Transgenerational epigenetic and transcriptomic effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin exposure in rat

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Prokopec , S D , Viluksela , M , Miettinen , H M , Boutros , P C & Pohjanvirta , R 2020 , ' Transgenerational epigenetic and transcriptomic effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin exposure in rat ' , Archives of Toxicology , vol. 94 , no. 5 , pp. 1613-1624 . https://doi.org/10.1007/s00204-020-02730-5

Title: Transgenerational epigenetic and transcriptomic effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin exposure in rat
Author: Prokopec, Stephenie D.; Viluksela, Matti; Miettinen, Hanna M.; Boutros, Paul C.; Pohjanvirta, Raimo
Contributor: University of Helsinki, Food Hygiene and Environmental Health
Date: 2020-05
Language: eng
Number of pages: 12
Belongs to series: Archives of Toxicology
ISSN: 0340-5761
URI: http://hdl.handle.net/10138/329570
Abstract: In rats, direct exposure to TCDD causes myriad toxicities. Exposed rats experience hepatotoxicity, wasting syndrome and immune suppression, amongst others. "Inherited exposure", as occurs in the F3 generation of directly exposed F0 animals, has also been shown to cause toxicity: both male and female F3 rats demonstrate an increased incidence of adult onset disease, females also display reproductive abnormalities and increased incidence of ovarian diseases while males show increased incidence of kidney disease and an altered sperm epigenome. Here, we explore the hepatic transcriptomic profile of male and female F3 Sprague-Dawley rats bred through the paternal germ line from F0 dams exposed to a single dose of TCDD (0, 30, 100, 300 or 1000 ng/kg body weight) by oral gavage. We hypothesize that RNA transcripts with altered abundance in livers of unexposed F3 progeny of treated F0 Sprague-Dawley rats may result from epigenetic modifications to the genome. We further survey patterns of differential methylation within male F3 rat testis. Female F3 rats demonstrated more TCDD-mediated hepatic transcriptomic changes than males, with differences primarily in the lowest dose group. In testis from male F3 rats, multiple olfactory receptors displayed patterns of differential methylation. Hypermethylation of Egfr and Mc5r among testes from TCDD lineage rats was observed, but without corresponding changes in hepatic mRNA abundance. Further studies examining these differences in other tissue types are warranted.
Subject: 2,3,7,8-Tetrachlorodibenzo-p-dixoin (TCDD)
Sprague-Dawley rat
Transgenerational inheritance
Transcriptome
Differential methylation
ARYL-HYDROCARBON RECEPTOR
MESSENGER-RNA EXPRESSION
SPRAGUE-DAWLEY RATS
CARBOXYPEPTIDASE A4
MELANOCORTIN RECEPTORS
TOXICOGENOMIC ANALYSIS
DOWN-REGULATION
AGENT-ORANGE
TCDD
DIOXIN
1182 Biochemistry, cell and molecular biology
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