OLIG2

Overview

OLIG2 (oligodendrocyte transcription factor 2) is a bHLH transcription factor essential for oligodendrocyte and motor neuron development. It is one of the most consistently expressed transcription factors in gliomas and is used diagnostically as an oligodendrocytic lineage marker. In oligodendroglioma, OLIG2 marks differentiated oligodendrocyte-like cells within the tumor’s developmental hierarchy.

Alterations observed in the corpus

  • OLIG2 is highly expressed in differentiated oligodendrocyte-like tumor cells in grade II oligodendroglioma (IDH-mutant, 1p/19q codeleted), alongside OLIG1 and OMG; the combined PCA across 4,347 cells identified the oligodendrocytic program (OLIG1/OLIG2/OMG-high) as one of two dominant glial lineage programs PMID:27806376.

Cancer types (linked)

  • ODG — OLIG2 is a defining lineage marker of the oligodendrocyte-like compartment in oligodendroglioma; co-expressed with OLIG1 and OMG in the differentiated non-proliferating fraction PMID:27806376.

Co-occurrence and mutual exclusivity

  • Co-expressed with OLIG1 and OMG in oligodendrocyte-like cells; mutually exclusive with astrocyte-like program (GFAP, APOE, SOX9) at the single-cell level PMID:27806376.

Therapeutic relevance

  • OLIG2+ differentiated cells are non-proliferating; stem/progenitor cells at the apex of the hierarchy are the likely source of tumor regrowth and represent the priority therapeutic target PMID:27806376.

Open questions

  • Whether OLIG2 expression in oligodendroglioma reflects the tissue of origin or is maintained by the IDH mutation/1p19q codeletion epigenetic context is not addressed PMID:27806376.

Sources

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