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Identification and characterization of a second mouse Nramp gene
S Gruenheid1, M Cellier, S Vidal
1Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
Genomics
|January 20, 1995
Summary
Researchers identified a new mouse gene, Nramp2, which is homologous to the Nramp gene involved in host resistance. Nramp2 is expressed in various tissues and mapped to mouse chromosome 15.
Area of Science:
- Genetics
- Molecular Biology
- Immunology
Background:
- The Nramp gene is a candidate for the Bcg/Ity/Lsh locus controlling natural resistance in mice.
- Host resistance genes play a crucial role in innate immunity against various infections.
Purpose of the Study:
- To isolate and characterize a second mouse Nramp gene, Nramp2.
- To analyze the Nramp2 gene's homology, expression, and chromosomal location.
Main Methods:
- Cross-hybridization using cDNA clones.
- Nucleotide and amino acid sequence analysis.
- Northern blotting for mRNA distribution.
- Genetic mapping using a polymorphic dinucleotide repeat.
Main Results:
- Nramp2 is a novel gene homologous to Nramp, forming a small gene family.
- Nramp2 encodes an integral membrane protein with significant structural similarity to Nramp.
- Nramp2 mRNA is expressed at low levels in all tested mouse tissues, unlike the macrophage-specific Nramp.
- Nramp2 was mapped to mouse chromosome 15.
Conclusions:
- Nramp2 represents a distinct but related gene to Nramp, potentially involved in host defense mechanisms.
- The widespread expression pattern of Nramp2 suggests roles beyond macrophage-specific immunity.
- The characterization of Nramp2 provides insights into the Nramp gene family and host resistance.