Constitutional activation of BMP4 and WNT signalling in hESC results in impaired mesendoderm differentiation
Markouli, C.; Couvreu De Deckersberg, E.; Dziedzicka, D.; Regin, M.; Franck, S.; Keller, A.; Gheldof, A.; Geens, M.; Sermon, K.; Spits, C.
Show abstract
We identified a human embryonic stem cell subline that fails to respond to the differentiation cues needed to obtain mesendoderm derivatives, differentiating into trophoblast-like cells instead. RNA-sequencing analysis showed that the subline has hyperactivation of the WNT and BMP4 signalling. Modulation of these pathways with small molecules confirmed them as the cause of the differentiation impairment. While activation of WNT and BMP4 in control cells resulted in a loss of mesendoderm differentiation and induction of trophoblast markers, inhibition of these pathways in the subline restored its ability to differentiate. Karyotyping and exome sequencing analysis did not identify any changes in the genome that could account for the pathway deregulation. These findings add to the increasing evidence that different responses of stem cell lines to differentiation protocols are based on genetic and epigenetic factors, inherent to the line or acquired during cell culture.
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