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2015 ; 40
(5
): 257-64
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Integrator: surprisingly diverse functions in gene expression
#MMPMID25882383
Baillat D
; Wagner EJ
Trends Biochem Sci
2015[May]; 40
(5
): 257-64
PMID25882383
show ga
The discovery of the metazoan-specific Integrator (INT) complex represented a
breakthrough in our understanding of noncoding U-rich small nuclear RNA (UsnRNA)
maturation and has triggered a reevaluation of their biosynthesis mechanism. In
the decade since, significant progress has been made in understanding the details
of its recruitment, specificity, and assembly. While some discrepancies remain on
how it interacts with the C-terminal domain (CTD) of the RNA polymerase II
(RNAPII) and the details of its recruitment to UsnRNA genes, preliminary models
have emerged. Recent provocative studies now implicate INT in the regulation of
protein-coding gene transcription initiation and RNAPII pause-release, thereby
broadening the scope of INT functions in gene expression regulation. We discuss
the implications of these findings while putting them into the context of what is
understood about INT function at UsnRNA genes.