Advertisement

Topics

DNA methylation epigenetically silences crossover hot spots and controls chromosomal domains of meiotic recombination in Arabidopsis.

08:00 EDT 15th October 2015 | BioPortfolio

Summary of "DNA methylation epigenetically silences crossover hot spots and controls chromosomal domains of meiotic recombination in Arabidopsis."

During meiosis, homologous chromosomes undergo crossover recombination, which is typically concentrated in narrow hot spots that are controlled by genetic and epigenetic information. Arabidopsis chromosomes are highly DNA methylated in the repetitive centromeres, which are also crossover-suppressed. Here we demonstrate that RNA-directed DNA methylation is sufficient to locally silence Arabidopsis euchromatic crossover hot spots and is associated with increased nucleosome density and H3K9me2. However, loss of CG DNA methylation maintenance in met1 triggers epigenetic crossover remodeling at the chromosome scale, with pericentromeric decreases and euchromatic increases in recombination. We used recombination mutants that alter interfering and noninterfering crossover repair pathways (fancm and zip4) to demonstrate that remodeling primarily involves redistribution of interfering crossovers. Using whole-genome bisulfite sequencing, we show that crossover remodeling is driven by loss of CG methylation within the centromeric regions. Using cytogenetics, we profiled meiotic DNA double-strand break (DSB) foci in met1 and found them unchanged relative to wild type. We propose that met1 chromosome structure is altered, causing centromere-proximal DSBs to be inhibited from maturation into interfering crossovers. These data demonstrate that DNA methylation is sufficient to silence crossover hot spots and plays a key role in establishing domains of meiotic recombination along chromosomes.

Affiliation

Journal Details

This article was published in the following journal.

Name: Genes & development
ISSN: 1549-5477
Pages: 2183-202

Links

DeepDyve research library

PubMed Articles [7225 Associated PubMed Articles listed on BioPortfolio]

Methylation of cation-chloride cotransporters NKCC1 and KCC2 in patients with juvenile myoclonic epilepsy.

The etiology of juvenile myoclonic epilepsy (JME) is still unknown and the process of elaboration of multiple genetic mechanisms is ongoing. The aim of this study was to investigate the potential role...

Meiotic recombination within plant centromeres.

Meiosis is a conserved eukaryotic cell division that increases genetic diversity in sexual populations. During meiosis homologous chromosomes pair and undergo recombination that can result in reciproc...

Relationship between Alzheimer's disease-associated SNPs within the CLU gene, local DNA methylation and episodic verbal memory in healthy and schizophrenia subjects.

Genetic variation may impact on local DNA methylation patterns. Therefore, information about allele-specific DNA methylation (ASM) within disease-related loci has been proposed to be useful for the in...

Recurrent chromosomal and epigenetic alterations in oral squamous cell carcinoma and its putative premalignant condition oral lichen planus.

Head and neck squamous cell carcinoma (HNSCC) affects about 700.000 individuals per year worldwide with oral squamous cell carcinoma (OSCC) as a major subcategory. Despite a comprehensive treatment co...

Association between DNA methylation profile and malignancy in follicular-patterned thyroid neoplasms.

Molecular differentiation between benign (follicular thyroid adenoma, FTA) and malignant (follicular thyroid carcinoma, FTC) thyroid neoplasms is challenging. Here, we explored the genome-wide DNA met...

Clinical Trials [3439 Associated Clinical Trials listed on BioPortfolio]

Quetiapine and the Dopaminergic Epigenetic Control

BACKGROUND: Epigenetic modifications such as DNA-methylation and histone acetylation are known to be involved in the pathophysiology of schizophrenia. Aim of the present study is to inves...

Hydralazine as a Demethylating Agent in Rectal Cancer

Clinically feasible dose of Hydralazine for ~ 3 months, by virtue of its demethylating effect, will: 1. Result in re-expression of epigenetically silenced TSGs in rectal cancer specimen...

An Imaging Trial of the Distribution of Topical Gel in the Human Vagina: Assessment of Bare Spots

This study will assess the distribution of a microbicidal gel in the vagina and confirm the presence of bare spots. MRIs will be done with and without the addition of the MRI contrast Gad...

Exposure in Epigenetic Regulation of Immune Response in Chronic Beryllium Disease (CBD)

This study will provide important results for each aim, while also providing an integrative transcriptional and epigenomic profile of CBD. In Aim 1 the Investigator will define genome-wid...

Comprehensive DNA Methylation Profiling in Crohn's Disease

Previous studies have indicated that abnormal DNA methylation frequently occurs in the mucosa in Crohn's disease. Comprehensive DNA methylation profiling of the inflamed and non-inflamed i...

Medical and Biotech [MESH] Definitions

A multisubunit polycomb protein complex that catalyzes the METHYLATION of chromosomal HISTONE H3. It works in conjunction with POLYCOMB REPRESSIVE COMPLEX 1 to effect EPIGENETIC REPRESSION.

Addition of methyl groups. In histo-chemistry methylation is used to esterify carboxyl groups and remove sulfate groups by treating tissue sections with hot methanol in the presence of hydrochloric acid. (From Stedman, 25th ed)

Zinc finger domains (named for myeloid, Nervy and DEAF-1) that occur in a variety of eukaryotic proteins, including RUNT-RELATED TRANSCRIPTION FACTOR 1 . They are characterized by a cluster of cysteine and histidine residues with conserved spacing that forms the zinc-binding motif and have beta-beta-alpha (see BETA-SHEET and ALPHA-HELIX) topology, similar to LIM domains (see LIM DOMAIN PROTEINS) and RING FINGER DOMAINS. MYND domains function as protein interaction motifs and have affinity for PROLINE-RICH PROTEIN DOMAINS.

A DNA (cytosine-5-)-methyltransferase that contains a central CxxC type zinc finger motif. It binds poly(ADP)-ribose and its expression is regulated by POLY (ADP-RIBOSE) POLYMERASE-1. DNMT1 methylates CpG residues, with a preference for hemimethylated DNA, and associates with DNA replication sites in S PHASE to maintain the methylation pattern in the newly synthesized strand, which is essential for EPIGENETIC PROCESSES. It also associates with CHROMATIN during G2 PHASE and MITOSIS to maintain DNA methylation independently of replication. It is responsible for maintaining methylation patterns established in development; mutations in the DNMT1 gene are associated with HEREDITARY SENSORY NEUROPATHY TYPE 1 class E.

Nucleoproteins, which in contrast to HISTONES, are acid insoluble. They are involved in chromosomal functions; e.g. they bind selectively to DNA, stimulate transcription resulting in tissue-specific RNA synthesis and undergo specific changes in response to various hormones or phytomitogens.

Advertisement
Quick Search
Advertisement
Advertisement

 


DeepDyve research library

Relevant Topics

Bioinformatics
Bioinformatics is the application of computer software and hardware to the management of biological data to create useful information. Computers are used to gather, store, analyze and integrate biological and genetic information which can then be applied...

Epigenetics
The development and maintenance of an organism is orchestrated by a set of chemical reactions that switch parts of the genome off and on at strategic times and locations. Epigenetics is the study of these reactions and the factors that influence them. ...

DNA sequencing
DNA sequencing is the process of determining the precise order of nucleotides within a DNA molecule. During DNA sequencing, the bases of a small fragment of DNA are sequentially identified from signals emitted as each fragment is re-synthesized from a ...


Searches Linking to this Article