In high dimensional specifications, factor analysis (FA) may provide an avenue for structuring (co variance matrices, thus reducing the number of parameters needed for describing (co dispersion.
Alternatively, protocols for the enrichment of DA neurons from human and mouse ES cells without feeder cells require generation of retinoic acid treated EBs followed by exposure to midbrain specification factors such as SHH and FGF8 [5], [18] [19], [19].
We contrasted Nanog distribution with Gata6 and Gata4, specification factors for the hypoblast (Chazaud et al., 2006).
Cell fate determination is regulated in a step-wise fashion via the activation or inhibition of lineage specification factors (Pfister et al., 2007).
However, many of the genes whose expression is most markedly upregulated in serum, including germ layer specification factors, are not reported Myc targets.
The pluripotent condition may thus be viewed as a transcription factor battlefield in which Oct4, Sox2, and Nanog are dominant and continuously suppress functional expression and activity of lineage specification factors (Niwa, 2007; Smith, 2005) Crucially, however, Oct4 and Sox2 also provide for developmental extinction of pluripotency by directing expression of FGF4.
DOI: http://dx.doi.org/10.7554/eLife.07571.002 Lineage specification factors promote cellular differentiation by binding DNA regulatory elements to stably alter the local chromatin state and affect gene transcriptional outputs (Visel et al., 2009; Thurman et al., 2012; Nord et al., 2013; Ostuni et al., 2013).
The observation that these embryos are subsequently unable to properly form the TE lineage is consistent with a model in which expression of multiple lineage-specification factors interferes with the ability of a cell to resolve a lineage-appropriate gene expression programme.
Upon 10 days in culture in the presence of midbrain specification factors FGF8 and SAG (DA1 medium) cell polarity became evident and cells from the patient and control lines initiated the generation of neurites positive for β-III-Tubulin and MAP2 (early neuronal markers).
The T cell lineage specification factor TCF1 was also indispensable for the generation of IL-22 producing gut NKp46+ ILCs and restrained cytokine production by lymphoid tissue inducer-like effectors.
