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Dermal morphogenesis controls lateral line patterning during postembryonic development of teleost fish.

Hironori Wada1, Alain Ghysen, Chie Satou

  • 1Center for Transdisciplinary Research, Niigata University, Igarashi 2, Nishi-ku, Niigata 950-2181, Japan. hiwada@lab.nig.ac.jp

Developmental Biology
|February 23, 2010
PubMed
Summary

The lateral line system in fish develops accessory neuromasts through budding. Underlying dermal structures like bones and scales guide this process, influencing pattern evolution.

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Area of Science:

  • Developmental biology
  • Ichthyology
  • Evolutionary biology

Background:

  • The lateral line system in teleost fish exhibits diverse adult patterns.
  • Mechanisms driving this variability remain largely unknown.

Purpose of the Study:

  • Investigate the mechanisms behind lateral line pattern diversity in teleost fish.
  • Determine the role of postembryonic development and dermal structures in neuromast patterning.

Main Methods:

  • Utilized zebrafish and medaka models for comparative developmental studies.
  • Observed neuromast formation and positioning during postembryonic development.
  • Analyzed the correlation between neuromast development and underlying dermal structures (bones, scales).
  • Investigated the impact of genetic manipulation (endothelin 1 knockdown) on neuromast patterning.

Main Results:

  • Demonstrated serial budding of accessory neuromasts from existing neuromasts during zebrafish postembryonic development.
  • Established a strong correlation between accessory neuromast formation and the development of underlying dermal bones and scales.
  • Showcased stereotypic errors in neuromast budding and positioning in endothelin 1-knockdown zebrafish embryos, linked to opercular bone morphogenesis defects.
  • Identified a scale-specific lateral line pattern in medaka, absent in zebrafish, highlighting species-specific dermal influences.

Conclusions:

  • Postembryonic neuromast patterns in teleost fish are significantly influenced by underlying dermal structures.
  • Dermal control over neuromast patterning provides a potential explanation for the evolutionary diversification of lateral line systems.