title: Maternal low-protein diet affects epigenetic regulation of hepatic mitochondrial DNA transcription in a sex-specific manner in newborn piglets associated with GR binding to its promoter.
abstract: Mitochondrial oxidative phosphorylation (OXPHOS) plays an important role in energy homeostasis by controlling electron transfer and ATP generation. Maternal malnutrition during pregnancy affects mitochondrial (mt) DNA-encoded OXPHOS activity in offspring, yet it is unknown whether epigenetic mechanism is involved in the transcriptional regulation of mtDNA-encoded OXPHOS genes. In this study, 14 primiparous purebred Meishan sows were fed either standard- (SP, 12% crude protein) or low-protein (LP; 6% crude protein) diets throughout gestation, and the hepatic expression and transcriptional regulation of mtDNA-encoded OXPHOS genes were analyzed in newborn piglets. Maternal low protein diet decreased hepatic mtDNA copy number in males, but not in females. LP male piglets had significantly higher hepatic AMP concentration and low energy charge, which was accompanied by enhanced mRNA expression of NADH dehydrogenase subunits 6, cytochrome c oxidase subunit 1, 2, 3 and cytochrome b, as well as increased cytochrome c oxidase enzyme activity. In contrast, LP female piglets showed significantly lower hepatic AMP concentrations and higher energy charge with no alterations in OXPHOS gene expression. Moreover, LP males demonstrated higher glucocorticoid receptor (GR) binding to the mtDNA promoter compared with SP males, which was accompanied by lower cytosine methylation and hydroxymethylation on mtDNA promoter. Interestingly, opposite changes were seen in females, which showed diminished GR binding and enriched cytosine methylation and hydroxymethylation on mtDNA promoter. These results suggest that maternal low protein diet during pregnancy causes sex-dependent epigenetic alterations in mtDNA-encoded OXPHOS gene expression, possibly GR is involved in mtDNA transcription regulation.
authors.affiliation: Key Laboratory of Animal Physiology and Biochemistry, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, Jiangsu, China.
authors.forename: Yimin
authors.initials: Y
authors.lastname: Jia
authors.forename: Runsheng
authors.initials: R
authors.lastname: Li
authors.forename: Rihua
authors.initials: R
authors.lastname: Cong
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Yang
authors.forename: Qinwei
authors.initials: Q
authors.lastname: Sun
authors.forename: Nahid
authors.initials: N
authors.lastname: Parvizi
authors.forename: Ruqian
authors.initials: R
authors.lastname: Zhao
mesh_terms: D044503:5-Methylcytosine / Q000378:metabolism / Q000031:analogs & derivatives; D000818:Animals; D000831:Animals, Newborn; D003596:Cytosine / Q000031:analogs & derivatives / Q000378:metabolism; D019175:DNA Methylation / Q000187:drug effects; D004272:DNA, Mitochondrial / Q000235:genetics*; D004044:Dietary Proteins / Q000494:pharmacology*; D003576:Electron Transport Complex IV / Q000235:genetics / Q000378:metabolism; D044127:Epigenesis, Genetic / Q000187:drug effects*; D005260:Female; D008099:Liver / Q000378:metabolism*; D008297:Male; D009035:Mothers; D011401:Promoter Regions, Genetic / Q000187:drug effects / Q000235:genetics; D011485:Protein Binding / Q000187:drug effects; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011965:Receptors, Glucocorticoid / Q000378:metabolism*; D012727:Sex Characteristics; D013552:Swine; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D004272:DNA, Mitochondrial; D004044:Dietary Proteins; D012333:RNA, Messenger; D011965:Receptors, Glucocorticoid; C011865:5-hydroxymethylcytosine; D044503:5-Methylcytosine; D003596:Cytosine; D003576:Electron Transport Complex IV