RefSeq promoters

Is there any nucleotide bias with the -40 region of RefSeqs?

Taking all hg19 RefSeqs that mapped to assembled chromosomes (36,004) and extracting the nucleotide sequences 40 bp upstream of the RefSeq gene model, I generated a sequence logo.

No obvious TATA box enrichment, which was expected since only 10-20% of genes in eukaryotes have a TATA box (perhaps at -13 to -16?). Note the enrichment of a cytosine at -1.

Then I took the -20 and +20 sequences and generated the same sequence logo plot.

Note the enrichment of purines (adenine and guanine) at the 5' UTR start (position 21).

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