Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Opa is a late-acting, pioneer factor that coordinates with Zelda to broadly regulate gene expression in early embryos (ChIP-seq, ATAC-seq)

ABSTRACT: Pioneer factors such as Zelda initiate zygotic transcription within Drosophila early embryos, but whether other factors also support this dynamic patterning process is unclear. Odd-paired (Opa) is a zinc-finger transcription factor expressed during cellularization, shown to act as timing factor to control pair-rule to segmental patterning transition along the anterior-posterior (AP) axis. We found Opa regulates expression through an enhancer active along the dorso-ventral axis (sog_Distal), specifically, to support its late embryonic expression. Opa chromatin immunoprecipitation identified occupancy at this enhancer sequence as well widespread binding throughout the genome, comparable to Zelda. Furthermore, chromatin assays (ATAC-seq) demonstrate that Opa, like Zelda, influences accessibility and has both common as well as distinct target sequences. opa mutants also exhibit DV and AP patterning changes suggesting Opa acts broadly. This study suggests Opa is a late-acting, pioneer factor whose action follows Zelda to herald in a second wave of zygotic gene expression. NIH Grants R35GM118146 and R03HD097535 to A.S.

ORGANISM(S): Drosophila melanogaster

PROVIDER: GSE140722 | GEO | 2020/08/02

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Opa is a late-acting, pioneer factor that coordinates with Zelda to broadly regulate gene expression in early embryos (ATAC-seq, RNA-seq)

Project description:Pioneer factors such as Zelda (Zld) help initiate zygotic transcription in Drosophila early embryos, but whether other factors support this dynamic process is unclear. Odd-paired (Opa), a zinc-finger transcription factor expressed at cellularization, controls the transition of genes from pair-rule to segmental patterns along the anterior-posterior axis. Finding that Opa also regulates expression through enhancer sog_Distal along the dorso-ventral axis, we hypothesized Opa’s role is more general. Chromatin-immunoprecipitation (ChIP-seq) confirmed its in vivo binding to sog_Distal but also identified widespread binding throughout the genome, comparable to Zld. Furthermore, chromatin assays (ATAC-seq) demonstrate that Opa, like Zld, influences chromatin accessibility genome-wide at cellularization, suggesting both are pioneer factors with common as well as distinct targets. Lastly, embryos lacking opa exhibit widespread, late patterning defects spanning both axes. Collectively, these data suggest Opa is a general timing factor and likely late-acting pioneer factor that drives a secondary wave of zygotic gene expression contributor: Theodora Koromila (ATAC-seq-RNA-seq) contributor: Fan Gao (Bioinformatic analysis) contributor: Angelike Stathopoulos (PI) contributor: Peng He (Bioinformatic analysis)

2020-08-02 | GSE153328 | GEO

Zygotic pioneer factor activity of Odd-paired/Zic is necessary for establishing the Drosophila Segmentation Network

Project description:Because chromatin determines whether information encoded in DNA is accessible to transcription factors, dynamic chromatin states in development may constrain how gene regulatory networks impart embryonic pattern. To determine the interplay between chromatin states and regulatory network function, we performed ATAC seq on Drosophila embryos over the period spanning the establishment of the segmentation network, comparing wild-type and mutant embryos in which all graded maternal patterning inputs are eliminated. While during the period between zygotic genome activation and gastrulation many regions maintain stable accessibility, cis-regulatory modules (CRMs) within the segmentation network undergo extensive patterning-dependent changes in accessibility. A component of the network, Odd-paired (opa), is necessary for pioneering accessibility of segmentation network CRMs. While opa is necessary to drive late opening of segmentation network cis-regulatory elements, competence for opa to pioneer is regulated over time. These results indicate that dynamic systems for chromatin regulation directly impact the interpretation of embryonic patterning information.

2020-02-01 | GSE141538 | GEO

Drosophila esc mutants show Hox-derepression along the AP axis in CNS

Project description:Mutating esc (extra sex-combs), maternal and zygotic, leads to loss of H3K27me3 and affects Hox-patterning along the AP-axis in neurogenesis

2018-03-02 | GSE111324 | GEO

Catalytic-dependent and independent functions of the histone acetyltransferase CBP promote pioneer factor-mediated zygotic genome activation [RNA-seq]

Project description:Immediately after fertilization the genome is transcriptionally quiescent. Maternally encoded pioneer transcription factors reprogram the chromatin state and facilitate the transcription of the zygotic genome. In Drosophila, transcription is initiated by the pioneer factor Zelda. While Zelda-occupied sites are enriched with histone acetylation, a post-translational mark associated with active cis-regulatory regions, the functional relationship between Zelda and histone acetylation in zygotic genome activation remained unclear. We show that Zelda-mediated recruitment of the histone acetyltransferase CBP is essential for zygotic transcription and embryonic development. CBP catalytic activity is necessary for release of RNA Polymerase II (Pol II) into transcription elongation. However, CBP largely activates zygotic transcription independent of acetylation through Pol II recruitment. Neither acetylation nor CBP are required for the pioneering function of Zelda. Our data suggest that pioneer factor-mediated recruitment of CBP is a conserved mechanism required to activate zygotic transcription but that this role is separable from the function of pioneer factors in restructuring chromatin accessibility.

