The mechanism through which a transcription factor functions, and its regulatory effect (up-regulation or down-regulation) on a target gene, varies widely between transcription factors. The regulatory effect (and sometimes mechanism) of a specific transcription factor often varies depending on the target gene, and can sometimes even vary in response to other factors within the cell. | The mechanism through which a transcription factor functions, and its regulatory effect (up-regulation or down-regulation) on a target gene, varies widely between transcription factors. The regulatory effect (and sometimes mechanism) of a specific transcription factor often varies depending on the target gene, and can sometimes even vary in response to other factors within the cell. |