Comparative temporal analysis of wild-type Ptf1a, Neurog2 and mutant Ptf1a (Ptf1aW224A/W242A) overexpressing Xenopus explant transcriptomes after 6 and 25 hours of DEX induction.
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ABSTRACT:
ORGANISM(S): Xenopus laevis
PROVIDER: GSE86649 | GEO | 2017/09/08
SECONDARY ACCESSION(S): PRJNA342823
REPOSITORIES: GEO
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Project description:The Ptf1a gene has essential functions during several stages of pancreas development. It is expressed in the naïve endoderm and required pancreas cell fate specification; it is also required later in the differentiation and maintenance of acinar cells. To identify the regulatory genetic program downstream of Ptf1a required for early pancreatic fate acquisition, we used microarrays to perform a comprehensive gene expression analysis of Ptf1a overexpressing endodermal tissue at NF32 and NF36. The results revealed an up-regulation on 1142 probe sets over 2-fold. Additional analyses, by in situ hybridizations, identified 9 genes that were endodermally expressed after the onset of endogenous Ptf1a; STXBP1, putative transmembrane protein TA-2, C25H, IGFBP1, IRF1, HALPN3, Hey1, sestrin 1, syndecan-4. These results provide insight into the regulatory network activated by Ptf1a during early pancreas development.
2012-11-01 | GSE34193 | GEO
Project description:The Ptf1a gene has essential functions during several stages of pancreas development. It is expressed in the naM-CM-/ve endoderm and required pancreas cell fate specification; it is also required later in the differentiation and maintenance of acinar cells. To identify the regulatory genetic program downstream of Ptf1a required for early pancreatic fate acquisition, we used microarrays to perform a comprehensive gene expression analysis of Ptf1a overexpressing endodermal tissue at NF32 and NF36. The results revealed an up-regulation on 1142 probe sets over 2-fold. Additional analyses, by in situ hybridizations, identified 9 genes that were endodermally expressed after the onset of endogenous Ptf1a; STXBP1, putative transmembrane protein TA-2, C25H, IGFBP1, IRF1, HALPN3, Hey1, sestrin 1, syndecan-4. These results provide insight into the regulatory network activated by Ptf1a during early pancreas development. In order to identify downstream targets of Ptf1a, two microarrays were performed at different time-points. The two microarrays compared control pancreatic tissue (GFP) and pancreatic tissue over-expressing Ptf1a (Ptf1a+GFP). The first microarray was performed at NF32, hence renamed MA32, 8 hours after the initial expression of endogenous Ptf1a. A second microarray was performed at NF36 (MA36), 8 hours after the first one. Ptf1a+gfp mRNA or gfp mRNA alone was injected into the two dorso-vegetal blastomeres of eight-cell embryos, targeting the anterior endoderm, and 40/48 hours later the anterior endoderm was dissected out. Approximated 15 endoderm explants were pooled for each RNA preparation, and both control and experimental samples were collected from the same batch of embryos; this was done in triplicate at NF32 and in quadruplicate at NF36 (Fig. 1A). For the NF32 microarray, we used the Affymetrix 3M-bM-^@M-^Y Xenopus laevis Genome 2.0 GeneChip, whereas for the NF36 microarray we used the Affymetrix 3M-bM-^@M-^Y Xenopus laevis Genome 1.0 GeneChip; the NF36 microarray was performed prior to the release of the 2.0 GeneChip.
