Abstract：
:Specification of the primordial germ cells (PGCs) is essential for sexually reproducing animals. Although the mechanisms of PGC specification are diverse between organisms, the RNA binding protein Nanos is consistently required in the germ line in all species tested. How Nanos is selectively expressed in the germ line, however, remains largely elusive. We report that in sea urchin embryos, the early expression of Nanos2 in the PGCs requires the maternal Wnt pathway. During gastrulation, however, Nanos2 expression expands into adjacent somatic mesodermal cells and this secondary Nanos expression instead requires Delta/Notch signaling through the forkhead family member FoxY. Each of these transcriptional regulators were tested by chromatin immunoprecipitation analysis and found to directly interact with a DNA locus upstream of Nanos2. Given the conserved importance of Nanos in germ line specification, and the derived character of the micromeres and small micromeres in the sea urchin, we propose that the ancestral mechanism of Nanos2 expression in echinoderms was by induction in mesodermal cells during gastrulation.
journal_name
Dev Bioljournal_title
Developmental biologyauthors
Oulhen N,Swartz SZ,Wang L,Wikramanayake A,Wessel GMdoi
10.1016/j.ydbio.2019.04.010subject
Has Abstractpub_date
2019-08-01 00:00:00pages
34-42issue
1eissn
0012-1606issn
1095-564Xpii
S0012-1606(19)30203-9journal_volume
452pub_type
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