- Nuclear speckle-associated protein Pnn/DRS binds to the transcriptional corepressor CtBP and relieves CtBP-mediated repression of the E-cadherin gene. Alpatov, R., Munguba, G.C., Caton, P., Joo, J.H., Shi, Y., Shi, Y., Hunt, M.E., Sugrue, S.P. Mol. Cell. Biol. (2004)