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Related Experiment Videos

Implications for dorsoventral axis determination from the zebrafish mutation janus

S Abdelilah1, L Solnica-Krezel, D Y Stainier

  • 1Cardiovascular Research Center, Massachusetts General Hospital, Charlestown 02129.

Nature
|August 11, 1994
PubMed
Summary

Zebrafish polarity mechanisms remain unclear. A mutation reveals that early cleavage planes and dorsoventral axis formation are independent processes, suggesting separate regulatory mechanisms control these fundamental developmental events.

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Area of Science:

  • Developmental biology
  • Genetics
  • Zebrafish (Danio rerio) research

Background:

  • The establishment of embryonic polarity, specifically the dorsoventral axis, is crucial for proper development in vertebrates.
  • The precise mechanisms governing dorsoventral axis formation and early embryonic patterning in zebrafish (Danio rerio) are not fully understood.

Purpose of the Study:

  • To investigate the genetic basis of dorsoventral polarity establishment in zebrafish.
  • To elucidate the relationship between early cleavage planes and the formation of the embryonic axis.

Main Methods:

  • Characterization of a novel zebrafish recessive maternal-effect mutation, janusm55.
  • Analysis of blastoderm morphology and goosecoid expression patterns in mutant embryos.
  • Cell tracing experiments in wild-type zebrafish embryos.

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Main Results:

  • The janusm55 mutation causes blastoderm division into two half-sized, detached blastoderms along the first cleavage plane.
  • Mutant embryos exhibit random positioning of the single organizer region relative to the initial cleavage plane.
  • Cell tracing indicates no fixed correlation between the dorsoventral axis and early cleavage planes in wild-type zebrafish.

Conclusions:

  • The formation of the dorsoventral axis and the orientation of early cleavage planes are regulated by independent mechanisms in zebrafish.
  • The janusm55 mutation provides a valuable tool for dissecting the genetic control of polarity in zebrafish development.