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Chapter 4: Uniparental disomy is a prevalent genetic mechanism of oncogene disruption in lung adenocarcinoma 3 3 A version of this chapter will be submitted for publication with the following author list: Chari R, Lockwood WW, Soh J, Coe BP, Tam K, MacAulay CE, Minna JD, Lam S, Gazdar AF, Lam WL. (2010) Uniparental disomy is a prevalent genetic mechanism of oncogene disruption in lung adenocarcinoma. 79
4.1 Introduction Genetic alterations play a significant role in a variety of malignancies [1, 2]. Typically, these alterations have been represented by either changes in gene dosage (DNA copy number) or somatic mutations such as total copy number gain or activating mutations of oncogenes and total copy number loss or inactivating mutations of tumor suppressor genes. Loss of heterozygosity is also a common alteration whereby one allele is lost and often, results in a loss of total copy number. However, there are instances in which where one allele is lost but the remaining allele is duplicated resulting in no net change in copy number, termed copy neutral loss of heterozygosity or somatic uniparental disomy (UPD). Although somatic UPD had been shown previously in malignancies such as retinoblastoma [3], recent studies have shown an increased prominence of this alteration [4]. This largely been a result of advances in technology to detect somatic UPD and advances in the methodologies to define UPD [5, 6]. Moreover, frequent regions of somatic UPD have been identified in many different cancer types such as colorectal cancer [7, 8], lymphoma [9, 10], myelodysplastic syndrome (MDS) [11-13], basal cell carcinoma [14], hepatoblastoma [15], and ovarian cancer [16]. In addition, while the target gene of some of these regions have been associated to tumor suppressors such as RB1 and TP53, where the gene is likely mutated, the targets have also been associated with oncogenes. For example, mutation with somatic UPD has been observed at loci such as JAK2 [6, 17], CBL [12, 18], FLT3 [19] in hematological malignancies. However, such associations have been limited in epithelial malignancies. Recently, we have illustrated the concept of mutant allele specific imbalance (MASI) in lung cancer [20]. It was found that a highly activated state for EGFR and KRAS is achieved through either copy number amplification of the mutated allele for EGFR and UPD of the mutated allele for KRAS. With the observed frequency of UPD at KRAS as such, we sought to assess the impact and prevalence of UPD in the lung adenocarcinoma genome. Strikingly, we found that the amount of the genome affected frequently by UPD was comparable to that of copy number 80
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DEVELOPMENT AND APPLICATION OF AN I
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Table of Contents Abstract ........
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3.3.2 Multi-dimensional analysis (M
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List of Tables Table 2.1. Features
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Figure 5.3. Overlay of chromosomal
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RB1 Retinoblastoma 1 RNA Ribonuclei
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Dedication To my family. xiii
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Chapter 5: Chari R, Thu KL, Wilson
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1.1 Lung cancer Lung cancer has the
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expression changes are reactive to
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number of different cancer types. M
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large number of tumors, that a give
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(B) By using an integrative approac
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platforms, with one of the latest s
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1.12.1 Development of tools for gen
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quantitative PCR experiments as wel
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1.13 References 1. Jemal A, Siegel
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33. Garber ME, Troyanskaya OG, Schl
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71. Shivapurkar N, Gazdar AF: DNA M
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Chapter 2: SIGMA 2 : A system for t
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Here, we present SIGMA 2 , a novel
Page 43 and 44: datasets. To utilize this, the user
Page 45 and 46: 2.3.7 Analysis of data from multipl
Page 47 and 48: expression (Figure 2.8). ERBB2 has
Page 49 and 50: Figure 2.1 R -Segmentation -Statist
Page 51 and 52: Figure 2.3 numSamples
Page 53 and 54: Figure 2.5. Consensus calling and h
Page 55 and 56: Figure 2.6 HCC2218 HCC2218 HCC2218B
Page 57 and 58: Figure 2.8. Multi-dimensional persp
