Shape changes in development: In addition to the molecules that determine cell fates, we are also interested in the cellular mechanisms that enable embryonic tissues to form the shape and organization of the tadpole.
While it is tempting to speculate that ROCK inhibition could slow peritoneal metastatic progression by blocking spheroid compaction and motile behavior of cancer cells, the observation that ROCK inhibition enabled embryonic stem cells [ 159] and prostate stem cells [ 160] to resist anoikis is noteworthy.
In addition, Arabidopsis miRNAs including miR160, miR166, and miR319 inhibit the expression of differentiation-promoting transcription factors such as ARF17, CNA, PHB, PHV, and TCP4 to enable proper embryonic patterning [ 66].
Nodine and Bartel [ 57] proposed that miRNAs enable proper embryonic patterning by preventing precocious expression of genes normally expressed during seed maturation, partially through miR156-mediated repression of SPL transcripts (SPL10 and SPL11).
Since a decrease in expression of let-7, a family of microRNAs tightly regulated during embryonic stem cell differentiation [34], enables self-renewal in embryonic stem cells [35], it appears as if self-renewal in incipient central memory T cells may result from a concomitant suppression of the let-7 family of microRNAs.
This coordinated radial configuration of polarized cells enables lumenogenesis and further embryonic development.
In horse chestnut seeds, vacuolar readiness in embryonic cells enables rapid germination.
Intriguingly, prolonged culturing of hESCs in their preferred in vitro conditions enables generation of an embryonic microniche that antagonizes the inhibitory influences of aged circulatory factors.
The HAC vector was constructed by minor modification of iHAC2, which enables reprogramming of mouse embryonic fibroblasts to pluripotency [ 25], and to change mouse p53-knockdown construct into a human version.
For example, in PS12 of WT embryos the tethering sequences upstream of the Abd-B m promoter enable the IAB7a and IAB7b embryonic enhancers to bypass the Fab-8 chromatin insulator and drive expression from the Abd-B m promoter (Fig. 4a).
