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How a single gene twists a snail.

Reiko Kuroda1

  • 1Research Institute for Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan rkuroda@rs.tus.ac.jp.

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Summary
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Chirality in Lymnaea snails is hereditary and determined maternally. Cytoskeletal dynamics during early development, not mirror images, dictate snail coiling direction, offering insights into gene-driven morphogenesis.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Evolutionary Biology

Background:

  • The gastropod Lymnaea exhibits unique, hereditary chirality (sinistrality/dextrality), making it a model for studying chiromorphogenesis.
  • Chirality is determined by a single maternal-effect gene acting early in embryonic development.
  • Both sinistral and dextral forms exist, with dextrality being the dominant natural form.

Purpose of the Study:

  • To investigate the underlying mechanisms of chiromorphogenesis in Lymnaea (L.) stagnalis.
  • To analyze the cytoskeletal dynamics during early embryonic development in relation to chirality.
  • To explore the genetic and developmental basis of handedness in snails.

Main Methods:

  • Performed controlled breeding experiments to study inheritance patterns of chirality.
  • Observed embryonic development in detail for both sinistral and dextral embryos.
  • Utilized fluorescent labeling of actin and microtubules to visualize cytoskeletal dynamics during cleavage stages.
  • Employed micromanipulation techniques at the third cleavage to alter blastomere arrangement.

Main Results:

  • Cytoskeletal dynamics during spiral cleavage are not mirror images between sinistral and dextral embryos.
  • Spiral deformation and spindle inclination were observed uniquely in dextral embryos and linked to the chirality gene.
  • Micromanipulation at the third cleavage successfully produced fertile snails with situs inversus.
  • Blastomere arrangement was found to regulate asymmetric nodal-Pitx gene expression, similar to vertebrates.

Conclusions:

  • The direction of snail coiling is determined by asymmetric cytoskeletal dynamics, not simple mirror imaging.
  • Early embryonic cell arrangement critically influences later gene expression patterns and overall body chirality.
  • Lymnaea stagnalis provides a valuable model for understanding how a single gene can control complex morphological traits like chirality.