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Characterization of the gene encoding human platelet glycoprotein IX
1Hematology Section, Seattle Veterans Administration Hospital, Washington.
The Journal of Biological Chemistry
|February 15, 1993
Summary
The glycoprotein IX gene, crucial for platelet adhesion, was sequenced, revealing its three-exon structure. Regulatory elements in its promoter suggest shared control mechanisms with other platelet-specific genes.
Area of Science:
- Molecular Biology
- Hematology
- Genomics
Background:
- Glycoprotein IX is a key component of the glycoprotein Ib-IX complex on human platelets.
- This complex acts as the von Willebrand factor receptor, mediating platelet adhesion in arteries.
Purpose of the Study:
- To determine the genomic sequence of the human glycoprotein IX gene.
- To identify regulatory elements and structural features of the glycoprotein IX gene.
Main Methods:
- Isolation of human glycoprotein IX gene clones from a genomic library using a cDNA probe.
- Determination of the 3.2 kilobase genomic sequence.
- Identification of the transcriptional start site via RNase protection and primer extension.
Main Results:
- The glycoprotein IX gene comprises three exons and two introns within 1.6 kilobases of DNA.
- The complete open reading frame is located within the third exon.
- The gene shares exon sequences and intron positioning with the glycoprotein Ib alpha gene and contains GATA and ets regulatory elements in its promoter.
Conclusions:
- The glycoprotein IX gene shares structural similarities with other megakaryocyte-platelet genes.
- Consensus cis-acting regulatory elements in the promoter may control glycoprotein IX gene expression.