2024-10-15 | GSE274629 | GEO

poly-A RNA profiling of Drosophila intermediate neural porgenitors (INPs) of three different temporal states reveal genes involved in temporal patterning

Project description:Neural stem cells (NSCs) generate highly diverse neurons over time by acquiring new features, a phenomenon called as temporal patterning. However the mechanisms underlying temporal patterning still remains poorly understood. Here, we describe a method that allows to isolate different temporal stages of Drosophila transit amplifying cells called intermediate neural porgenitors (INPs). We identified odd-paired (opa) as the regulator of the transition from first to second temporal stages, which are defined by D and Grh expression. We demonstrated that opa is required for correct neural output and brain morphology. We showed that opa achieves this transition via repressing D. Together with upstream SWI/SNF complex, D and opa forms an incoheren feed forward loop, which results in successive expression of temporal identities.

2019-07-29 | GSE127516 | GEO

The pioneer transcription factor Zelda facilitates the exit from regeneration and restoration of patterning in Drosophila

Project description:For a damaged tissue to regenerate, the injured site must repair the wound, proliferate, and restore the correct patterning and cell types. We found that Zelda, a pioneer transcription factor largely known for its role in embryonic zygotic genome activation, is dispensable for normal wing development but crucial for wing disc patterning during regeneration. Impairing Zelda function during disc regeneration resulted in adult wings with a plethora of cell fate errors, affecting the veins, margins, and posterior compartment identity. Using CUT&RUN, we identified and validated targets of Zelda including the cell fate genes cut, Delta and achaete, which failed to return to their normal expression patterns upon loss of Zelda. In addition, Zelda controls expression of factors previously established to preserve cell fate during regeneration like taranis and osa, which stabilizes engrailed expression during regeneration, thereby preserving posterior identity. Finally, Zelda ensures proper expression of the integrins encoded by multiple edematous wings and myospheroid during regeneration to prevent blisters in the resulting adult wing. Thus, Zelda is crucial for maintaining cell fate and structural architecture of the regenerating tissue.

2024-06-26 | GSE268674 | GEO

GAF is essential for zygotic genome activation and chromatin accessibility in the early Drosophila embryo [ChIP-seq]

Project description:Following fertilization, the genomes of the germ cells are reprogrammed to form the totipotent embryo. Pioneer transcription factors are essential for remodeling the chromatin and driving the initial wave of zygotic gene expression. In Drosophila melanogaster, the pioneer factor Zelda is essential for development through this dramatic period of reprogramming, known as the maternal-to-zygotic transition (MZT). However, it was unknown whether additional pioneer factors were required for this transition. We identified an additional maternally encoded factor required for development through the MZT, GAGA Factor (GAF). GAF is necessary to activate widespread zygotic transcription and to remodel the chromatin accessibility landscape. We demonstrated that Zelda preferentially controls expression of the earliest transcribed genes, while genes expressed during widespread activation are predominantly dependent on GAF. Thus, progression through the MZT requires coordination of multiple pioneer-like factors, and we propose that as development proceeds control is gradually transferred from Zelda to GAF.

2021-03-03 | GSE152770 | GEO

GAF is essential for zygotic genome activation and chromatin accessibility in the early Drosophila embryo [RNA-seq]

Project description:Following fertilization, the genomes of the germ cells are reprogrammed to form the totipotent embryo. Pioneer transcription factors are essential for remodeling the chromatin and driving the initial wave of zygotic gene expression. In Drosophila melanogaster, the pioneer factor Zelda is essential for development through this dramatic period of reprogramming, known as the maternal- to-zygotic transition (MZT). However, it was unknown whether additional pioneer factors were required for this transition. We identified an additional maternally encoded factor required for development through the MZT, GAGA Factor (GAF). GAF is necessary to activate widespread zygotic transcription and to remodel the chromatin accessibility landscape. We demonstrated that Zelda preferentially controls expression of the earliest transcribed genes, while genes expressed during widespread activation are predominantly dependent on GAF. Thus, progression through the MZT requires coordination of multiple pioneer-like factors, and we propose that as development proceeds control is gradually transferred from Zelda to GAF.

2021-03-03 | GSE152772 | GEO

GAF is essential for zygotic genome activation and chromatin accessibility in the early Drosophila embryo [ATAC-seq]

2021-03-03 | GSE152771 | GEO

Cell-type-specific chromatin occupancy by the pioneer factor Zelda drives key developmental transitions in Drosophila

Project description:During early Drosophila embryogenesis, the essential pioneer factor Zelda defines hundreds of cis-regulatory regions and in doing so reprograms the zygotic transcriptome. While Zelda is essential later in development, it is unclear how the ability of Zelda to define cis-regulatory regions is shaped by cell-type specific chromatin architecture established during differentiation. Asymmetric division of neural stem cells (neuroblasts) in the fly brain provide an excellent paradigm for investigating the cell-type specific functions of this pioneer factor. Zelda is expressed in neuroblasts, and we show that Zelda synergistically functions with Notch to maintain neuroblasts in an undifferentiated state. Zelda misexpression can reprogram progenitor cells to neuroblasts, but this capacity is limited by transcriptional repressors critical for progenitor commitment. Zelda genomic occupancy in neuroblasts is reorganized as compared to the embryo, despite sharing many target genes in these two developmental stages. This reorganization is likely driven by differences in chromatin accessibility and cofactor availability. We propose that Zelda regulates essential transitions in the neuroblasts and embryo through a shared gene regulatory network by defining cell-type specific enhancers.

2021-11-05 | GSE150931 | GEO

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data