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In S. cerevisiae, alternative transcription start sites generate long alternative mRNA TLs with substantially lower translation efficiencies. [21] Counterintuitively, upstream transcriptional induction of these genes actually silences their expression during meiosis by blocking translation.
Use of multiple promoters is properly described as a transcriptional regulation mechanism rather than alternative splicing; by starting transcription at different points, transcripts with different 5'-most exons can be generated. At the other end, multiple polyadenylation sites provide different 3' end points for the transcript.
Pten J1 is identical in sequence to the conventional Pten isoform except for a difference in TSS and a small shift in the CDS. Pten J2 has a truncated CDS, an alternative transcription start site and a longer 3’ UTR compared to the conventional Pten isoform expressed within neurons. The truncated CDS encodes a protein that lacks a phosphate ...
There are multiple alternative splicing modes: exon skipping (most common splicing mode in humans and higher eukaryotes), mutually exclusive exons, alternative donor or acceptor sites, intron retention (most common splicing mode in plants, fungi, and protozoa), alternative transcription start site (promoter), and alternative polyadenylation. [118]
The 5′ UTR begins at the transcription start site and ends one nucleotide (nt) before the initiation sequence (usually AUG) of the coding region. In prokaryotes, the length of the 5′ UTR tends to be 3–10 nucleotides long, while in eukaryotes it tends to be anywhere from 100 to several thousand nucleotides long. [3]
RNA polymerase, assisted by one or more general transcription factors, then selects a transcription start site in the transcription bubble, binds to an initiating NTP and an extending NTP (or a short RNA primer and an extending NTP) complementary to the transcription start site sequence, and catalyzes bond formation to yield an initial RNA ...
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