LC-MS. Pre-processing (xcms) W4M Core Team. 22/09/2015 v 1.0.0
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1 LC-MS Pre-processing (xcms) W4M Core Team 22/09/2015 v 1.0.0
2 Acquisition files pre-processing with xcms: extraction, alignment and retention time drift correction. SECTION 1 2
3 Extraction with XCMS R based software, Free A lot of parameters to tune, No graphical interface Need to write a R script xcmsonline webservice web: forums :
4 LC-MS Data What is provided by the LC-MS devices What we want for data analysis
5 Extraction with XCMS Extraction Extraction of ions in each sample independantly. Baseline correction Creation of extracted ion chromotograms ( EIC ) Grouping alignment Each ion is aligned across all samples CAMERA Annotation of Adduct Fragments and isotopes Retention time correction (optional) On the basis of «well behave» peaks, a LOESS (non linear) regression is used to correct the retention time of each ion in order to improve the alignment. Useful for HPLC, less usefull for UPLC Fill peaks Replace missing data with baseline value Statistics and visualisation (optionals) CAMERA For annotation of adducts, fragments and isotopes
6 Extraction with XCMS CAMERA Annotation of Adduct Fragments and isotopes
7 xcms Extraction algorithms MatchedFilter is dedicated to centroid or profile low resolution MS data Centwave is dedicated to centroid high resolution MS data 7
8 CAMERA Annotation of Adduct Fragments and isotopes xcmsset parameters
9 CAMERA Annotation of Adduct Fragments and isotopes xcmsset parameters
10 xcms extraction matchfilter algorithm extraction of ions in each sample independantly. Creation of extracted ion base peak chromotograms (EIBPC) Model and filter with a second derivative gaussian model Intensity is a peak integration or peak height Smith C., Anal. Chem., 2006
11 xcms extraction matchfilter algorithm extraction of ions in each sample independently. Baseline correction Creation of extracted ion chromatograms ( Matchfilter) step parameter fwhm parameter steps parameter Smith C., Anal. Chem., 2006
12 xcms extraction matchfilter algorithm Influence of parameter (fwhm, full width at half maximum) on extract ion chromatogram (EIC) Tautenhahn, BioInformatics, 2008
13 xcms extraction matchfilter algorithm Influence of parameter (fwhm, full width at half maximum) on extract ion chromatogram (EIC) Tautenhahn, BioInformatics, 2008
14 xcms Extraction centwave algorithm As for matchfilter, the extraction of ions is made in each sample independently. "Mass traces" or region of interest (ROI) with m/z deviation in consecutive scans less than a define value are located. Then, chromatographic peak are detected. 2 main parameters has to be set : -ppm according to mass accuracy -peakwidth acording to the chromatographic peak width range.
15 xcms centwave parameters CAMERA Annotation of Adduct Fragments and isotopes
16 xcms centwave parameters CAMERA Annotation of Adduct Fragments and isotopes
17 xcms Extraction centwave algorithm Centwave chromatographic peaks detection (same example as metachedfilter). Tautenhahn, BioInformatics, 2008
18 xcms Extraction centwave algorithm Centwave chromatographic peaks detection (same example as metachedfilter). Tautenhahn, BioInformatics, 2008
19 xcms centwave parameters xcms forum : How to choose peakwidth? "The main purpose of the peakwidth parameter is to roughly estimate the peak width range, this parameter is not a threshold. The wavelets used for peak detection are calculated from this parameter. If you use HPLC and your peaks are normally s wide (base peak with), just go with that, i.e. peakwidth=c(20,60) centwave will still detect peaks that are 15s or 80 s wide! Important: Do not choose the minimum peak width too small, it will not increase sensitivity, but cause peaks to be split." Example: peak width ~ 45 s Using peakwidth = c(20,60) the peak will be split in three peaks, each detected as a ~10s wide separate peak (since they are separated by a local minimum) : using peakwidth = c(20,120) will keep the peak intact :
20 Centwave parameters effect on extraction Nb. of extracted peaks Nb. of extracted groups (ions) duplicate groups (same nominal m/z with RT +/30sec) significant groups (Qcpools vs Blanks) 20
21 Centwave parameters effect on extraction Nb. of extracted peaks Nb. of extracted groups (ions) duplicate groups (same nominal m/z with RT +/30sec) significant groups (Qcpools vs Blanks) 21
22 Centwave mzdiff effect on extraction Nb. of extracted peaks Nb. of extracted groups (ions) duplicate groups (same nominal m/z with RT +/30sec) significant groups (QCpools vs Blanks) 22
23 xcms extraction output CAMERA Annotation of Adduct Fragments and isotopes samplemetadata.tsv is initialized at this step. It must contain all informations needed for further analyses: batch correction and statistical analyses. This file must be downloaded in order to add all these informations and then uploaded.
