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Related Experiment Videos

Knockdown of prothrombin in zebrafish.

Kenneth Day1, Naveen Krishnegowda, Pudur Jagadeeswaran

  • 1Department of Cellular and Structural Biology, The University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA.

Blood Cells, Molecules & Diseases
|February 6, 2004
PubMed
Summary

Prothrombin deficiency in zebrafish embryos caused developmental abnormalities and bleeding, mimicking effects seen in mice. This study establishes a zebrafish model for investigating thrombin

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Area of Science:

  • Biochemistry
  • Developmental Biology
  • Genetics

Background:

  • Thrombin, a serine protease derived from prothrombin, is crucial for blood coagulation and mammalian development.
  • Zebrafish serve as a valuable genetic model for studying hemostasis and developmental processes.
  • Understanding prothrombin's role is essential for comprehending coagulation and its impact on development.

Purpose of the Study:

  • To investigate the effects of prothrombin deficiency in zebrafish embryos using antisense morpholinos.
  • To establish a zebrafish model for studying thrombin's function in vertebrate development.
  • To characterize the phenotypes associated with reduced prothrombin levels.

Main Methods:

  • Utilized prothrombin-specific antisense morpholinos to knockdown prothrombin levels in zebrafish embryos.

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  • Observed and documented morphological abnormalities and bleeding phenotypes.
  • Performed laser-induced vascular injury assays to assess hemostasis.
  • Administered recombinant zebrafish prothrombin to confirm morpholino specificity.

    • Main Results:

    • Prothrombin knockdown resulted in early-onset severe abnormalities and later-onset bleeding phenotypes.
    • Observed phenotypes in zebrafish embryos closely resembled those of prothrombin knockout mice.
    • Vascular injury assays showed prolonged occlusion times in deficient larvae, which were normalized by recombinant prothrombin.
    • Demonstrated the specificity of the morpholino-induced prothrombin deficiency.

    Conclusions:

    • Prothrombin plays a critical role in zebrafish embryonic development and hemostasis.
    • The developed zebrafish model accurately reflects prothrombin deficiency phenotypes observed in mammals.
    • This system provides a powerful tool for future research into thrombin's functions in vertebrate development and coagulation.