2012-11-01 | E-GEOD-34193 | biostudies-arrayexpress
Project description:The proneural NEUROG2 is essential for neuronal commitment, cell cycle exit and neuronal differentiation. Characterizing genes networks regulated downstream of NEUROG2 is therefore of prime importance. To identify NEUROG2 early response genes, we combined gain of function in the neural tube with a global detection of modified transcripts using microarrays. We included in our study a mutant form of NEUROG2 (NEUROG2AQ) that cannot bind DNA and cannot trigger neurogenesis. Using this approach, we identified 942 genes modified at the onset of NEUROG2 activation. The global analysis of functions regulated by NEUROG2 allowed unmasking its rapid impact on cell cycle control. We found that NEUROG2 specifically represses a subset of cyclins acting at the G1 and S phases of the cell cycle, thereby impeding S phase re-entry. This repression occurs before modification of p27kip1, indicating that the decision to leave the cell cycle precedes the activation of this Cyclin-dependant Kinase Inhibitor. Moreover, NEUROG2 down-regulates only one of the D-type cyclins, cyclinD1, and maintaining cyclinD1 blocks the ability of the proneural to trigger cell cycle exit, without altering its capacity to trigger neuronal differentiation. The fact that NEUROG2 represses a subset but not all cell cycle regulators indicates that cell cycle exit is not an indirect consequence of neuronal differentiation but is precisely controlled by NEUROG2. Altogether our findings indicate that NEUROG2, by specifically repressing G1 and S cyclins, allows committed neuronal precursors to perform their last mitosis but blocks their re-entry in the cell cycle, thus favouring cell cycle exit. Stage HH10-11 embryos (11 to 15 somites) were electroporated with a control vector (pGIG-GFP), a NEUROG2-expressing vector (pCIGNEUROG2-GFP), or a NEUROG2AQ-expressing vector (pCIGNEUROG2AQ-GFP). For each biological replicate, neural tubes from 20 embryos were pooled for GFP+ cells collection. GFP+ cells were collected 6h later using FACS sorting (Epics Altra HSS cell sorter, Toulouse Rio platform) and processed for RNA probe preparation and hybridization on Affymetrix microarrays. For each experimental condition, four biological replicates were processed.
2012-05-04 | E-GEOD-37782 | biostudies-arrayexpress
Project description:The proneural NEUROG2 is essential for neuronal commitment, cell cycle exit and neuronal differentiation. Characterizing genes networks regulated downstream of NEUROG2 is therefore of prime importance. To identify NEUROG2 early response genes, we combined gain of function in the neural tube with a global detection of modified transcripts using microarrays. We included in our study a mutant form of NEUROG2 (NEUROG2AQ) that cannot bind DNA and cannot trigger neurogenesis. Using this approach, we identified 942 genes modified at the onset of NEUROG2 activation. The global analysis of functions regulated by NEUROG2 allowed unmasking its rapid impact on cell cycle control. We found that NEUROG2 specifically represses a subset of cyclins acting at the G1 and S phases of the cell cycle, thereby impeding S phase re-entry. This repression occurs before modification of p27kip1, indicating that the decision to leave the cell cycle precedes the activation of this Cyclin-dependant Kinase Inhibitor. Moreover, NEUROG2 down-regulates only one of the D-type cyclins, cyclinD1, and maintaining cyclinD1 blocks the ability of the proneural to trigger cell cycle exit, without altering its capacity to trigger neuronal differentiation. The fact that NEUROG2 represses a subset but not all cell cycle regulators indicates that cell cycle exit is not an indirect consequence of neuronal differentiation but is precisely controlled by NEUROG2. Altogether our findings indicate that NEUROG2, by specifically repressing G1 and S cyclins, allows committed neuronal precursors to perform their last mitosis but blocks their re-entry in the cell cycle, thus favouring cell cycle exit.
2012-05-05 | GSE37782 | GEO
Project description:Because Ptf1a is a transcription factor, this protein should regulate transcription of various genes in Ptf1a-expressing cells of the hypothalamus. To detect those downstream genes, we purified cells in the Ptf1a-lineage from the hypothalamus at E14.5 by FACS sorting, subsequently performed RNA-seq analysis and obtained 706 differentially expressed genes. 386 genes had lower and 320 had higher expression in Ptf1a-lineage cells from homozygous Ptf1a deficient mice. The down-regulated genes included Prdm13, Corl2 and Lhx5 that were known downstream targets of Ptf1a, in addition, Sox3 and Nkx2-1, which are known to be required for hypothalamic development. Interestingly, among those affected genes, we detected several genes encoding transmembrane and/or secreted proteins, such as Jag2 (ligand for Notch receptors), Sema6b, Sema4g (ligands for Plexin family proteins). These genes may have a non-cell autonomous role in the sexual differentiation of hypothalamic cells adjacent to Ptf1a-lineage cells. Kiss1 expression was not altered, as was expected by the finding that most Kiss1-expressing cells were not in the Ptf1a lineage.
