Thromb Haemost 1997; 77(04): 610-615
DOI: 10.1055/s-0038-1656020
Clinical Studies
Schattauer GmbH Stuttgart

Compound Heterozygosity for Two Novel Missense Mutations in the Prothrombin Gene in a Patient with a Severe Bleeding Tendency

Authors

  • S R Poort

    1   The Hemostasis and Thrombosis Research Center, Department of Hematology, University Hospital Leiden, Leiden, The Netherlands
  • R Landolfi

    2   Instituto di Semeiotica Medica, Facoltà di Medicina e Chirurgia “Agostino Gemelli”, Università Cattolica del Sacro Cuore, Roma, Italy
  • R M Bertina

    1   The Hemostasis and Thrombosis Research Center, Department of Hematology, University Hospital Leiden, Leiden, The Netherlands
Further Information

Publication History

Received 12 August 1996

Accepted after resubmission 20 December 1996

Publication Date:
11 July 2018 (online)

Preview

Summary

The abnormal prothrombin gene of an Italian patient with a severe bleeding tendency and hypoprothrombinemia was selected for study and compared with the prothrombin genes of healthy controls. All the coding and their flanking regions and the 5ʹ- and 3ʹ-UT regions of the prothrombin gene were screened by analyzing the nucleotide sequence of the corresponding PCR products. The patient was found to be heterozygous for two novel point mutations: one at nucleotide 4251 in exon 6, which changes the codon for cysteine-138 (TGC) in the kringle 1 domain to that for tyrosine (TAC), and one at nucleotide 8812 in exon 10, which results in the replacement of tryptophan-357 (TGG) by cysteine (TGT) in the catalytic domain. Her mother was heterozygous for the Cys-138 Tyr mutation and her father heterozygous for the Trp-357 Cys mutation. Several other sequence variations were identified in the prothrombin genes from control individuals. Only the variations at nucleotide 4203 and 10253 could be established as polymorphisms.