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Mouse microcytic anaemia caused by a defect in the gene encoding the globin enhancer-binding protein NF-E2
L L Peters1, N C Andrews, E M Eicher
1Division of Hematology/Oncology, Children's Hospital, Boston, Massachusetts.
Nature
|April 22, 1993
Summary
The microcytosis (mk) mutation causes a missense mutation in the p45 NF-E2 gene, leading to impaired NF-E2 protein function. This impairment affects globin synthesis and iron metabolism, resulting in severe anemia.
Area of Science:
- Hematology
- Molecular Biology
- Genetics
Background:
- Nuclear factor erythroid 2 (NF-E2) is a transcription factor crucial for erythroid gene regulation.
- NF-E2 controls globin synthesis and genes involved in heme biosynthesis.
- The microcytosis (mk) mutation in mice is associated with severe anemia and iron absorption defects.
Purpose of the Study:
- To investigate if the mk mutation is located within the Nfe2 gene.
- To characterize the p45 NF-E2 gene and its DNA sequence in wild-type and mk alleles.
- To understand the molecular basis of anemia in mk mice.
Main Methods:
- DNA sequencing of the p45 NF-E2 gene in wild-type and mk mice.
- Analysis of p45 NF-E2 gene expression in different tissues and conditions.
- Characterization of the mutation's effect on the p45 NF-E2 protein.
Main Results:
- The mk allele contains a missense mutation (V173A) in the p45 NF-E2 gene.
- This mutation results in an altered p45 NF-E2 protein.
- p45 NF-E2 mRNA expression was detected in erythroid tissues and duodenum.
Conclusions:
- The mk mutation leads to an impaired NF-E2 protein.
- Impaired NF-E2 function disrupts globin production and iron metabolism.
- This study links Nfe2 gene mutations to severe microcytic anemia and iron absorption defects.