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MiRNA expression in C. elegans fem-2(b245ts) and fem-3(q20ts) mutants

ABSTRACT: We compared animals that produce oocytes but no sperm fem-2(b245ts) to animals that produce sperm but no oocytes fem-3(q20ts). Using miRNA microarrays and we found that the mir-35-41 cluster genes were expressed to much greater extent in oogenesis than in spermatogenesis; furthermore, these miRNAs were the only C. elegans miRNAs that showed such differential germline expression.

ORGANISM(S): Caenorhabditis elegans

PROVIDER: GSE19557 | GEO | 2010/01/07

SECONDARY ACCESSION(S): PRJNA122399

REPOSITORIES: GEO

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miRNA expression in C. elegans fem-2(b245ts) and fem-3(q20ts) mutants

Project description:We compared animals that produce oocytes but no sperm fem-2(b245ts) to animals that produce sperm but no oocytes fem-3(q20ts). Using miRNA microarrays and we found that the mir-35-41 cluster genes were expressed to much greater extent in oogenesis than in spermatogenesis; furthermore, these miRNAs were the only C. elegans miRNAs that showed such differential germline expression. Total RNA was isolated from staged one day old adult populations. The data were obtained from two biological replicates. Each oligonucleotide was printed four times. Data were scaled based on total array intensities (sum of the normalized spot intensities), and data for each sample and each gene were averaged.

2010-05-16 | E-GEOD-19557 | biostudies-arrayexpress

oocytes vs sperm

Project description:fem-1(lf) oocytes only vs fem-3(gf) sperm only Keywords: other

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Distribution of histone modifications across the genome in C. elegans sperm vs. oocytes vs. early embryos

Project description:Here we report that the Caenorhabditis elegans sperm genome is packaged in nucleosomes and carries a histone-based epigenetic memory of genes with spermatogenesis-restricted expression and surprisingly genes with oogenesis-enriched expression as well. In sperm, spermatogenesis genes are uniquely marked with both active and repressive marks, which may reflect a sperm-specific chromatin signature.

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RNA-seq transcriptome profiling of 1) C. elegans male germlines vs. oogenic germlines, and 2) male germlines, sperm, and F1 offspring germlines when offspring inherited sperm chromatin lacking H3K27me3.

Project description:Paternal contributions to epigenetic inheritance are not well understood. We report that in C. elegans sperm, the genome is packaged in nucleosomes and carries a histone-based epigenetic memory of gene expressions during spermatogenesis. In mature sperm, genes with spermatogenesis-specific expression are marked with both active and represseive histone modifications and genes with oogenesis-enriched expression are marked with active histone modifications. We showed that genes with oogenesis-enriched expression are in fact transcribed in spermatogenic germlines. We tested if sperm chromatin marking is necessary for germ cell development in offspring that inherit both sperm and oocyte chromosomes, using male parents that either can or cannot generate H3K27me3. Males homozygous for a mutation in mes-3, which encodes a member of the worm PRC2 complex, were mated with feminized mes-3/+ heterozygous worms to produce offspring that inherited sperm chromosomes lacking H3K27me3. We call these offspring M+P- or MpPm (Maternal chromosomes are + or plus for H3K27me3, Paternal chromosomes are - or minus for H3K27me3). Most of the resulting mes-3 homozygous M+P- offspring developed into sterile adults in this sensitized genetic background. In contrast, genetically identical control offspring that received appropriate H3K27me3-marked sperm chromosomes (M+P+ or MpPp) displayed low sterility. We compared genes mis-regulated in mes-3 male germlines versus control him-8 male germlines, mature sperm from those germlines, and germlines of mes-3 mutant F1 offspring that inherited sperm chromatin lacking H3K27me3 (M+P-) versus inherited sperm chromatin with H3K27me3 (M+P+), based on RNA-seq.

2018-07-23 | GSE115708 | GEO

Reproductive aging: fem-1 day 3 oocyte vs fem-1 day 8 oocyte

Project description:To find genes in C. elegans oocytes associated with reproductive aging. Five replicates comparing RNA from oocyte samples collected from day 3 fem-1(hc17) animals with RNA from oocyte samples collected from day 8 fem-1(hc17) animals. Three out of five are dye-flipped.

