planet is an R package for inferring ethnicity (1), gestational age (2), and cell composition (3) from placental DNA methylation data.
See full documentation at https://victor.rbind.io/planet
Installation
Latest Bioconductor release
if(!requireNamespace("BiocManager", quietly = TRUE))
install.packages("BiocManager")
BiocManager::install("planet")Or the development version of planet:
devtools::install_github('wvictor14/planet')Usage
See vignettes for more detailed usage.
Example Data
All functions in this package take as input DNAm data the 450k and EPIC DNAm microarray. For best performance I suggest providing unfiltered data normalized with noob and BMIQ. A processed example dataset, plBetas, is provided to show the format that this data should be in. The output of all planet functions is a data.frame.
A quick example of each major function is illustrated with this example data:
Predict Ethnicity
predictEthnicity(plBetas) %>%
head()
#> 1860 of 1860 predictors present.
#> # A tibble: 6 × 7
#> Sample_ID Predicted_ethnicity_n…¹ Predicted_ethnicity Prob_African Prob_Asian
#> <chr> <chr> <chr> <dbl> <dbl>
#> 1 GSM1944936 Caucasian Caucasian 0.00331 0.0164
#> 2 GSM1944939 Caucasian Caucasian 0.000772 0.000514
#> 3 GSM1944942 Caucasian Caucasian 0.000806 0.000699
#> 4 GSM1944944 Caucasian Caucasian 0.000883 0.000792
#> 5 GSM1944946 Caucasian Caucasian 0.000885 0.00130
#> 6 GSM1944948 Caucasian Caucasian 0.000852 0.000973
#> # ℹ abbreviated name: ¹Predicted_ethnicity_nothresh
#> # ℹ 2 more variables: Prob_Caucasian <dbl>, Highest_Prob <dbl>Predict Gestational Age
There are 3 gestational age clocks for placental DNA methylation data from Lee Y. et al. 2019 (2). To use a specific one, we can use the type argument in predictAge:
predictAge(plBetas, type = 'RPC') %>%
head()
#> 558 of 558 predictors present.
#> [1] 38.46528 33.09680 34.32520 35.50937 37.63910 36.77051Predict Cell Composition
Reference data to infer cell composition on placental villi DNAm samples (3) can be used with cell deconvolution from minfi or EpiDISH. These are provided in this package as plCellCpGsThird and plCellCpGsFirst for third trimester (term) and first trimester samples, respectively.
data('plCellCpGsThird')
minfi:::projectCellType(
# subset your data to cell cpgs
plBetas[rownames(plCellCpGsThird),],
# input the reference cpg matrix
plCellCpGsThird,
lessThanOne = FALSE) %>%
head()
#> Trophoblasts Stromal Hofbauer Endothelial nRBC
#> GSM1944936 0.1091279 0.04891919 0.000000e+00 0.08983998 0.05294062
#> GSM1944939 0.2299918 0.00000000 -1.806592e-19 0.07888007 0.03374149
#> GSM1944942 0.1934287 0.03483540 0.000000e+00 0.09260353 0.02929310
#> GSM1944944 0.2239896 0.06249135 1.608645e-03 0.11040693 0.04447951
#> GSM1944946 0.1894152 0.07935955 0.000000e+00 0.10587439 0.05407587
#> GSM1944948 0.2045124 0.07657717 0.000000e+00 0.09871149 0.02269798
#> Syncytiotrophoblast
#> GSM1944936 0.6979477
#> GSM1944939 0.6377822
#> GSM1944942 0.6350506
#> GSM1944944 0.5467642
#> GSM1944946 0.6022329
#> GSM1944948 0.6085825
