Drosophila melanogaster
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA379553 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR5351980.fastq.gz | Fastqsanger.gz | |||
| SRR5351981.fastq.gz | Fastqsanger.gz | |||
| SRR5351979.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 3 of 3 |
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Project description:Purpose: Piwi family protein Aubergine (Aub) maintains genome integrity in late germ cells of the Drosophila ovary through piRNA-mediated repression of transposon activities. Although it is highly expressed in germline stem cells (GSCs) and early progeny, it remains unclear if it plays any roles in early GSC lineage development. Results: The study reveals a novel function of Aub in GSCs and their progeny, which promotes translation of self-renewal and differentiation factors by directly binding to its target mRNAs and interacting with translational initiation factors.
2017-04-01 | GSE96751 | GEO
Project description:Qin, a novel protein comprising amino-terminal E3 ligase and five carboxy terminal Tudor domains, silences transposons and ensures genome stability in the Drosophila germline by promoting antisene piRNA amplification via Aubergine:Ago3 Ping-Pong and preventing futile Aubergine:Aubergine interactions.
2011-11-18 | GSE30061 | GEO
Project description:Self-renewal of Differentiated Microglia Involves Two Distinct Mechanisms
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Project description:Qin, a novel protein comprising amino-terminal E3 ligase and five carboxy terminal Tudor domains, silences transposons and ensures genome stability in the Drosophila germline by promoting antisene piRNA amplification via Aubergine:Ago3 Ping-Pong and preventing futile Aubergine:Aubergine interactions. Extract total ovary RNAs, and using tiling array to test transposon as well as gene expression in wild-type and qin mutant flies. Three biological replicates are used.
2011-11-18 | E-GEOD-30061 | biostudies-arrayexpress
Project description:Self-renewal of Differentiated Microglia Involves Two Distinct Mechanisms II
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Project description:Differentiated macrophages can self-renew in tissues and expand long-term in culture, but the gene regulatory mechanisms that accomplish self-renewal in the differentiated state have remained unknown. Here we show that in mice, the transcription factors MafB and c-Maf repress a macrophage-specific enhancer repertoire associated with a gene network controlling self-renewal. Single cell analysis revealed that, in vivo, proliferating resident macrophages can access this network by transient down-regulation of Maf transcription factors. The network also controls embryonic stem cell self-renewal but is associated with distinct embryonic stem cell-specific enhancers. This indicates that distinct lineage-specific enhancer platforms regulate a shared network of genes that control self-renewal potential in both stem and mature cells.
2016-02-03 | GSE75722 | GEO
Project description:The niche controls stem cell self-renewal and progenitor differentiation for maintaining adult tissue homeostasis in various organisms. However, it remains unclear if the niche is compartmentalized to control stem cell self-renewal and stepwise progeny differentiation. In the Drosophila ovary, inner germarial sheath (IGS) cells form a niche for controlling germline stem cell (GSC) progeny differentiation. In this study, we have identified four IGS subpopulations, which form linearly arranged niche compartments for controlling GSC maintenance and multi-step progeny differentiation. Single-cell analysis of the adult ovary has identified four IGS subpopulations (IGS1-4), which identities and cellular locations have been further confirmed by fluorescent in situ hybridization. IGS1 and IGS2 physically interact with GSCs and mitotic cysts to control GSC maintenance and cyst formation, respectively, whereas IGS3 and IGS4 physically interact with 16-cell cysts to regulate meiosis and oocyte development. Finally, one follicle cell progenitor population has also been transcriptionally defined for facilitating future studies on follicle stem cell regulation. Therefore, this study has structurally revealed that the niche is organized into multiple compartments for orchestrating stepwise adult stem cell development, and has also provided useful resources and tools for further functional characterization of the niche in the future.
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Project description:PIWI proteins and their associated small noncoding piRNAs, which guide PIWI to target RNAs by base-pairing, are among the maternal components deposited into the germline of the early embryo in Drosophila. Piwi has been extensively studied in the adult ovary and testis, where it is required for transposon suppression, germline stem cell self-renewal, and fertility. Consequently, loss of Piwi in the adult ovary using piwi-null alleles or knockdown from early oogenesis results in complete sterility, limiting investigation into possible embryonic functions of maternal Piwi. In this study, we show that the maternal Piwi protein persists in the embryonic germline through gonad coalescence, suggesting that maternal Piwi can regulate germline development beyond early embryogenesis. Using a maternal knockdown strategy, we find that maternal Piwi is required for the fertility and normal gonad morphology of female, but not male, progeny. Following maternal Piwi knockdown, transposons were mildly derepressed in the early embryo but were fully repressed in the adult ovaries of progeny. Furthermore, the maternal piRNA pool is diminished, reducing the capacity of the PIWI/piRNA complex to target some zygotic genes during embryogenesis. Examination of embryonic germ cell proliferation and gene expression in the adult ovary showed that the germline of female progeny is partially masculinized upon maternal Piwi knockdown . This reveals a novel role for maternal Piwi in the germline development of female progeny and suggests that the PIWI/piRNA pathway is involved in germline sex determination in Drosophila.
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Project description:Spermatogonial stem cells (SSCs) undergo self-renewal division to sustain spermatogenesis. Although it is possible to derive germline stem (GS) cell cultures from most of the mouse strains by supplementing GDNF and FGF2, SSCs from a 129 background do not proliferate under the same culture conditions, which suggested that they have distinct self-renewal requirements. We modified previous culture conditions and established long-term culture of SSCs of 129 mice. 129 GS cells reinitiated spermatogenesis and produced offspring following transplantation into the seminiferous tubules of infertile mouse recipients. This dataset show the differences of gene expressions of GS cells between C57BL/6 and 129 mice, which have important implications in understanding requirements of self-renewal mechanisms. In this dataset, we include the expression data obtained from cultured spermatogonia (GS cells) derived from C57BL/6, and 129 mice. Each group contains 2 biological replicates.
2024-06-17 | GSE236119 | GEO
Project description:Increasing evidence links metabolic activity and cell growth to decline in hematopoietic stem cell (HSC) function during aging. The Lin28b/Hmga2 pathway controls tissue development and in the hematopoietic system the postnatal downregulation of this pathway causes a decrease in self renewal of adult HSCs compared to fetal HSCs. Igf2bp2 is an RNA binding protein and a mediator of the Lin28b/Hmga2 pathway, which regulates metabolism and growth signaling by influencing RNA stability and translation of its target genes. It is currently unknown whether Lin28/Hmga2/Igf2bp2 signaling impacts on aging-associated impairments in HSC function and hematopoiesis. Here, we analyzed homozygous Igf2bp2 germline knockout mice and wildtype control animals to address this question. The study shows that Igf2bp2 deletion rescues aging phenotypes of the hematopoietic system, such as the expansion of HSC numbers in bone marrow and the biased increase of myeloid cells in peripheral blood. This rescue of hematopoietic aging coincides with reduced mitochondrial metabolism and glycolysis in Igf2bp2-/- HSCs compared to Igf2bp2+/+ HSCs. Conversely, Igf2bp2 overexpression activates protein synthesis pathways in HSCs and leads to a rapid loss of self renewal by enhancing myeloid skewed differentiation in an mTOR/PI3K-dependent manner. Together, these results show that Igf2bp2 regulates energy metabolism and growth signaling in HSCs and that the activity of this pathways influences self renewal, differentiation, and aging of HSCs.
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