FUNCTIONAL GENOMICS REVEAL THAT THE SERINE SYNTHESIS PATHWAY IS ESSENTIAL IN BREAST CANCER Introduction: Tim Butler Spellman Lab.

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Volume 12, Issue 6, Pages (December 2007)

Presentation transcript:

FUNCTIONAL GENOMICS REVEAL THAT THE SERINE SYNTHESIS PATHWAY IS ESSENTIAL IN BREAST CANCER Introduction: Tim Butler Spellman Lab

Today’s Topics Metabolism and Cancer Functional Genomics Breast Cancer

Metabolism and Cancer Jones R G, Thompson C B Genes Dev. 2009;23:

Warburg Effect Under aerobic conditions tumor cells rely on glycolysis ~9x less ATP generated Proliferating cells need more than just ATP Lactate used to increase biomass Warburg effect a phenotype of proliferating cells, including tumors Vander Heiden, et. al., Science 2009;324.

Tumor Genes and Metabolism Jones R G, Thompson C B Genes Dev. 2009;23:

Understanding Cancer Metabolism Metabolic pathways are utilized differently in cancer Identifying metabolic genes that tumors are dependent on may lead to new therapeutic targets Rohren et. al., Radiology 2004

Functional Genomics Genomic studies of disease focus on identifying DNA alterations that are overrepresented Functional genomics focuses on measuring the functional consequences of disrupting gene expression RNAi is used to knockdown gene expression and screen for consequences Gene Expression Proliferation Drug sensitivity

RNA interference (RNAi) Uses RNA sequence complementary to a target gene to degrade transcripts Knocks down protein level Can be delivered via siRNA, shRNA plasmid, or shRNA lentivirus "Gene Silencers." Santa Cruz Biotechnology, Inc. Web. 10 Feb

Lentiviral shRNA Delivery Lentivirus will integrate its genome into target genome Allows for constant expression at low levels, minimizing off target effects Vector contains: shRNA sequence Antibiotic resistance Promoters Biosafety features Lentiviral Machinery Jason Moffat, et. al., Cell, Volume 124, Issue 6, 24 March 2006

Breast Cancer Prognosis and treatment determined by molecular subtype Estrogen Receptor (ER), Progesterone Receptor (PR), and HER2 primary markers ER/PR Positive tumors dependent on androgens, treated with compounds that deplete androgens (tamoxifen) HER2 Positive tumors respond to monoclonal antibody Herceptin Cell lines have been created that represent all the major subtypes of breast cancer Used as model systems to understand breast cancer biology, identify vulnerabilities, and test therapies

Breast Cancer Survival Luminal A (ER+,PR+,HER2-) Luminal B (ER+/-,PR+/-,HER2-/+) Claudin-Low (ER-,PR-,HER2-) Her2 Enriched (ER-,PR-,HER2+) Basal-Like (ER-,PR-,HER2-) Pilar Eroles et. Al., Cancer Treatment Reviews 16 December 2011.

Take Home Message Tumors utilize metabolism differently than quiescent cells A better understanding of tumor metabolism can identify vulnerabilities RNAi is an effective method to conduct large scale screens to identify functionally important genes Breast cancer cell lines are a valuable resource for investigating tumor biology