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For instance, although the TATA-boxes among Arabidopsis genes were contextually positioned at the correct upstream location, their occurrence in such context was established only in less than 30% of the total validated genes.
Although it has lesser degree of sequence conservation than TATA-box, Y-Patch elements occur in correct upstream context in more than 50% of annotated rice genes, either in combination with or independent of TATA-box.
Another possibility is that 40S subunits terminating at the downstream stop-start sequence can reinitiate, at a reduced frequency, at the correct (upstream) AUG, despite the increased spacing, with the 40S subunit remaining tethered to the mRNA and "snapping-back" to the normal position of reinitiation.
Correct upstream and downstream integration was verified by amplifying across both junctions by colony PCR using primer pairs oLC2802/oLC275 and oLC2804/oLC300, respectively.
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Unfortunately, the recombinant DNA library used in this study contained only ~65% of the genome in the correct orientation upstream of the reporter genes, which will limit the number of different promoters we can recover using this library.
The normal control by KROX20 of cell cycle exit and myelin gene induction, using enforced KROX20 expression, is unchanged in Merlin-null schwannoma cells, but the ability of these cells to induce endogenous markers of differentiation, such as KROX20 and OCT6, in response to a myelination cue is markedly reduced, implying a Merlin-dependent loss of correct signalling upstream of KROX20.
A RT-PCR encompassing exon 1- intron 4 was also performed in all tissues to confirm the correct splicing of their upstream coding region (data not shown).
*: XaPPTase gene from strain PXO99A was mis-annotated (correct start codon is upstream of the one deposited in GenBank).
The mammalian sequences from each ANT gene were aligned using the CLUSTAL software and several sequences were selected according to the correct overlap of their 5' upstream first exon sequences.
The approach assesses the flow locally and provides the flexibility of returning upstream for correcting adjustments.
It turned out that waste management cannot correct mistakes which already happened "upstream" in the product chain.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com