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Shell differentiation and engrailed expression in the Ilyanassa embryo

S M Moshel1, M Levine, J R Collier

  • 1Department of Biology, City University of New York, Brooklyn College, Brooklyn, New York 11210, USA.

Development Genes and Evolution
|June 26, 1998
PubMed
Summary
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The engrailed-related gene Ily-en is expressed in shell gland cells of Ilyanassa obsoleta embryos. Its expression is not solely dependent on the polar lobe, as it is present even in lobeless embryos.

Area of Science:

  • Developmental biology
  • Molecular genetics
  • Marine biology

Background:

  • The engrailed gene family plays crucial roles in embryonic development across various species.
  • Understanding the precise role of Ily-en in Ilyanassa obsoleta development is essential for comprehending shell formation.

Purpose of the Study:

  • To investigate the expression patterns of the Ily-en gene in Ilyanassa obsoleta embryos.
  • To determine the role of the polar lobe in regulating Ily-en expression and shell development.

Main Methods:

  • In situ hybridization was employed to detect Ily-en mRNA.
  • Immunocytochemistry using a monoclonal antibody (4D9) was used to identify the engrailed-class protein.
  • Analysis of normal and lobeless (vegetal cytoplasm deficient) Ilyanassa embryos.

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Main Results:

  • Ily-en expression was exclusively observed in shell gland cells.
  • Antisense probes for the Ily-en homeobox hybridized only to mRNAs in the shell gland.
  • The 4D9 antibody stained shell gland cells and shell-forming cells.
  • Lobeless embryos formed disorganized internal shell fragments, but Ily-en was still expressed.

Conclusions:

  • Ily-en is specifically expressed in the shell gland, indicating its role in shell formation.
  • The determinants for Ily-en expression are not exclusively localized in the polar lobe.
  • Ily-en expression occurs independently of complete polar lobe contribution to shell development.