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Heterogeneity of the Factor IX Locus in Nine Hemophilia B Inhibitor Patients

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Journal J Clin Invest
Specialty General Medicine
Date 1987 Mar 1
PMID 3029178
Citations 5
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Abstract

DNA from nine hemophilia B patients who produce anti-factor IX inhibitors (antibodies), including two brothers, was analyzed by the Southern blotting method and hybridization with factor IX cDNA, intragenomic, and 3'-flanking probes. Two inhibitor patients were shown to have total deletions of the factor IX gene. Two other inhibitor patients, the brothers, were shown to have a presumably identical complex rearrangement of the factor IX gene involving two separate deletions. The first deletion is of approximately 5.0 kb and removes exon e. The second deletion is between 9 and 29 kb and removes exons g and h but leaves exon f intact. An abnormal Taq I fragment at one end of the deletion junctions acted as a marker for the inheritance of hemophilia B in the patients' family. Five other inhibitor patients have a structurally intact factor IX gene as detected by this method. Our studies indicate that whereas large structural factor IX gene defects predispose hemophilia B patients to developing an anti-factor IX inhibitor, the development of an inhibitor can be associated with other defects of the factor IX gene.

Citing Articles

Carrier detection through the use of abnormal deletion junction fragments in a case of haemophilia B involving complete deletion of the factor IX gene.

Matthews R, Peake I, Bloom A, Anson D J Med Genet. 1988; 25(11):779-80.

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Molecular studies of haemophilia B in Sweden. Identification of patients with total deletion of the factor IX gene and without inhibitory antibodies.

Wadelius C, Blomback M, Pettersson U Hum Genet. 1988; 81(1):13-7.

PMID: 2848757 DOI: 10.1007/BF00283721.


A complete deletion of the factor IX gene and new TaqI variant in a hemophilia B kindred.

Taylor S, Lillicrap D, Blanchette V, Giles A, Holden J, White B Hum Genet. 1988; 79(3):273-6.

PMID: 2841226 DOI: 10.1007/BF00366250.


Identification of a single nucleotide C-to-T transition and five different deletions in patients with severe hemophilia B.

Ludwig M, Schwaab R, Eigel A, Horst J, Egli H, Brackmann H Am J Hum Genet. 1989; 45(1):115-22.

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