- Generation of Mfrn1-deficient mouse models using genetic deletion strategies.
- Analysis of embryonic lethality, hematopoietic function, and liver biochemistry.
- Assessment of heme synthesis and porphyrin metabolism under various conditions.
Main Results:
- Complete Mfrn1 deletion in embryos results in embryonic lethality.
- Selective Mfrn1 deletion in adult hematopoietic stem cells causes severe anemia due to impaired erythroblast formation.
- Mfrn1 deletion in hepatocytes shows no phenotype under normal conditions but leads to protoporphyria, cholestasis, and cirrhosis when heme synthesis is upregulated.
Conclusions:
- Mitoferrin1 is indispensable for erythroid development and managing increased heme synthesis.
- Disruptions in hepatic heme synthesis, even without Mfrn1 deficiency, can cause significant liver pathology, including protoporphyria and hepatotoxicity.
