Comparative biochemical studies of carotenoids in sea urchins—III. Relationship between developmental mode and carotenoids in the Australian echinoids Heliocidaris erythrogramma and H. tuberculata and a comparison with Japanese species

1995 ◽  
Vol 110 (4) ◽  
pp. 719-723 ◽  
Author(s):  
Miyuki Tsushima ◽  
Maria Byrne ◽  
Shonan Amemiya ◽  
Takao Matsuno
Keyword(s):  
Sea Urchins ◽  
Japanese Species ◽  
Heliocidaris Erythrogramma ◽  
Developmental Mode ◽  
Biochemical Studies

scholarly journals Evolution of abbreviated development in Heliocidaris erythrogramma dramatically re-wired the highly conserved sea urchin developmental gene regulatory network to decouple signaling center function from ultimate fate

2019 ◽  
Author(s):  
Allison Edgar ◽  
Maria Byrne ◽  
David R. McClay ◽  
Gregory A. Wray
Keyword(s):  
Early Development ◽  
Regulatory Networks ◽  
Molecular Mechanisms ◽  
Sea Urchins ◽  
Stabilizing Selection ◽  
Developmental Gene ◽  
Heliocidaris Erythrogramma ◽  
Signaling Center ◽  
Gene Regulatory ◽  
Ultimate Fate

AbstractDevelopmental gene regulatory networks (GRNs) describe the interactions among gene products that drive the differential transcriptional and cell regulatory states that pattern the embryo and specify distinct cell fates. GRNs are often deeply conserved, but whether this is the product of constraint inherent to the network structure or stabilizing selection remains unclear. We have constructed the first formal GRN for early development in Heliocidaris erythrogramma, a species with dramatically accelerated, direct development. This life history switch has important ecological consequences, arose rapidly, and has evolved independently many times in echinoderms, suggesting it is a product of selection. We find that H. erythrogramma exhibits dramatic differences in GRN topology compared with ancestral, indirect-developing sea urchins. In particular, the GRN sub-circuit that directs the early and autonomous commitment of skeletogenic cell precursors in indirect developers appears to be absent in H. erythrogramma, a particularly striking change in relation to both the prior conservation of this sub-circuit and the key role that these cells play ancestrally in early development as the embryonic signaling center. These results show that even highly conserved molecular mechanisms of early development can be substantially reconfigured in a relatively short evolutionary time span, suggesting that selection rather than constraint is responsible for the striking conservation of the GRN among other sea urchins.

Maternal factors and the evolution of developmental mode: Evolution of oogenesis in Heliocidaris erythrogramma

1999 ◽  
Vol 209 (5) ◽  
pp. 275-283 ◽  
Author(s):  
M. Byrne ◽  
Jeffrey T. Villinski ◽  
Paula Cisternas ◽  
Rebecca K. Siegel ◽  
Ellen Popodi ◽  
...  
Keyword(s):  
Maternal Factors ◽  
Heliocidaris Erythrogramma ◽  
Developmental Mode
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