Effects of filtering by Present call on analysis of microarray experiments.
paper
Cited
Public
- Authors
- McClintick, Jeanette N; Edenberg, Howard J
- Year
- 2006
- Journal
- BMC bioinformatics
- PMID
- 16448562
- DOI
- 10.1186/1471-2105-7-49
- PMCID
- PMC1409797
BACKGROUND: Affymetrix GeneChips are widely used for expression profiling of tens of thousands of genes. The large number of comparisons can lead to false positives. Various methods have been used to reduce false positives, but they have rarely been compared or quantitatively evaluated. Here we describe and evaluate a simple method that uses the detection (Present/Absent) call generated by the Affymetrix microarray suite version 5 software (MAS5) to remove data that is not reliably detected before further analysis, and compare this with filtering by expression level. We explore the effects of various thresholds for removing data in experiments of different size (from 3 to 10 arrays per treatment), as well as their relative power to detect significant differences in expression. RESULTS: Our approach sets a threshold for the fraction of arrays called Present in at least one treatment group. This method removes a large percentage of probe sets called Absent before carrying out the comparisons, while retaining most of the probe sets called Present. It preferentially retains the more significant probe sets (p < or = 0.001) and those probe sets that are turned on or off, and improves the false discovery rate. Permutations to estimate false positives indicate that probe sets removed by the filter contribute a disproportionate number of false positives. Filtering by fraction Present is effective when applied to data generated either by the MAS5 algorithm or by other probe-level algorithms, for example RMA (robust multichip average). Experiment size greatly affects the ability to reproducibly detect significant differences, and also impacts the effect of filtering; smaller experiments (3-5 samples per treatment group) benefit from more restrictive filtering (> or =50% Present). CONCLUSION: Use of a threshold fraction of Present detection calls (derived by MAS5) provided a simple method that effectively eliminated from analysis probe sets that are unlikely to be reliable while preserving the most significant probe sets and those turned on or off; it thereby increased the ratio of true positives to false positives.
Distribution of MAS5 log2(signals) before and after filtering. A) No filter. B) Filtering with threshold of ≥ 50% Present in at least one treatment group. C) Filtering by average signal with threshold at ≥475 in at least one treatment group. The number of probe-sets at each value of Log2(signal) are plotted. Black = Present, gray = Marginal, white = Absent.
Distribution of RMA values before and after filtering. A) No filter. B) Filtering with threshold of ≥ 50% Present in at least one treatment group. C) Filtering by average RMA value with threshold at ≥5.03 in at least one treatment group. Symbols as in Fig. 1.
Percent of probe sets remaining after filtering. Percent of probe sets remaining after filtering using selected thresholds for A) Fraction Present. B) MAS5 Signal. C) RMA value.
Number of significant probe sets after filtering. A) Filtering by fraction Present vs. by average MAS5 signal. The probe sets called significantly different (at the p-values shown) between the interferon treated and untreated samples in the 10 sample experiment are plotted against the threshold of Fraction Present (FP) or average signal (S), followed by threshold value. The horizontal line at 1230 indicates the number of probe sets at p ≤ 0.001 in the unfiltered data. Paired thresholds remove comparable numbers of probe sets, e.g. FP>0 and S254. B) Filtering by fraction Present vs. by average RMA value. (FP) Fraction Present, (R) average RMA value, followed by threshold value. The line at 1641 indicates the number of probe sets at p ≤ 0.001 in the unfiltered data.
Effect of Filtering on false discovery rate (FDR). Filter method and values (x-axis): Fraction Present (FP), signal (S) or RMA value (R) followed by threshold value; separate lines are shown for each. Closed circles represent values from fraction Present filtering, open diamonds from average signal or average RMA. P-values: 0.05 (blue), 0.01 (pink), and 0.001 (green). A) IFN data, MAS5, B) IFN data, RMA, C) Smoking data, MAS5. Note that the smoking data was scaled to 100 instead of 1000 used for the other data sets.
Effect of filtering on average number of significant probe sets in smaller experiments. Smaller virtual experiments (4, 6 and 8 samples per treatment group) were created by random selection of arrays within each of the two treatment groups (based on 1000 permutations). The probe sets called significantly different (at the p-values shown) are shown for different values of fraction Present (x-axis). Note differences in scale for y-axes of the 3 graphs. P-values: ≤ 0.05 diamond, ≤0.01 square, ≤0.001 triangle.
Effects of filtering on FDR in smaller experiments. FDR for the smaller virtual experiments shown in Fig. 6. Note differences in scale for y-axes of the 3 graphs. P-values: ≤ 0.05 diamond, ≤0.01 square, ≤0.001 triangle.
Effect of experiment size on true positives, false positives and consistent positives. TP: true positive, p-value ≤ 0.05 in smaller simulated experiment and p ≤ 0.05 in full 10-sample analysis. FP: false positive, p-value ≤ 0.05 in smaller simulated experiment but p > 0.05 in full 10-sample analysis. 500/1000: consistent positives, found significant at p < -0.05 in at least 50% of the 1000 permutations. Data are shown both unfiltered and after filtering by 50% Present.
Effect of experimental size on number of probe sets meeting a fixed value of FDR before and after filtering. The number of probe sets meeting various Benjamini and Hochberg FDR thresholds, 0.2 (blue), 0.1 (red), and 0.05 (green) before (open symbols) and after filtering (filled symbols) by 50% Present. Number selected is average over 1000 permutations.
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