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cDNA cloning, structural organization, and expression of the sheep NRAMP1 gene
V Bussmann1, I Lantier, F Pitel
1Pathologie Infectieuse et Immunologie, INRA de Tours-Nouzilly, 37380 Nouzilly, France.
Abstract:
Mouse resistance to several intracellular pathogens including Mycobacteria, Leishmania, and Salmonella is under the control of the Chromosome (Chr) 1 Natural Resistance Associated Macrophage Protein I gene (Nramp1). This gene could have an economic and health importance for domestic animals and humans as well. Therefore, equivalents of the NRAMP1 gene have been cloned by several research groups in various animal species. To study in sheep the influence of the NRAMP1 gene on the susceptibility to intracellular pathogens induced diseases, we have cloned the sheep NRAMP1 cDNA by screening a splenic cDNA library. The genomic organization of the sheep NRAMP1 gene was then determined by sequencing the exon/intron boundaries. The transcription start points (tsp) from the NRAMP1 mRNA have been located with primer extension experiments. RT-PCR reactions have been used to determine the profile of mRNA expression of this gene.
Insights
Researchers cloned the sheep Natural Resistance Associated Macrophage Protein I (Nramp1) gene to study its role in disease resistance. This work is crucial for improving livestock health and understanding genetic disease resistance mechanisms.
Area of Science:
- Immunogenetics
- Animal Genomics
- Molecular Biology
Background:
- The Natural Resistance Associated Macrophage Protein I (Nramp1) gene on Chromosome 1 controls resistance to intracellular pathogens in mice.
- Nramp1 has potential economic and health significance in domestic animals and humans.
- Cloning Nramp1 equivalents in various animal species is essential for understanding its function.
Purpose of the Study:
- To clone the sheep Nramp1 cDNA.
- To investigate the genomic organization of the sheep Nramp1 gene.
- To analyze the expression profile of the sheep Nramp1 gene in relation to disease susceptibility.
Main Methods:
- Screening of a splenic cDNA library to isolate sheep Nramp1 cDNA.
- Sequencing of exon/intron boundaries to determine genomic organization.
- Primer extension experiments to locate transcription start points (tsp) of Nramp1 mRNA.
- RT-PCR to analyze mRNA expression patterns.
Main Results:
- Successfully cloned the sheep Nramp1 cDNA.
- Determined the genomic organization, including exon/intron boundaries.
- Identified transcription start points of the Nramp1 mRNA.
- Characterized the mRNA expression profile of the sheep Nramp1 gene.
Conclusions:
- The cloning and characterization of sheep Nramp1 provide a foundation for studying its role in resistance to intracellular pathogens.
- Understanding sheep Nramp1 function can contribute to developing strategies for disease resistance in livestock.
- This research highlights the importance of Nramp1 in animal health and disease management.