* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Case Study 3: Hutchinson-Gilford`s Progeria Syndrome
Survey
Document related concepts
Epigenetic clock wikipedia , lookup
DNA damage theory of aging wikipedia , lookup
Artificial gene synthesis wikipedia , lookup
Public health genomics wikipedia , lookup
Oncogenomics wikipedia , lookup
Site-specific recombinase technology wikipedia , lookup
Neuronal ceroid lipofuscinosis wikipedia , lookup
Microevolution wikipedia , lookup
Point mutation wikipedia , lookup
Gene therapy of the human retina wikipedia , lookup
Designer baby wikipedia , lookup
Polycomb Group Proteins and Cancer wikipedia , lookup
Genome (book) wikipedia , lookup
Vectors in gene therapy wikipedia , lookup
Transcript
Case Study 3: Werner’s Syndrome a progeric disease Cell Division Cell Cycle Aging What mechanisms control the proliferation of cells? What governs the life span of an organism? Cell death as a necessary and important part of development: Apoptosis (programmed cell death) Context: George Martin, 1978 ‘Genetic Syndromes in Man with Potential Relevance to the Pathology of Aging’ < 7000 genes: involved in degenerative processes associated with aging Between 70 and 7 genes: control processes having large impact on senescence What is cell senescence? Divide certain # of times then enter G0 and eventually die Aging a multigene process 10 genetic diseases that mimic aging process—but only in part Appears Chromosomal aneuploides Down’s syndrome Birth Dementia, cataracts, diabetes, hair graying, cancer Known single mutant geneWerner’s syndrome Skin ‘thinning’, Hair graying and loss, atherosclerosis, Cataracts, cancer diabetes, osteoporosis Unknown but thought to be single gene Hutchinson-Gilford’s Progeria Skin ‘thinning’ hair loss, atherosclerosis, osteoporosis, hypertension In 20’s Helicase Birth/1yr ?? Werner’s Syndrome www.pathology.washington.edu/werner/ Werner’s history Named for C. W. Otto Werner (1879-1936) Rural doctor, medical officer in German Navy WWI Rare autosomal recessive disease Approx 1 in 200 people carriers for defective gene Approx 3 in 1,000,000 people have the disease (Slightly higher percentage in Japan) Onset of symptoms early to mid 20’s, Major cause of death—heart attack in mid 40s Cells of Progeria and WS Cell Culture What do cells need to proliferate? When compare fibroblasts of child with Progeria and their parent Child’s cells are ‘older’ in terms of replication Fibroblasts ‘normal cells’ divide ~12 to 24 hours Divide approx 50times in culture Progeric Fibroblasts: Rarely ever double Few cell generations before death Note: Often ‘Progeric’ used to describe any premature aging as well as the disease Hutchinson Gilford Progeria Why do we age?/How how do we age? Short answer: Don’t know The 3 R’s: Mutation effecting DNA reading, replicating or repair Hypotheses for Aging: Free Radical Theory: Aging due to accumulation of damage from free radicals Telomere Theory: Chromosome ends shorten with divisions Cause of Werner’s syndrome Helicase defect: Mutation Chromosome 8 in WRN gene all 35 known mutations result in truncated protein all ‘remove’ nuclear targeting sequence different mut’s associated with different cancers Case Study Focuses Cell death: damage and apoptosis Telomeres and replication Cell Cycle and its regulation