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Chemically-induced epimutagenesis allows bypassing reproductive barriers in hybrid seeds [BiSulfite-seq]

ABSTRACT: Chemically-induced epimutagenesis allows bypassing reproductive barriers in hybrid seeds [BiSulfite-seq]

PROVIDER: PRJNA744574 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR15067126.fastq.gz	Fastqsanger.gz
	SRR15067127.fastq.gz	Fastqsanger.gz
	SRR15067128.fastq.gz	Fastqsanger.gz
	SRR15067129.fastq.gz	Fastqsanger.gz
	SRR15067130.fastq.gz	Fastqsanger.gz

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Chemically-induced epimutagenesis allows bypassing reproductive barriers in hybrid seeds

Project description:Chemically-induced epimutagenesis allows bypassing reproductive barriers in hybrid seeds

| PRJNA744571 | ENA

Chemically-induced epimutagenesis allows bypassing reproductive barriers in hybrid seeds [RNA-seq]

Project description:Chemically-induced epimutagenesis allows bypassing reproductive barriers in hybrid seeds [RNA-seq]

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Chemically-induced epimutagenesis allows bypassing reproductive barriers in hybrid seeds [BiSulfite-seq]

Project description:The "triploid block" prevents interploidy hybridizations in flowering plants, and is characterized by failure in endosperm development and function, arrest in embryogenesis, and seed collapse. Many genetic components of triploid seed lethality have been successfully identified in the model plant Arabidopsis thaliana, most notably the paternally expressed imprinted genes (PEGs) that are up-regulated in the tetraploid endosperm with paternal excess. Previous studies have shown that the paternal epigenome is a key determinant of the triploid block response, as the loss of DNA methylation in diploid pollen suppresses the triploid block almost completely. Here, we demonstrate that triploid seed abortion is bypassed in plants treated with the DNA methyltransferase inhibitor 5-Azacytidine during seed germination and early plant growth. We have identified strong suppressor lines showing transgenerational inheritance of hypomethylation in CG context, as well as normalized expression of PEGs. Importantly, differentially methylated loci segregate in the progeny of "epimutagenized" plants, which may allow the identification of epialleles involved in the triploid block response in future studies. Finally, we demonstrate that chemically-induced epimutagenesis allows bypassing interploidy hybridizations in Arabidopsis and interspecific hybridization barriers in crosses between Capsella species, thus potentially emerging as a novel strategy for seed-based breeding of triploids and interspecific hybrids with agronomical interest.

2021-11-23 | GSE179702 | GEO

Chemically-induced epimutagenesis allows bypassing reproductive barriers in hybrid seeds [RNA-seq]

2021-11-23 | GSE179697 | GEO

Chemically-induced epimutagenesis allows bypassing reproductive barriers in hybrid seeds

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

2021-11-23 | GSE179704 | GEO

Bypassing reproductive barriers in hybrid seeds using chemically induced epimutagenesis.

Project description:The triploid block, which prevents interploidy hybridizations in flowering plants, is characterized by a failure in endosperm development, arrest in embryogenesis, and seed collapse. Many genetic components of triploid seed lethality have been successfully identified in the model plant Arabidopsis thaliana, most notably the paternally expressed genes (PEGs), which are upregulated in tetraploid endosperm with paternal excess. Previous studies have shown that the paternal epigenome is a key determinant of the triploid block response, as the loss of DNA methylation in diploid pollen suppresses the triploid block almost completely. Here, we demonstrate that triploid seed collapse is bypassed in Arabidopsis plants treated with the DNA methyltransferase inhibitor 5-Azacytidine during seed germination and early growth. We identified strong suppressor lines showing stable transgenerational inheritance of hypomethylation in the CG context, as well as normalized expression of PEGs in triploid seeds. Importantly, differentially methylated loci segregate in the progeny of "epimutagenized" plants, which may allow epialleles involved in the triploid block response to be identified in future studies. Finally, we demonstrate that chemically induced epimutagenesis facilitates hybridization between different Capsella species, thus potentially emerging as a strategy for producing triploids and interspecific hybrids with high agronomic interest.

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Altering translation allows E. coli to overcome chemically stabilized G-quadruplexes

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TET-mediated epimutagenesis of the Arabidopsis thaliana methylome

Project description:DNA methylation in the promoters of plant genes sometimes leads to transcriptional repression, and the wholesale removal of DNA methylation as seen in methyltransferase mutants results in drastic changes in gene expression and severe developmental defects. However, many cases of naturally-occurring DNA methylation variations have been reported, whereby the altered expression of differentially methylated genes is responsible for agronomically important traits. The ability to manipulate plant methylomes to generate populations of epigenetically distinct individuals could provide invaluable resources for breeding and research purposes. Here we describe “epimutagenesis”, a novel method to rapidly generate variation of DNA methylation through random demethylation of the Arabidopsis thaliana genome. This method involves the expression of a human Ten-eleven translocation (TET) enzyme, and results in widespread hypomethylation that can be inherited to subsequent generations, mimicking mutants in the maintenance DNA methyltransferase met1. Application of TET-mediated epimutagenesis to agriculturally significant plants may result in differential expression of alleles normally silenced by DNA methylation, uncovering previously hidden phenotypic variations.

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