Heat Shock and Development by L. Nover, L. Hightower (auth.), Professor Dr. Lawrence

By L. Nover, L. Hightower (auth.), Professor Dr. Lawrence Hightower, Professor Dr. Lutz Nover (eds.)

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J Embryo! Exp Morpho! 96:245-266 Mee JE, French V ( 1986b) Disruption of segmentation in a short germ insect embryo. II. The structure of segmental abnormalities induced by heat shock. J Embryo! Exp Morpho! 96:267-294 Miller D, McLennan AG (1988a) The heat shock response of the cryptobiotic brine shrimp Artemia. I. A comparison of the thermotolerance of cysts and larvae. J Therm Biol13:119-123 Miller D, McLennan AG (1988b) The heat shock response of the cryptobiotic brine shrimp Artemia. II. Heat shock proteins.

Further investigation of phenocopies induced in mutant heterozygotes may answer questions about how heat affects gene expression. 3 Effects of Heat Shock on Gene Expression Phenocopy inducing heat shocks tum off all RNA and protein synthesis for a period of 15-20 h following the heat shock (Mitchell and Lipps 1978; Petersen and Mitchell 1982). This, along with the resemblance of many phenocopies to mutant defects, led to the suggestion that it is the synthesis of critical gene products required for bristle construction which is affected by heat.

Mitchell The fact that a branched hair phenocopy can be induced in multiple wing-hair flies also indicates that these are independent events (Mitchell et al. 1990). 1 Induction of Phenocopy Thermotolerance The ability of flies at all development stages except early embryos (Walter et al. 1990) to survive at high temperatures can be dramatically improved by a short treatment of 30-60 min at 35 °C. This treatment induces the synthesis of heat shock mRNA and proteins which are thought to play a role in cell survival at otherwise lethal temperatures (Tissieres et al.

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