2018-04-21 | GSE112935 | GEO
Project description:This experiment used RNA-Seq technology to explore gene expression in mouse Ptf1a^YFP/+ [het] FACS sorted cells at E11.5 (early pancreatic Multipotent Progenitor Cells) and E15.5 (nascent acinar cells) as well as in Ptf1a^YFP/YFP [null] at E11.5 (delayed early MPC). 376 selected genes identified as differentially expressed between early pancreatic MPC and nascent acinar cells or between early pancreatic and delayed early MPCs have then been examined by Taqman Low Density Arrays (TLDAs) with Real Time RT-PCR for each 1-day time point from E10.5 to E15. 5 in Ptf1a^YFP/+ [het] and for E10.5 and E11.5 in Ptf1aYFP/YFP [null] . Finally, 94 genes identified in the first phase of TLDAs (including 2 endogenous control, Gapdh and 18S) were analyzed in a second TLDA phase for each 1-day time point from E10.5 to -E18.5 in Ptf1a^YFP/+ [het] and for E11.5 in Ptf1aYFP/YFP [null] with biological replicates (n>=3) for each time point.
2014-11-15 | E-MTAB-449 | biostudies-arrayexpress
Project description:Comparative temporal analysis of wild-type Ptf1a, Neurog2 and mutant Ptf1a (Ptf1aW224A/W242A) overexpressing Xenopus explant transcriptomes after 6 and 25 hours of DEX induction.
| PRJNA342823 | ENA
Project description:Ptf1a and RbpjL form a complex. We wanted to identify genes that are regulated by the complex and distinguish those possibly regulated independently by Ptf1a and RbpjL in mouse pancreas using ChIP-seq technology. Chromatin Immunoprecipitations (ChIPs) for Ptf1a and RbpjL were performed with a number of mouse pancreas samples. Samples were sequenced with Solexa and sequenced DNA from Input (n=2), Ptf1a ChIP (n = 3), and RbpjL ChIP (n=2) samples were aligned to the NCBI Genome Build 37 M-^V mm9 to determine regions that were enriched for binding by Ptf1a and RbpjL.
2014-12-23 | E-MTAB-3197 | biostudies-arrayexpress
Project description:Peripheral somatosensory input is modulated in the dorsal spinal cord by a network of excitatory and inhibitory interneurons. PTF1A is a transcription factor essential in dorsal neural progenitors for specification of these inhibitory neurons. Thus, mechanisms regulating Ptf1a expression are key for generating neuronal circuits underlying somatosensory behaviors. Mutations targeted to distinct cis-regulatory elements for Ptf1a in mice, tested the in vivo contribution of each element individually and in combination. Mutations in an auto-regulatory enhancer resulted in reduced levels of PTF1A, and reduced numbers of specific dorsal spinal cord inhibitory neurons, particularly those expressing Pdyn and Gal.
2020-03-30 | GSE146238 | GEO
Project description:To investigate the role of SHP2 (Ptpn11) in pancreatic carcinogenesis, murine pancreatic whole tissue RNA samples of 9 week old mice with the genotypes Ptf1a-Cre;LSL-KrasG12D (ID-labels Kxxx) and Ptf1a-Cre;LSL-KrasG12D;Ptpn11fl/fl (ID-labels Mxxxx) were analyzed by microarray.
2018-03-30 | E-MTAB-6399 | biostudies-arrayexpress