Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Neuroblastoma-associated mutations in Drosophila Alk peturb neuronal differentiation and promote neuronal survival.

ABSTRACT: Activating mutations in the Anaplastic Lymphoma Kinase (ALK) receptor tyrosine kinase (RTK) are found in pediatric neuroblastoma, where they are often associated with poor prognosis. To study the effects of ALK-activating mutations in a genetically controllable system we employed CRIPSR/Cas9 to incorporate orthologues of the oncogenic human driver mutations ALKF1174 and ALKY1278S in the Drosophila Alk locus. AlkF1251 and AlkY1355S mutant Drosophila exhibit phenotypes similar to that previously associated with enhanced Alk signaling. Unexpectedly, both mutant alleles are still dependent on the presence of Jeb ligand for activation, as neither can rescue mutants of the Alk ligand Jeb. However, both Alk mutant third instar brains display hyperplasia, represented by increased numbers of Alk-positive neuronal populations. Despite this hyperplasic phenotype within the central brain area, no brain tumors were observed in mutant animals. Further investigation indicated that larval brain hyperplasia in Alk mutants was not caused by significantly increased rates of proliferation, but rather by decreased levels of apoptosis in the larval brain. Using single cell RNA sequencing (scRNAseq) analysis, we identify maintained neuronal fate change during the temporal fate specification of in the mushroom body lineages, with AlkY1355S mutants displaying precocious a’b’ neuron identity. These findings shed important light on the role of Alk in perturbation of neurodevelopmental processes and highlight the potential of activating Alk mutations to promote survival in neuronal lineages

ORGANISM(S): Drosophila melanogaster

PROVIDER: GSE198850 | GEO | 2022/06/27

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Neuroblastoma-associated mutations in Drosophila Alk peturb neuronal differentiation and promote neuronal survival.

Project description:Neuroblastoma-associated mutations in Drosophila Alk peturb neuronal differentiation and promote neuronal survival.

| PRJNA817171 | ENA

RNA-seq: Transcriptome profile between wild type control and Alk-YS mutant in the Drosophila larval CNS.

Project description:We assessed the differential expression of genes in the Drosophila larval CNS for the Alk mutant and control to understand how the transcriptional responce in Alk-YS mutant.

2022-05-31 | GSE198812 | GEO

The Alk receptor tyrosine kinase regulates Sparkly, a novel activity regulating neuropeptide precursor in the Drosophila CNS

Project description:Numerous roles for the Alk receptor tyrosine kinase have been described in Drosophila, including functions in the CNS, however the molecular details are poorly understood. To gain mechanistic insight, we employed Targeted DamID (TaDa) transcriptional profiling to identify targets of Alk signaling in the larval CNS. TaDa was employed in larval CNS tissues, while genetically manipulating Alk signaling output. The resulting TaDa data were analysed together with larval CNS scRNA-seq datasets performed under similar conditions, identifying a role for Alk in the transcriptional regulation of neuroendocrine gene expression. Further integration with bulk/scRNA-seq and protein datasets from larval brains in which Alk signaling was manipulated, identified a previously uncharacterized Drosophila neuropeptide precursor encoded by CG4577 as an Alk signaling transcriptional target. CG4577, which we named Sparkly (Spar), is expressed in a subset of Alk-positive neuroendocrine cells in the developing larval CNS, including circadian clock neurons. In agreement with our TaDa analysis, overexpression of the Drosophila Alk ligand Jeb resulted in increased levels of Spar protein in the larval CNS. We show that Spar protein is expressed in circadian (Clock) neurons, and Spar mutants exhibit defects in sleep and circadian rhythm control. In summary, we report a novel activity regulating neuropeptide precursor gene that is regulated by Alk signaling in the Drosophila CNS.

2024-03-05 | GSE229518 | GEO

Glass promotes the differentiation of both neuronal and non-neuronal cells in the Drosophila eye

Project description:Multiple cell types can be specified from a single pool of progenitors through the combinatorial activity of transcriptional regulators, which activate distinct developmental programs to establish different cell fates. The zinc finger transcription factor Glass is required for neuronal progenitors in the Drosophila eye imaginal disc to acquire a photoreceptor identity. Glass is also expressed in non-neuronal cone and pigment cells, but its role in these cells is unknown. To examine how Glass activity is affected by the cellular context, we misexpressed it in different tissues. When expressed in neuroblasts of the larval brain or in epithelial cells of the wing disc, Glass activated both a common core set of target genes and distinct gene sets specific to each tissue. In addition to photoreceptor-specific genes, Glass induced markers of cone and pigment cells. Cell type-specific glass mutations generated in cone or pigment cells using somatic CRISPR revealed autonomous developmental defects, and expressing Glass specifically in these cells partially rescued glass mutant phenotypes. Glass thus acts in both neuronal and non-neuronal cells to promote their differentiation into functional components of the eye, suggesting that it is a determinant of organ identity.

