Maternal and zygotic expression of a nanos-class gene in the leech Helobdella robusta: primordial germ cells arise from segmental mesoderm.

@article{Kang2002MaternalAZ,
  title={Maternal and zygotic expression of a nanos-class gene in the leech Helobdella robusta: primordial germ cells arise from segmental mesoderm.},
  author={Dongmin Kang and Marc Pilon and David A. Weisblat},
  journal={Developmental biology},
  year={2002},
  volume={245 1},
  pages={
          28-41
        }
}
The nanos-class gene of the leech Helobdella robusta (Hro-nos) is present as a maternal transcript whose levels decay during cleavage; HRO-NOS protein is more abundant in the D quadrant cells relative to the A, B, and C quadrants; and HRO-NOS is more abundant in the ectodermal precursor cell (DNOPQ) than in its sister mesodermal precursor (DM) (Pilon and Weisblat, 1997). Here, using in situ hybridization, we show that Hro-nos mRNA is broadly distributed throughout the zygote, is concentrated in… 
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Maternal expression of a NANOS homolog is required for early development of the leech Helobdella robusta.
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The results suggest that Hro-eve is important in regulating early cell divisions through early segmentation, and that it also plays a role in neuronal differentiation.
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TLDR
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TLDR
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nanos expression at the embryonic posterior pole and the medusa phase in the hydrozoan Podocoryne carnea
TLDR
The isolation of two orthologs of one such gene, nanos (nos), in the cnidarian Podocoryne carnea, a species with representative zoological features among the hydrozoans is reported, finding that the germline differentiates exclusively during medusa development, whereas the polyp does not contribute to the process.
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