C. elegans during lethargus
Ontology highlight
ABSTRACT:
ORGANISM(S): Caenorhabditis elegans
SUBMITTER: Keith Shockley
PROVIDER: E-GEOD-46291 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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Project description:To identify genes differentially expressed during L3 lethargus, we collected RNA during the third larval stage (L3) lethargus period, 37 hours after feeding developmentally-arrested L1 animals. Animals in lethargus were identified based on quiescence of locomotion and feeding. Additional time point for RNA collection was in the mid-L3 stage, 32 hours after feeding developmentally-arrested L1 animals. These samples were interrogated with the Affymetrix C. elegans Genome Array. A total of 153 gene transcripts were up regulated, and 48 gene transcripts were down regulated, during the L3 lethargus period compared to the L3 stage (false discovery rate (FDR) < 0.05). There were 2 groups and 3x replication for each group, for 6 total samples. The groups were (1) L3 and (2) L3-lethargus. We compared L3-lethargus vs L3 using R/maanova. The permutation based p-values for each test were significant for FDRM-bM-^IM-$5%.
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Project description:To identify genes differentially expressed during the molt, we collected RNA 30-40 minutes after feeding cessation at the start of the fourth larval stage (L4) lethargus. Additional time points for RNA collection were in the mid-L4 stage, approximately four hours prior to lethargus, and in the young adult stage, four hours after lethargus. These samples were interrogated with the Affymetrix C. elegans Genome Array. A total of 1,804 gene transcripts were up regulated, and 1,088 gene transcripts were down regulated, during the L4 lethargus period compared to the L4 and Adult stages (false discovery rate (FDR) < 0.05). There were a total of 3 groups and 5x replication for each group, for 15 total samples that were analyzed. The groups were (1) L4, (2) L4-lethargus, (3) Adult. We generated the following pairwise comparisons using R/maanova: L4-lethargus vs L4, L4-lethargus vs Adult. The permutation based p-values for each test were multiplied by 2 and transcripts with an FDRM-bM-^IM-$5% were selected.
2014-04-18 | E-GEOD-46289 | biostudies-arrayexpress
Project description:Spatiotemporal control of gene expression is crucial for development and subject to evolutionary changes. Although proteins are the final product of most genes, the developmental proteome of an animal has not yet been comprehensively defined, and the correlation between RNA and protein abundance during development is largely unknown. Here, we globally measured and compared protein and mRNA expression changes during the life cycle of the nematodes C. elegans and C. briggsae, separated by ~30 million years of evolution. We observed that developmental mRNA and protein changes were highly conserved, to a surprisingly similar degree, but poorly correlated within a species, suggesting important and widespread post-transcriptional regulation. Post-transcriptional control was particularly well conserved if mRNA fold changes were buffered on the protein level, indicating a predominant repressive function. Finally, among divergently expressed genes, we identified insulin signaling, a pathway involved in life span determination, as a putative target of adaptive evolution. Samples of C. elegans and C. briggsae were collected at major developmental stages throughout the nematode life cycle. These stages comprise a population of mixed embryonic stages (E), populations of all four larval stages (L1, L2, L3, L4), late L4 larvae (LL4), young adults (YA), and a reference sample consisting of a mixture of all stages. To obtain synchronized worm populations, embryos were extracted by bleaching gravid adults and synchronized by starvation. Later stages were picked at fixed timepoints after determining the developmental stages by microscopic observation. For all stages, at least a single poly(A)-extracted mRNA library was sequenced on a single lane of an Illumina Genome Analyzer IIx.
2014-01-23 | E-GEOD-53359 | biostudies-arrayexpress
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2010-08-04 | E-GEOD-23280 | biostudies-arrayexpress
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