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Human islet amyloid polypeptide gene: complete nucleotide sequence, chromosomal localization, and evolutionary
1Department of Biochemistry and Molecular Biology, University of Chicago, Illinois.
Molecular Endocrinology (Baltimore, Md.)
|November 1, 1989
Summary
The human islet amyloid polypeptide (hIAPP) gene, found in pancreatic beta-cells, has been isolated and characterized. This gene encodes a single hormonal product, unlike related genes.
Area of Science:
- Molecular Biology
- Genetics
- Endocrinology
Background:
- Human islet amyloid polypeptide (hIAPP) is a 37 amino acid hormone-like polypeptide.
- hIAPP is expressed in the insulin-producing beta-cells of the endocrine pancreas.
Purpose of the Study:
- To isolate and characterize the gene encoding human islet amyloid polypeptide (hIAPP).
- To analyze the structure and genetic organization of the hIAPP gene.
- To determine the potential for alternative hormonal products from the hIAPP gene.
Main Methods:
- Gene isolation and characterization.
- Nucleotide and amino acid sequence analysis.
- Identification of transcriptional initiation site and gene localization.
Main Results:
- The hIAPP gene structure was elucidated, including exon-intron organization.
- Intron 2 analysis showed no homology to calcitonin/calcitonin-gene-related peptide genes.
- The hIAPP gene appears to produce only a single hormonal product.
- The transcriptional initiation site and chromosomal localization (12p12.3) were identified.
Conclusions:
- The hIAPP gene has a distinct structure compared to related genes.
- The hIAPP gene exclusively encodes a single hormonal product.
- Detailed characterization of the hIAPP gene provides a foundation for further research into its function and regulation.