MmuALTA0012232-3/3 @ mm10

Formed by alternative RNA splicing in exon 7 (HsaALTA1036233), nurr1a has a truncated carboxy-terminus, nurr1b has an internal deletion in the ligand-binding domain and nurr1c, newly identified in this study, has a novel carboxy-terminus produced by a frame shift downstream of the splice junction. Alternative RNA splicing in exon 3 (HsaALTA0005820) produces the isoform known as the transcriptionally-inducible nuclear receptor (TINUR), lacking the amino-terminus (when the internal Alt3 is used). Nurr2 and the newly identified nurr2c are produced by utilization of both exon 3 and exon 7 alternative splice sites. Transfection studies in dopaminergic SK-N-AS cells demonstrate that nurr1a, nurr1b, nurr1c and TINUR have significantly reduced transcriptional activities compared with full-length nurr1, while nurr2 and nurr2c are inactive. Furthermore, in these experiments, nurr2 and nurr2c both act as dominant negatives.