BRN3B, class 4, transcription factor 2, Brain specic homeobox/POU domain protein 3B, Brain-3B, Brain-specic homeobox/POU domain protein 3B, Brn-3B, BRN3.2, Brn3b POU domain transcription factor, PO4F2_HUMAN, POU class 4 homeobox 2, POU domain, POU domain class 4 transcription factor 2, POU domain protein, POU4F2.
The Brn family of transcription factors are found in a highly restricted subset of neurons and are critical to the early embryonic development of the central nervous system. Brn-1 and Brn-2 are class III POU (Pit-Oct-Unc) domain proteins, whereas Brn-3 is a class IV POU domain protein. Three Brn-3 proteins have been described and are designated Brn-3a, Brn-3b and Brn-3c. While Brn-3a and Brn-3c stimulate transcription, Brn-3b generally functions as a transcriptional repressor. However, Brn-3b, but not Brn-3a, has been shown to regulate the expression of the acetylcholine receptor. Interestingly, Brn-3a has two functional transactivating domains, one at the amino-terminus and one at the carboxy-terminus. Brn-2 is thought to be involved in smooth muscle cell development and differentiation.
