Related Experiment Videos
The human hypoxia-inducible factor 1alpha gene: HIF1A structure and evolutionary conservation
N V Iyer1, S W Leung, G L Semenza
1Departments of Pediatrics and Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland, 21287, USA.
Genomics
|October 23, 1998
Summary
The hypoxia-inducible factor 1 alpha (HIF1A) gene structure and regulation are conserved across species, suggesting evolutionary importance for cardiovascular development and oxygen homeostasis. Its promoter elements show high sequence identity between human and mouse genes.
Area of Science:
- Molecular Biology
- Genetics
- Cardiovascular Science
Background:
- The HIF1A gene encodes HIF-1alpha, a crucial transcription factor for cardiovascular development and oxygen (O2) homeostasis.
- HIF1A's structure, including intron-exon boundaries, is similar to the mouse Hif1a gene, but lacks specific mouse regulatory sequences.
Purpose of the Study:
- To investigate the evolutionary conservation of the HIF1A gene structure and its regulatory elements.
- To compare the promoter regions of human HIF1A and mouse Hif1a genes.
Main Methods:
- Sequence analysis of human HIF1A and mouse Hif1a genes, focusing on introns, exons, and 5' flanking regions.
- Transient expression assays to evaluate promoter activity of the 5' flanking sequences.
Main Results:
- Human HIF1A has 15 exons with introns at conserved positions compared to mouse Hif1a.
- Significant sequence identity (70% overall, 83% in proximal promoter) was found between human and mouse 5' flanking and untranslated regions.
- The 5' flanking region demonstrated strong promoter activity in transient expression assays.
Conclusions:
- The high degree of sequence conservation in the HIF1A gene and its regulatory regions suggests strong evolutionary selection.
- This conservation underscores the critical role of HIF1A in maintaining cardiovascular function and O2 homeostasis across species.