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Functional analysis of Grp and Iris, the gag and env domesticated errantivirus genes, in the Drosophila melanogaster genome

  • Genomics. Transcriptomics
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Abstract

Drosophila melanogaster is the only invertebrate that contains endogenous retroviruses, which are called errantiviruses. Two domesticated genes, Grp and Iris, which originate from errantivirus gag and env, respectively, have been found in the D. melanogaster genome. The functions performed by the genes in Drosophila are still unclear. To identify the functions of domesticated gag and env in the D. melanogaster genome, expression of Iris and Grp was studied in strains differing by the presence or absence of the functional gypsy errantivirus. In addition, the expression levels were measured after injection of gram-positive and gram-negative bacteria, which activate different immune response pathways, and exposure to various abiotic stress factors. The presence of functional D. melanogaster retrovirus gypsy was found to increase the Grp expression level in somatic tissues of the carcass, while exerting no effect on the Iris expression level. Activation of the immune response in D. melanogaster by bacteria Bacillus cereus increased the Grp expression level and did not affect Iris expression. As for the effects of abiotic stress factors (oxidative stress, starvation, and heat and cold stress), the Grp expression level increased in response to starvation in D. melanogaster females, and the Iris expression level was downregulated in heat shock and oxidative stress. Based on the findings, Grp was assumed to play a direct role in the immune response in D. melanogaster; Iris is not involved in immune responses, but and apparently performs a cell function that is inhibited in stress.

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Abbreviations

LTR:

long terminal repeat

EPR:

endoplasmic reticulum

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Authors and Affiliations

  1. Biological Faculty, Moscow State University, Moscow, 119234, Russia

    P. A. Makhnovskii, I. V. Kuzmin, L. N. Nefedova & A. I. Kima

  2. Institute of Medico-Biological Problems, Russian Academy of Sciences, Moscow, 123007, Russia

    I. V. Kuzmin

Authors
  1. P. A. Makhnovskii
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  2. I. V. Kuzmin
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  3. L. N. Nefedova
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  4. A. I. Kima
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Correspondence to A. I. Kima.

Additional information

Original Russian Text © P.A. Makhnovskii, I.V. Kuzmin, L.N. Nefedova, A.I. Kim, 2016, published in Molekulyarnaya Biologiya, 2016, Vol. 50, No. 3, pp. 435–444.

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Makhnovskii, P.A., Kuzmin, I.V., Nefedova, L.N. et al. Functional analysis of Grp and Iris, the gag and env domesticated errantivirus genes, in the Drosophila melanogaster genome. Mol Biol 50, 379–386 (2016). https://doi.org/10.1134/S0026893316020151

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  • DOI: https://doi.org/10.1134/S0026893316020151

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