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Molecular characterization of human factor XSan Antonio
1Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio.
Blood
|October 1, 1989
Summary
Researchers identified two genetic mutations in a patient with factor X deficiency, revealing the molecular basis of the condition. This discovery enables precise carrier detection and antenatal diagnosis for affected families.
Area of Science:
- Molecular Biology
- Genetics
- Hematology
Background:
- Factor X deficiency is a rare bleeding disorder.
- Understanding the molecular basis is crucial for diagnosis and treatment.
Purpose of the Study:
- To characterize the genetic mutations causing factor X deficiency in a patient.
- To establish molecular diagnostic methods for affected families.
Main Methods:
- Enzymatic DNA amplification to isolate factor X gene regions.
- DNA sequencing to identify mutations.
- Restriction digestion for mutation analysis.
Main Results:
- Identified a compound heterozygote with 14% factor X activity.
- Discovered a missense mutation (Arg366Cys) in exon VIII affecting the catalytic domain.
- Found a frameshift mutation (deletion in exon VII) leading to premature termination.
- The missense mutation creates an ApaL1 site and abolishes a HinP1 site.
Conclusions:
- The identified mutations, Factor XSan Antonio, are the first molecular characterization of factor X deficiency.
- Enzymatic amplification and restriction digestion offer a reliable method for carrier and prenatal diagnosis.