Chapter 8: Genetic Engineering by Mailee Phet by Mailee Phet My Hoa Nguyen.

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Presentation transcript:

Chapter 8: Genetic Engineering by Mailee Phet by Mailee Phet My Hoa Nguyen

What is gene therapy? It is possible that gene therapy given to an adult could reverse a genetic disease. If so, would that therapy also prevent any children the person had after gene therapy from inheriting the disease? Explain why or why not, and what factors the answer would depend on.

What is Gene Therapy?  The Human Genome Project may provide information that can be used to help replace genes that are defective or missing in people with genetic diseases  experimental technique using genes to prevent/ treat genetic diseases replace a mutated gene with a healthy one replace a mutated gene with a healthy one deactivating a gene that isn’t functioning properly deactivating a gene that isn’t functioning properly introduce a new gene in the body to help fight the disease introduce a new gene in the body to help fight the disease

Germline Gene Therapy  normal version of gene is inserted into germ cells those germ cells will divide normal versions of the gene those germ cells will divide normal versions of the gene any zygote produced as a result of this germ cell will have a correct version of the defective gene and will continue passing it on to their offspring any zygote produced as a result of this germ cell will have a correct version of the defective gene and will continue passing it on to their offspring

Somatic Cell Gene Therapy  single defective cell taken out of an individual’s body  functional version of gene introduced into cell in a laboratory cells reproduce cells reproduce copies of cells with a corrected version of the gene is injected back into the patient copies of cells with a corrected version of the gene is injected back into the patient  the good gene ends with the patient and is not inherited by their offspring

 In 1990, a 4 year old girl named Ashi DiSilva was the first patient to receive gene therapy for SCID (severe combined immunodeficiency).  She became a healthy adult with an immune system that was able to fight off most infections.

However…  gene therapy is still in its early stages and is far from perfection it can only be used in diseases caused by a single gene malfunction it can only be used in diseases caused by a single gene malfunction many diseases are caused by multiple genes many diseases are caused by multiple genes it can be hard to get a good gene to the specific place it needs to be it can be hard to get a good gene to the specific place it needs to be more damage can be caused by genes being put in the wrong place more damage can be caused by genes being put in the wrong place death can result due to infections and invasions of other viruses death can result due to infections and invasions of other viruses

Ethical Issues  Who decides what is normal and what is a defect?  What kind of an impact will this have on people who are currently living with these disabilities. Will this make them feel worse about themselves?  Gene therapy is expensive so will only the rich have access to treatment? What will happen to the poor?