DOI: 10.1101/487496Dec 4, 2018Paper

Intertwined canonical and non-canonical initiation in dual promoters are pervasive and differentially regulate Polymerase II transcription

BioRxiv : the Preprint Server for Biology
Chirag NepalFerenc Mueller

Abstract

The diversity and complexity of transcription start site (TSS) selection reflects variation of preinitiation complexes, divergent function of promoter-binding proteins and underlies not only transcriptional dynamics but may also impact on post-transcriptional fates of RNAs. The majority of metazoan genes are transcribed by RNA polymerase II from a canonical initiation motif having an YR dinucleotide at their TSSs. In contrast, translation machinery-associated genes carry promoters with polypyrimidine initiator (known as 5′-TOP or TCT) with cytosine replacing the R nucleotide. The functional significance of start site choice in promoter architectures is little understood. To get insight into the developmental regulation of start site selection we profiled 5′ ends of transcripts during zebrafish embryogenesis. We uncovered a novel class of dual-initiation (DI) promoters utilized by thousands of genes. In DI promoters non-canonical YC-initiation representing 5′-TOP/TCT initiators is intertwined with canonical YR-initiation. During maternal to zygotic transition, the two initiation types are divergently used in hundreds of DI promoters, demonstrating that the two initiation systems are distinctly regulated. We show via the example ...Continue Reading

Related Concepts

Base Sequence
Cytosine
Embryonic Development
Fruit
Genes
RNA
DNA-Directed RNA Polymerase
Transcription, Genetic
Zebrafish
CD48 protein, human

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