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ATAC-seq of Phytophthora infestans T30-4 mycelium

ABSTRACT: Phytophthora infestans, the causal agent of potato late blight, is a devastating plant disease that leads to Irish potato famine and threatens world-wide food security. Despite the genome of P. infestans has provided fundamental resource for studying the aggressiveness of this pandemic pathogen, the epigenomes remain poorly understood. Here, utilizing liquid chromatography-tandem mass spectrometry (LC-MS/MS), we demonstrate post-translational modifications (PTM) at P. infestans core histone H3. The PTMs not only include these prevalent modifications in eukaryotes, and also some novel marks, such as H3K53me2 and H3K122me3. We focused on the trimethylations of H3K4, H3K9 and H3K27 and H3K36, and profiled P. infestans epigenomes employing Native Chromatin Immunoprecipitation followed by sequencing (N-ChIP-seq). In parallel, we mapped P. infestans chromomatin accessibility by Assay for Transposase-Accessible Chromatin with high-throughput sequencing (ATAC-seq). We found that adaptive genomic compartments display significantly higher levels of H3K9me3 and H3K27me3, and are generally in condense chromatin. Interestingly, we observed that genes encoding virulence factors, such as effectors, are enriched in open chromatin regions that barely have the four histone modifications. With a combination of genomic, epigenomic, transcriptomic strategies, our study illustrates the epigenetic states in P. infestans, which will help to study genomic functions and regulations in this pathogen.

ORGANISM(S): Phytophthora infestans

PROVIDER: GSE199295 | GEO | 2024/03/24

REPOSITORIES: GEO

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RNA-seq of Phytophthora infestans T30-4 two infection stages

Project description:Phytophthora infestans, the causal agent of potato late blight, is a devastating plant disease that leads to Irish potato famine and threatens world-wide food security. Despite the genome of P. infestans has provided fundamental resource for studying the aggressiveness of this pandemic pathogen, the epigenomes remain poorly understood. Here, utilizing liquid chromatography-tandem mass spectrometry (LC-MS/MS), we demonstrate post-translational modifications (PTM) at P. infestans core histone H3. The PTMs not only include these prevalent modifications in eukaryotes, and also some novel marks, such as H3K53me2 and H3K122me3. We focused on the trimethylations of H3K4, H3K9 and H3K27 and H3K36, and profiled P. infestans epigenomes employing Native Chromatin Immunoprecipitation followed by sequencing (N-ChIP-seq). In parallel, we mapped P. infestans chromomatin accessibility by Assay for Transposase-Accessible Chromatin with high-throughput sequencing (ATAC-seq). We found that adaptive genomic compartments display significantly higher levels of H3K9me3 and H3K27me3, and are generally in condense chromatin. Interestingly, we observed that genes encoding virulence factors, such as effectors, are enriched in open chromatin regions that barely have the four histone modifications. With a combination of genomic, epigenomic, transcriptomic strategies, our study illustrates the epigenetic states in P. infestans, which will help to study genomic functions and regulations in this pathogen.

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ChIP-seq of Phytophthora infestans T30-4 mycelium

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Project description:Phytophthora infestans, the causal agent of potato late blight, is a devastating plant disease that was responsible for the Irish potato famine and continues to threaten global food security. While the P. infestans genome is an excellent resource for studying the aggressiveness of this pandemic pathogen, its epigenome remains poorly understood. In this study, utilizing liquid chromatography-tandem mass spectrometry (LC-MS/MS), we identified post-translational modifications (PTMs) at the P. infestans core histone H3. The PTMs include prevalent modifications in eukaryotes, as well as some novel marks, such as H3K53me2 and H3K122me3. We focused on trimethylations of H3K4, H3K9, H3K27, and H3K36, and profiled the P. infestans epigenome using native chromatin immunoprecipitation followed by sequencing (N-ChIP-seq). In parallel, we mapped P. infestans chromatin accessibility using the assay for transposase-accessible chromatin with high-throughput sequencing (ATAC-seq). We found that adaptive genomic compartments display significantly higher levels of H3K9me3 and H3K27me3 and are generally found in condensed chromatin. Interestingly, highly accessible regions with ATAC-seq peaks are also found in this compartment. We observed that genes encoding virulence factors, such as effectors, are enriched in open chromatin regions with few histone modifications. Based on N-ChIP-seq at 3 days post-incubation, we revealed the PTM dynamics in secretome genes from the mycelium to the infection stage. Using a combination of genomic, epigenomic, and transcriptomic strategies, our study illustrates the epigenetic states and changes in P. infestans, helping to elucidate genomic functions and regulation in this pathogen.

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Phytophthora infestans miRNA translocation facilitates infection in potato

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A sulfur-containing volatile emitted by potato-associated bacteria confers protection against late blight through direct anti-oomycete activity

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