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knudson
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Possible Crossword Clues |
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George ____ (Perennial PGA tour winner) |
Last Seen in these Crosswords & Puzzles |
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Oct 22 2018 Canadiana |
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The Knudson hypothesis, also known as the two-hit hypothesis is the hypothesis that most genes require two mutations to cause a phenotypic change. It was first formulated by Alfred G. Knudson in 1971 and led indirectly to the identification of cancer-related genes. Knudson won the 1998 Albert Lasker Clinical Medical Research Award for this work. * Knudson performed a statistical analysis on cases of retinoblastoma, a tumor of the retina that occurs both as an inherited disease and sporadically. He noted that inherited retinoblastoma occurs at a younger age than the sporadic disease. In addition, the children with inherited retinoblastoma often developed the tumor in both eyes, suggesting an underlying predisposition. * Knudson suggested that two "hits" to DNA were necessary to cause the cancer. In the children with inherited retinoblastoma, the first mutation in what later came to be identified as the RB1 gene, was inherited, the second one acquired. In non-inherited retinoblastoma, instead two mutations, or "hits", had to take place before a tumor could develop, explaining the later onset. * It was later found that carcinogenesis (the development of cancer) depended both on the mutation of proto-oncogenes (genes that stimulate cell proliferation) and on the deactivation of tumor suppressor genes, which are genes that keep proliferation in check. Knudson's hypothesis refers specifically, however, to the heterozygosity of tumor suppressor genes. A mutation in both alleles is required, as a single functional tumor suppressor gene is usually sufficient. Some tumor suppressor genes have been found to be "dose-dependent" so that inhibition of one copy of the gene (either via genetic or epigenetic modification) may encourage a malignant phenotype, which is termed haploinsufficiency. |