Project description:Analyses of new genomic, transcriptomic or proteomic data commonly result in trashing many unidentified data escaping the ‘canonical’ DNA-RNA-protein scheme. Testing systematic exchanges of nucleotides over long stretches produces inversed RNA pieces (here named “swinger” RNA) differing from their template DNA. These may explain some trashed data. Here analyses of genomic, transcriptomic and proteomic data of the pathogenic Tropheryma whipplei according to canonical genomic, transcriptomic and translational 'rules' resulted in trashing 58.9% of DNA, 37.7% RNA and about 85% of mass spectra (corresponding to peptides). In the trash, we found numerous DNA/RNA fragments compatible with “swinger” polymerization. Genomic sequences covered by «swinger» DNA and RNA are 3X more frequent than expected by chance and explained 12.4 and 20.8% of the rejected DNA and RNA sequences, respectively. As for peptides, several match with “swinger” RNAs, including some chimera, translated from both regular, and «swinger» transcripts, notably for ribosomal RNAs. Congruence of DNA, RNA and peptides resulting from the same swinging process suggest that systematic nucleotide exchanges increase coding potential, and may add to evolutionary diversification of bacterial populations.
Project description:Biochemistry suggests e2f4 forms a complex with the coiled-coiled protein multicilin (MCIDAS), a protein that is necessary and sufficient to specify multiciliated cells in vertebrates. Here, we performed RNAseq on Xenopus laevis ectoderm in the presence of multicilin alone or multicilin and a dominant-negative e2f4 construct. We also performed ChIPseq on e2f4 in the presence or absence of multicilin. Taken together, these data demonstrate how multicilin affects e2f4 genomic targets and their downstream transcription. RNAseq: misexpression of multicilin-HGR +/- dominant-negative e2f4 messenger RNAs in X. laevis animal caps, multicilin induced with dexamethasone at mid-stage 11 and harvested at 3 timepoints (3, 6, and 9 hours after induction, roughly corresponding to stages 13, 16, and 18) with 3 biological replicates. ChIPseq: misexpression of e2f4-GFP +/- multicilin-HGR messenger RNAs in X. laevis animal caps, multicilin induced at mid-stage 11 and harvested at one timepoint (6 hours after induction, roughly corresponding to stage 16), immunoprecipitated with anti-GFP and sequenced; 2 biological replicates. Background was input prior to IP.