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Review

Nature Reviews Cancer 5, 956–964 (1 December 2005) | doi:10.1038/nrc1752

A role for Kaiso|[ndash]|p120ctn complexes in cancer?

Frans M. van Roy & Pierre D. McCrea

Kaiso belongs to the zinc finger and broad-complex, tramtrack and bric-a-brac/poxvirus and zinc finger (BTB/POZ) protein family that has been implicated in tumorigenesis. Kaiso was first discovered in a complex with the armadillo-domain protein p120ctn and later shown to function as a transcriptional repressor. As p120ctn seems to relieve Kaiso-mediated repression, its altered intracellular localization in some cancer cells might result in aberrant Kaiso nuclear activity. Intriguingly, Kaiso's target genes include both methylated and sequence-specific recognition sites. The latter include genes that are modulated by the canonical Wnt (β-catenin–T-cell factor) signalling pathway. Further interest in Kaiso stems from findings that its cytoplasmic versus nuclear localization is modulated by complex cues from the microenvironment.