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2015 ; 9 Suppl 6
(Suppl 6
): S2
Nephropedia Template TP
gab.com Text
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English Wikipedia
Functional redundancy of transcription factors explains why most binding targets
of a transcription factor are not affected when the transcription factor is
knocked out
#MMPMID26678747
Wu WS
; Lai FJ
BMC Syst Biol
2015[]; 9 Suppl 6
(Suppl 6
): S2
PMID26678747
show ga
BACKGROUND: Biologists are puzzled by the extremely low percentage (3%) of the
binding targets of a yeast transcription factor (TF) affected when the TF is
knocked out, a phenomenon observed by comparing the TF binding dataset and TF
knockout effect dataset. RESULTS: This study gives a plausible biological
explanation of this counterintuitive phenomenon. Our analyses find that TFs with
high functional redundancy show significantly lower percentage than do TFs with
low functional redundancy. This suggests that functional redundancy may lead to
one TF compensating for another, thus masking the TF knockout effect on the
binding targets of the knocked-out TF. In addition, we show that seven classes of
genes (lowly expressed genes, TATA box-less genes, genes containing a
nucleosome-free region immediately upstream of the transcriptional start site
(TSS), genes with low transcriptional plasticity, genes with a low number of
bound TFs, genes with a low number of TFBSs, and genes with a short average
distance of TFBSs to the TSS) are insensitive to the knockout of their
promoter-binding TFs, providing clues for finding other biological explanations
of the surprisingly low percentage of the binding targets of a TF affected when
the TF is knocked out. CONCLUSIONS: This study shows that one property of TFs
(functional redundancy) and seven properties of genes (expression level, TATA
box, nucleosome, transcriptional plasticity, the number of bound TFs, the number
of TFBSs, and the average distance of TFBSs to the TSS) may be useful for
explaining a counterintuitive phenomenon: most binding targets of a yeast
transcription factor are not affected when the transcription factor is knocked
out.