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Expression Pattern Group C, enriched for genes involved in metabolic processes. |
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_C
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Transcriptions that showed significantly increased expression in skn-1(RNAi) comparing to empty vector injection into rrf-3(pk1426);daf-2(e1368) animals. |
Genes with an absolute fold changeof at least 2 and standard p-values below 0.05 were considered as differentially expressed. |
WBPaper00062193:skn-1(RNAi)_upregulated
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Genes found to be regulated by low-copy overexpression of sir-2.1 with p < 0.014. |
N.A. |
WBPaper00026929:sir-2.1_overexpression_regulated
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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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heat-shock hlh-1 |
Genes enriched in HLH-1 heat shock dataset. |
A two-class unpaired analysis was performed to identify genes that are elevated 1.7-fold or greater when compared with the reference for each dataset, at a false discovery rate of 1.8% or less for M0 and 1.2% or less for the M24 datasets. |
WBPaper00031003:hlh_1_enriched
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Germline-enriched and sex-biased expression profile cluster C. |
hierarchical clustering |
[cgc6390]:Cluster_C
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Bacteria infection: Xenorhabdus nematophila |
Caenorhabditis elegans Genes with expression levels changed significantly after treatment of Xenorhabdus nematophila. |
Differential expression were calculated by empirical eBayes method using eBayes function. P_value <= 0.01 and log2 fold change > 1 were used to call differentially expressed genes in all datasets. |
WBPaper00041606:CE_X.nematophila_regulated
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Bacteria diet: Lactobacillus rhamnosus CNCM I-3690 |
Differentially expressed genes between C.elegans fed with L.rhamnosus strain CNCM I-3690 and control strain E.coli OP50 after 3 days of feeding. |
Differential expression was assayed via limma. Genes were considered differentially expressed when the multiple testing adjusted P-value < 0.01. |
WBPaper00041906:I-3690_vs_OP50_3d
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heat shock |
Genes regulated by heat shock. |
Differences between treatments were visualized by principal component analysis (PCA) plotting with MeV/TM4. Data were initially filtered out for missing values and then subjected to a CLEAR test that combines differential expression and variability using the GEPAS web server at http://www.gepas.org. In our case, the false discovery rate was set to a stringent level of 5 per cent. |
WBPaper00035227:heat_shock_regulated
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Genes with no change in hcf-1(-), no change in sir-2.1(O/E) and upregulated in daf-2(-). |
To identify the genes that show consistent and significant expression changes across the independent biological replicates of hcf-1(-) or sir-2.1(O/E), authors used Significance Analysis of Microarrays (SAM) with a stringent criteria of expected false discovery rate (FDR) set at 0%. |
WBPaper00040184:hcf-1nc_sir-2.1nc_daf-2up
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Genes down regulated in the absence of TDP-1, when the threshold was set at a fold change (FC) of 1.2. |
The management and statistical analysis of the microarray data were performed using the Partek Genomic Suite (Partek, Missouri) and Spotfire DecisionSite software (TIBCO, California). |
WBPaper00040603:tdp-1(lf)_down_vs_N2_FC_1.2
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Genome-wide analysis of developmental and sex-regulated gene expression profile. |
self-organizing map |
cgc4489_group_8
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Genes enriched in intestine. |
To identify genes that are significantly enriched by mRNA tagging, we first normalized the total amount of Cy3 and Cy5 signal to each other in each hybridization. We measured the ratio of the signals from the co-immunoprecipitated mRNA (Cy5) to total RNA in the cell extract (Cy3), and calculated the percentile rank for each gene relative to all genes in each hybridization. The mean percentile rank was determined from eight repeats of the mRNA-tagging experiment. Student's t-test was used to determine which genes showed a mean enrichment significantly greater than the median enrichment for all genes (P<0.001). |
