PCB126 exposure induced DNA methylation and gene expression changes in adult zebrafish testis
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ABSTRACT:
PROVIDER: PRJNA788302 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR17210900_1.fastq.gz | Fastqsanger.gz | |||
| SRR17210900_2.fastq.gz | Fastqsanger.gz | |||
| SRR17210901_1.fastq.gz | Fastqsanger.gz | |||
| SRR17210901_2.fastq.gz | Fastqsanger.gz | |||
| SRR17210902_1.fastq.gz | Fastqsanger.gz |
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Project description:The objective of this study is to determine the effects of pre-conceptional exposure to environmental chemicals on DNA methylation and gene expression in testis. We used a dioxin-like PCB (3, 3’, 4, 4’, 5-pentachlorobiphenyl; PCB126) as a model environmental chemical because the mechanism of action is well-characterized, involving activation of aryl hydrocarbon receptor, a ligand-activated transcription factor. Adult zebrafish were exposed to 3 and 10 nM PCB126 for 24 h (water-borne exposure) and testis tissue was sampled at 7 days post-exposure for histology, DNA methylation and gene expression profiling. We used enhanced Reduced Representation Bisulfite Sequencing (RRBS) and RNAseq to quantify DNA methylation and gene expression, respectively. RRBS revealed 37 and 92 differentially methylated regions (DMRs) in response to 3 and 10nM PCB126 exposures, respectively. We observed 19 DMRs to be common between the two PCB126 treatment groups. Among them 14 and 5 are hypomethylated and hypermethylated, respectively. Majority of these DMRs are hypomethylated and gene ontology analysis revealed that these regions are regulate genes associated with RNA processing, nucleoside metabolic process, iron-sulfur cluster assembly and gluconeogenesis. Dysregulation of all these pathways have been associated with spermatogenic defects such as infertility. RNAseq results revealed differential expression of genes related to xenobiotic metabolism, oxidative stress and immune function. There was very little correlation between differentially methylated regions and differentially expressed genes suggesting complex and multiple layers of regulation. Overall, the results from this study provide new understanding about the mechanisms of action of dioxin-like PCBs in affecting testicular function and potential multigenerational phenotypes.
2021-12-15 | GSE190741 | GEO
Project description:There is growing evidence from epidemiological and experimental studies suggesting that early life exposure to environmental chemicals can have long-term consequences that are seen in adults and not apparent early in life. We recently demonstrated that developmental exposure of zebrafish embryos to low, non-embryotoxic levels of PCB126 did not affect larval behavior but caused changes in adult behavior (Glazer et al., 2016, NeuroToxicology 52:134-143). Zebrafish embryos were exposed to either vehicle (DMSO) or low concentrations of PCB126 (0.3, 0.6, 1.2 nM) for 20 h (4–24 h post fertilization), and then reared to adulthood in clean water. Locomotor activity of the larvae at 7 and 14 days post fertilization (dpf) was not affected by PCB126. In contrast, adult fish (4 months old) tested in novel tank and shoaling assays showed impaired habituation to a novel environment. In order to investigate the underlying molecular basis of these phenotypes, we determined the transcriptional profiles in whole embryos (48 hpf), larvae (5 dpf) and adult brain (4 mo) using strand-specific RNA-sequencing. Our results show that 0.3 nM PCB126 exposure induced cyp1a transcript levels 12.5-fold in 48-hpf embryos but there was no induction in 5-dpf larvae, suggesting transient activation of aryl hydrocarbon receptor during early development. No significant induction of cyp1a was observed in the brains of adults exposed as embryos to PCB126. However, we observed significant changes in gene expression profiles in the adult brain samples. A total of 2209 and 1628 genes were differentially expressed in 0.3 nM and 1.2 nM PCB126-exposed groups, respectively. KEGG pathway analysis of differentially expressed genes in the brain suggest enrichment of genes involved in oxidative phosphorylation, neurodegenerative diseases, circadian rhythm and calcium signaling pathways. We are currently investigating the role of these genes in altered behavior observed in the adults. Overall, our results suggest that PCB exposure during sensitive periods of early development alters normal development of the brain by reprogramming gene expression patterns. [Funded by NIH P01ES021923 and NSF OCE-1314642].
2017-08-10 | GSE98741 | GEO
Project description:The aryl hydrocarbon receptor (AHR) is a ligand-activated transcription factor well known for mediating the toxicity of environmental chemicals such as polychlorinated biphenyls (PCBs) and polyaromatic hydrocarbons (PAHs). There is extensive knowledge on the range of target genes regulated by AHR ligands. However, there is limited information on the effect of AHR ligands on DNA methylation. The objective of this study is to investigate genome-wide changes in DNA methylation and gene expression patterns in response to PCB126 exposure. Adult zebrafish were exposed to 10 nM PCB126 for 24 hours (waterborne exposure) and were reared in clean water for 7 days before tissue sampling. DNA methylation and transcriptional changes in the liver and brain tissues were quantified by Reduced Representation Bisulfite Sequencing (RRBS) and RNAseq, respectively. RRBS analysis revealed DNA hypomethylation in response to PCB exposure in both liver and brain tissues. We observed 482 and 476 differentially methylated regions (DMRs) in the liver and brain tissues respectively. Most of the DMRs are located more than 20 kilobases upstream of the transcriptional start sites. RNAseq results from the liver revealed differential expression of genes related to xenobiotic metabolism, oxidative stress and carbohydrate metabolism in response to PCB exposure. In the brain, PCB exposure altered the expression of genes involved in myelination and glutamate signaling. Our results suggest that there is very little correlation between DNA methylation and gene expression patterns among the differentially expressed genes (DEGs). We are currently investigating the relationship between DMRs and DEGs.
