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Media type:
E-Article
Title:
Expression of vasa, piwi, and nanos during gametogenesis in Typosyllis antoni (Annelida, Syllidae)
Contributor:
Ponz‐Segrelles, Guillermo;
Bleidorn, Christoph;
Aguado, M. Teresa
imprint:
Wiley, 2018
Published in:
Evolution & Development, 20 (2018) 5, Seite 132-145
Language:
English
DOI:
10.1111/ede.12263
ISSN:
1520-541X;
1525-142X
Origination:
Footnote:
Description:
<jats:sec><jats:label /><jats:p>Although model species have proven to be crucial for developmental biology, the evo‐devo approach requires a broader picture across phylogeny. Herein, we try to expand the range of studied annelids by presenting a transcriptome of <jats:italic>Typosyllis antoni</jats:italic> as a tool for the study of developmental and evolutionary processes in Syllidae. Moreover, we provide homologs of the stem‐cell markers <jats:italic>vasa</jats:italic>, <jats:italic>piwi</jats:italic>, and <jats:italic>nanos</jats:italic>, and investigate their expression patterns in gamete‐producing individuals for the first time in this group. We found no expression in females, while there is a distinct expression pattern in males. Based on this data, we argue that spermatogenesis starts in the gonads and finishes in the coelomic cavity, and it occurs simultaneously in a large number of segments. Surprisingly, no expression of the stem‐cell markers was found in the segment addition zone of these reproducing animals (stolonizing). Preliminary explanations like a lack of growth during stolonization, or the absence of a common genetic program between germ and somatic stem cells, are discussed. Finally, no reservoir of primordial cells has been detected, suggesting a possible epigenic origin of the Primordial Germ Cells of this species, though this hypothesis needs to be further investigated.</jats:p></jats:sec>