Transcription factor that may regulate cell proliferation, migration and apoptosis. Involved in neural development and myogenesis. Transcriptional activator of MITF, acting synergistically with SOX10 (PubMed:21965087). {ECO:0000269|PubMed:16951170, ECO:0000269|PubMed:21965087}. This is the function of PAX3 (paired box 3, ENSG00000135903).