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Fine chromatin-driven mechanism of transcription interference by antisense noncoding transcription

ABSTRACT: Eukaryotic genomes are almost entirely scanned by RNA polymerase II (RNAPII). Consequently, the transcription of long noncoding RNAs (lncRNAs) often overlaps with coding gene promoters triggering potential gene repression through a poorly characterized mechanism of transcription interference. In this study, we propose a global model of chromatin-based transcription interference in Saccharomyces cerevisiae (S. cerevisiae). By using a noncoding transcription inducible strain, we analyzed the relationship between antisense elongation and coding sense repression, nucleosome occupancy and transcription-associated histone modifications using near-base pair resolution techniques. We show that antisense noncoding transcription leads to -1/+1 nucleosome deacetylation via H3K36 trimethylation (H3K36me3). This results in the loss of -1/+1 nucleosome interaction with the RSC chromatin remodeler and subsequent sliding into the Nucleosome-Depleted Region (NDR) hindering Pre-Initiation Complex (PIC) binding. Finally, we extend our model by showing that natural antisense noncoding transcription significantly regulates around 20% of S. cerevisiae genes through this chromatin-based transcription interference mechanism.

ORGANISM(S): Saccharomyces cerevisiae

PROVIDER: GSE130946 | GEO | 2019/05/10

REPOSITORIES: GEO

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