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Hsp70 affects memory formation and behaviorally relevant gene expression in Drosophila melanogaster

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Cell Stress and Chaperones Aims and scope

Abstract

Heat shock proteins, in particular Hsp70, play a central role in proteostasis in eukaryotic cells. Due to its chaperone properties, Hsp70 is involved in various processes after stress and under normal physiological conditions. In contrast to mammals and many Diptera species, inducible members of the Hsp70 family in Drosophila are constitutively synthesized at a low level and undergo dramatic induction after temperature elevation or other forms of stress. In the courtship suppression paradigm used in this study, Drosophila males that have been repeatedly rejected by mated females during courtship are less likely than naive males to court other females. Although numerous genes with known function were identified to play important roles in long-term memory, there is, to the best of our knowledge, no direct evidence implicating Hsp70 in this process. To elucidate a possible role of Hsp70 in memory formation, we used D. melanogaster strains containing different hsp70 copy numbers, including strains carrying a deletion of all six hsp70 genes. Our investigations exploring the memory of courtship rejection paradigm demonstrated that a low constitutive level of Hsp70 is apparently required for learning and the formation of short and long-term memories in males. The performed transcriptomic studies demonstrate that males with different hsp70 copy numbers differ significantly in the expression of a few definite groups of genes involved in mating, reproduction, and immunity in response to rejection. Specifically, our analysis reveals several major pathways that depend on the presence of hsp70 in the genome and participate in memory formation and consolidation, including the cAMP signaling cascade.

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Acknowledgements

The bioinformatics was performed using the computational facilities of Engelhardt Institute of Molecular Biology RAS Genome center (http://www.eimb.ru/rus/ckp/ccu_genome_c.php).

Availability of data and material

Sequence data were deposited in the NCBI GEO database under the number GSE152647.

Funding

All genetic and behavioral experiments were supported by the Russian Foundation for Basic Research grant no. 18-04-00865 (to O.Z.). Transcriptomic studies were funded by Russian Science Foundation Grant 17-74-30030 to M.E.

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Study conception and design were performed by (Evgen’ev M.B., Zatsepina O.G., Nikitina E.A.). Material preparation, data collection, and analysis were performed by (Shilova V.Y., Chuvakova L.N., Sorokina S., Tokmacheva E.V.). Libraries for RNA-seq were prepared by (Chuvakova L.N., Funikov S.Y.). Differential gene expression analysis was performed by (Rezvykh A.P.). Construction of Elav GFP/FM7; Hsp70-/Hsp70- strain for confocal analysis was done by Vorontsova J.E. The first draft of the manuscript was written by (Zatsepina O.G., Nikitina E.A., Evgen’ev M.B.). All authors read and approved the final manuscript.

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Correspondence to M. B. Evgen’ev.

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Zatsepina, O.G., Nikitina, E.A., Shilova, V.Y. et al. Hsp70 affects memory formation and behaviorally relevant gene expression in Drosophila melanogaster. Cell Stress and Chaperones 26, 575–594 (2021). https://doi.org/10.1007/s12192-021-01203-7

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  • DOI: https://doi.org/10.1007/s12192-021-01203-7

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