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Probing and rearranging the transcription factor network controlling the C. elegans endoderm

ABSTRACT The ELT-2 GATA factor is the predominant transcription factor regulating gene expression in the C. elegans intestine, following endoderm specification. We comment on our previous study (Wiesenfahrt et al., 2016) that investigated how the elt-2 gene is controlled by END-1, END-3 and ELT-7, the 3 endoderm specific GATA factors that lie upstream in the regulatory hierarchy. We also discuss the unexpected result that ELT-2, if expressed sufficiently early and at sufficiently high levels, can specify the C. elegans endoderm, replacing the normal functions of END-1 and END-3.