Dataset Information

NDR kinase Tricornered genetically interacts with Ccm3 and metabolic enzymes in Drosophila melanogaster tracheal development

ABSTRACT: The GckIII pathway is a Hippo-like kinase module defined by sequential activation of Ste20 kinases Thousand and One (Tao) and Germinal Center Kinase III (GckIII), followed by nuclear dbf2-related (NDR) kinase Tricornered (Trc). We previously uncovered a role for the GckIII pathway in regulating tube morphology in the Drosophila melanogaster tracheal (respiratory) system. The trachea form a network of branched epithelial tubes essential for oxygen transport, and are structurally analogous to branched tubular organs in vertebrates, such as the vascular system. In the absence of GckIII pathway function, aberrant dilations form in tracheal tubes characterised by mislocalized junctional and apical proteins, suggesting that the GckIII pathway is important in maintaining tube integrity in development. Here, we observed a genetic interaction between trc and Cerebral cavernous malformations 3 (Ccm3), the Drosophila ortholog of a human vascular disease gene, supporting our hypothesis that the GckIII pathway functions downstream of Ccm3 in trachea, and potentially in the vertebrate cerebral vasculature. However, how GckIII pathway signalling is regulated and the mechanisms that underpin its function in tracheal development are unknown. We undertook biochemical and genetic approaches to identify proteins that interact with Trc, the most downstream GckIII pathway kinase. We found that known GckIII and NDR scaffold proteins are likely to control GckIII pathway signalling in tracheal development, consistent with their conserved roles in Hippo-like modules. Furthermore, we show genetic interactions between trc and multiple enzymes in glycolysis and oxidative phosphorylation, suggesting a potential function of the GckIII pathway in integrating cellular energy requirements with maintenance of tube integrity.

INSTRUMENT(S): LTQ Orbitrap

ORGANISM(S): Drosophila Melanogaster (fruit Fly)

TISSUE(S): Embryo

SUBMITTER: Alexey Veraksa

LAB HEAD: Alexey Veraksa

PROVIDER: PXD038912 | Pride | 2023-03-13

REPOSITORIES: Pride

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Publications

NDR kinase tricornered genetically interacts with Ccm3 and metabolic enzymes in Drosophila melanogaster tracheal development.

Hudson Joshua J Paul Sayantanee S Veraksa Alexey A Ghabrial Amin A Harvey Kieran F KF Poon Carole C

G3 (Bethesda, Md.) 20230301 3

The Germinal Center Kinase III (GckIII) pathway is a Hippo-like kinase module defined by sequential activation of Ste20 kinases Thousand and One (Tao) and GckIII, followed by nuclear dbf2-related (NDR) kinase Tricornered (Trc). We previously uncovered a role for the GckIII pathway in Drosophila melanogaster tracheal (respiratory) tube morphology. The trachea form a network of branched epithelial tubes essential for oxygen transport, and are structurally analogous to branched tubular organs in ve ...[more]

PMID: 36653023

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Project description:Abstract: The Drosophila trachea is a branched tubular epithelia that transports oxygen and other gases. trachealess (trh), which encodes a bHLH-PAS transcription factor, is among the first genes to be expressed in the cells that will form the trachea. In the absence of trh, tracheal cells fail to invaginate to form tubes and remain on the embryo surface. Expression of many tracheal-specific genes depends on trh, but all of the known targets have relatively minor phenotypes compared to loss of trh, suggesting that there are additional targets. To identify uncharacterized transcriptional targets of Trh and to further understand the role of Trh in embryonic tracheal formation, we performed an in situ hybridization screen using a library of ~100 tracheal-expressed genes identified by the Berkeley Drosophila Genome Project (BDGP). Surprisingly, expression of every tracheal gene we tested was dependent on Trh, suggesting a major role for Trh in activation and maintenance of tracheal gene expression. A re-examination of the interdependence of the known early-expressed transcription factors, including trh, ventral veinless (vvl) and knirps/knirps-related (kni/knrl), suggests a new model for how gene expression is controlled in the trachea, with trh regulating expression of vvl and kni, but not vice versa. A pilot screen for the targets of Vvl and Kni/Knrl revealed that Vvl and Kni have only minor roles compared to Trh. Finally, genome-wide microarray experiments identified additional Trh targets and revealed that a of biological processes are affected by the loss of trh. Goals: The goals of the microarray experiments were to identify additional targets of the Trh transcription factor to learn the range of genes regulated by this transcription factor during embryogenesis. Our in situ screen revealed that Trh is required for all tested tracheal genes. Our new data now shows that Trh affects a range of biological processes. RNA was isolated from stage 11-16 wild type Drosophila embryos and compared to RNA from trh null mutant embryos of the same age; all samples were hybridized to the Drosophila Genome 2.0 Affymetrix array. Three individual replicates were obtained for each sample.

Dataset Information

NDR kinase Tricornered genetically interacts with Ccm3 and metabolic enzymes in Drosophila melanogaster tracheal development

Publications

NDR kinase tricornered genetically interacts with Ccm3 and metabolic enzymes in Drosophila melanogaster tracheal development.

Similar Datasets

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