Chapter 8 Differential Analysis
Loading packages
There are more than 10 approaches to perform differential analysis. Here, we choose two of them and recommend users going to XMAS2: Chapter 11 to see more details.
8.1 Filtering and trimming
We suggest that filtering taxa with low abundance (the summarized value under cutoff: 10
) and trimming taxa with low prevalence (default: 0.1
).
8.1.1 Filtering the low relative abundance or unclassified taxa by the threshold (total counts < 10)
dada2_ps_rare_genus_filter <- run_filter(ps = dada2_ps_rare_genus,
cutoff = 10,
unclass = TRUE)
dada2_ps_rare_genus_filter
## phyloseq-class experiment-level object
## otu_table() OTU Table: [ 98 taxa and 23 samples ]
## sample_data() Sample Data: [ 23 samples by 1 sample variables ]
## tax_table() Taxonomy Table: [ 98 taxa by 6 taxonomic ranks ]
8.1.2 Trimming the taxa with low occurrence less than threshold
dada2_ps_rare_genus_filter_trim <- run_trim(object = dada2_ps_rare_genus_filter,
cutoff = 0.1,
trim = "feature")
dada2_ps_rare_genus_filter_trim
## phyloseq-class experiment-level object
## otu_table() OTU Table: [ 92 taxa and 23 samples ]
## sample_data() Sample Data: [ 23 samples by 1 sample variables ]
## tax_table() Taxonomy Table: [ 92 taxa by 6 taxonomic ranks ]
Finally, we obtained the final phyloseq-class object dada2_ps_rare_genus_filter_trim and changed its name.
8.2 Liner discriminant analysis (LDA) effect size (LEfSe)
- Calculation
# dada2_ps_lefse <- run_lefse(
# ps = dada2_ps_rare_genus_filter_trim,
# group = "Group",
# group_names = c("AA", "BB"),
# norm = "CPM",
# Lda = 2)
dada2_ps_lefse <- run_lefse2(
ps = dada2_ps_rare_genus_filter_trim,
group = "Group",
group_names = c("AA", "BB"),
norm = "CPM",
lda_cutoff = 2)
head(dada2_ps_lefse)
## TaxaID Block LDA_Score Enrichment EffectSize Pvalue Log2FoldChange (Median)\nAA_vs_BB
## 1 g__Clostridium_sensu_stricto_1 9_AA vs 14_BB 3.967381 BB 2.596037 0.005225385 NA
## 2 g__Intestinibacter 9_AA vs 14_BB 3.385643 BB 2.283123 0.007746971 NA
## 3 g__Lactobacillus 9_AA vs 14_BB 4.528821 BB 2.416124 0.037446557 -3.318536
## 4 g__Odoribacter 9_AA vs 14_BB -2.950333 AA 1.877093 0.023290211 NA
## 5 g__Parasutterella 9_AA vs 14_BB -3.958031 AA 2.141987 0.036513630 4.398011
## 6 g__Romboutsia 9_AA vs 14_BB 4.008934 BB 2.884128 0.007839137 -6.858931
## Median Abundance\n(All) Median Abundance\nAA Median Abundance\nBB Log2FoldChange (Mean)\nAA_vs_BB Mean Abundance\n(All) Mean Abundance\nAA
## 1 225.34519 0.00000 990.10208 -4.839273 5568.8285 312.5736
## 2 380.30044 0.00000 1214.26808 -2.078056 1787.0215 603.4285
## 3 1284.37748 511.96723 5107.65075 -5.210547 19433.7918 847.5224
## 4 20.27287 604.56881 0.00000 2.135328 560.2715 1057.4092
## 5 152.93526 1079.58717 51.20642 4.383551 3635.2690 8645.7991
## 6 2191.99410 50.38418 5848.41288 -3.319358 6955.2476 1075.4273
## Mean Abundance\nBB Occurrence (100%)\n(All) Occurrence (100%)\nAA Occurrence (100%)\nBB Odds Ratio (95% CI)
## 1 8947.8495 60.87 22.22 85.71 6500 (6600;6500)
## 2 2547.9028 60.87 22.22 85.71 3.7 (6.3;1.1)
## 3 31382.1079 86.96 77.78 92.86 3.4e+08 (3.4e+08;3.4e+08)
## 4 240.6829 52.17 77.78 35.71 0.3 (-2;2.6)
## 5 414.2140 65.22 88.89 50.00 0.005 (-10;10)
## 6 10735.1321 78.26 55.56 92.86 63 (71;55)
- Visualization
