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Updated: Jul 20, 2026

A Reporter Based Cellular Assay for Monitoring Splicing Efficiency
Published on: September 15, 2021
WT1 interacts with the splicing protein RBM4 and regulates its ability to modulate alternative splicing in vivo
M Andrea Markus1, Bettina Heinrich, Oleg Raitskin
1Basic & Clinical Genomics Laboratory, School of Medical Sciences and Bosch Institute, Building F13, The University of Sydney, NSW 2006, Australia.
Abstract:
Wilm's tumor protein 1 (WT1), a protein implicated in various cancers and developmental disorders, consists of two major isoforms: WT1(-KTS), a transcription factor, and WT1(+KTS), a post-transcriptional regulator that binds to RNA and can interact with splicing components. Here we show that WT1 interacts with the novel splicing regulator RBM4. Each protein was found to colocalize in nuclear speckles and to cosediment with supraspliceosomes in glycerol gradients. RBM4 conferred dose-dependent and cell-specific regulation of alternative splicing of pre-mRNAs transcribed from several reporter genes. We found that overexpressed WT1(+KTS) abrogated this effect of RBM4 on splice-site selection, whereas WT1(-KTS) did not. We conclude that the (+KTS) form of WT1 is able to inhibit the effect of RBM4 on alternative splicing.
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