Chapter 13 Gene Technology Table of Contents Section 1 DNA Technology Section 2 The Human Genome Project Section 3 Genetic Engineering Chapter 13 Section 1 DNA Technology Objectives • Explain the significance of noncoding DNA to DNA identification. • Describe four major steps commonly used in DNA identification. • Explain the use of restriction enzymes, cloning vectors, and probes in making recombinant DNA. • Summarize several applications of DNA identification. Chapter 13 Section 1 DNA Technology DNA Identification • The repeating sequences in noncoding DNA vary between individuals and thus can be used to identify an individual. Chapter 13 Section 1 DNA Technology Steps in DNA Identification • Copying DNA: Polymerase Chain Reaction – To identify a DNA sample, scientists isolate the DNA and copy it using the polymerase chain reaction (PCR). Chapter 13 Section 1 DNA Technology Polymerase Chain Reaction Chapter 13 Section 1 DNA Technology Polymerase Chain Reaction Click below to watch the Visual Concept. Visual Concept Chapter 13 Section 1 DNA Technology Steps in DNA Identification, continued • Cutting DNA: Restriction Enzyme – The DNA is then cut into fragments using restriction enzymes. – Restriction enzymes recognize and cut specific nucleotide sequences. Chapter 13 Section 1 DNA Technology Restriction Enzymes Cut DNA Chapter 13 Section 1 DNA Technology Action of Restriction Enzymes Click below to watch the Visual Concept. Visual Concept Chapter 13 Section 1 DNA Technology Steps in DNA Identification, continued • Sorting DNA by Size: Gel Electrophoresis – The fragments are separated by size using gel electrophoresis. – The resulting pattern of bands is called a DNA fingerprint. Chapter 13 Section 1 DNA Technology Gel Electrophoresis Chapter 13 Section 1 DNA Technology DNA Fingerprint Click below to watch the Visual Concept. Visual Concept Chapter 13 Section 1 DNA Technology Recombinant DNA • Cloning Vectors – Researchers use restriction enzymes to insert DNA fragments into vectors. – The resulting DNA from two different organisms is called recombinant DNA. Chapter 13 Section 1 DNA Technology Cloning Vectors and Plasmids Click below to watch the Visual Concept. Visual Concept Chapter 13 Section 1 DNA Technology Applications For DNA Technology • DNA technology provides the tools to manipulate DNA molecules for practical purposes, such as forensic investigation to determine the identity of a criminal. Chapter 13 Section 2 The Human Genome Project Objectives • Discuss two major goals of the Human Genome Project. • Summarize important insights gained from the Human Genome Project. • Explain why animal model species are useful to study genes. • State how information from the Human Genome Project will be applied to future projects. • Relate bioinformatics, proteomics, and microarrays to the Human Genome Project. Chapter 13 Section 2 The Human Genome Project Mapping The Human Genome • The goals of the Human Genome Project were to determine the nucleotide sequence of the entire human genome and map the location of every gene on each chromosome. • This information will advance the diagnosis, treatment, and prevention of human genetic disorders. Chapter 13 Section 2 The Human Genome Project Mapping The Human Genome, continued • Important Insights – The Human Genome Project yielded important information about human genes and proteins. – For example, there are far fewer protein-encoding human genes than once believed but far more proteins because of the complex way they are encoded. Chapter 13 Section 2 The Human Genome Project Mapping The Human Genome, continued • Model Species – The Human Genome Project included sequencing the genes of many model species to provide insights into gene function. Chapter 13 Section 2 The Human Genome Project Mapping The Human Genome, continued • Applications – Information from the Human Genome Project has been applied to medical, commercial, and scientific purposes. Chapter 13 Section 2 The Human Genome Project The Future of Genomics • Bioinformatics – Bioinformatics uses computers to catalog and analyze genomes. Chapter 13 Section 2 The Human Genome Project The Future of Genomics, continued • Proteomics – Proteomics studies the identities, structures, interactions, and abundances of an organism’s proteins. Chapter 13 Section 2 The Human Genome Project The Future of Genomics, continued • Microarrays – DNA microarrays, two-dimensional arrangements of cloned genes, allow researchers to compare specific genes such as those that cause cancer. Chapter 13 Section 3 Genetic Engineering Objectives • Discuss the uses of genetic engineering in medicine. • Summarize how gene therapy is being used to try to cure genetic disorders. • Discuss cloning and its technology. • Describe two ways genetic engineering has been used to improve crop plants. • Discuss environmental and ethical issues associated with genetic engineering. Chapter 13 Section 3 Genetic Engineering Medical Applications • Genetic engineering is being used to provide therapies for certain genetic diseases. Chapter 13 Section 3 Genetic Engineering Medical Applications, continued • Gene Therapy – Gene therapy refers to treating genetic disorders by correcting a defect in a gene or by providing a normal form of a gene. – Researchers hope that gene therapy can be used to cure genetic disorders in the future. Chapter 13 Section 3 Genetic Engineering Medical Applications, continued • Cloning – In cloning by nuclear transfer, a nucleus from a body cell of one individual is introduced into an egg cell (without its nucleus) from another individual. – An organism identical to the nucleus donor results. Chapter 13 Section 3 Genetic Engineering Cloning Click below to watch the Visual Concept. Visual Concept Chapter 13 Section 3 Genetic Engineering Genetically Engineered Vaccines Chapter 13 Section 3 Genetic Engineering Agricultural Applications • Genetic engineering is used to produce diseaseresistant, pest-resistant, and herbicide-resistant crops in an effort to improve the yields and nutrition of the human food supply. Chapter 13 Genetic Engineering and Cotton Plants Section 3 Genetic Engineering Chapter 13 Section 3 Genetic Engineering Ethical Issues • Some people fear that the release of genetically modified organisms would pose an environmental risk. • Many safety, environmental, and ethical issues involved in genetic engineering have not been resolved.