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WTX encodes a tumor suppressor gene inactivated in Wilms tumor and recently implicated in WNT signaling through enhancement of cytoplasmic beta-catenin (CTNNB1) degradation. Here, we report that WTX translocates to the nucleus, a property that is modified by an endogenous splicing variant and is modulated by a nuclear export inhibitor. WTX is present in distinct subnuclear structures and co-localizes with the paraspeckle marker p54NRB/NONO, suggesting a role in transcriptional regulation. Notably, WTX binds WT1, another Wilms tumor suppressor and stem cell marker that encodes a zinc-finger transcription factor, and enhances WT1-mediated transcription of Amphiregulin, an endogenous target gene. Together, these observations suggest a role for WTX in nuclear pathways implicated in the transcriptional regulation of cellular differentiation programs.

The tumor suppressor WTX shuttles to the nucleus and modulates WT1 activity