Statistical Analysis Strategies for Shotgun Proteomics Data


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1 Statistical Analysis Strategies for Shotgun Proteomics Data Ming Li, Ph.D. Cancer Biostatistics Center Vanderbilt University Medical Center
2 Ayers Institute Biomarker Pipeline normal shotgun proteome analysis compare inventories, identify differences cancer no vs. targeted quantitative analysis yes Labelfree MRM in tissue Is it really there? Is there a difference? LCMRMMS method or Y Y ELISA vs. evaluate in clinical context sensitivity specificity performance metrics Discovery few(<20) samples or sample pools low throughput identify up to ~5,000 proteins inventory differences ~150 proteins Verification ~ samples higher throughput screen candidates identify high priority candidates Validation hundreds+ of samples highest throughput validate 110 candidates clinical validation trial
3 The Big Picture Proteomics Tools Mass Spectrometry Database Bioinformatics Proteinseparation Techniques Research Goal Biomarker Discovery High Throughput Data (MALDI MS, Shotgun, etc) Challenge on Data Analysis
4 Outline Background Shotgun Proteomics Techniques and Data The Challenges for Statistical Analysis Statistical Analysis Strategies Methods and Models Case Study and Preliminary Results Discussion and Future Work
5 Background on Shotgun Proteomics What is Shotgun Proteomics? A method of identifying proteins in complex mixtures using a certain separation/digestion method combined with mass spectrometry. More specifically, the proteins in the mixture are digested and the resulting peptides are separated (by HPLC, SCX, IEF, etc), tandem mass spectrometry (MS/MS) is then used to identify the peptides (LC MS/MS) and matched back to proteins.
6 General Flow in Proteomic Analysis Proteins SDSPAGE or Prep IEF or HPLC Digest Reverse phase LC Tandem LC Protein Fraction 1 Peptide Fraction 1 data Protein Fraction 2 Peptide Fraction 2 Protein Fraction 3 Peptide Fraction 3 MS/MS Analysis Database search algorithms Protein Fraction n Peptide Fraction n Identification From Liebler, Introduction to Proteomics, 2002.
7 Shotgun 101 Design Analysis Integration Nesvizhskii et al.
8 LC separation MS MSMS fragmentation m/z 2 4 m/z m/z 3 1 m/z m/z
9 dm_200392_tpepc_std #587 RT: AV: 1 NL: 1.95E7 T: + c d Full ms2 [ ] b 2 + H 3 N b 1 b 2 b 3 b 4 b 5 b 6 b 7 b A V A G C A G A R O HN O NH O NH O HS NH O NH O NH O H N + H 3 N NH O N H HN CO 2 H y y 6 Relative Abundance y 8 y 7 y 6 y 5 y 4 y 3 y 2 y 1 y b b 3 b b 6 y y b 7 b m/z y 4 m/z
10 dm_200392_tpepc_std #587 RT: AV: 1 NL: 1.95E7 T: + c d Full ms2 [ ] Relative Abundance m/z Actual MSMS scan Precursor peptide [M+H] + = Get database sequences that match precursor peptide mass AVAGCAGAR CVAAGAAGR VGGACAAAR etc Generate virtual MSMS spectra AVAGCAGAR CVAAGAAGR VGGACAAAR b2 y2b3 y3 b4 y4 b5 y5 b6 y6 b2 y2b3y3 b4 y4 b5 y5 b6 y6 b2 y2 b3 y3 b4 y4 b5 y5 b6 y6 Compare virtual spectra to real spectrum dm_200392_tpepc_std #587 RT: AV: 1 NL: 1.95E7 T: + c d Full ms2 [ ] Scoring Peptide score Relative Abundance m/z  Detect matches between theoretical b and yions and actual spectrum ions  Compute correlation scores  Rank hits AVAGCAGAR 2.56 CVAAGAAGR 0.57 VGGACAAAR 0.32
11 From Shotgun Proteomics to Biomarker Discovery A Protein/Peptide FrequencyBased Analysis Approach Compare spectral identifications between groups; The unit of measurement is the number of times a peptide observed in a single LCMS/MS round of analysis that are matched to the peptide sequences; The counts reflect the abundance of the protein from which these peptides are derived.
12 Shotgun Data and Statistical Challenge Normal Cancer Protein Sample 1 Sample m Sample 1 Sample m # # # # : : : : : : : : #N : : : : : :
13 Statistical Analysis Goal Provide investigators a winner list of proteins for further study; The winners are the potential biomarkers of diagnostics, prognostics or therapeutic; The winners are selected by appropriate statistical models and procedures.
