The sequencing of the human genome has revealed an almost complete"parts list" for the study of the genetic basis of disease.1,2The Online Mendelian Inheritance in Man data base lists morethan 1000 human genes that have been implicated in specificdiseases.3 It is likely that within a few years the causativelesion in most diseases that result from a mutation in a singlegene will have been characterized, and geneticists are usingsophisticated methods to track genes in polygenic diseases that is, diseases caused by defects in more than a single gene.
Identifying Genes Causing Human Disease in Model Organisms
Discovering New Genes
Defining Cellular Pathways
Toward Therapeutics
The Future
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From the Massachusetts General Hospital Cancer Center, Charlestown, Mass., and Harvard Medical School, Boston.
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