Page 59 and 60: Table 2.1. Features required for in
Page 61 and 62: 2.6 References 1. Garnis C, Buys TP
Page 63 and 64: Chapter 3: An integrative multi-dim
Page 65 and 66: observed gene expression deregulati
Page 67 and 68: Raw gene expression profiles from a
Page 69 and 70: screening approach to gene amplific
Page 71 and 72: many regions of frequent LOH/AI do
Page 73 and 74: approach to examining the whole gen
Page 75 and 76: PTEN expression [44]. Using this pa
Page 77 and 78: mechanisms at the DNA and RNA level
Page 79 and 80: In this study, three DNA dimensions
Page 81 and 82: Figure 3.2. Quantitative and qualit
Page 83 and 84: Figure 3.3 a Proportion of genes in
Page 85 and 86: 70 Figure 3.5 -log(pvalue) 5.0 4.0
Page 87 and 88: 72 Figure 3.7 Sample: HCC1008 Copy
Page 89 and 90: Figure 3.8 a b Proportion of random
Page 91 and 92: 16. Chari R, Lockwood WW, Coe BP, C
Page 93: 50. Giovane A, Pintzas A, Maira SM,
Page 97 and 98: 4.2.3 Determining frequent regions
Page 99 and 100: etween loss and UPD (Figure 4.3). S
Page 101 and 102: obtained, profiled and used as the
Page 103 and 104: Figure 4.1. Detection of UPD using
Page 105 and 106: Figure 4.2. Comparison of frequent
Page 107 and 108: Figure 4.3 Gain Loss 642 441 7 Figu
Page 109 and 110: 94 Figure 4.4 1 2 3 4 5 6 7 8 9 10
Page 111 and 112: Figure 4.6 a b c Percent of cases A
Page 113 and 114: Figure 4.7 a b 6p25.3 Log2 fold cha
Page 115 and 116: Chr BPStart BPEnd # of Chr BPStart
Page 117 and 118: Table 4.3. Overlap of oncogenes in
Page 119 and 120: Table 4.5. Cell lines and oncogene
Page 121 and 122: Table 4.7. RefSeq genes in focal re
Page 123 and 124: 4.6 References 1. Bell DW: Our chan
Page 125 and 126: 33. Garnis C, Coe BP, Lam SL, MacAu
Page 127 and 128: 5.1 Introduction In the past decade
Page 129 and 130: polymorphism (SNP) arrays with over
Page 131 and 132: substitutions) and UV exposure (C t
Page 133 and 134: developed antibodies and methylated
Page 135 and 136: Histone modification states. While
Page 137 and 138: metastasis [226]. High throughput a
Page 139 and 140: Implications on sample size require
Page 141 and 142: analyzed using the "minet" package
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Figure 5.2 # of copies Total copy n
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Figure 5.4. Integration of copy num
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Figure 5.5. Integration of copy num
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Figure 5.6 SHC1 GRB2 SOS2 RRAS ER R
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Figure 5.8 a Log2 Fold Change (T vs
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Figure 5.10 (a) (b) Figure 5.10. Au
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Table 5.2. List of genomic resource
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5.5 References 1. Pinkel D, Segrave
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37. Oliphant A, Barker DL, Stuelpna
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75. Selzer RR, Richmond TA, Pofahl
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111. Melcher R, Al-Taie O, Kudlich
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145. Takai D, Yagi Y, Wakazono K, O
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179. Kondo M, Suzuki H, Ueda R, Osa
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alterations in human prostate cance
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248. Xi L, Feber A, Gupta V, Wu M,
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281. Fernandez-Ranvier GG, Weng J,
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Chapter 6: Conclusions 162
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can identify nearly three times as
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was identified in a small set of sa
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will be done at the pathway level a
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previously described genetic and ep
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16. Zhang K, Li JB, Gao Y, Egli D,
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APPENDIX I: List of publications Th
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This publication is described in se
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This chapter details the technologi
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epigenetic alteration. This led to
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This manuscript describes the curre
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APPENDIX III: Sources of data Sampl
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APPENDIX V: Kaplan-Meier and Oncomi
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APPENDIX VI: Summary of Kaplan-Meie
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University of British Columbia - Br
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