GENE THERAPY FOR ADENOSINE DEAMINASE DEFICIENCY Presented by SAMINA PARVEEN ROLL NO. 216 UID: 100484
GENE THERAPY It is the curing of a genetic disorder by introducing into the individual a normal gene in order to replace or overcome the effects of a mutant gene. There are two types of gene therapy: Somatic cell therapy Germ line cell therapy
TYPES OF GENE THERAPY Somatic cell therapy Germ line cell therapy Somatic cells are modified genetically to prevent a genetic defect in the offspring. Germ line cells are used to correct a genetic defect.
ADENOSINE DEAMINASE DEFICIENCY{ADA} ADA deficiency is one form of SCID (severe combined immunodeficiency), a type of disorder that affects the immune system. The disease is caused by a mutation in a gene on chromosome 20, which codes for the enzyme adenosine deaminase (ADA). Without this enzyme, the body is unable to break down a toxic substance called deoxyadenosine. The toxin builds up and destroys infection-fighting immune cells called T and B lymphocytes
GENE THERAPY FOR ADA TREATMENT First clinical gene therapy was given in 1990 to a 4 year old suffering from ADA. Steps for carrying it out- T cells were isolated from the girl and grown The normal ADA gene was introduced using a viral vector The “engineered cells” were then re-introduced into the patient
CHALLENGES IN GENE THERAPY Gene delivery and activation Immune Response Case of Jesse Gelsinger Disrupting important cells in target tissue
REFERANCES BOOK i-Genetics by Peter Russell Internet sites www.geneed.nlm.nih.gov www.his.nih.gov www.montegen.com www.learn.genetics.utah.edu