24 CAMERA Annotation of Adduct Fragments and isotopes xcms extraction output
25 CAMERA Annotation of Adduct Fragments and isotopes group parameters
26 xcms alignment group Peak density chromatogram width determines the number of peaks that are included in the same group. The parameter used correspond to the standard deviation of the peak density chromatogram. This parameter can be interpreted as a retention time window. The other parameter corresponds to the mass window : mzwid mzwid bw = 30 sec bw = 10 sec
27 xcms group output mzwid define the intervals of m/z CAMERA Annotation of Adduct Fragments and isotopes bw define the width of the gaussian curve
28 Two distinct m/z merge as one group. Mzwid and bw too large xcms group output
29 Two distinct m/z merge as one group. Mzwid and bw too large xcms group output
30 group parameters effect on extraction Nb. of extracted groups (ions) duplicate groups(same nominal mz with RT +/30sec) significant groups (QCpools vs Blanks) 30
31 Example of xcms parameters Instrument p.p.m. Peak width bw mzwid Prefilter HPLC/Q-TOF 30 c(10,60) c(0,0) HPLC/Q-TOF (high resolution) 15 c(10,60) c(0,0) HPLC/Orbitrap 2.5 c(10,60) c(3,5000) Ultraperformance liquid chromatography (UPLC)/Q-TOF 30 c(5,20) c(0,0) UPLC/Q-TOF (high resolution) 15 c(5,20) c(0,0) UPLC/Orbitrap 2.5 c(5,20) c(3,5000)
32 CAMERA Annotation of Adduct Fragments and isotopes xcms workflow retcor
33 xcms retcor output CAMERA Annotation of Adduct Fragments and isotopes retcor improving retention time must be followed by a second group step.
34 xcms fillpeaks Filling method: «chrom» for LCMS «MSW» for direct infusion. CAMERA Annotation of Adduct Fragments and isotopes
35 CAMERA Annotation of Adduct Fragments and isotopes xcms fillpeaks
36 MS data processing Report creation and Annotations Yann GUITTON 22/09/2015 v 1.0.0
37 xcms diffreport & CAMERA CAMERA an other R package integrated in Galaxy The R-package CAMERA is a Collection of Algorithms for MEtabolite profile Annotation. Its primary purpose is the annotation and evaluation of LC-MS data. It includes algorithms for annotation of isotope peaks, adducts and fragments in peak lists. Additional methods cluster mass signals that originate from a single metabolite, based on rules for mass differences and peak shape comparison CAMERA Annotation of Adduct Fragments and isotopes
38 xcms diffreport & CAMERA M x T y CAMERA.annotate= CAMERA::annotateDiffreport In details: 1- xcms::diffreport : Generates features list, EICs, BoxPlot and statistics 38
39 Intensity xcms diffreport & CAMERA CAMERA.annotate= CAMERA::annotateDiffreport In details: 1- xcms::diffreport : Generates features list, EICs, BoxPlot and statistics EICs Boxplots m/z =M x m/z 39
40 Relative Abundance Intensity Relative Abundance xcms diffreport & CAMERA CAMERA.annotate= CAMERA::annotateDiffreport In LC-MS ESI Features are usally not alone Number of features is not equal to number of detected molecules RT: Search in raw data m [ M m/z =M x Time (min) VB-2J-F-3 #828 RT: AV: 1 NL: 1.15E6 F: FTMS + c ESI Full ms [ ] m/z C13 isotopes m/z 40
