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Dev Dyn 2019 Dec 01;24812:1273-1285. doi: 10.1002/dvdy.113.
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A tumor suppressor Retinoblastoma1 is essential for embryonic development in the sea urchin.

Fernandez-Nicolas A , Xu D , Yajima M .

BACKGROUND: Embryonic cells and cancer cells share various cellular characteristics important for their functions. It has been thus proposed that similar mechanisms of regulation may be present in these otherwise disparate cell types. RESULTS: To explore how regulative embryonic cells are fundamentally different from cancerous cells, we report here that a fine balance of a tumor suppressor protein Retinoblastoma1 (Rb1) and a germline factor Vasa are important for proper cell proliferation and differentiation of the somatic cells during embryogenesis of the sea urchin. Rb1 knockdown blocked embryonic development and induced Vasa accumulation in the entire embryo, while its overexpression resulted in a smaller-sized embryo with differentiated body structures. These results suggest that a titrated level of Rb1 protein may be essential for a proper balance of cell proliferation and differentiation during development. Vasa knockdown or overexpression, on the other hand, reduced or increased Rb1 protein expression, respectively. CONCLUSIONS: Taken together, it appears that Vasa protein positively regulates Rb1 protein while Rb1 protein negatively regulates Vasa protein, balancing the act of these two antagonistic molecules in somatic cells. This mechanism may provide a fine control of cell proliferation and differentiation, which is essential for regulative embryonic development.

PubMed ID: 31515896
PMC ID: PMC6889063
Article link: Dev Dyn
Grant support: [+]

Genes referenced: ddx4 LOC100887844 LOC115919910 LOC590297 srpl
Antibodies: cyiii Ab1 rb1 Ab1 rb1 Ab2 rb1 Ab3
Morpholinos: rb1cc1 MO1

References [+] :
Amato, RNAi mediated acute depletion of retinoblastoma protein (pRb) promotes aneuploidy in human primary cells via micronuclei formation. 2009, Pubmed