Transcriptional Regulation of X-Box-Binding Protein One (XBP1) by Hepatocyte Nuclear Factor 4α (HNF4α) is Vital to Beta-Cell Function.
The transcription factor, X-box Binding Protein-One (XBP1), controls the development and maintenance of the endoplasmic reticulum (ER) in multiple secretory cell lineages. We show here that Hepatocyte Nuclear Factor 4-alpha (HNF4α) directly induces XBP1 expression. Mutations in HNF4α cause Mature-Onset Diabetes of the Young I (MODYI), a subset of diabetes characterized by diminished GSIS. In mouse
