title: Heat shock protein 70 gene family in the Glanville fritillary butterfly and their response to thermal stress.
abstract: Temperature variation in the environment is a great challenge to organisms. Induction of heat shock protein 70 (HSP70) is a common genetic mechanism to cope with thermal stress. The Glanville fritillary butterfly (Melitaea cinxia) is a model species in population and evolutionary biology, and its behavior and life history are greatly influenced by ambient temperature. We cloned and sequenced the full coding sequences of seven hsp70 genes from the Glanville fritillary. Of those genes, McHsc70-1 and McHsc70-2 were identified as heat shock cognate 70 (hsc70), of which the latter located in endoplasmic reticulum. We analyzed the expression patterns of different hsp70s under various thermal stresses using quantitative PCR. Heat shock at 40°C for 2h induced high expression of McHsp70-1, McHsp70-2 and McHsc70-2. Only McHsc70-2 had a small increase after cold shock at 0°C for 2h. Acclimation at 35°C for three days before heat shock reduced expression of McHsp70 after heat shock. The maximum mRNA level of McHsp70s was reached in the first 2h after the heat shock. This study uncovers the complexity of the hsp70 system, and provides the valuable information for further temperature-related research in the Glanville fritillary butterfly.
authors.affiliation: College of Life Science, Peking University, Beijing 100871, PR China.
authors.forename: Shiqi
authors.initials: S
authors.lastname: Luo
authors.affiliation: Department of Biosciences, University of Helsinki, FI-00014, Finland.
authors.forename: Virpi
authors.initials: V
authors.lastname: Ahola
authors.affiliation: College of Life Science, Peking University, Beijing 100871, PR China.
authors.forename: Chang
authors.initials: C
authors.lastname: Shu
authors.affiliation: College of Life Science, Peking University, Beijing 100871, PR China. Electronic address: xchr@pku.edu.cn.
authors.forename: Chongren
authors.initials: C
authors.lastname: Xu
authors.affiliation: College of Life Science, Peking University, Beijing 100871, PR China. Electronic address: rjwang@pku.edu.cn.
authors.forename: Rongjiang
authors.initials: R
authors.lastname: Wang
mesh_terms: D000818:Animals; D002080:Butterflies / Q000166:cytology / Q000378:metabolism*; D004721:Endoplasmic Reticulum / Q000378:metabolism; D005786:Gene Expression Regulation; D018840:HSP70 Heat-Shock Proteins / Q000235:genetics* / Q000378:metabolism; D019476:Insect Proteins / Q000235:genetics* / Q000378:metabolism; D005810:Multigene Family; D010802:Phylogeny; D016415:Sequence Alignment; D013312:Stress, Physiological; D013696:Temperature
chemical_list: D018840:HSP70 Heat-Shock Proteins; D019476:Insect Proteins
keywords: Acclimation; Glanville fritillary; Hsp70; Thermal stress