Name ____________________________ Date ______________ Period ________ Biology Unit 4 – Genetics, Background Paper 4-9 Genetic Engineering In nature mutations occur at regular intervals. Most mutations have no effect on the organism. Those few mutations that do cause some change in an organisms’ phenotype are then tested for usefulness by the environment the organism lives in. If the mutation is not detrimental, or offers some advantage, the mutation is passed on to the mutated organisms’ offspring. This is the way that nature has worked for millions of years. With the knowledge of how the cell works humans have learned to use the natural system of mutation to ‘engineer’ life. We can now make changes in the genome (total DNA code) of an individual organism to repair damage to DNA, introduce new characteristics, and even combine the DNA of two very different organisms. Consider the following scenario. Researchers find that a protein produced by a rare tree growing in the Pacific Northwest limits the growth of breast cancer in cases that other treatments do not seem to help. A drug industry grows up utilizing the protein extracted from the tree. The slow growing tree is rare, 30 pounds of bark are needed to extract the drug is extremely expensive and not enough can be made to meet demand. Even though the drug produced from the tree is a promising cancer treatment it is not practical and production of the drug halts. Genetic engineering enters the story at this point. The gene that produces the lifesaving protein is identified, removed, and inserted into the DNA of an easily grown bacterium (E. coli). The bacteria now read the instructions inserted into its DNA and begin churning out the cancer killing protein. The drug becomes cheap and plentiful offering cures for many women with breast and ovarian cancer. The above scenario closely follows the career of the drug Taxol. Taxol was found in the bark of the Pacific Yew tree. Trials showed it to be highly effective in treating cancer and it received FDA approval. Taxol soon became the drug of choice in treating several cancers. Sales of Taxol peaked in 2001 at 1.6 billion dollars. Early on it was apparent that the Yew would become extinct in just a few short years. Bioengineers continue working to produce the drug as described in the scenario above. In lab you will perform a transformation (insertion of a segment of DNA into E.coli ) in the same way that researchers produce new drugs such as Taxol, Human Growth Hormone, and even Human Insulin. Background 4-9, GeneticEngineering2012 Text 2009 Greg Ballog Page 1 Name ____________________________ Date ______________ Period ________ Title of Reading: 4-9 Genetic Engineering Points Earned 1 2 3 4 5 6 7 Concept Map of Reading (3 points) Main Idea A) What one question do I have about this article? 1 Point A&B B) Show or describe the reading to a parent or guardian (Name ___________________). What comments or questions did they have concerning the reading? (Biology Homework Time __________) Background 4-9, GeneticEngineering2012 Text 2009 Greg Ballog # 1 2 3 Answers Page 2