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Extensive N4 Cytosine Methylation is Essential for Marchantia Transcriptional Programming and Sperm Function [2]

ABSTRACT: Global N4 cytosine methylation catalyzed by a novel DNA methyltransferase is important for transcriptional programming, sperm mobility, and post-fertilization in Marchantia

ORGANISM(S): Marchantia polymorpha subsp. ruderalis

PROVIDER: GSE254153 | GEO | 2025/04/09

REPOSITORIES: GEO

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Extensive N4 cytosine methylation of Marchantia genes is essential for sperm function [1]

Project description:Sperm mobility in Marchantia requires global N4 cytosine methylation catalysed by two novel DNA methyltransferases.

2025-04-09 | GSE163200 | GEO

Extensive N4 Cytosine Methylation is Essential for Marchantia Transcriptional Programming and Sperm Function

Project description:Extensive N4 Cytosine Methylation is Essential for Marchantia Transcriptional Programming and Sperm Function

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Extensive N4 Cytosine Methylation is Essential for Marchantia Transcriptional Programming and Sperm Function

Project description:This SuperSeries is composed of the SubSeries listed below.

2025-04-09 | GSE254154 | GEO

Extensive N4 cytosine methylation of Marchantia genes is essential for sperm function [1]

Project description:Extensive N4 cytosine methylation of Marchantia genes is essential for sperm function [1]

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EVOREPRO: RNA-seq of Marchantia polymorpha Takaragaike sperm cells

Project description:Marchantia sperm RNA-seq data

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5-methyl cytosine profile of the wild type and Mpmet mutant in Marchantia polymorpha

Project description:To understand a role of MpMET in maintenance of cytpsine methylation and transposon silencing, we obtained a genome wide profile of 5-methylated cytosine from the Mpmet mutant of a model liverwort, Marchantia polymorpha.

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H2A ubiquitination is essential for Polycomb Repressive Complex 1-mediated gene regulation in Marchantia polymorpha

Project description:Polycomb repressive complex 1 (PRC1) and PRC2 are chromatin regulators maintaining transcriptional repression by depositing H2A mono-ubiquitination (H2Aub) or H3 lysine 27 tri-methylation (H3K27me3), respectively. While PRC1 is known to be required for transcriptional repression, the contribution of H2Aub in the Polycomb repressive system remains unclear in plants. Here, we directly test the requirement of H2Aub for gene repression in Marchantia polymorpha by generating point mutants in H2A that fail to be ubiquitinated by PRC1. These mutants show reduced H3K27me3 levels on the same target sites as mutants in PRC1 subunits MpBMI1 and the homolog MpBMI1L, revealing that PRC1-catalyzed H2Aub is essential for Polycomb system function. Furthermore, we demonstrate that H2Aub contributes to the PRC1-mediated silencing of genes and transposable elements. Together, our data provide evidence that H2Aub plays indispensable roles in the PRC1-initiated repressive system in Marchantia.

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High-light stress RNA-seq Marchantia polymorpha

Project description:In order to elucidate the role of the single Marchantia B-GATA ortholog in response to high light intensities, a transcriptomic analysis of Marchantia polymorpha BoGa, Mpb-gata1 mutants and MpB-GATA1ox under high-ligh stress conditions was performed.

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Base-resolution detection of N4-methylcytosine in genomic DNA using 4mC-TAB-seq

Project description:N4-methylcytosine is a major DNA modification integral to restriction-modification (R-M) systems in bacterial genomes. Here we describe 4mC-Tet-Assisted Bisulfite-sequencing (4mC-TAB-seq), a method that accurately and rapidly reveals the genome-wide locations of N4-methylcytosines at single-base resolution. By coupling Tet-mediated oxidation with a modified sodium bisulfite conversion reaction, unmodified cytosines and 5-methylcytosines are read out as thymines, whereas N4-methylcytosines are read out as cytosines revealing their positions throughout the genome. 4mC-TAB-seq

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DNA is Methylated on N4-Cytosine in Eukaryotes

Project description:DNA methylation is a key mechanism for regulation of DNA repair, DNA replication, and gene expression. In bacteria, DNA is modified by methylation on C5-cytosine (5mC), N6-adenine (6mA) and N4-cytosine (4mC). Metazoans were thought to only use 5mC to regulate gene expression until the recent discovery of N6-adenine methylation in DNA of diverse metazoan species, including mammals. Here we show by dot blot, immunoprecipitation with 4mC-specific antibodies, and ultra-high performance liquid chromatography coupled with triple-quadrupole mass spectrometry that 4mC also occurs in most eukaryotes. We further characterize 4mC sites on a near genome-wide scale by single molecule real time (SMRT) sequencing in the nematode C. elegans. In C. elegans, 4mC is found in all chromosomes but is relatively sparse on the X chromosome. 4mC is relatively enriched on introns, depleted on exons, and co-localizes with 6mA. In human cells, 4mC is anti-correlated with 5mC. Moreover, 4mC modifications are associated with increased gene expression. Transfection of human cells with a 4mC-modified luciferase reporter plasmid increases luciferase expression as compared to the unmethylated plasmid. These data suggest that 4mC promotes gene transcription, playing an opposing role to 5mC, which generally represses transcription. Thus 4mC modification of DNA is a previously unrecognized mechanism of gene regulation in eukaryotes, providing evidence for a complex epigenetic DNA code.

2018-09-01 | GSE86993 | GEO

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