Two Mutations in Exon XII of the Protein Sα Gene in Four Thrombophilic Families Resulting in Premature Stop Codons and Depressed Levels of Mutated mRNA

Bente Damm Andersen; Bent Lind; Malou Philips; Annebirthe Bo Hansen; Jørgen Ingerslev; Sixtus Thorsen

doi:10.1055/s-0038-1650543

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 1996; 76(02): 143-150
DOI: 10.1055/s-0038-1650543

Original Article

Schattauer GmbH Stuttgart

Two Mutations in Exon XII of the Protein Sα Gene in Four Thrombophilic Families Resulting in Premature Stop Codons and Depressed Levels of Mutated mRNA

Bente Damm Andersen

¹The Section for Hemostasis and Thrombosis, Department of Clinical Biochemistry, The National University Hospital, Rigshospitalet, Copenhagen, Denmark

,

Bent Lind

¹The Section for Hemostasis and Thrombosis, Department of Clinical Biochemistry, The National University Hospital, Rigshospitalet, Copenhagen, Denmark

,

Malou Philips

¹The Section for Hemostasis and Thrombosis, Department of Clinical Biochemistry, The National University Hospital, Rigshospitalet, Copenhagen, Denmark

,

Annebirthe Bo Hansen

²The Department of Clinical Chemistry, University Hospital, Odense, Denmark

,

Jørgen Ingerslev

³The Department of Clinical Immunology, University Hospital, Aarhus, Denmark

,

Sixtus Thorsen

¹The Section for Hemostasis and Thrombosis, Department of Clinical Biochemistry, The National University Hospital, Rigshospitalet, Copenhagen, Denmark

› Author Affiliations

Abstract

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Summary

Sixteen Danish unrelated thrombophilic families with plasma protein S deficiency of type I (or III) are currently under investigation in our laboratory for defects in the protein Sα gene. The present paper describes a part of this work, which deals with the identification and phenotypical presentation of two unique mutations in exon XII of the protein Sa gene in four of these families. The mutations were identified by SSCP screening followed by nucleotide sequence analysis or by direct nucleotide sequence analysis. The mutation found in one family (D) is a novel deletion of an A in either the codon for Gly⁴⁴⁸ (GGA) or Iie⁴⁴⁹ (ATT) resulting in a frameshift and a premature stop codon at position 454. The other mutation shared by three families (F, G and J) is a previously reported C → T transition within a hypermutable CG dinucleotide sequence converting Arg⁴¹⁰ (CGA) to Stop (1GA). All affected individuals are heterozygotes for their mutation and in each family the protein S genotype, the plasma protein S phenotype (not shown for Family J) and the clinical phenotype cosegregate. The two mutations can fully explain the abnormal protein S phenotype since premature stop codons are known to disrupt gene function of the mutated allele. Analysis of protein S mRNA from platelets showed that both mutations result in a marked reduction in the amount of protein S mRNA from the mutated alleles indicating that the mutations exert their deleterious effects on gene expression at the transcriptional level. The Arg⁴¹⁰ → Stop mutation in Families F, G and J is in all instances linked to a G at the site of a common neutral dimorphism in the codon for Pro⁶²⁶ (CCA/G) in exon XV. This indicates that the mutation in these families could have arisen in a common ancestor. The Arg⁴¹⁰ (CGA) → Stop (1GA) mutation is also seen in exon XII of the normal protein Sa gene. This gives rise to the speculation as to whether the mutation in the protein Sa gene is the result of an interaction with the protein Sβ gene leading to double homologous unequal crossing-over or gene conversion of a short DNA sequence. However, this is unlikely since none of the 7 other protein S β-specific nucleotides are present in the mutated exon XII sequence of the protein Sα gene. The common Arg⁵⁰⁶ → Gin Leiden mutation in coagulation factor V is not an additional risk factor for thrombosis in any of the four families studied.

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References

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