English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

tRNA and some other non-coding RNA genes are transcribed by RNA polymerase III (pol III), due to the presence of intragenic promoter, consisting of boxes A and B spaced by 30-40 bp. Such pol III promoters, called type 2, are also intrinsic to Short Interspersed Elements (SINEs). The contribution of 5'-flanking sequences to the transcription efficiency of genes containing type 2 promoters is still studied insufficiently. Here, we studied this issue, focusing on the genes of two small non-coding RNAs (4.5SH and 4.5SI), as well as B1 and B2 SINEs from the mouse genome. We found that the regions from position -31 to -24 may significantly influence the transcription of genes and SINEs. We studied the influence of nucleotide substitutions in these sites, representing TATA-like boxes, on transcription of 4.5SH and 4.5SI RNA genes. As a rule, the substitutions of A and T to G or C reduced the transcription level, although the replacement of C with A also lowered it. In 4.5SH gene, five distal nucleotides of -31/-24 box (TTCAAGTA) appeared to be the most important, while in the box -31/-24 of 4.5SI gene (CTACATGA), all nucleotides, except for the first one, contributed significantly to the transcription efficiency. Random sequences occurring at positions -31/-24 upstream of SINE copies integrated into genome, promoted their transcription with different efficacy. In the 5'-flanking sequences of 4.5SH and 4.5SI RNA genes, the recognition sites of CREB, C/EBP, and Sp1 factors were found, and their deletion decreased the transcription.

TATA-Like Boxes in RNA Polymerase III Promoters: Requirements for Nucleotide Sequences