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Blood Coagul Fibrinolysis. 1994 Oct;5(5):841-4.

Prothrombin Padua I: incomplete activation due to an amino acid substitution at a factor Xa cleavage site.

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  • 1Department of Biochemistry, University of Texas Health Center at Tyler 75710.


An individual and an affected brother previously identified as having the variant prothrombin Padua I were studied in order to identify underlying genetic defects. A heterozygous mutation in the prothrombin gene exon 8 was identified as substitution of A for G at nucleotide position 7,312 (Arg271 (CGT) to His (CAT)). An abolished RsaI restriction site was used to confirm heterozygosity for the defect. Lack of the requisite cleavage of the His271-Thr272 bond in prothrombin Padua I could prevent release of fragment 2 and block the conversion of the intermediate meizothrombin des fragment 1 to alpha-thrombin, providing an explanation of reduced potential for clotting activity and for the observed mild bleeding tendency.

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