2017-09-30 | GSE104221 | GEO
Project description:Integrative analysis of transcriptional and DNA methylation changes associated with PCB126 exposure in adult zebrafish (Danio rerio)
| PRJNA412050 | ENA
Project description:Chemical modifications of proteins, DNA and RNA moieties play critical roles in regulating gene expression. Emerging evidence suggests these RNA modifications (epitranscriptomics) have substantive roles in basic biological processes. One of the most common modifications in mRNA and noncoding RNAs is N6-methyladenosine (m6A). In a subset of mammalian mRNAs, m6A sites are preferentially enriched near stop codons, in 3′ UTRs, and within exons, suggesting an important role in the regulation of mRNA processing and function including alternative splicing and gene expression. Very little is known about the effect of environmental chemical exposure on m6A modifications. As many of the commonly occurring environmental contaminants alter gene expression profiles and have detrimental effects on physiological processes, it is important to understand the effects of exposure on this important layer of gene regulation. Hence, the objective of this study was to characterize the acute effects of developmental exposure to PCB126, an environmentally relevant dioxin-like PCB, on m6A methylation patterns. We exposed zebrafish embryos to PCB126 for 6 hours starting from 72 hours post-fertilization and profiled m6A RNA using methylated RNA immunoprecipitation followed by sequencing (MeRIP-seq), as well as assessing changes in mRNA splicing. We observed several hundreds of peaks that are differentially expressed in response to PCB126 exposure (FDR 5%). The majority of the peaks are preferentially located around the 3’UTR and stop codons. Pathway analysis of m6A marked transcripts induced by PCB126 exposure revealed that these transcripts are associated with important developmental pathways (MAPK, Hedgehog, Notch and Wnt). These results suggest that PCB126 could affect developmental gene expression patterns by altering m6A levels. Gene expression analysis revealed upregulation of classical aryl hydrocarbon receptor (AHR) target genes such as cytochrome P450s in response to PCB126 exposure. Interestingly, none of the AHR target genes overlapped with the m6A altered transcripts, suggesting that xenobiotic metabolism may not be under m6A regulation. Further studies are necessary to understand the functional consequences of exposure-associated alterations in m6A levels. This work is supported by NIEHS ES024915.
2020-06-29 | GSE153436 | GEO
Project description:Exposure to environmental toxicants during preconception has been shown to affect offspring health and epigenetic mechanisms such as DNA methylation are hypothesized to be involved in adverse outcomes. However, studies addressing the effects of exposure to environmental toxicants during preconception on epigenetic changes in gametes are limited. The objective of this study is to determine the effect of preconceptional exposure to a dioxin-like polychlorinated biphenyl (3,3',4,4',5-pentachlorobiphenyl [PCB126]) on DNA methylation and gene expression in testis. Adult zebrafish were exposed to 3 and 10 nM PCB126 for 24 h and testis tissue was sampled at 7 days postexposure for histology, DNA methylation, and gene expression profiling. Reduced representation bisulfite sequencing revealed 37 and 92 differentially methylated regions (DMRs) in response to 3 and 10 nM PCB126 exposures, respectively. Among them, 19 DMRs were found to be common between both PCB126 treatment groups. Gene ontology (GO) analysis of DMRs revealed that enrichment of terms such as RNA processing, iron-sulfur cluster assembly, and gluconeogenesis. Gene expression profiling showed differential expression of 40 and 1621 genes in response to 3 and 10 nM PCB126 exposures, respectively. GO analysis of differentially expressed genes revealed enrichment of terms related to xenobiotic metabolism, oxidative stress, and immune function. There is no overlap in the GO terms or individual genes between DNA methylation and RNA sequencing results, but functionally many of the altered pathways have been shown to cause spermatogenic defects.
| S-EPMC9237993 | biostudies-literature
Project description:Polychlorinated biphenyls (PCBs) are ubiquitous and representative pollutants that pose great health risks. While cells' responses to dioxin-like PCBs tend to be studied on a bulk scale, few studies have been made from a single-cell level. Here, by using single-cell RNA sequencing, we depicted a detailed landscape of hepatic nonparenchymal cells' intricate responses to PCB126 exposure. A total of 13 clusters were identified. Notably, PCB126 exposure resulted in cell-type-specific gene expression profiles and genetic pathways. By analyzing genes related to aryl hydrocarbon receptors, we discovered that PCB126 induced the canonical genomic AhR pathway mainly in endothelial cells. In contrast, other cell types showed little induction. Enrichment pathway analysis indicated that immune cells changed their transcriptional patterns in response to PCB126. ScRNA-seq is a powerful tool to dissect underlying mechanisms of chemical toxicity regarding biological heterogeneity. Taken together, our study not only extends our current understanding of PCB126 toxicity, but also emphasizes the importance of in vivo cell heterogeneity in environmental toxicology.
2023-02-11 | GSE190084 | GEO
Project description:We report the RNAseq-based transcriptome profiles of adult male rat liver and testis following 14 day exposure to myclobutanil. A treatment-related change in mRNA levels were observed in both liver and testis.
2020-12-15 | GSE139098 | GEO
Project description:Goal of this study is the gene expression analysis of the zebrafish adult germline (ovary, oocyte, testis)
2018-09-07 | GSE111882 | GEO
Project description:miRNA seq mouse liver HFD, PCB126, Aroclor1260 exposure
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