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ABSTRACT: Whole-exome sequencing of gallbladder carcinoma

PROVIDER: PRJNA821382 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR18532527_1.fastq.gz	Fastqsanger.gz
	SRR18532527_2.fastq.gz	Fastqsanger.gz
	SRR18532528_1.fastq.gz	Fastqsanger.gz
	SRR18532528_2.fastq.gz	Fastqsanger.gz
	SRR18532529_1.fastq.gz	Fastqsanger.gz

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Whole exome sequencing of human tumours and cell lines to investigate how ERBB2 and KRAS Alterations mediate response to EGFR inhibitors in early stage Gallbladder Cancer

Project description:Purpose: The uncommonness of gallbladder cancer in the developed world has contributed to the generally poor understanding of the disease. The development of new and effective treatment has been and continues to be a major public health imperative. Methods: We report mutational and copy number analysis of 44 predominantly early-staged gallbladder tumors and 5-gallbladder cancer cell lines by a combination of directed and whole exome sequencing at an average coverage of 100X and above. Using gallbladder cancer cell lines and xenograft mouse models we performed phospho-proteome array profiling, followed by an in-depth functional characterization. Results: We describe recurrent activating ERBB2 somatic mutation in 6 of 44 gallbladder primary tumors with an overall mutation frequency of 13%, along with KRAS activating mutations in 3 of 44 samples. Consistent with whole exome findings, a phospho-proteomic array profile of 49-tyrosine kinase revealed constitutive phosphorylation of ERBB2 and EGFR that were found to heterodimerize. We demonstrate that treatment with ERBB2-specific, EGFR-specific shRNA or with covalent EGFR family inhibitor BIBW-2992 inhibits transformation, survival, migration, invasion, and tumor forming characteristics of gallbladder cancer cells harboring wild type or KRAS (G13D) but not KRAS (G12V) mutation. Furthermore, we show in vivo reduction in tumor size is paralleled by a reduction in the amounts of phospho-ERK in KRAS (G13D) but not in KRAS (G12V) xenografts, validating the in vitro findings Conclusion: Findings from this study implicate ERBB2 as an important therapeutic target in early stage gallbladder cancer. We also present the first evidence that the presence of KRAS (G12V), but not KRAS (G13D) mutation, may preclude gallbladder cancer patients to respond to anti-EGFR treatment, similar to the clinical algorithm commonly practiced to opt for anti-EGFR treatment in colorectal cancer.

2018-12-29 | E-MTAB-6619 | biostudies-arrayexpress

Genomic landscape of carcinogen induced mouse skin squamous cell carcinoma: whole-exome sequencing

Project description:Whole-exome sequencing of induced murine squamous cell carcinoma. 26 samples are included.

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Project description:The study involves whole exome sequencing of 20 primary tumors obtained from lung squamous carcinoma patients of Indian origin. With this, we aim to describe the mutational profile of this specific subset of lung cancer patients. This knowledge will further allow us to gain an insight into potentially actionable genomic alterations prevalent in Indian lung squamous carcinoma.

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Project description:Purpose: There are three goals of this study: 1. To compare the genomic, exome and chromatin accessiblity profiles of the specific engineered fallopian tube cells of high-grade serous tubo-ovarian cancer (HGSC) models (this study) using whole-exome, whole-genome and ATAC-seq sequencing. Methods: For whole-exome analysis, genomic DNA was extracted from the cell lines mentioned below. Conclusions: We conclude that whole-exome, whole-genome and ATAC-seq characterization would expedite genetic network analyses and permit the dissection of complex biological functions.

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Project description:Whole exome sequencing data of 22 gallbladder cancer (FFPE)

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Project description:Cancer is predominantly a somatic disease. A mutant allele found in cancer cell genome is considered somatic when it is absent in paired normal genome and dbSNP, the most comprehensive public SNP database. However, dbSNP inadequately represents several non-Caucasian populations including that from the Indian subcontinent, posing a limitation in cancer genomic analyses of data from these populations. We present TMC-SNPdb, as the first open source freely accessible (through ANNOVAR), flexible and upgradable SNP database from whole exome data of 62 normal samples derived from cancer patients of Indian origin, representing 114,309 unique germline variants. TMC-SNPdb is presented with a companion subtraction tool that can be executed with command line option or an easy-to-use graphical user interface (GUI) with the ability to deplete additional Indian population specific SNPs over and above that possible with dbSNP and 1000 Genomes databases. Using an institutional generated whole exome data set of 132 samples of Indian origin, we demonstrate that TMC-SNPdb reduced 42%, 33% and 28% false positive somatic events post dbSNP depletion in Indian origin tongue, gallbladder, and cervical cancer samples, respectively. Beyond cancer somatic analyses, we anticipate utility of TMC-SNPdb in several Mendelian germline diseases.

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