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, 2007; Haqq et al., 2005; Talantov, 2005; Smith, Hoek & Becker, 2005). Based on extensive gene expression profiling of melanoma cell lines in vitro, Hoek et al. proposed the 鈥榩henotype-switching鈥� model of melanoma that was independent of the degree of transformation or disease progression, and sought to explain the observation that melanoma cells altered between two states: those with high proliferative potential that are less invasive and those with high metastatic potential that are less proliferative. These separate but alternating states are controlled by different transcriptional programs and can be defined by specific gene signatures (Hoek et al., 2008a). Little Ones, Jobs Or LY2109761 MITF expression and many of its known targets (TYR, MLANA) define the 鈥榩roliferative鈥� Babies, Career As Well As Tubastatin A group, while the 鈥榠nvasive鈥� signature group is characterized by expression of negative regulators of the Wnt signalling pathway (WNT5A, DKK1, CTGF). CITED1 expression was associated with the proliferative pathway signature and subsequently confirmed in an updated and expanded data set to be significantly correlated with the proliferative phenotype (P it is a non-DNA binding nuclear transcriptional co-regulator capable of influencing TGF尾 induced transcription mediated by ligand-induced SMAD hetero-oligomerization; estrogen-dependent transcription mediated by ER伪, and Wnt/尾-Catenin-dependent transcription. These effects are dependent on CITED1-CBP/P300 binding via the conserved CITED family CR2 domain and while CITED1 is thought to act by stabilizing the CBP/P300-ER伪 interaction, in the case of 尾-Catenin it acts to repress transcription by competing for binding with CBP/P300 transcriptional co-activators (Shioda et al., 1998; Yahata et al., 2001; Yahata et al., 2000; Plisov, 2005). Microphthalmia-associated Girls, Job As Well As A Tubastatin A transcription factor, MITF, acts as a master-regulator of melanocyte differentiation and as a result has been intensely studied in the field of melanoma research (Widlund & Fisher, 2003; Levy, Khaled & Fisher, 2006). It is a basic helix-loop-helix leucine zipper transcription factor that recognizes E-box and M-box sequences in the promoter regions of its target genes. Highlighting its importance in the disease, amplification of MITF locus has been found in >15% of metastatic melanomas and germline mutations in MITF that predispose carriers to melanoma development have also been found (Garraway et al., 2005; Bertolotto et al., 2011; Yokoyama et al., 2011).