[No authors listed]
Rnf33 and Rnf35 are mouse RING finger protein genes that are transcribed temporally in the preimplantation mouse embryo, predominantly at the two-cell embryonic stage. The genes are juxtaposed in a 20-kb genomic region and are both intronless except for a single intron in the 5' untranslated region (5'-UTR). Based on analysis of the Rnf33/35 genomic sequence and cDNA sequences derived by in silico mining, we found that the Rnf33 and Rnf35 mRNAs are apparently transcribed from the same putative promoter and may be products of alternative splicing of the same pre-mRNA generated through differential 3' cleavage and polyadenylation. We also detected a second variant of Rnf35 in two-cell embryo generated through a second splicing event using an unconventional 5' splice junction. Our observations on the mode of transcription of Rnf33 and Rnf35 are consistent with the hypothesis that transcription of zygotic genes is promiscuous, and that the solo 5'-UTR intron may serve to facilitate efficient translation.
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