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PCIF1 is a TRAF and POZ domain containing nuclear factor that interacts with and inhibits transactivation of pancreatic homeodomain transcription factor PDX-1. Here, we demonstrate interaction of endogenous PDX-1 and PCIF1 in MIN6 insulinoma cells. Within PCIF1, the TRAF and POZ domains are both required for physical and functional interaction with the C-terminus of PDX-1, whereas the C-terminal domain...
Brain 4 (Brn4/Pou3f4) and Pax6 are POU-homeodomain and paired-homeodomain transcription factors, respectively, that are expressed in the brain and the glucagon-expressing cells in the pancreas. Brn4 expression begins at embryonic day 10 in the pancreas, just before pax6 and both appear in the glucagon immunoreactive cells. At a later time point, E19, no Brn4 co-localization is observed with insulin...
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