WBPaper00026980:intestine_enriched
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Starvation 2-4 hours at L1 larva stage since hatching. |
Genes that showed significantly changed expression by starvation for 2-4 hours after hatch, by comparing N2 starved and N2 fed animals at L1 larva. |
Normalized log2 GCRMA values were used to assess significance of expression changes with the LIMMA/GCRMA empirical Bayes test. A threshold for significance at a q-value (FDR) of less than 0.05 was used to determine if a gene is differentially expressed. |
WBPaper00053236:Starvation_regulated_N2
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Transcripts with significantly decreased expression after treatment with 0.1mM paraquat vs. control |
Comparisons of each genotype were compared to the wild-type using the Empirical Base (Wright & Simon) algorithm and fold changes were represented on a log2 scale. A threshold of p < 0.05 and a fold change of 1.3 (log2) was set to determine differentially expressed targets. |
WBPaper00045263:0.1mM-paraquat_downregulated
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Genes upregulated by alg-1(-). |
t-statistic difference of > 2.5 with p < 0.01. |
WBPaper00035588:alg-1(-)_upregulated
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Genes downregulated (fold changes < 2-fold) in the worms following exposure of a-SWCNTs (500 mg\/mL) for 48 hr. |
N.A. |
WBPaper00042331:a-SWCNTs_downregulated
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Warm/Cold cycle |
Transcripts that cycle in warm/cold (WC) condition but not in constant cold (CC) condition (pF24<0.02). |
ANOVA prescreening and Fourier analysis. |
WBPaper00037695:WC_5-day
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miRNA targets that are significantly enriched at L1 larva stage. To generate a global view of the dynamics of miRNA-mediated regulation of gene expression during C. elegans development, authors analyzed the mRNAs in the AIN-2-GFP IP results from five developmental stages. The magnitude of the combined interaction of miRNAs with a given target mRNA was assessed by measuring the fold enrichment of that mRNA in AIN-2 IP samples, relative to the abundance of the mRNA in the corresponding total lysate. Because this enrichment in the IP sample versus total lysate directly reflects the miRISC-associated fraction of a given mRNA, high enrichment indicates the likelihood of strong miRNA-mediated regulation of the mRNA, whereas low or negative enrichment indicates the likelihood of weak or absent miRNA regulation of the mRNA. It is also possible that poor enrichment could reflect interactions that occur only in a rare subset of cells at any given stage of development. Transcripts that were significantly enriched (0
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For each transcript represented on the microarray, authors first used all 18 data points from all of the 18 microarrays to calculate its average in-stage standard deviation as SD=SQRT((i=1-K (ni-1)SDi2)/(N-K)), degree of freedom (df)=N-K, where K is the number of developmental stages in which the given transcript had at least one non-missing log2(IP/Total) value; ni is the number of non-missing values in stage i among the K stages; SDi is the standard deviation of the log2(IP/Total) values from all the replicates of stage i; N is the total number of non-missing values for this transcript at all stages. A transcript must have at least one stage with at least two non-missing values to be testable. All of the non-missing values of a transcript at each stage were averaged to generate the stage-average values (Mi for stage i). The standard error of Mi was calculated as SEi=SD/SQRT(ni) (df=N-K), where SD is the average in-stage standard deviation calculated above and ni is the number of non-missing values at stage i, as explained above. Based on the SEi, a one-tailed Students t-test was used to calculate the P-value of enrichment in stage i (Test if Mi>0). The T statistic was constructed as T=Mi/SEi (df=N-K). Mi>0 and enrichment P<0.001 were used as the threshold of enrichment for each stage. |
WBPaper00035084:L1_enriched_AIN-2_IP
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Genes down-regulated after 200 um Quercetin treatment. Fold change < 0.8. |
GCRMA |
WBPaper00040963:Q200_down
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Genes enriched in muscle cells (24hr muscle dataset). Dissociated myo-3::GFP embryos were cultured for 24 hours before FACS sorting. |
