Details:
A series of molecular signals from the endoplasmic reticulum to the nucleus generated as a consequence of decreased levels of one or more sterols (and in some yeast, changes in oxygen levels) and which proceeds through activation of a sterol response element binding transcription factor (SREBP) to result in up-regulation of target gene transcription. [GOC:bf, GOC:mah, GOC:signaling, GOC:vw, PMID:12923525, PMID:22017871]