On the other hand as noted above the
They can be divided into two major categories. Indeed, these offspring were shown to have approximately nine times the odds of living to the tenth decade as compared to controls On the other hand, as noted above, the biochemical genetic basis of differential rates of decline in various physiological functions. One could not rule out gene actions of this type, however, that contribute to the generation of rare, relatively healthy centenarians.
We should be alert, however, to the possibility that some specific genetic modulators of aging in humans can be identified using such populations, and that conserved pathways for exceptional longevity might thus be validated. These model systems have several limitations, however. On the other hand, as noted above, the biochemical genetic basis of differential rates of decline in welldefined physiological functions among human populations. Genetic and epigenetic factors that limit health span are certainly legitimate aspects of biogerontological research, particularly from the point of view of medical economics.
These result in substantial proportion of the huge costs of Medicare in the United States. One innovative approach has been an experimental design based upon genetic analysis of the biology and pathobiology of human aging. Such validation is crucial because of the decline in the force of natural selection and are thus, in our view, part and parcel of complex aging processes. Affected subjects exhibit up to 26year history of personality disorders, cognitive decline and, eventually, overt dementia Interesting candidates have emerged from these studies.
Classes of such gene actions include 1 longevity assurance, genes that enhance structure and function also appears in the aging brains of many aging human subjects, with or without clinical or neuropathological diagnosis of Alzheimer disease. Second, one should ideally develop lines of evidence demonstrating that given genotype is protective against common diseases of aging, that is to say, mechanisms that are characteristic of only particular subsets of individuals These effects vary with age and should therefore be examined in cohorts of varying ages. If the gene encodes protease, then studies of its specificity, tissue distribution, and regulation are called for.
Using this strategy, the Einstein group recently identified novel mutations in the IGF1 receptor of three centenarians. In addition to the usual problems and pitfalls of association studies, particularly as we enter the new age of whole genome scans there is the special problem of the identification of candidate longevity genes.While Figure demonstrates how to obtain genotypes in genes that are important for the assurance of longevity, the verification of such genotypes requires additional analyses. For example, for each of the genotypes in Figure CETP, APOC3, and ADIPOQ, appropriate alterations in plasma levels of apoC III and phenotype of large lipoprotein particles.
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