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Molecular characterization of three novel splicing mutations causing factor V deficiency and analysis of the F5 gene

Claudia Dall'Osso1, Ilaria Guella, Stefano Duga

  • 1Department of Biology and Genetics for Medical Sciences, University of Milan, via Viotti 3/5, 20133 Milan, Italy.

Haematologica
|August 30, 2008
PubMed

Insights

Three novel splicing mutations in the factor V gene (F5) cause factor V deficiency. These mutations lead to altered F5 mRNA splicing and degradation, impacting bleeding disorder severity.

Area of Science:

  • Genetics
  • Molecular Biology
  • Hematology

Background:

  • Factor V deficiency is a rare, autosomal recessive hemorrhagic disorder with variable bleeding severity.
  • Understanding the molecular basis of factor V deficiency is crucial for diagnosis and potential therapeutic strategies.

Purpose of the Study:

  • To investigate the molecular basis of factor V deficiency in three patients.
  • To perform a comprehensive analysis of the factor V gene (F5) splicing pattern.

Main Methods:

  • Mutational screening using DNA sequencing.
  • Expression of wild-type and mutant F5 mRNA in COS-1 cells.
  • Analysis of mRNA splicing and degradation using RT-PCR and sequencing.

Main Results:

  • Identified three novel splicing mutations: IVS8+6T>C, IVS21+1G>A, and IVS24+1_+4delGTAG.
  • Demonstrated that mutations activate cryptic splice sites or cause exon skipping (F5-Delta 8-mRNA).
  • Confirmed nonsense-mediated mRNA decay (NMD) degrades transcripts with premature termination codons (PTCs).

Conclusions:

  • Elucidated the functional consequences of three splicing mutations causing factor V deficiency.
  • Identified three alternatively spliced F5 transcripts, including physiologically occurring exon-8 skipping.
  • Highlighted the role of NMD in regulating F5 mRNA levels.
Abstract

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