eISSN: 2221-6197 DOI: 10.31301/2221-6197

Effect of 20-Hydroxyecdysone and Sadenosylmethionine on the ecdysone receptor gene EcR transcriptional activity in housefly Musca domestica L.

Year: 2020

Pages: 480-491

Number: Volume 12, issue 4

Summary:

Steroid hormone 20-hydroxyecdysone (20E) initiates larval molting start and metamorphosis and regulates reproduction. Its basic receptor is heterodimer including proteins EcR and USP. Ecdysone receptor gene EcR coding protein EcR is a key regulatory element of gene circuits cover considerable part of genes, implicated in growth and development as well as in reproduction of progeny and reactions of organisms to unfavorable factors of environment. The source of methyl groups S-adenosylmethionine (SAM) is in use for biosynthesis of juvenile hormone (JH), methylation of histone proteins and DNA. The main aim of our investigation was evaluation of transcriptional activity of housefly Musca domestica ecdysone receptor gene EcR under adding into ration of 20E and SAM in non-lethal concentrations. Experiments were carried out with larvae and adults of housefly from laboratory strains Shgen and Lgen differ in life span of adults. Change of gene EcR transcripts content in common pool of mRNA in the cells of muscles and gonads, as well as DNA methylation level in 5’-terminal site registered by quantitative real time PCR (RT-PCR). The results of our investigations allow us to suggest existence of mechanism for regulating expression of the EcR gene in M. domestica which is sensitive to exogenic20E and heat stress action as well as to presence of SAM in food. Variations in the mRNA quantitative ratios of EcR gene 5’-and 3’-terminal regions depending on tissue type, gender and age support the hypothesis that this gene can encode several isoforms of the protein EcR. The detected changes in the status of DNA methylation in the 5'-terminal region of the gene and fluctuations in the representation of different mRNA sites after SAM processing suggest the involvement of DNA methylation/demethylation processes in the regulation of EcR gene expression in M. domestica.

Keywords:

Ecdysone receptor; Musca domestica; 20-hydroxyecdysone; S-adenosylmethionine; DNA methylation

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eISSN: 2221-6197 DOI: 10.31301/2221-6197