Project description:Gene expression microarray experiments to determine the existence of intragenic (cryptic) transcripts in K36A, K56R and K36AK56R mutant yeast strain compared to wildtype.
Project description:Gene expression microarray experiments to determine the existence of intragenic (cryptic) transcripts in K36A, K56R and K36AK56R mutant yeast strain compared to wildtype.
Project description:Transcription can be quite disruptive for chromatin so cells have evolved mechanisms to preserve chromatin integrity during transcription, hence preventing the emergence of cryptic transcript from spurious promoter sequences. How these transcripts are regulated and processed by cells remains poorly characterized. Notably, very little is known about the termination of cryptic transcription. Here we used RNA-Seq to identify and characterize cryptic transcripts in Spt6 mutant cells (spt6-1004) in Saccharomyces cerevisiae. We found polyadenylated cryptic transcripts running both sense and anti-sense relative to genes in this mutant. Cryptic promoters were enriched for TATA boxes, suggesting that the underlying DNA sequence defines the location of cryptic promoters. While intragenic sense cryptic transcripts terminate at the terminator of the genes that host them, we found that anti-sense cryptic transcripts preferentially terminate at the 3’-end of upstream genes. These findings led us to demonstrate that most terminators in yeast are bidirectional, leading to termination and polyadenylation of transcripts coming from either direction. We propose that S. cerevisiae has evolved this mechanism in order to prevent spurious transcription from invading neighbouring genes, a feature particularly critical for organisms with small compact genomes.
Project description:Gene expression microarray experiments to determine the existence of intragenic (cryptic) transcripts in K36A, K56R and K36AK56R mutant yeast strain compared to wildtype. Two color experiment. Mutant/WT. Biological replicates=3. Hybridisation of same samples to strand-specific gene expression arrays.
Project description:Gene expression microarray experiments to determine the existence of intragenic (cryptic) transcripts in K36A, K56R and K36AK56R mutant yeast strain compared to wildtype. Two color experiment. Mutant/WT. Biological replicates=3. Hybridisation of same samples to strand-specific gene expression arrays.
