The NUT gene is found on chromosome 15q14 and encodes for the NUT protein which is a key component of the RNA polymerase II Mediator complex. This multi-subunit assembly is required for all RNA pol II-dependent transcriptional activation, coordinating both nuclear and mitochondrial gene transcription. The complex also includes pol II, and transcription factors TFIIA-F. It serves as a central scaffold within the pre-initiation complex (PIC) responsible for converting biological stimuli (in the form of transcription factors) into gene expression responses. A good review of Mediator function and influencing factors can be found in Poss et al1.
Additionally, the poorly understood disease known as NUT midline carcinoma (NMC) is a rare and aggressive squamous carcinoma involving chromosomal rearrangements that generate a NUT protein fused with either one of the bromodomain-containing proteins BRD4 and BRD32. A research group from Sweden believes that the Mediator complex may have also have a different role in telomeric silencing and cell senescence and lifespan determination3. They found that Mediator directly associates with telomeric heterochromatin between active and inactive content.
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PMIDs