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filter acts as a PM only filter and if a mismatch adjustment is wanted then the investigator will perform a preliminary analysis and incorporate this information into a modified CDF. Sample Cleansing Sample comparisons are usually performed prior to any data assessment, which can lead to erroneous conclusions about which are the true outliers. We have presented a protocol that proceeds via measurement characteristics to perform batch analyses for technical problems, and follows up with probeset characteristics thereafter to manage biological outliers. The selection of stringency is up to the needs of the investigator: when we relaxed the sample filtering process for the Bhattacharjee adenocarcinoma versus normal samples, an additional 28 samples and approximately 400 probesets were included, but the classification accuracy for the three algorithms suffered (data not shown). Platform Enabled Analysis Flexibility Although not the primary focus of this report, the analysis platform we have used provides great flexibility in selecting particular types of probes for detailed analysis. To produce the top half of Figure 2.2 we selected only cross-hybridizing probes, to highlight how different the response pattern they give is to the highly cleansed probes; to perform this analysis required that we alter a single query. Another experiment identified which genes were considered present in the adenocarcinoma state (minimum of 4 cleansed probes) and not present in the normal state (i.e. a plus/minus analysis rather than relative expression analysis). This analysis identified osteopontin: further investigation has shown that it has been implicated in lung cancer development and patient survival [70-75]. 64
Conclusion We have presented a comprehensive protocol for preparing data for gene expression Microarray analysis, using a suite of probe and measurement based filters, and have shown that by so doing more reliable probe-target measurements result, whose trends are consistent across independent experiments. While individual components of our protocol have been published elsewhere, to our knowledge the methods have not been integrated together and the overall effect assessed. Understanding contributions to a response allows researchers to have more confidence when making cross experiment data comparisons, which will facilitate our understanding of gene behavior within a cell. We do expect that this type of analysis will only be improved with the addition of more sophisticated noise reduction methods applied to data prepared in this manner. Finally, probe based analysis is greatly simplified if carried out with a database system such as ProbeFATE, which uses the probe as the atomic unit and has been optimized for manipulations and aggregations that build specific subsets based on user-coupled criteria. 65
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An Adenocarcinoma Case Study of the
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DEDICATION The work presented in th
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TABLE OF CONTENTS LIST OF TABLES ..
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Conclusion.........................
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LIST OF FIGURES Figure Page Figure
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violate the linear correlation rela
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Chapter 1: An Introduction to Micro
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previously stated, rigorous reagent
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Factors influencing Signal Interpre
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likelihood that no such structural
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hybridization and multiple dye stra
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classical reaction equations, modif
Page 25 and 26: prevent the hybridization of probes
Page 27 and 28: platforms are used to deposit them
Page 29 and 30: and chip layout [64]. In particular
Page 31 and 32: whether analyses based upon individ
Page 33 and 34: The process of determining a candid
Page 35 and 36: implemented in order to demonstrate
Page 37 and 38: affecting probe-target duplex forma
Page 39 and 40: It has long been known that the var
Page 41 and 42: probes can thus be reincorporated i
Page 43 and 44: (Carr, ms in review). This ProbeFAT
Page 45 and 46: have specific attributes which can
Page 47 and 48: elow saturation. The investigator m
Page 49 and 50: a. A filter based on how many probe
Page 51 and 52: means. The remaining sets possess s
Page 53 and 54: for the 24 samples in the Lu, et al
Page 55 and 56: Table 2.1: Probe Numbers per filter
Page 57 and 58: the effect can be. Both the type of
Page 59 and 60: described above. In Figure 2.3, the
Page 61 and 62: various data processing stages are
Page 63 and 64: position of the probe on the transc
Page 65 and 66: Figure 2.5: BaFL consistency. Demon
Page 67 and 68: Figure 2.6: Probe-Transcript region
Page 69 and 70: Table 2.3: ProbeSet behavior predic
Page 71 and 72: cleansing process. This is demonstr
Page 73 and 74: Table 2.4: ProbeSet behavior of pro
Page 75: A Priori Prediction We demonstrated
Page 79 and 80: mind that they are most aware of th
Page 81 and 82: Probe Cleansing Methods The BaFL pr
Page 83 and 84: are significant assume such a data
Page 85 and 86: cleansing process and were assessed
Page 87 and 88: sample selection, with replacement,
Page 89 and 90: Figure 3.1: P value distributions.
Page 91 and 92: Figure 3.2: Down selection models-
Page 93 and 94: cleansing methods were used to gene
Page 95 and 96: Discussion A striking result from t
Page 97 and 98: Figure 3.6: Concordance summary. Th
Page 99 and 100: whole model analysis without permut
Page 101 and 102: change, apparently the greater vari
Page 103 and 104: though in Chapter 2 we showed that
Page 105 and 106: Although a list of 325 candidate ge
Page 107 and 108: was determined to consist of 30 Pro
Page 109 and 110: Figure 4.1: Non-traditional PCA ana
Page 111 and 112: for the RMA and dCHIP interpretatio
Page 113 and 114: was one of them: it is counted as p
Page 115 and 116: Figure 4.5: Kaplan-Meyer survival c
Page 117 and 118: Figure 4.7: Low grade tumor surviva
Page 119 and 120: The candidate gene list values were
Page 121 and 122: ejecting the null hypothesis [8], a
Page 123 and 124: Figure 4.9: GO connectivity of cand
Page 125 and 126: under linear and non-linear dimensi
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sample cleansing process and these
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averaged to give a final approximat
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119 Table 5.1: : NSCLC candidate ge
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Figure 5.1: NSCLC ProbeSet gain sel
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Figure 5.3: NSCLC refined average p
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statistical criterion, but it appea
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lacking p53 mutations [30]. While,
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Kruppel-like factor 5 (KLF5) has al
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Appendix A # This is the main drive
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def Driver(usr, pswd, db, logfile,
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def DriverXH(usr, pswd, db, logfile
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fp.write('\tTable '), fp.write(msk[
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#determine outliers lowrs1=nonzero(
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tmp="update sample_mask set exclude
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fp.write('\n'+msk[ptr[j]]+' exclude
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cur, conn=UpdateWorkReg(cur, conn,
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Appendix E # The result of permutin
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BIBLIOGRAPHY 149
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13. Bowtell DD: Options available--
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method addressing dye, intensity-de
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73. Alter O, Brown PO, Botstein D:
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11. Kumari S, Verma LK, Weller JW:
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38. Michael Stonebraker LAR, Michae
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64. Cropp CS, Lidereau R, Leone A,
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15. Irizarry RA: affy. In.: Biocond
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Chapter 4: 1. Minna JD, Roth JA, Ga
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30. Delaval B, Ferrand A, Conte N,
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27. Bai J, Cederbaum AI: Catalase p
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51. Shouse GP, Cai X, Liu X: Serine
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