# # don't run this code when you do lefse in reality
# dada2_ps_lefse$LDA_Score <- dada2_ps_lefse$LDA_Score * 1000
plot_lefse(
da_res = dada2_ps_lefse,
x_index = "LDA_Score",
x_index_cutoff = 2,
group_color = c("green", "red"))
8.3 Wilcoxon Rank-Sum test
- Calculation
dada2_ps_wilcox <- run_wilcox(
ps = dada2_ps_rare_genus_filter_trim,
group = "Group",
group_names = c("AA", "BB"))
head(dada2_ps_wilcox)
## TaxaID Block Enrichment EffectSize Statistic Pvalue AdjustedPvalue Log2FoldChange (Median)\nAA_vs_BB
## 1 g__Acidaminococcus 9_AA vs 14_BB Nonsignif 70.56349 63.5 1.0000000 1.0000000 NA
## 2 g__Actinomyces 9_AA vs 14_BB Nonsignif 39.65079 44.5 0.2556616 0.7092342 -0.9577718
## 3 g__Adlercreutzia 9_AA vs 14_BB Nonsignif 23.17460 44.0 0.1980169 0.7092342 NA
## 4 g__Agathobacter 9_AA vs 14_BB Nonsignif 1222.58730 71.0 0.6293971 0.9191196 0.1524904
## 5 g__Akkermansia 9_AA vs 14_BB Nonsignif 104.78571 64.5 0.9304707 0.9839460 NA
## 6 g__Alistipes 9_AA vs 14_BB Nonsignif 23.03175 67.0 0.8239942 0.9475933 -0.1085245
## Median Abundance\n(All) Median Abundance\nAA Median Abundance\nBB Log2FoldChange (Rank)\nAA_vs_BB Mean Rank Abundance\nAA
## 1 0 0 0.0 0.01201252 12.06
## 2 30 26 50.5 -0.42227633 9.94
## 3 0 0 9.0 -0.43387758 9.89
## 4 316 329 296.0 0.17342686 12.89
## 5 0 0 0.0 0.03358045 12.17
## 6 64 64 69.0 0.08724541 12.44
## Mean Rank Abundance\nBB Occurrence (100%)\n(All) Occurrence (100%)\nAA Occurrence (100%)\nBB Odds Ratio (95% CI)
## 1 11.96 21.74 22.22 21.43 0.67 (-0.11;1.5)
## 2 13.32 82.61 88.89 78.57 4.1 (6.8;1.3)
## 3 13.36 43.48 33.33 50.00 8.6 (13;4.3)
## 4 11.43 65.22 55.56 71.43 0.39 (-1.4;2.2)
## 5 11.89 21.74 22.22 21.43 1.5 (2.3;0.71)
## 6 11.71 73.91 77.78 71.43 0.88 (0.64;1.1)
- Volcano
plot_volcano(
da_res = dada2_ps_wilcox,
group_names = c("AA", "BB"),
x_index = "Log2FoldChange (Rank)\nAA_vs_BB",
x_index_cutoff = 0.5,
y_index = "Pvalue",
y_index_cutoff = 0.05,
group_color = c("red", "grey", "blue"),
topN = 5)
8.4 Dominant taxa
Display the significant taxa with selection using boxplot.
plot_topN_boxplot(
ps = dada2_ps_rare_genus_filter_trim,
da_res = dada2_ps_wilcox,
x_index = "Log2FoldChange (Rank)\nAA_vs_BB",
x_index_cutoff = 0.5,
y_index = "Pvalue",
y_index_cutoff = 0.05,
topN = 5,
group = "Group")
8.5 Multiple differential analysis by one function
here, we provide the run_multiple_da
for obtaining the results list from multiple differential analysis methods.
multiple_res <- run_multiple_da(
ps = dada2_ps_rare_genus_filter_trim,
group = "Group",
group_names = c("AA", "BB"),
da_method = c("aldex", "limma_voom", "mbzinb", "omnibus"))