2017-11-01 | GSE99303 | GEO

Nrf2 dictates the neuronal survival and differentiation of embryonic zebrafish harboring compromised tRNA synthetase

Project description:tRNA synthetase deficiency leads to unfolded protein responses in neuronal disorders; however, its function in embryonic neurogenesis remains unclear. This study identified an aars1cq71/cq71 mutant zebrafish allele that showed increased neuronal apoptosis and compromised neurogenesis. aars1 transcripts were highly expressed in primary neural progenitor cells, and their aberration resulted in protein overloading and activated Perk. nfe2l2b, a paralog of mammalian Nfe2l2, which encodes Nrf2, is a pivotal executor of Perk signaling that regulates neuronal phenotypes in aars1cq71/cq71 mutants. Interference of nfe2l2b in nfe2l2bΔ1/Δ1 mutants did not affect global larval development. However, aars1cq71/cq71;nfe2l2bΔ1/Δ1 mutant embryos exhibited increased neuronal cell survival and neurogenesis compared with their aars1cq71/cq71 siblings. nfe2l2b was harnessed by Perk at two levels. Its transcript was regulated by Chop, an implementer of Perk. It was also phosphorylated by Perk. Both pathways synergistically assured the nuclear functions of nfe2l2b to control cell survival by targeting p53. Our study extends the understanding of tRNA synthetase in neurogenesis and implies that Nrf2 is a cue to mitigate neurodegenerative pathogenesis.

2022-08-09 | GSE196846 | GEO

Expression data from neuroblastoma of TH-MYCN/KI Alk mice

Project description:Neuroblastoma is an embryonal neoplasm that remains of dramatic prognosis in its aggressive forms. Activating mutations of the ALK tyrosine kinase receptor have been identified in sporadic and familial cases of this cancer. We generated knock-in mice carrying the two most frequent Alk mutations observed in neuroblastoma patients. We used microarrays to detail the global programme of gene expression underlying the impact of ALK mutations on neuroblastoma formation in a MYCN amplified background. We selected several murine neuroblastoma tumors for RNA extraction and hybridization on Affymetrix microarrays. We generated three groups of tumors: 10 MYCN amplified tumors, 11 MYCN amplified/ALK F1174L tumors and 10 MYCN amplified/ALK R1275Q tumors.

2014-06-24 | E-GEOD-46583 | biostudies-arrayexpress

Genome wide gene expression profiles of Drosophila l(3)mbt larval brains and cultured tumors

Project description:Mutants in the Drosophila gene lethal (3) malignant brain tumor cause malignant growth in the larval brain. This data shows the changes in gene expression profile associated to mutations in l(3)mbt, both in situ in third instar larval brains and in tumors cultured for 1 5 and 10 (T1, T5, T10) rounds of allograft culture

2011-02-01 | GSE24917 | GEO

Altered chromatin occupancy of patient-associated H4 mutants misregulate neuronal differentiation [ChIP-seq]

Project description:Chromatin integrates extracellular signals to regulate gene expression and, therefore, tightly controls development. Mutations in histone genes, including H3.3 and H4, were recently identified in children with developmental disorders characterized by intellectual disability and dysmorphic facial features1–7. However, the mechanistic and functional roles of these de novo, heterozygous germline mutations remain largely unknown. Here, we focus on the histone H4 lysine 91 to arginine (H4K91R) or glutamine (H4K91Q) mutations located within the highly conserved core histone fold domain. Our findings demonstrate that H4K91 mutants form aberrant nuclear puncta in mouse embryonic stem cells (mESCs), as well as in differentiated neural cells in vitro and in vivo. Genome-wide analyses revealed that H4K91 mutants accumulate ectopically at H3.3 and H3K9me3-enriched heterochromatin regions. Mechanistically, H4K91 mutants demonstrated enhanced binding to histone H3 variant H3.3, and ablation of H3.3 or the H3.3-specific chaperone DAXX diminished the formation of H4 mutant puncta and enrichment at heterochromatin regions. Additionally, H4 mutant expression increased chromatin accessibility in mammalian cells. Phenotypically, H4 mutant mice exhibit reduced brain size and altered cortical neuron layers, reminiscent of microcephaly phenotypes observed in patients. Consistent with the altered brain development in vivo, the expression of H4 mutants alter developmental gene expression and accelerate pro-neural differentiation in cell culture models. Together, these studies reveal multiple concurrent pathogenic mechanisms of H4 mutants found in developmental disorders and further our understanding of how histone mutants regulate cell fate during development.

2023-10-19 | GSE231566 | GEO

Altered chromatin occupancy of patient-associated H4 mutants misregulate neuronal differentiation [RNA-seq]

2023-10-19 | GSE231558 | GEO

Expression data from neuroblastoma of TH-MYCN/KI Alk mice

2014-06-24 | GSE46583 | GEO