title: Microarray analysis of juvenile hormone response in Drosophila melanogaster S2 cells.
abstract: A microchip array encompassing probes for 14,010 genes of Drosophila melanogaster was used to analyze the effect of juvenile hormone (JH) on genome-wide gene expression. JH is a member of a group of insect hormones involved in regulating larval development and adult reproductive processes. Total RNA was isolated from Drosophila S2 cells after 4 hours treatment with 250 ng/ml (10R) JH III or 250 ng/ml methyl linoleate. A collection of 32 known or putative genes demonstrated a significant change with JH III treatment (r > 2.0, P <or= 0.005). Of these, the abundance of 13 transcripts was significantly increased and 19 decreased. The expression of a subset of these loci was analyzed by real-time quantitative reverse transcription polymerase chain reaction (RT-qPCR). Three loci that exhibited constant expression in the presence and absence of JH III (RP49 [FBgn0002626], FBgn0023529, and FBgn0034354) were evaluated and found to be reliable invariant reference transcripts for real-time RT-qPCR analysis using BestKeeper and geNorm software. Increased expression in presence of JH III was confirmed by real-time RTqPCR analysis. However, only one of five loci that exhibited reduced expression on microarrays could be confirmed as significantly reduced (P <or= 0.05). Among the confirmed JH III up-regulated genes were two loci of unknown function (FBgn0040887 and FBgn0037057) and Epac, an exchange protein directly activated by cyclic AMP, a guanine nucleotide exchange factor for Rap1 small GTPase.
authors.affiliation: USDA/ARS Vegetable Crops Research Unit, University of Wisconsin - Madison, Madison, WI 53706, USA. dkwillis@wisc.edu
authors.forename: David K
authors.initials: DK
authors.lastname: Willis
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Joliene R
authors.initials: JR
authors.lastname: Lindholm
authors.forename: Anthony
authors.initials: A
authors.lastname: Orth
authors.forename: Walter G
authors.initials: WG
authors.lastname: Goodman
mesh_terms: D000818:Animals; D002460:Cell Line; D004331:Drosophila melanogaster / Q000187:drug effects / Q000378:metabolism*; D019848:Gene Expression Regulation, Archaeal / Q000187:drug effects*; D055106:Genome-Wide Association Study; D007605:Juvenile Hormones / Q000494:pharmacology*; D008041:Linoleic Acids / Q000494:pharmacology; D020411:Oligonucleotide Array Sequence Analysis; D015203:Reproducibility of Results
chemical_list: D007605:Juvenile Hormones; D008041:Linoleic Acids; C005575:methyl linoleate