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2016 ; 2
(6
): 391-401
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Insights into the Mechanisms of Basal Coordination of Transcription Using a
Genome-Reduced Bacterium
#MMPMID27237741
Junier I
; Unal EB
; Yus E
; Lloréns-Rico V
; Serrano L
Cell Syst
2016[Jun]; 2
(6
): 391-401
PMID27237741
show ga
Coordination of transcription in bacteria occurs at supra-operonic scales, but
the extent, specificity, and mechanisms of such regulation are poorly understood.
Here, we tackle this problem by profiling the transcriptome of the model organism
Mycoplasma pneumoniae across 115 growth conditions. We identify three
qualitatively different levels of co-expression corresponding to distinct
relative orientations and intergenic properties of adjacent genes. We reveal that
the degree of co-expression between co-directional adjacent operons, and more
generally between genes, is tightly related to their capacity to be transcribed
en bloc into the same mRNA. We further show that this genome-wide pervasive
transcription of adjacent genes and operons is specifically repressed by DNA
regions preferentially bound by RNA polymerases, by intrinsic terminators, and
by large intergenic distances. Taken together, our findings suggest that the
basal coordination of transcription is mediated by the physical entities and
mechanical properties of the transcription process itself, and that operon-like
behaviors may strongly vary from condition to condition.