Thromb Haemost 2002; 88(01): 144-148
DOI: 10.1055/s-0037-1613167
Review Article
Schattauer GmbH

A Single Thymine Nucleotide Deletion Responsible for Congenital Deficiency of Plasmin Inhibitor

Haruhiko Yoshinaga
1   Department of Hematology
,
Masako Nakahara
2   Graduate School of Allied Health Sciences, Tokyo Medical and Dental University, Tokyo, Japan
,
Takatoshi Koyama
1   Department of Hematology
2   Graduate School of Allied Health Sciences, Tokyo Medical and Dental University, Tokyo, Japan
,
Aya Shibamiya
2   Graduate School of Allied Health Sciences, Tokyo Medical and Dental University, Tokyo, Japan
,
Fumie Nakazawa
2   Graduate School of Allied Health Sciences, Tokyo Medical and Dental University, Tokyo, Japan
,
Lindsey A. Miles
3   Department of Cell Biology, The Scripps Research Institute, La Jolla, CA, USA
,
Shinsaku Hirosawa
1   Department of Hematology
,
Nobuo Aoki
1   Department of Hematology
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Publikationsverlauf

Received 20. Dezember 2001

Accepted after resubmission 18. April 2002

Publikationsdatum:
09. Dezember 2017 (online)

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Summary

Plasma plasmin inhibitor (PI) is a physiological inhibitor of plasminmediated fibrinolysis and constitutes a hemostatic component in blood plasma; hence its deficiency results in a severe hemorrhagic diathesis. We have carried out molecular analysis of American family members with congenital PI deficiency, and detected a single thymine deletion at nucleotide position 332 in exon 5. The deletion was found in both alleles of the homozygotes and in one allele of the heterozygotes, and the patterns of restriction fragment length polymorphism created by the mutation in the family members were compatible with their phenotypes. The deletion caused a frameshift leading to an alteration and shortening of the deduced amino acid sequence. The amino acid sequence consists of the first 83 amino acids of the N-terminal sequence of the normal PI and additional new amino acids, resulting in a mutant composed of 94 amino acids in contrast to 464 amino acids of the normal PI. In transient expression analysis, the mutant PI whose molecular size was compatible with the predicted amino acid sequence was detected in the lysates of the cells transfected with the mutated PI expression vector. The mutant PI was retained and underwent progressive degradation within the cells, and was minimally excreted into the media. These data indicate that this mutation is the cause of PI deficiency in this pedigree.