A two-class unpaired analysis was performed to identify genes that are elevated 1.7-fold or greater when compared with the reference for each dataset, at a false discovery rate of 1.8% or less for M0 and 1.2% or less for the M24 datasets. |
WBPaper00031003:24hr_muscle_enriched
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Total muscle enriched genes (complete list of non-overlapping genes from the 0hr and 24hr muscle enriched datasets). |
A two-class unpaired analysis was performed to identify genes that are elevated 1.7-fold or greater when compared with the reference for each dataset, at a false discovery rate of 1.8% or less for M0 and 1.2% or less for the M24 datasets. |
WBPaper00031003:total_muscle_enriched
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Bacteria infection: Serratia marcesens |
Genes down-regulated in animals infected with Serratia marcesens compared to the E. coli OP50 control after 24h of infection. |
MAANOVA and BRB-Array-Tools. |
WBPaper00030985:Serratia_marcesens_downregulated
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Genes that showed significantly changed expression during aging (ANOVA, p < 0.0001) |
ANOVA, p < 0.0001. |
WBPaper00032062:age_regulated_genes
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A complete list of the genes that showed differential expression in a slr-2 mutant strain. |
P-values were calculated using either t-tests or chi-square tests, where appropriate, using the statistic language R. Pearson correlation coefficients between lin-35 and slr-2 coregulated genes as well as standard errors of mean (or deviation) for all other experiments was calculated using Microsoft Excel. |
WBPaper00031832:slr-2_regulated
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Genes predicted to be upregulated more than 2.0 fold in rrf-2(ok210) mutant worms as compared to wild-type animals (t-test P-value < 0.05). |
A t-test (5% confidence) was applied to the triplicate sample data for each transcript in each mutant to identify genes significantly elevated or decreased compared with the wild type. |
WBPaper00027111:rrf-2(ok210)_upregulated
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948 reproductively enriched mRNAs that co-immunoprecipitate with GLD-1. To identify GLD-1 mRNA targets, authors performed immunoprecipitation (IP) of GLD-1, followed by microarray analysis of the co-IPed mRNAs (RIP-chip). Extracts from young adult transgenic worms expressing a rescuing FLAG and GFP-tagged GLD-1, hereafter referred to as tagged GLD-1, were subjected to IP in triplicate with anti-FLAG (aFLAG IP) or anti-MYC (aMYC IP) antibodies as controls. Comparison of aFLAG IP versus aMYC IP to input revealed a large population of GLD-1-associated transcripts. Authors additionally performed complementary aFLAG IPs upon worms expressing either tagged GLD-1(GGF IP) or non-tagged GLD-1(N2 IP). Comparing transcript 'IP-enrichment values' from both approaches revealed a correlation of 0.96, which indicated high reproducibility of GLD-1 association with specific mRNAs even on a quantitative level. |
Authors calculated the mean IP enrichment from the two analyses and given a cutoff of three-fold, they identified 948 reproducibly enriched mRNAs (14.2%) from of a total of 6635 detected by the array. |
WBPaper00037901:GLD-1_mRNA_targets
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Transcripts that showed significantly altered expression after 24 hour exposure to nitrotriazolone (NTO). |
Multivariate permutation tests with random variance model implemented in BRB-Array Tools version 4.5 were performed to infer differentially expressed genes (DEGs). One thousand random permutations were computed per chemical class (i.e., a group of 16 arrays or samples). The confidence level of false discovery rate assessment was set at 80%, and the maximum allowed portion of false-positive genes was 10%. |
WBPaper00055899:nitrotriazolone_regulated
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Genes enriched in body wall muscle AIN-2 miRISCs. Pmyo-3-ain-2-gfp IP was performed in mixed stage worms. |
Enrichment values are expressed as mean percent rank. The p value was computed by comparing all enrichment values for a given transcript to all enrichment values of all transcripts by a one-tailed t test. Significantly enriched genes are those with p value < 0.01. |
WBPaper00040985:AIN-2_asynchronous_muscle
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C-lineage related expression profile. |
QT clustering |
WBPaper00025032:cluster_168
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