Comparative Analysis of the 5’ Flanking Region in iArabidopsis/iand iO. sative/iRP Genes Revealed Conserved and Divergent Regulating Mechanisms

摘要

Ribosome is one of the most abundant organelles in all living cells and plays a crucial role in cell growth. Synthesis of ribosomal components is tightly related with the change of growth conditions. We have comparatively analyzed the 5’ flanking region of ribosomal protein (RP) genes in Arabidopsis and O. sativa. In both Arabidopsis and O. sativa, there are two putative transcriptional factor binding motifs (telo box and site II elements) overrepresented in the proximal promoter region with a strong positional bias in most of the RP genes, which suggests the conserved mechanism of transcription-level control in RP genes of these two organisms. Tri-nucleotide repeats motif CTT and CCG were also common in 5’ flanking region of RP genes in Arabidopsis and O. sativa. However, we only found CCG repeat motif was enriched in O. sativa RP genes and most of them were clustered in the 5’ UTR region. This finding reveals molecular mechanism for divergent regulation of RP genes in Arabidopsis and O. sativa, and gives the possible clue to the mechanism of controlling O. sativa RP genes expression at the translation level.