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Monoclonal antibodies to sperm surface antigens of the brown alga Fucus serratus exhibit region-, gamete-, species- and genus-preferential binding

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Abstract

A panel of twelve monoclonal antibodies (MAbs), designated FS1 to FS12, have been raised against surface antigens of Fucus serratus sperm. The antibodies were selected on the basis that they show region-, gamete-, species- or genus-preferential binding. Indirect immunofluorescence shows that the antigens bound by the MAbs are distributed non-randomly over the cell surface. Seven MAbs (FS1, FS3, FS4, FS6, FS8, FS9, FS10) bind antigens located primarily on the cell body, while the others (FS2, FS5, FS7, FS11, FS12) bind antigens located primarily on the anterior flagellum. Of the MAbs that label the anterior flagellum, FS2, FS5, FS7 and FS12 form a ‘halo’ at the perimeter of the flagellum. Electron microscopic-immunogold studies indicate that the ‘halo’ results from labelling of the mastigonemes, as opposed to the flagellar plasmamembrane. Gamete-preferential binding of antibodies was detected using an enzyme-linked immunosorbent assay with egg membrane vesicles. Eight of the MAbs bind sperm antigens not common to eggs, though FS2, FS4, FS5 and FS9 bind antigens present on both sperm and eggs. In studies of species- and genus-specificity FS2, FS3, FS5, FS6, FS7, FS8, FS10, FS11 and FS12 exhibit genus-preferential binding, labelling sperm of F. serratus and F. vesiculosus more intensely than that of Ascophyllum nodosum. Only FS10 showed marked species-preferential binding, labelling sperm of F. serratus much more intensely than that of F. vesiculosus.

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Abbreviations

Au-GAMIG:

gold-conjugated goat anti-mouse immunoglobulin

ELISA:

enzyme-linked immunosorbent assay

EM:

electron microscope

FITC-RAMIG:

fluorescein-isothiocyanate-conjugated rabbit anti-mouse immunoglobulin

IIF:

indirect immunofluorescence

MAb:

monoclonal antibody

References

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Correspondence to J. R. Green.

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Jones, J.L., Callow, J.A. & Green, J.R. Monoclonal antibodies to sperm surface antigens of the brown alga Fucus serratus exhibit region-, gamete-, species- and genus-preferential binding. Planta 176, 298–306 (1988). https://doi.org/10.1007/BF00395410

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Key words

  • Cell surface
  • Fertilisation (recognition)
  • Fucus
  • Mastigoneme
  • Monoclonal antibody
  • Sperm (surface)