FUS is a multifunctional protein that plays a role in transcriptional regulation and mRNA processing. It binds to DNA to make new proteins and splices mRNA before transporting it out of the nucleus to the cytoplasm in the cells, where it can be further processed by other structures. FUS can also help in DNA repair to prevent genetic damage.
While FUS may aid in transcriptional activation and is associated with gene-specific transcription factors, FUS itself is not a transcription factor. Transcription factors are the specific proteins that help transcribe DNA into RNA.