41 xcms diffreport & CAMERA CAMERA.annotate= CAMERA::annotateDiffreport In details: 2- CAMERA::xsAnnotate: read xcms object 3- CAMERA::groupFWHM: search co-eluting features RT based 4- CAMERA::findIsotopes: search for isotopic realtion between features (C 12 /C 13 ) 5- CAMERA::groupCorr : try to improve co-elution separation 6- CAMERA::findAdduct: search for known adducts and fragments [M+Na] +, [M+H-H 2 O] +,. [M+H] [M+H+NH3] [M+Na] [M+K] [M+NH4+ACN] [2M+Na] [2M+K] Non annotated, but low intensity 41
42 xcms diffreport & CAMERA zoom CAMERA adduct annotation: defining rules [M+H-NH 3 ] + [M+H-NH 3 -H 2 O] +? Green= Annotation OK Red= No annotation or wrong or adduct not in CAMERA 42
43 xcms diffreport & CAMERA CAMERA.annotate= CAMERA::annotateDiffreport In details: 2- CAMERA::xsAnnotate: read xcms object 3- CAMERA::groupFWHM: search co-eluting features RT based 4- CAMERA::findIsotopes: search for isotopic realtion between features (C 12 /C 13 ) 5- CAMERA::groupCorr : try to improve co-elution separation 6- CAMERA::findAdduct: search for known adducts and fragments [M+Na] +, [M+H-H 2 O] +,. Some times. Co-elution are not fully resolved, have a look to your data 43
44 xcms diffreport & CAMERA Additionnal information added to the diffreport by CAMERA M x T y annotations 44
45 xcms diffreport & CAMERA CAMERA.annotate= CAMERA::annotateDiffreport In details: 1- xcms::diffreport : Generates features list, EICs, BoxPlot and statistics 2- CAMERA::xsAnnotate: read xcms object 3- CAMERA::groupFWHM: search co-eluting features RT based 4- CAMERA::findIsotopes: search for isotopic realtion between features (C 12 /C 13 ) 5- CAMERA::groupCorr : try to improve co-elution separation 6- CAMERA::findAdduct: search for known adducts and fragments [M+Na] +, [M+H-H 2 O] +,. Many steps= quite a lot of parameters 45
46 xcms diffreport & CAMERA CAMERA Annotation of Adduct Fragments and isotopes
47 xcms diffreport & CAMERA More parameters CAMERA Annotation of Adduct Fragments and isotopes
48 xcms diffreport & CAMERA : outputs Output files xset.annotate.variablemetadata.tsv For each metabolite (row) : the value of the intensity in each sample, fold, anova, mzmed, mzmin, mzmax, rtmed, rtmin, rtmax, npeaks, isotopes, adduct and pcgroup xset.annotate.datamatrix.tsv A tabular file which represents for each metabolite (row), the value of the intensity in each sample (column). xset.annotate.zip It contains filebase_eic, filebase_box and filebase.tsv for one conditon vs another (Anova analysis). xset.annotate.rdata rdata.camera.quick or rdata.camera.positive or rdata.camera.negative Rdata file, that be used outside Galaxy in R.
49 xcms diffreport & CAMERA : outputs Output files xset.annotate.variablemetadata.tsv For each metabolite (row) : the value of the intensity in each sample, fold, anova, mzmed, mzmin, mzmax, rtmed, rtmin, rtmax, npeaks, isotopes, adduct and pcgroup
50 And next database search!
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