RF22 | PMON11 Non-coding RNA Signatures of Prenatal BPA Exposure in Liver and Muscle of Female Sheep
Authors: Saadat Nadia , Puttabyatappa Muraly , Elangovan Venkateswaran R , Dou John , Bakulski Kelly , Padmanabhan Vasantha 
Published: November 2022

Prenatal exposure to bisphenol-A (BPA), an ubiquitously present endocrine-disrupting chemicals, induces peripheral insulin resistance as well as lipotoxicity and oxidative stress in the liver and muscle along with tissue-specific transcriptional changes in female sheep. To gain a mechanistic understanding of contributors to these liver and muscle-specific transcriptional changes, we hypothesized that prenatal BPA exposure impacts non-coding RNA (ncRNA), regulators of transcriptional and post-transcriptional control of coding RNAs. We sequenced ncRNA (including lncRNA, microRNA, snoRNA, and snRNA) in the liver and muscle obtained during the late follicular phase from 21-month-old control and prenatal BPA-treated (0.5mg/kg/day from days 30 to 90 of gestation; Term: 147days) female sheep (n=4 control and 4 prenatal BPA treated). The sequence data were subjected to differential expression analysis and multivariate modeling to identify specific ncRNA signatures. In the liver, 77 lncRNA (49 down, 28 up), 14 microRNAs (6 down, 8 up), 127 snoRNAs (63 down, 64 up) and 55 snRNAs (15 down, 40 up) were dysregulated (FDR&lt;0.1, absolute log2FC&gt;0.5) with BPA exposure. In the muscle 6 lncRNA were upregulated and 65 snoRNAs (47 down, 18 up) were dysregulated (FDR&lt;0.1, absolute log2FC&gt;0.5). Orthogonal Projections to Latent Structures Discriminant Analysis (OPLS-DA) plots identified microRNAs MIR200B, MIR409, MIR30B, and MIR154A in the liver and miRNAs MIR26B, MIR29A, MIR125B, and MIR127 in muscle and several uncharacterized ncRNAs as signatures of prenatal BPA exposure. Multiple ncRNA signatures correlated with coding genes including LCORL, MED17, and ZNF41 in the liver, but none were correlated in the muscle. Among the coding genes which correlated with ncRNA, LCORL is reported to be related to steatosis of the liver in geese, a feature also observed in livers from prenatal BPA-treated female sheep. Since lipid accumulation in the liver may result from increased fatty acid biosynthesis, MED17 which is involved in transcriptional activation of lipogenic genes that correlated with multiple ncRNA in the liver may be a contributor to the steatosis observed in this model. In addition, MIR200B and MIR30B in the liver and MIR26B and MIR29A in the muscle are linked to lipid dysfunction, endoplasmic reticulum stress, and fibrosis. These findings provide mechanistic clues into the role of ncRNA in the prenatal BPA-induced lipid accumulation and oxidative stress in the liver and muscle, contributors to metabolic dysfunction observed in this female sheep model of gestational BPA exposure. In addition, findings from this precocial model of human translational relevance is a step towards gaining mechanistic insights in the programming of metabolic dysfunctions from environmental exposure to BPA, an endocrine disruptor of public health relevance.

Presentation: Sunday, June 12, 2022 1:06 p.m. - 1:11 p.m., Monday, June 13, 2022 12:30 p.m. - 2:30 p.m.