Classical genetic methods, driven by phenotype rather than hypotheses, generally permit the identification of all proteins that serve nonredundant functions in a defined biological process. Long before this goal is achieved, and sometimes at the very outset, genetics may cut to the heart of a biological puzzle. So it was in the field of mammalian innate immunity. The positional cloning of a spontaneous mutation that caused lipopolysaccharide resistance and susceptibility to Gram-negative infection led directly to the understanding that Toll-like receptors (TLRs) are essential sensors of microbial infection. Other mutations, induced by the random germ line mutagen ENU (N-ethyl-N-nitrosourea), have disclosed key molecules in the TLR signaling pathways and helped us to construct a reasonably sophisticated portrait of the afferent innate immune response. A still broader genetic screen-one that detects all mutations that compromise survival during infection-is permitting fresh insight into the number and types of proteins that mammals use to defend themselves against microbes.
|Original language||English (US)|
|Number of pages||37|
|Journal||Annual Review of Immunology|
|Publication status||Published - 2006|
- Innate immunity
- Mendelian genetics
ASJC Scopus subject areas