Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of C. elegans mutants daf-2(e1368) and daf-2(e1368);pmk-1(km25), between daf-2(e1368), daf-2(e1368);daf-16(mgDf47)

ABSTRACT: Analysis of genes differentially expressed between daf-2(e1368) and daf-2(e1368);pmk-1(km25) and between daf-2(e1368) and daf-2(e1368);daf-16(mgDf47). These studies identified genes upregulated by wild-type PMK-1 and wild-type DAF-16. Experiment Overall Design: Three independent biological replicates were isolated for each strain. All strains in a replicate were grown and harvested in parallel.

ORGANISM(S): Caenorhabditis elegans

SUBMITTER: Emily Troemel

PROVIDER: E-GEOD-5801 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

p38 MAPK regulates expression of immune response genes and contributes to longevity in C. elegans.

Troemel Emily R ER Chu Stephanie W SW Reinke Valerie V Lee Siu Sylvia SS Ausubel Frederick M FM Kim Dennis H DH

PLoS genetics 20060911 11

The PMK-1 p38 mitogen-activated protein kinase pathway and the DAF-2-DAF-16 insulin signaling pathway control Caenorhabditis elegans intestinal innate immunity. pmk-1 loss-of-function mutants have enhanced sensitivity to pathogens, while daf-2 loss-of-function mutants have enhanced resistance to pathogens that requires upregulation of the DAF-16 transcription factor. We used genetic analysis to show that the pathogen resistance of daf-2 mutants also requires PMK-1. However, genome-wide microarra ...[more]

PMID: 17096597

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Project description:Post-embryonic development of the nematode C. elegans is governed by nutrient availability. L1-stage larvae remain in a state of developmental arrest after hatching until they feed. This “L1 arrest” (or "L1 diapause") is associated with increased stress resistance, supporting starvation survival. Loss of the transcription factor daf-16/FOXO, an effector of insulin/IGF signaling, results in arrest-defective and starvation-sensitive phenotypes. We show that daf-16/FOXO regulates L1 arrest cell-nonautonomously, suggesting that insulin/IGF signaling regulates at least one additional signaling pathway. We used mRNA-seq to identify candidate signaling molecules affected by daf-16/FOXO during L1 arrest. daf-16/FOXO had overlapping but distinct effects on gene expression in L1 arrest compared to daf-2/InsR adults. Notably, dbl-1/TGF-β, a ligand for the Sma/Mab pathway, and daf-36, which encodes an upstream component of the daf-12/NHR steroid hormone signaling pathway, were up-regulated during L1 arrest in a daf-16/FOXO mutant. Using genetic epistasis analysis, we show that dbl-1/TGF-β and daf-12/NHR steroid hormone signaling pathways are required for the daf-16/FOXO arrest-defective phenotype, suggesting that daf-16/FOXO represses dbl-1/TGF-β and daf-36. The dbl-1/TGF-β and daf-12/NHR pathways have not previously been shown to affect L1 development, but we found that disruption of these pathways delayed L1 development in fed larvae, consistent with these pathways promoting development in starved daf-16/FOXO mutants. Though the dbl-1/TGF-β and daf-12/NHR pathways are epistatic to daf-16/FOXO for the arrest-defective phenotype, disruption of these pathways does not suppress starvation sensitivity of daf-16/FOXO mutants. This observation uncouples starvation survival from developmental arrest, indicating that DAF-16/FOXO targets distinct effectors for each phenotype, and revealing that inappropriate development during starvation does not cause the early demise of daf-16/FOXO mutants. Overall, this study shows that daf-16/FOXO promotes developmental arrest cell-nonautonomously by repressing pathways that promote larval development.

Dataset Information

Transcription profiling of C. elegans mutants daf-2(e1368) and daf-2(e1368);pmk-1(km25), between daf-2(e1368), daf-2(e1368);daf-16(mgDf47)

Publications

p38 MAPK regulates expression of immune response genes and contributes to longevity in C. elegans.

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