title: Hsp90 as a capacitor of phenotypic variation.
abstract: Heat-shock protein 90 (Hsp90) chaperones the maturation of many regulatory proteins and, in the fruitfly Drosophila melanogaster, buffers genetic variation in morphogenetic pathways. Levels and patterns of genetic variation differ greatly between obligatorily outbreeding species such as fruitflies and self-fertilizing species such as the plant Arabidopsis thaliana. Also, plant development is more plastic, being coupled to environmental cues. Here we report that, in Arabidopsis accessions and recombinant inbred lines, reducing Hsp90 function produces an array of morphological phenotypes, which are dependent on underlying genetic variation. The strength and breadth of Hsp90's effects on the buffering and release of genetic variation suggests it may have an impact on evolutionary processes. We also show that Hsp90 influences morphogenetic responses to environmental cues and buffers normal development from destabilizing effects of stochastic processes. Manipulating Hsp90's buffering capacity offers a tool for harnessing cryptic genetic variation and for elucidating the interplay between genotypes, environments and stochastic events in the determination of phenotype.
authors.affiliation: Department of Molecular Genetics and Cell Biology, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: Christine
authors.initials: C
authors.lastname: Queitsch
authors.forename: Todd A
authors.initials: TA
authors.lastname: Sangster
authors.forename: Susan
authors.initials: S
authors.lastname: Lindquist
mesh_terms: D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D005075:Biological Evolution; D003433:Crosses, Genetic; D003624:Darkness; D004777:Environment; D017343:Genes, Plant / Q000235:genetics; D005818:Genetic Engineering; D014644:Genetic Variation / Q000235:genetics*; D005838:Genotype; D018841:HSP90 Heat-Shock Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D008027:Light; D010641:Phenotype; D030821:Plants, Genetically Modified; D013269:Stochastic Processes
chemical_list: D029681:Arabidopsis Proteins; D018841:HSP90 Heat-Shock Proteins