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Coexpression clique No. 203, sre-33-ZK1025.1_8337, on the genome-wide coexpression clique map for the nematode GPL200 platform. |
All available microarray datasets for the GPL200 platform (Affymetrix C. elegans Genome Array) were obtained from the GEO repository. This included 2243 individual microarray experiments. These were normalized against each other with the software RMAexpress (Bolstad, 2014). Based on these normalized values, Pearsons correlation coefficients were obtained for each probe-probe pair of the 22,620 probes represented on this array type. The resulting list of correlation coefficients was then ranked to generate the ranked coexpression database with information on each probe represented on the GPL200 platform. |
WBPaper00061527:sre-33-ZK1025.1_8337
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Genes down-regulated following nhr-25(RNAi). |
Pair-wise significance testing (mutant/RNAi vs. wild-type/vector) was performed using the Bioconductor package limma and p-values were initially corrected for multiple testing using the false discovery rate (FDR) method of Benjamini and Hochberg. Authors defined differential expression as log2(ratio) >= 0.848 with the FDR set to 5%, and p-value <= 0.001. |
WBPaper00045015:nhr-25(RNAi)_downregulated
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Genes expressed in N2. |
Expressed transcripts were identified on the basis of a Present call in 3 out of 4 N2 experiments as determined by Affymetrix MAS 5.0. |
WBPaper00025141:N2_Expressed_Genes
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Genes downregulated in mdt-15(RNAi) animals comparing with control. |
Author used empirical Bayes fitting in limma with multiple hypothesis correction method BH, and considered genes with a P-value < 0.05 to be differentially expressed. |
WBPaper00031850:mdt-15(RNAi)_downregulated
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Genes expressed in embryonic motor neurons (identified by unc-4::GFP expressing cells). |
Genes called Present by MAS 5.0 in 2 out of 3 unc-4::GFP hybridizations. |
WBPaper00025141:unc-4::GFP_Expressed_Genes
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Expression Pattern Group F, enriched for genes involved in embryonic development. These patterns have in common that they all have genes of which the expression goes up after the juvenile stage. The expression of the genes in these patterns remains high or even goes up after reproduction. |
The significance (P 0.0001) of the relative age (time) was used to determine if a gene was differentially expressed between the three age (time) groups. The effect of this factor explaining gene expression differences was used to determine if the expression went up or down during the two age/time periods (t1 - t2 and t2 -t3). Authors used a permutation approach to determine the thresholds for the different mapping strategies. For each of the used models for eQTL mapping, authors used 23,000 permutations. For each permutation, authors randomly picked a spot; each spot could only be picked once. The gene expression and relative lifespan values were than randomly distributed over the RILs (and time points) and used for mapping. In this way, authors obtained a threshold for each of the explaining factors. For the single time points, authors used a FDR of 0.01 to adjust for multiple testing. The genome-wide threshold for this FDR is -log10 P = 3.8 for each of the three time points. For the combined models (t1 to t2 and t2 to t3), authors used a genome-wide threshold of -log10 P = 4, which resembles an FDR of 0.006, 0.001, and 0.006 for marker, age, and the interaction between marker and age, respectively. To determine the threshold for the single gene examples, authors used 1000 permutations as in the genome-wide threshold. The difference is that they use the gene under study in all of the permutations. The P-values for the gene specific thresholds were determined at FDR = 0.05. |
WBPaper00036286:Pattern_F
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