14 Statistical Analysis Strategy Model the Count Data Poisson Regression Model Quasilikelihood Poisson Model (GEE method) Rate Model (Poisson Model with Offset) Handle Small Sample Size Provide Appropriate Test Statistics Permutation Test Deal with Multiple Comparison Issues Frequentist Approach (FDR) Empirical Bayes Approach (LOCFDR)
15 Poisson Model for Count Data Poisson Regression Model (Poisson GLM) Y is Poisson random variable with mean u, then P( Y = y) = E( Y ) = Var( Y ) = u Log link function: log (u)=( )=η= x T β (For our application: log (u)=( )=η= β 0 +(Group) β 1 ) By NewtonRaphson algorithm, get MLE of β and the 95%CI Gstatistic and Pearson s χ 2 statistics e u y u! y μ
16 Graphical Presentation of Poisson Distribution May not be Flexible for Empirical Fitting Purpose. Poisson Distributions: Poisson( λ ) Probability λ=5 λ=10 λ=15 λ= N o te : P o is s o n( λ ) has m ean λ and SD x λ
17 Extend Poisson Model Generalize Poisson Model by Allowing Dispersion Var (Y) = φ E(Y) = φu φ =1 (no dispersion), regular Poisson GLM is appropriate φ >1 (overdispersion) or φ <1 (underdispersion), dispersion), the standard error estimation is not reliable, adjust standard errors by φ. Quasilikelihood Poisson Model A more flexible modeling technique when over/under dispersion occurs in count data No strong idea about the appropriate distributional form of the outcome variable while can specify the link and variance function for the model
18 Under/OverDispersion for Shotgun Data Esitmate Dispersion Density Estimated Dispersion: Dp Ideal Dispersion Distribution: N(1, σ 2 )
19 QuasiLikelihood Poisson Model More details about quasilikelihood, define a score, U i : Then U i = Y i u ϕv( u ) i i EU ( ) = 0; VU ( ) = i i 1 ϕv( u ) ' i ϕ ( i) ( i i) ϕ ( i) 1 E 2 i ϕ i ϕ i U V u Y u V u E = = u [ V( u )] V( u ) i
20 Derive Quasilikelihood These properties are shared by the derivatives of the loglikelihood, likelihood, l, which suggest we can use U in place of l, define: yi t Q = i dt ϕv () t Then define the log quasilikelihood for all n observations as: Q n = i = 1 Q i
21 Generalized Estimation Equation (GEE) Method Quasilikelihood approach can be adapted for repeated measures and/or longitudinal experiment designs for shotgun proteomics research Generalized Estimation Equation (GEE) methods can be used for estimations Mixed effect models for nonnormal normal responses A multivariate analogue of the equations for the quasi likelihood models i T ui 1 ( ) Var( Yi; βα, ) ( Yi ui) = 0 β
22 Rate Model for Normalizing Shotgun Data Why do We Need Rate Model? The number of events observed may depend on a size variable that determines the number of opportunities for the events to occur For example: in some run of LCMS/MS, the sample density might be different; we need normalization before comparison Can be done within Poisson/QuasiPoisson GLM by modeling the effect of the size variable
23 Rate Model for Normalizing Shotgun Data Rate Model Log (u/w)= η = x β Log (u) = log(w)+ x β In this manner, we are modeling the rate of spectral observing while still maintaining the count response for the Poisson/QuasiPoisson model. We fix the coefficient as one by using an offset.
24 Handle Small Sample Size Issues with Small Sample Size: Asymptotic Distribution May not be Hold The χ 2 distribution is only an approximation that becomes more accurate as the sample size increases Not possible to say exactly how large we need, but N 5 N 5 is often suggested Lack of Power if the Effect is not Strong In the real world, due to financial/time constraints, the number of runs for shotgun data is usually small.
25 Sample Size for Poisson Power
26 Handle Small Sample Size Some Solutions Appropriate Test Statistics: D s D L ~ χ 2 ls Model S: Log(u)= )=log( log(w)+ β 0 Model L: log(u)=log( )=log(w)+)+ β 0 +(Group Group) β 1 Permutation Test: Reference distribution is obtained from the data P = {# T _perm > T _obs } / {# total permutation}
27 Statistical Analysis Strategy Model the Count Data Poisson Regression Model Quasilikelihood Poisson Model (GEE method) Rate Model (Poisson Model with Offset) Handle Small Sample Size Provide Appropriate Test Statistics Permutation Test Deal with Multiple Comparison Issues Frequentist Approach (FDR) Empirical Bayes Approach (LOCFDR)
28 Deal with Multiple Comparisons Why Worry About It? Selection Bias: : researchers tend to select significant ones to support their conclusions Inflate the False Positive Rate: : unadjusted Pvalues from the singleinference inference procedure result in increased type I error.