## |------------(25%)----------(50%)----------(75%)----------|
## Start GMPR normalization ...
## Start Winsorization ...
## Perform filtering ...
## --A total of 88 taxa will be tested with a sample size of 23 !
## --Omnibus test is selected!
## --Dispersion is treated as a parameter of interest!
## Start testing ...
## 10 %
## 20 %
## 30 %
## 40 %
## 50 %
## 60 %
## 70 %
## 80 %
## 90 %
## 100%!
## Handle failed taxa using permutation test!
## Permutation test ....
## Completed!
## [1] "aldex" "limma_voom" "mbzinb" "omnibus"
- plot results
plot_multiple_DA(
Multip_DA_res = multiple_res,
x_index_list = c("EffectSize", "logFC", "mean.LFC", "abund.LFC.CompvarBB.est"),
x_index_cutoff = 1,
y_index = "AdjustedPvalue",
y_index_cutoff = 0.5,
cellwidth = 50,
cellheight = 15,
fontsize_number = 15)
8.6 Systematic Information
## ─ Session info ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
## setting value
## version R version 4.1.3 (2022-03-10)
## os macOS Monterey 12.2.1
## system x86_64, darwin17.0
## ui RStudio
## language (EN)
## collate en_US.UTF-8
## ctype en_US.UTF-8
## tz Asia/Shanghai
## date 2023-10-27
## rstudio 2023.09.0+463 Desert Sunflower (desktop)
## pandoc 3.1.1 @ /Applications/RStudio.app/Contents/Resources/app/quarto/bin/tools/ (via rmarkdown)
##
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## processx 3.8.2 2023-06-30 [2] CRAN (R 4.1.3)
## profvis 0.3.8 2023-05-02 [2] CRAN (R 4.1.2)
## promises 1.2.0.1 2021-02-11 [2] CRAN (R 4.1.0)
## protoclust 1.6.4 2022-04-01 [2] CRAN (R 4.1.2)
## proxy 0.4-27 2022-06-09 [2] CRAN (R 4.1.2)
## ps 1.7.5 2023-04-18 [2] CRAN (R 4.1.2)
## pscl 1.5.5.1 2023-05-10 [2] CRAN (R 4.1.2)
## psych 2.3.6 2023-06-21 [2] CRAN (R 4.1.3)
## pulsar 0.3.10 2023-01-26 [2] CRAN (R 4.1.2)
## purrr * 1.0.1 2023-01-10 [2] CRAN (R 4.1.2)
## qgraph 1.9.5 2023-05-16 [2] CRAN (R 4.1.3)
## quadprog 1.5-8 2019-11-20 [2] CRAN (R 4.1.0)
## qvalue 2.26.0 2021-10-26 [2] Bioconductor
## R6 2.5.1 2021-08-19 [2] CRAN (R 4.1.0)
## RAIDA 1.0 2022-03-14 [2] local
## rbibutils 2.2.13 2023-01-13 [2] CRAN (R 4.1.2)
## RColorBrewer * 1.1-3 2022-04-03 [2] CRAN (R 4.1.2)
## Rcpp * 1.0.11 2023-07-06 [1] CRAN (R 4.1.3)
## RcppZiggurat 0.1.6 2020-10-20 [2] CRAN (R 4.1.0)
## RCurl 1.98-1.12 2023-03-27 [2] CRAN (R 4.1.2)
## Rdpack 2.4 2022-07-20 [2] CRAN (R 4.1.2)
## readr * 2.1.4 2023-02-10 [2] CRAN (R 4.1.2)
## readxl * 1.4.3 2023-07-06 [2] CRAN (R 4.1.3)
## remotes 2.4.2 2021-11-30 [2] CRAN (R 4.1.0)
## reshape2 1.4.4 2020-04-09 [2] CRAN (R 4.1.0)
## reticulate 1.30 2023-06-09 [2] CRAN (R 4.1.3)
## Rfast 2.0.8 2023-07-03 [2] CRAN (R 4.1.3)
## rhdf5 2.38.1 2022-03-10 [2] Bioconductor
## rhdf5filters 1.6.0 2021-10-26 [2] Bioconductor
## Rhdf5lib 1.16.0 2021-10-26 [2] Bioconductor
## rlang 1.1.1 2023-04-28 [1] CRAN (R 4.1.2)
## rmarkdown 2.23 2023-07-01 [2] CRAN (R 4.1.3)
## robustbase 0.99-0 2023-06-16 [2] CRAN (R 4.1.3)
## rootSolve 1.8.2.3 2021-09-29 [2] CRAN (R 4.1.0)
## rpart 4.1.19 2022-10-21 [2] CRAN (R 4.1.2)
## RSpectra 0.16-1 2022-04-24 [2] CRAN (R 4.1.2)
## RSQLite 2.3.1 2023-04-03 [2] CRAN (R 4.1.2)
## rstatix 0.7.2 2023-02-01 [2] CRAN (R 4.1.2)
## rstudioapi 0.15.0 2023-07-07 [2] CRAN (R 4.1.3)
## Rtsne 0.16 2022-04-17 [2] CRAN (R 4.1.2)
## RVenn 1.1.0 2019-07-18 [2] CRAN (R 4.1.0)
## rvest 1.0.3 2022-08-19 [2] CRAN (R 4.1.2)
## S4Vectors * 0.32.4 2022-03-29 [2] Bioconductor
## sandwich 3.0-2 2022-06-15 [2] CRAN (R 4.1.2)
## sass 0.4.6 2023-05-03 [2] CRAN (R 4.1.2)
## scales 1.2.1 2022-08-20 [2] CRAN (R 4.1.2)
## scatterplot3d 0.3-44 2023-05-05 [2] CRAN (R 4.1.2)
## sessioninfo 1.2.2 2021-12-06 [2] CRAN (R 4.1.0)
## sf 1.0-7 2022-03-07 [2] CRAN (R 4.1.2)
## shape 1.4.6 2021-05-19 [2] CRAN (R 4.1.0)
## shiny 1.7.4.1 2023-07-06 [2] CRAN (R 4.1.3)
## sjlabelled 1.2.0 2022-04-10 [2] CRAN (R 4.1.2)
## sjmisc 2.8.9 2021-12-03 [2] CRAN (R 4.1.0)
## snow 0.4-4 2021-10-27 [2] CRAN (R 4.1.0)
## SpiecEasi * 1.1.2 2022-07-14 [2] Github (zdk123/SpiecEasi@c463727)
## SPRING 1.0.4 2022-08-03 [2] Github (GraceYoon/SPRING@3d641a4)
## stringi 1.7.12 2023-01-11 [2] CRAN (R 4.1.2)
## stringr 1.5.0 2022-12-02 [2] CRAN (R 4.1.2)
## SummarizedExperiment * 1.24.0 2021-10-26 [2] Bioconductor
## survival 3.5-5 2023-03-12 [2] CRAN (R 4.1.2)
## svglite 2.1.1 2023-01-10 [2] CRAN (R 4.1.2)
## systemfonts 1.0.4 2022-02-11 [2] CRAN (R 4.1.2)
## tensorA 0.36.2 2020-11-19 [2] CRAN (R 4.1.0)
## TH.data 1.1-2 2023-04-17 [2] CRAN (R 4.1.2)
## tibble * 3.2.1 2023-03-20 [2] CRAN (R 4.1.2)
## tidyr * 1.3.0 2023-01-24 [2] CRAN (R 4.1.2)
## tidyselect 1.2.0 2022-10-10 [2] CRAN (R 4.1.2)
## timechange 0.2.0 2023-01-11 [2] CRAN (R 4.1.2)
## truncnorm 1.0-9 2023-03-20 [2] CRAN (R 4.1.2)
## tzdb 0.4.0 2023-05-12 [2] CRAN (R 4.1.3)
## umap 0.2.10.0 2023-02-01 [2] CRAN (R 4.1.2)
## units 0.8-2 2023-04-27 [2] CRAN (R 4.1.2)
## urlchecker 1.0.1 2021-11-30 [2] CRAN (R 4.1.0)
## usethis * 2.2.2 2023-07-06 [2] CRAN (R 4.1.3)
## utf8 1.2.3 2023-01-31 [2] CRAN (R 4.1.2)
## uuid 1.1-0 2022-04-19 [2] CRAN (R 4.1.2)
## vctrs 0.6.3 2023-06-14 [1] CRAN (R 4.1.3)
## vegan * 2.6-4 2022-10-11 [2] CRAN (R 4.1.2)
## VennDiagram * 1.7.3 2022-04-12 [2] CRAN (R 4.1.2)
## VGAM 1.1-8 2023-03-09 [2] CRAN (R 4.1.2)
## viridis * 0.6.3 2023-05-03 [2] CRAN (R 4.1.2)
## viridisLite * 0.4.2 2023-05-02 [2] CRAN (R 4.1.2)
## vroom 1.6.3 2023-04-28 [2] CRAN (R 4.1.2)
## webshot 0.5.5 2023-06-26 [2] CRAN (R 4.1.3)
## WGCNA 1.72-1 2023-01-18 [2] CRAN (R 4.1.2)
## withr 2.5.0 2022-03-03 [2] CRAN (R 4.1.2)
## Wrench 1.12.0 2021-10-26 [2] Bioconductor
## xfun 0.40 2023-08-09 [1] CRAN (R 4.1.3)
## XMAS2 * 2.2.0 2023-10-27 [1] local
## XML 3.99-0.14 2023-03-19 [2] CRAN (R 4.1.2)
## xml2 1.3.5 2023-07-06 [2] CRAN (R 4.1.3)
## xtable 1.8-4 2019-04-21 [2] CRAN (R 4.1.0)
## XVector 0.34.0 2021-10-26 [2] Bioconductor
## yaml 2.3.7 2023-01-23 [2] CRAN (R 4.1.2)
## zCompositions 1.4.0-1 2022-03-26 [2] CRAN (R 4.1.2)
## zlibbioc 1.40.0 2021-10-26 [2] Bioconductor
## zoo 1.8-12 2023-04-13 [2] CRAN (R 4.1.2)
##
## [1] /Users/zouhua/Library/R/x86_64/4.1/library
## [2] /Library/Frameworks/R.framework/Versions/4.1/Resources/library
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