readDiaNNPeptides {wrProteo}

Read Tabulated Files Exported by DiaNN At Peptide Level

Description

This function allows importing peptide identification and quantification results from DiaNN. Data should be exported as tabulated text (tsv) to allow import by thus function. Quantification data and other relevant information will be extracted similar like the other import-functions from this package. The final output is a list containing as (main) elements: $annot, $raw and $quant, or a data.frame with the quantication data and a part of the annotation if argument separateAnnot=FALSE.

Usage

readDiaNNPeptides(
  fileName,
  path = NULL,
  normalizeMeth = "median",
  sampleNames = NULL,
  read0asNA = TRUE,
  quantCol = "\\.raw$",
  annotCol = NULL,
  refLi = NULL,
  separateAnnot = TRUE,
  FDRCol = NULL,
  groupPref = list(lowNumberOfGroups = TRUE),
  plotGraph = TRUE,
  titGraph = "DiaNN",
  wex = 1.6,
  specPref = c(conta = "CON_|LYSC_CHICK", mainSpecies = "OS=Homo sapiens"),
  gr = NULL,
  sdrf = NULL,
  suplAnnotFile = FALSE,
  silent = FALSE,
  debug = FALSE,
  callFrom = NULL
)

Arguments

fileName

(character) name of file to be read

path

(character) path of file to be read

normalizeMeth

(character) normalization method, defaults to median, for more details see normalizeThis)

sampleNames

(character) custom column-names for quantification data; this argument has priority over suplAnnotFile

read0asNA

(logical) decide if initial quntifications at 0 should be transformed to NA (thus avoid -Inf in log2 results)

quantCol

(character or integer) exact col-names, or if length=1 content of quantCol will be used as pattern to search among column-names for $quant using grep

annotCol

(character) column names to be read/extracted for the annotation section (default c("Accession","Description","Gene","Contaminant","Sum.PEP.Score","Coverage....","X..Peptides","X..PSMs","X..Unique.Peptides", "X..AAs","MW..kDa.") )

refLi

(character or integer) custom specify which line of data is main species, if character (eg 'mainSpe'), the column 'SpecType' in $annot will be searched for exact match of the (single) term given

separateAnnot

(logical) if TRUE output will be organized as list with $annot, $abund for initial/raw abundance values and $quant with final log2 (normalized) quantitations

FDRCol

(list) - not used

groupPref

(list) additional parameters for interpreting meta-data to identify structure of groups (replicates), will be passed to readSampleMetaData. May contain lowNumberOfGroups=FALSE for automatically choosing a rather elevated number of groups if possible (defaults to low number of groups, ie higher number of samples per group)

plotGraph

(logical or integer) optional plot of type vioplot of initial and normalized data (using normalizeMeth); if integer, it will be passed to layout when plotting

titGraph

(character) custom title to plot of distribution of quantitation values

wex

(integer) relative expansion factor of the violin-plot (will be passed to vioplotW)

specPref

(character or list) define characteristic text for recognizing (main) groups of species (1st for comtaminants - will be marked as 'conta', 2nd for main species- marked as 'mainSpe', and optional following ones for supplemental tags/species - maked as 'species2','species3',...); if list and list-element has multiple values they will be used for exact matching of accessions (ie 2nd of argument annotCol)

gr

(character or factor) custom defined pattern of replicate association, will override final grouping of replicates from sdrf and/or suplAnnotFile (if provided)

sdrf

(character, list or data.frame) optional extraction and adding of experimenal meta-data: if character, this may be the ID at ProteomeExchange, the second element may give futher indicatations for automatic organization of groups of replicates. Besides, the output from readSdrf or a list from defineSamples may be provided; if gr is provided, gr gets priority for grouping of replicates

suplAnnotFile

(logical or character) optional reading of supplemental files; however, if gr is provided, gr gets priority for grouping of replicates; if character the respective file-name (relative or absolute path)

silent

(logical) suppress messages

debug

(logical) additional messages for debugging

callFrom

(character) allow easier tracking of messages produced

Details

This function has been developed using DiaNN version 1.8.x.

Using the argument suplAnnotFile it is possible to specify a specific file (or search for default file) to read for extracting file-names as sample-names and other experiment related information.

Value

This function returns a list with $raw (initial/raw abundance values), $quant with final normalized quantitations, $annot, $counts an array with number of peptides, $quantNotes and $notes; or if separateAnnot=FALSE the function returns a data.frame with annotation and quantitation only

See Also

read.table, normalizeThis) , readMaxQuantFile, readProtDiscovFile, readProlineFile

Examples

diaNNFi1 <- "tinyDiaNN1.tsv.gz"
## This file contains much less identifications than one may usually obtain
path1 <- system.file("extdata", package="wrProteo")
## let's define the main species and allow tagging some contaminants
specPref1 <- c(conta="conta|CON_|LYSC_CHICK", mainSpecies="HUMAN")
dataNN <- readDiaNNFile(path1, file=diaNNFi1, specPref=specPref1, tit="Tiny DIA-NN Data")
summary(dataNN$quant)