scholarly journals A test of maternal programming of offspring stress response to predation risk in threespine sticklebacks

2013 ◽  
Vol 122 ◽  
pp. 222-227 ◽  
Author(s):  
Brett C. Mommer ◽  
Alison M. Bell
Keyword(s):  
Stress Response ◽  
Predation Risk ◽  
Maternal Programming ◽  
Threespine Sticklebacks

Experimental increase in predation risk causes a cascading stress response in free-ranging snowshoe hares

Oecologia ◽  
2019 ◽  
Vol 191 (2) ◽  
pp. 311-323 ◽  
Author(s):  
Melanie R. Boudreau ◽  
Jacob L. Seguin ◽  
Rudy Boonstra ◽  
Rupert Palme ◽  
Stan Boutin ◽  
...  
Keyword(s):  
Stress Response ◽  
Predation Risk ◽  
Snowshoe Hares ◽  
Free Ranging

scholarly journals Predation risk and the evolution of a vertebrate stress response: parallel evolution of stress reactivity and sexual dimorphism

2021 ◽  
Author(s):  
Jerker Vinterstare ◽  
Gustaf MO Ekelund Ugge ◽  
Kaj Hulthén ◽  
Alexander Hegg ◽  
Christer Brönmark ◽  
...  
Keyword(s):  
Sexual Dimorphism ◽  
Stress Response ◽  
Predation Risk ◽  
Stress Reactivity ◽  
Parallel Evolution

scholarly journals Predator experience overrides learned aversion to heterospecifics in stickleback species pairs

2015 ◽  
Vol 282 (1805) ◽  
pp. 20143066 ◽  
Author(s):  
Genevieve M. Kozak ◽  
Janette W. Boughman
Keyword(s):  
Predation Risk ◽  
Cognitive Processes ◽  
Sexual Isolation ◽  
Female Preferences ◽  
Species Pairs ◽  
Learned Aversion ◽  
Before And After ◽  
Threespine Sticklebacks ◽  
Female Choosiness ◽  
Predator Effects

Predation risk can alter female mating decisions because the costs of mate searching and selecting attractive mates increase when predators are present. In response to predators, females have been found to plastically adjust mate preference within species, but little is known about how predators alter sexual isolation and hybridization among species. We tested the effects of predator exposure on sexual isolation between benthic and limnetic threespine sticklebacks ( Gasterosteus spp.). Female discrimination against heterospecific mates was measured before and after females experienced a simulated attack by a trout predator or a control exposure to a harmless object. In the absence of predators, females showed increased aversion to heterospecifics over time. We found that predator exposure made females less discriminating and precluded this learned aversion to heterospecifics. Benthic and limnetic males differ in coloration, and predator exposure also affected sexual isolation by weakening female preferences for colourful males. Predator effects on sexual selection were also tested but predators had few effects on female choosiness among conspecific mates. Our results suggest that predation risk may disrupt the cognitive processes associated with mate choice and lead to fluctuations in the strength of sexual isolation between species.

The ghosts of predators past: population cycles and the role of maternal programming under fluctuating predation risk

Ecology ◽  
2010 ◽  
Vol 91 (10) ◽  
pp. 2983-2994 ◽  
Author(s):  
Michael J. Sheriff ◽  
Charles J. Krebs ◽  
Rudy Boonstra
Keyword(s):  
Predation Risk ◽  
Population Cycles ◽  
Maternal Programming ◽  
Past Population

CarR, a MarR-family regulator from Corynebacterium glutamicum, modulated antibiotic and aromatic compound resistance

2019 ◽  
Vol 476 (21) ◽  
pp. 3141-3159 ◽  
Author(s):  
Meiru Si ◽  
Can Chen ◽  
Zengfan Wei ◽  
Zhijin Gong ◽  
GuiZhi Li ◽  
...  
Keyword(s):  
Stress Response ◽  
Ligand Binding ◽  
Corynebacterium Glutamicum ◽  
Conformational Changes ◽  
Cysteine Oxidation ◽  
Transcriptional Regulatory ◽  
Ligand Free ◽  
Redox Sensing

Abstract MarR (multiple antibiotic resistance regulator) proteins are a family of transcriptional regulators that is prevalent in Corynebacterium glutamicum. Understanding the physiological and biochemical function of MarR homologs in C. glutamicum has focused on cysteine oxidation-based redox-sensing and substrate metabolism-involving regulators. In this study, we characterized the stress-related ligand-binding functions of the C. glutamicum MarR-type regulator CarR (C. glutamicum antibiotic-responding regulator). We demonstrate that CarR negatively regulates the expression of the carR (ncgl2886)–uspA (ncgl2887) operon and the adjacent, oppositely oriented gene ncgl2885, encoding the hypothetical deacylase DecE. We also show that CarR directly activates transcription of the ncgl2882–ncgl2884 operon, encoding the peptidoglycan synthesis operon (PSO) located upstream of carR in the opposite orientation. The addition of stress-associated ligands such as penicillin and streptomycin induced carR, uspA, decE, and PSO expression in vivo, as well as attenuated binding of CarR to operator DNA in vitro. Importantly, stress response-induced up-regulation of carR, uspA, and PSO gene expression correlated with cell resistance to β-lactam antibiotics and aromatic compounds. Six highly conserved residues in CarR were found to strongly influence its ligand binding and transcriptional regulatory properties. Collectively, the results indicate that the ligand binding of CarR induces its dissociation from the carR–uspA promoter to derepress carR and uspA transcription. Ligand-free CarR also activates PSO expression, which in turn contributes to C. glutamicum stress resistance. The outcomes indicate that the stress response mechanism of CarR in C. glutamicum occurs via ligand-induced conformational changes to the protein, not via cysteine oxidation-based thiol modifications.

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