Cyst viability and stress tolerance upon heat shock protein 70 knockdown in the brine shrimp Artemia franciscana
Females of the brine shrimp Artemia franciscana produce either free-swimming nauplii via ovoviviparous pathway of reproductionorencystedembryos,knownascysts,viaoviparouspathway,inwhichbiologicalprocessesarearrested.Whileprevious study has shown a crucial role of ATP-dependent molecular chaperone, he...
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| Summary: | Females of the brine shrimp Artemia franciscana produce either free-swimming nauplii via ovoviviparous pathway of reproductionorencystedembryos,knownascysts,viaoviparouspathway,inwhichbiologicalprocessesarearrested.Whileprevious study has shown a crucial role of ATP-dependent molecular chaperone, heat shock protein 70 (Hsp70) in protecting A. franciscana nauplii against various abiotic and abiotic stressors, the function of this protein in diapausing embryos and cyst development, however, remains unknown. RNA interference (RNAi) was applied in this study to examine the role of Hsp70 in cystdevelopmentandstresstolerance,withthelatterperformedbydesiccationandfreezing,acommonmethodusedfordiapause termination in Artemia cysts. Hsp70 knockdown was apparent in cysts released from females that were injected with Hsp70 dsRNA.ThelossofHsp70affectedneitherthedevelopmentnormorphologyofthecysts.Thetimebetweenfertilizationandcyst release from Artemia females injected with Hsp70 dsRNAwas delayed slightly, but the differences were not significant when comparedtothecontrols.However,thehatchingpercentageofcystswhichlacksHsp70werereducedfollowingdesiccationand freezing.Takentogether,theseresultsindicatedthatHsp70possiblyplaysaroleinthestresstolerancebutnotinthedevelopment of diapause-destined embryos of Artemia. This research makes fundamental contributions to our understanding of the role molecular chaperone Hsp70 plays in Artemia, an excellent model organism for diapause studies of the crustaceans. |
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