title: Rhythms and synchronization patterns in gene expression in the Aedes aegypti mosquito.
abstract: BACKGROUND
  Aedes aegypti is arguably the most studied of all mosquito species in the laboratory and is the primary vector of both Dengue and Yellow Fever flaviviruses in the field. A large number of transcriptional studies have been made in the species and these usually report transcript quantities observed at a certain age or stage of development. However, circadian oscillation is an important characteristic of gene expression in many animals and plants, modulating both their physiology and behavior. Circadian gene expression in mosquito species has been previously reported but for only a few genes directly involved in the function of the molecular clock.
  
  
  RESULTS
  Herein we analyze the transcription profiles of 21,494 messenger RNAs using an Ae. aegypti Agilent® microarray. Transcripts were quantified in adult female heads at 24 hours and then again at 72 hours and eight subsequent time points spaced four hours apart. We document circadian rhythms in multiple molecular pathways essential for growth, development, immune response, detoxification/pesticide resistance. Circadian rhythms were also noted in ribosomal protein genes used for normalization in reverse transcribed PCR (RT-PCR) to determine transcript abundance. We report pervasive oscillations and intricate synchronization patterns relevant to all known biological pathways.
  
  
  CONCLUSIONS
  These results argue strongly that transcriptional analyses either need to be made over time periods rather than confining analyses to a single time point or development stage or exceptional care needs to be made to synchronize all mosquitoes to be analyzed and compared among treatment groups.
authors.affiliation: Center for Bioinformatics, Colorado State University, Fort Collins, CO 80525, USA.
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Ptitsyn
authors.forename: Guadalupe
authors.initials: G
authors.lastname: Reyes-Solis
authors.forename: Karla
authors.initials: K
authors.lastname: Saavedra-Rodriguez
authors.forename: Jonathan
authors.initials: J
authors.lastname: Betz
authors.forename: Erica L
authors.initials: EL
authors.lastname: Suchman
authors.forename: Jonathan O
authors.initials: JO
authors.lastname: Carlson
authors.forename: William C
authors.initials: WC
authors.lastname: Black
mesh_terms: D000330:Aedes / Q000235:genetics*; D000818:Animals; D057906:Circadian Clocks / Q000235:genetics*; D005260:Female; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D017344:Genes, Insect; D006257:Head; D020411:Oligonucleotide Array Sequence Analysis; D012333:RNA, Messenger / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D012333:RNA, Messenger