Abstract
We previously described two isoforms (MOVO-A and -B) of a novel zinc finger protein MOVO, a mouse homologue of Drosophila Ovo protein. Here, we isolated cDNA encoding the third isoform MOVO-C, which had a transactivation domain and zinc finger domain, but lacked an N-terminal potential repression domain that was present in MOVO-A. Three isoform mRNAs were expressed highly in mouse testis and also in the ovary at lower levels. The structural analyses of the isolated Movo gene and mRNAs demonstrated that three different Movo transcripts were differentially processed to generate three isoforms. Major mRNA species encoded MOVO-B with a zinc finger domain alone, and minor mRNA species encoded MOVO-A (potential repressor) and MOVO-C (potential activator). To assign MOVO to a transcriptional factor, we characterized DNA-binding and transactivation properties. Random oligonucleotide selection, electrophoretic mobility shift assay and footprinting indicated that MOVO bound to the sequence, 5'-G(G/C/T)GGGGG-3'. These motifs were found in the 5'-flanking regions of Movo and other testis-specific genes. Nuclear proteins binding to this motif were detected in mouse testis, and the expression of MOVO mRNA was restricted in spermatocytes. The...Continue Reading
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