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A Restricted Role for Sperm-borne MicroRNAs in Mammalian Fertilization

Project description:Prototypical micro RNAs (miRNAs) are 21~25-base-pair RNAs that regulate differentiation, carcinogenesis and pluripotency by eliminating mRNAs or blocking their translation, processes collectively termed RNA interference (RNAi). RNAi mediated by miRNAs regulates early development in zebrafish, and mouse embryos lacking the miRNA precursor processor, Dicer, are inviable. However, the role of miRNAs during mammalian fertilization is unknown. We here show using microarrays that miRNAs are present in mouse sperm structures that enter the oocyte at fertilization. Sperm contained a broad profile of miRNAs and a subset of potential mRNA targets were expressed in fertilizable, metaphase II (mII) oocytes. Oocytes contained transcripts for the RNAinduced silencing complex (RISC) catalytic subunit, EIF2C3 (formerly AGO3). However, levels of sperm-borne miRNA (measured by quantitative PCR) were apparently low relative to those of unfertilized, mII oocytes, and fertilization did not alter the part of the mII oocyte miRNA landscape that included the most abundant sperm-borne miRNAs. Coinjection of mII oocytes with sperm heads plus anti-miRNAs - to suppress miRNA function - did not perturb pronuclear activation or preimplantation development. Contrastingly, we provide evidence that nuclear transfer by microinjection alters the miRNA profile of enucleated oocytes. These data argue that sperm-borne prototypical miRNAs play a limited role, if any, in mammalian fertilization or early preimplantation development. Keywords: miRNA profiling Seven samples were analyzed for the study.

2010-06-10 | E-GEOD-4011 | biostudies-arrayexpress

Reproductive aging: sma-2;fem-1 day 8 oocyte vs fem-1 day 8 oocyte

Project description:To find genes downstream of the TGF-beta Sma/Mab pathway in C. elegans oocytes associated with reproductive aging. Eight replicates comparing RNA from oocyte samples collected from day 8 sma-2(e502);fem-1(hc17) animals with RNA from oocyte samples collected from day 8 fem-1(hc17) animals. Five out of eight are dye-flipped.

2010-09-01 | E-GEOD-23446 | biostudies-arrayexpress

A Restricted Role for Sperm-borne MicroRNAs in Mammalian Fertilization

2006-09-06 | GSE4011 | GEO

Two-cell developmental block is due to the lack of cytoplasmic lattices in mouse antral oocytes

Project description:Mammalian oogenesis is a complex mechanism entailing the maturation of primordial follicles into preovulatory follicles followed by the release of antral oocytes. In the ovary, the antral compartment consists of two populations of oocytes whose main difference regards the ability to resume meiosis and to develop, after the egg-sperm fusion, until the blastocyst stage. Still inexplicably, the antral oocytes distinguishable as Surrounded Nucleolus (SN; 70% of the antral oocytes population) are able to develop to the blastocyst stage, while those showing a Not Surrounded Nucleolus (NSN) arrest at the two-cell stage.

2013-02-04 | GSE34671 | GEO

Maternal MicroRNAs are Essential for Mouse Zygotic Development

Project description:MicroRNAs (miRNAs) have been shown to have important functions in a variety of cellular processes. Here we report on miRNA expression and their dynamic regulation during mouse oogenesis and early embryos. We show that following specific deletion of Dicer from growing oocytes, the mutant oocytes cease development and were unable to progress through the first cell division. While the mutant mature oocytes seemed morphologically normal, they had disorganized spindle. Using detailed single cell cDNA microarray analysis of normal versus mutant oocytes, we found that a large proportion of maternal genes, including C-mos, are under the control of miRNAs. This study provides strong evidence that maternal miRNAs are essential for the earliest stages of mouse embryonic development. mRNA expression was compared with miRNA expression in dicer knockout and wild-type mouse mature oocyte.

2010-06-11 | E-GEOD-6806 | biostudies-arrayexpress

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