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DOI: 10.1055/s-0038-1657884
Carrier Detection of Haemophilia B by Using an Intragenic Restriction-Fragment Length Polymorphism
Publikationsverlauf
Received 04. Februar 1985
Accepted 29. Mai 1985
Publikationsdatum:
18. Juli 2018 (online)
![](https://www.thieme-connect.de/media/10.1055-s-00035024/198502/lookinside/thumbnails/10-1055-s-0038-1657884-1.jpg)
Summary
We analysed DNA from individuals of five families with haemophilia B, including nineteen potential carriers. A genespecific probe was used to reveal a TaqI restriction-fragment length polymorphism. Segregation analysis of the polymorphic marker and the deleterious mutation within families allowed diagnosis at the gene level for 16 out of the 19 potential carriers, two proving to be carriers and 14 non-carriers. The obvious advantage is that lyonisation, which is a limiting factor when gene product (clotting factor IX) measurements are used for carrier detection, does not interfere with this procedure and that the result is a definitive diagnosis instead of a risk estimate. The method also permits prenatal diagnosis on chorionic villi in the first trimester of pregnancy.
Restriction-fragment length analysis, based upon the probe and restriction enzyme used in this study, will be informative for approximately 45% of the individuals at risk of carrying or transmitting the haemophilia B mutation.
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