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Mouse alpha-1-microglobulin/bikunin precursor: cDNA analysis, gene evolution and physical assignment of the gene next
1Institut National de la Santé et de la Recherche Médicale, Unit-78, Boisguillaume, France.
Abstract:
alpha-1-Microglobulin (A1m) is a member of the lipocalin superfamily whereas bikunin is a Kunitz-type proteinase inhibitor. A1m and bikunin originate from a shared precursor. A comparison of mammalian cDNAs for the precursor indicates a highly conserved amino acid sequence along with muridae-specific deletions in both A1m and bikunin. In rodents, the gene for this precursor is less than 300 kb apart from the orosomucoid gene, another lipocalin gene. This precursor likely results from the assembly of two lipocalin and Kunitz-type genes, between 270 and 80 million years ago.
Insights
Alpha-1-Microglobulin (A1m) and bikunin, derived from a shared precursor, show conserved sequences with rodent-specific deletions. Their gene
Area of Science:
- Biochemistry
- Genetics
- Evolutionary Biology
Background:
- Alpha-1-Microglobulin (A1m) belongs to the lipocalin superfamily.
- Bikunin is identified as a Kunitz-type proteinase inhibitor.
- A1m and bikunin share a common precursor protein.
Purpose of the Study:
- To compare mammalian cDNAs of the A1m-bikunin precursor.
- To investigate evolutionary conservation and species-specific modifications.
- To understand the genomic organization and evolutionary origins of these genes.
Main Methods:
- Comparative cDNA analysis across mammalian species.
- Bioinformatic analysis of amino acid sequences.
- Genomic proximity analysis with the orosomucoid gene in rodents.
Main Results:
- Highly conserved amino acid sequences were observed in the precursor.
- Muridae-specific deletions were identified in both A1m and bikunin domains.
- The precursor gene is located near the orosomucoid gene in rodents.
Conclusions:
- The A1m-bikunin precursor exhibits significant evolutionary conservation.
- Rodent-specific genetic alterations highlight evolutionary divergence.
- The precursor likely arose from the fusion of lipocalin and Kunitz-type genes millions of years ago.