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DOI: 10.1055/s-0037-1614374
Two Distinct Mutations Cause Severe Hemophilia B in Two Unrelated Canine Pedigrees
Publication History
Received
00 November 1998
Accepted after revision
21 May 1998
Publication Date:
08 December 2017 (online)
Summary
The molecular defects causing severe factor IX deficiency were identified in two distinct canine breed-variants. Both defects were associated with an absence of plasma factor IX coagulant activity and antigen. A large deletion mutation was found in 1 breed variant, spanning the entire 5’ region of the factor IX gene extending to exon 6. An approximately 5 kb insertion disrupted exon 8 of the second breed-variant. This insertion was associated with alternative splicing between a donor site 5’ and acceptor site 3’ to the normal exon 8 splice junction, with introduction of a new stop codon. The resultant transcript lacked most of the factor IX catalytic domain and 3’ untranslated region. Molecular analyses of canine hemophilia B define an experimental model for study of inhibitor formation and gene therapy strategies, and provide insight into spontaneous mutation mechanisms in the factor IX gene and on the X chromosome of mammalian species.
1 Current address: Dr. Kunal Ray, Indian Institute of Chemical Biology, Jadavpur, Calcutta
2 Current address: Dr. Weikuan Gu, Molecular Genetics Center, JL Pettis Memorial VAMC and Loma Linda University, Loma Linda, CA, USA
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