Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Transcription Across the H19/Igf2 Imprinting Control Region Initiates Paternally Methylated Imprinting in Mouse Prospermatogonia

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus

PROVIDER: GSE236417 | GEO | 2023/08/01

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Similar Datasets

Transcription Across the H19/Igf2 Imprinting Control Region Initiates Paternally Methylated Imprinting in Mouse Prospermatogonia (ChIP-Seq)

Project description:The insulator model explains the workings of the H19 and Igf2 domain in the soma, where insulation of the Igf2 promoter from its enhancers occurs by CTCF in the maternally inherited unmethylated chromosome but not the paternally inherited methylated allele. The molecular mechanism that targets paternal methylation imprint establishment to the imprinting control region (ICR) in the male germline is unknown. We tested the function of a prospermatogonia-specific broad low-level transcription in this process using mouse genetics. Paternal imprint establishment was abnormal when transcription was stopped at the entry point to the ICR. The germline epimutation persisted into the paternal allele of the soma, resulting in reduced Igf2 in fetal organs, and reduced fetal growth, consistent with the insulator model and IGF2’s role as fetal growth factor. In summary, broad low-level transcription through the ICR initiates paternal imprint establishment at the H19/Igf2 ICR in the male germ line, with implications for Silver-Russell syndrome. The superseries contains RNAseq and ChIPseq data from 15.5 dpc fetal male germ cells that carry the RNA terminator cassette and also from control wild type mice.

2023-08-02 | GSE236416 | GEO

Transcription Across the H19/Igf2 Imprinting Control Region Initiates Paternally Methylated Imprinting in Mouse Prospermatogonia (RNA-Seq)

Project description:Silver-Russell syndrome(SRS, OMIM 180860) is an imprinting disordermanifesting in fetal and postnatal growth retardation. Loss of methylation (LOM) is detected in the imprinting control region 1 (ICR1) that controls the H19/IGF2 domain, in about 65% of SRS cases. The cause of this epigenetic deficiency is unknown. It may affect the process of imprint establishment --de novo methylation of ICR1 in the male germ line. In the paralogous mouse locus this process involves DNA methyltransferase DNMT3A and H3K36me2 histone methyltransferase NSD1, but the mechanism that targets these enzymes to this ICR is unknown. Based on our genome-wide deep-sequencing data of transcription and DNA methylation, we hypothesized that low-level transcription is required in prospermatogonia for targeting H3K36me2 and de novo methylation to ICR. We truncated this transcript at the entry point to ICR by gene-targeting. In response, the establishment of DNA methylation imprint was incomplete. The sporadic LOM persisted from the male germ line into the paternal allele of the soma, resulting in reduced Igf2, and increased, biallelic H19 RNA in the fetal organs, consistent with the insulator model. Fetus weight was also variably reduced upon paternal transmission of this mutation, consistent with the role of IGF2 as a fetal growth factor. We identify low-level transcription-through as the mechanism that initiates paternal imprint establishment at the H19/Igf2 ICR in the male germ line. The findings predict that RNA-dependent imprint establishment may be affected in human fetuses resulting in sporadic hypomethylation of the ICR1 in SRS.

2023-08-02 | GSE202875 | GEO