29 Multiple Tests Increase Chance of False Positive Probability of Having At Least One False Positive Probability o + * α = 0.1 ooooooooooooooooooooooooooooooooooooooo α = α = 0.01 o o ooo + o oo o o o + ++ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Number of Tests
30 Deal with Multiple Comparisons Family wise error rate (FWER) methods Too conservative and less application values Not suitable for largescale simultaneous hypothesis testing problems arouse from high through technologies A desirable error rate to control might be the expected proportion of errors among the rejected hypotheses.
31 Approach 1: False Discovery Rate Define the FDR to be the expectation of Q,, and control it under a value q * V V FDR = E( Q) = E( ) = E( ) V + S R True Null hypothesis Nontrue Null hypothesis Declared Declared Nonsignificant Significant U V T S mr R R Total m 0 m m 0 m From Benjamin & Hochberg, Controlling the False Discovery Rate, 1995
32 False Discovery Rate Controlling Procedure Sorted Pvalues q c = 0.1 q c = 0.2 q c =
33 Approach 2: Local False Discovery Rate Define Local FDR Null hypothesis: H 1, H 2,,, H N Test statistic: z 1, z 2,, z N p 0 =Pr{Null} f 0 (z)) density if null p 1 =Pr{nonnull} null} f 1 (z)) density if nonnull null Mixture density: f (z)) = p 0 f 0 (z)+ p 1 f 1 (z) Local FDR: fdr(z)= )=Pr{null z}= p 0 f 0 (z)) /f/ (z) From Efron, Local False Discovery Rates, 2005
34 How to Apply Local False Discovery Rate Histogram of Summary Statistics with Fitted M ixture Density Frequency MLE: delta: sigma: p0: 0.928
35 FDR vs. LOCFDR Frequentist Approach FDR LOCFDR Empirical Bayes method Works on Pvalues P values (null hypothesis tail area) Works on the test statistics Efron: In practice, FDR and LOCFDR can be combined, using BenjaminiHochberg algorithm to identify nonnull null cases, say with q=0.1, but also providing individual LOCFDR values for those cases.
36 Statistical Analysis Strategy Model the Count Data Poisson Regression Model Quasilikelihood Poisson Model Rate Model (Poisson Model with Offset) Handle Small Sample Size Provide Appropriate Test Statistics Permutation Test Deal with Multiple Comparison Issues Frequentist Approach (FDR) Empirical Bayes Approach (LOCFDR)
37 Case Study A Global Shotgun Proteomic Analysis of Colorectal Carcinoma Biological Materials RKO Cell Lines Rectal Adenocarcinoma Specimen Mass Spectrometry Method Peptides Separated by Strong Cation Exchange (SCX) and Isoelectric Focusing (IEF) LTQQrbitrap Qrbitrap Mass Spectrometer (Thermo Electron, San Joase,, CA) Database Searching and Filtering MyriMatch Search Algorithm; IPI Human Database 3.31; IDPicker 2.0
38 Case Study : Data Analysis Preliminary Results Protein.order Protein CAR_Counts RKO_Counts Poisson_Pvalue Quasi_Pvalue Pois_Pvalue_FD R 1513 IPI E E E E IPI E E IPI E E IPI E E E E IPI E E IPI E E E E IPI E E E E IPI E E E E IPI E E E E IPI E E E E IPI E E E E IPI E E E E IPI E E E E IPI E E E E IPI E E E E IPI E E E E IPI E E E E IPI E E E E IPI E E E E07 Quasi_Pvalue_FDR
39 Case Study Data Analysis Preliminary Results
40 Discussion and Future Study A framework Flexible to be Extend Repeat measurement; trend test, and etc. Quality Control of the Data Involve in the early step of data generation process Simulation Study Evaluating the Methods Add the Current Work to the pipeline of the Proteomic Research
41 Acknowledgement Rob Slebos Dan Liebler Pierre Massion Takefumi Kikuchi David Carbone Will Gray Yu Shyr Cancer Biostatistics Center Ayer Institute GI SPORE Lung SPORE
42 Thank You!
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