I. Role of Gene Expression  Gene expression is the activation (“turning on”) of a gene ◦ Separation of fingers and toes Genome: complete genetic material.

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Presentation transcript:

I. Role of Gene Expression  Gene expression is the activation (“turning on”) of a gene ◦ Separation of fingers and toes Genome: complete genetic material contained in an individual sciencedaily.com

 Discovered in the early 1960’s by Francois Jacob and Jacques Monod  they were studying how genes control the metabolism of sugar lactose (found in milk) in E. coli

 Regulator genes code for repressor proteins which stop a gene from being expressed course1.winona.edu

 Lactose binds to the repressor protein forcing it to detach and allowing RNA polymerase to begin transcription producing mRNA course1.winona.edu

 Much more complex than prokaryotes  Multicellular  Contain genetic information within the nucleus

 Euchromatin- site of active transcription in DNA and RNA **Some portions remain permanently coiled in chromosomes-these genes can never be transcribed**  Introns- transcribed but NOT translated  Exons- BOTH transcribed and translated

 Pre-mRNA ◦ Contains both introns and exons ◦ Exon splicing occurs turning pre-mRNA into mRNA tokresource.org

Path from DNA to Proteins library.thinkquest.org/C006188/basics/rna.htm

 Cell Differentiation – cells have specific jobs within the cell ◦ Muscle cells-specialize in movement ◦ Red blood cells-carry oxygen ◦ Liver Cells-break down fat  Morphogenesis- development of structure in an organism

 Determine where anatomical structures develop during morphogenesis ◦ Anntennapedia-mutation occurring in this gene that makes a leg grow where an antenna should be

Cells are constantly switching genes on and off  DNA chip- used for tracking gene expression ◦ Fragments are tagged with a fluorescent compound which lights up when that gene is turned on nih.gov

III.Cancer  Cancer- uncontrolled growth of cells that invades other parts of the body  Proto-oncogenes- regulate cell growth and division ◦ Mutations change a proto- oncogene into an oncogene  Oncogene- uncontrolled cell division and over expression of proteins at the wrong time

 Tumor- abnormal proliferation of cells ◦ Benign- growth that doesn’t spread ◦ Malignant-invades and destroys tissues at different places within the body- metastasis pathology.vcu.edubelieve-or-not.blogspot.com

 Carcinogen-any substance that promotes cancer (ex. Tobacco smoke, UV rays, viruses) ◦ Mutagens- agents that cause mutations to occur with in a cell Kinds of Cancer  Carcinomas- grow in the tissues lining organs  Sarcomas-grow in bone and muscle tissue  Lymphomas-solid tumors growing in the lymphatic system  Leukemia  Leukemia- uncontrolled growth in blood tissues. Viruses – stimulate uncontrolled growth in host cells causes some cancers in blood forming tissues and HPV which causes cervical cancer These 3 cancers can occur anywhere within the body but they get there name from the place they start

Whether you are 2 or 92, cancer affects us all. Whether you are black or white, red, brown or, yellow, Cancer does not discriminate! Everyone is susceptible to cancer... you... your spouse... cancer doesn't care if you are rich, poor or somewhere in between.