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Analysis of total RNA as a potential biomarker of developmental neurotoxicity in silico
1Department of Genetics, Faculty of Biology, University of Belgrade, Belgrade, Serbia.
Abstract:
A vast number of neurodegenerative disorders arise from neurotoxicity. In neurotoxicity, more than 250 RNA molecules are up and downregulated. The manuscript investigates the exposure of chlorpyrifos organophosphate pesticide (COP) effect on total RNA in murine brain tissue in 4 genotypes for in silico neurodegeneration development. The GSE58103 dataset from the Gene Expression Omnibus (GEO) database applies for data preprocessing, normalization, and quality control. Differential expression analysis (DEG) uses the limma package in R. Study compared expression profiles from murine fetal brain tissues across four genotypes: PON-1 knockout (KO), tgHuPON1Q192 (Q-tg), tgHuPON1R192 (R-tg), and wild-type (WT). We analyze 60 samples, 15 samples per genotype, to identify DEGs. The significance criteria are adjusted p-value <.05 and a |log2 fold change| > 1. The study identifies microRNA485 as the potential biomarker of COP toxicity using the GSE58103 dataset. Significant differences exist for microRNA485 between KO and WT groups by differential expression analysis. Moreover, graphical analysis shows sample relationships among genotype groups. MicroRNA485 represents a promising biomarker for developmental COP neurotoxicity by utilizing in silico analysis in scientific practice.
Insights
Chlorpyrifos pesticide exposure alters RNA in mouse brains, with microRNA485 identified as a potential biomarker for neurotoxicity. This finding aids in understanding developmental pesticide effects.
Area of Science:
- Neuroscience
- Toxicology
- Genomics
Background:
- Neurodegenerative disorders are frequently caused by neurotoxicity.
- Over 250 RNA molecules are dysregulated in neurotoxic conditions.
- Organophosphate pesticides, like chlorpyrifos, pose environmental and health risks.
Purpose of the Study:
- To investigate the impact of chlorpyrifos organophosphate pesticide (COP) exposure on total RNA expression in murine brain tissue.
- To identify potential RNA biomarkers for COP-induced neurotoxicity using in silico methods.
- To compare gene expression profiles across four distinct murine genotypes.
Main Methods:
- Utilized the GSE58103 dataset from the Gene Expression Omnibus (GEO) for data preprocessing and quality control.
- Performed differential expression analysis (DEG) using the limma package in R.
- Analyzed 60 samples from four genotypes (PON-1 knockout, tgHuPON1Q192, tgHuPON1R192, and wild-type) to identify differentially expressed genes (DEGs).
Main Results:
- Identified microRNA485 as a potential biomarker for COP toxicity.
- Observed significant differences in microRNA485 expression between knockout and wild-type groups.
- Differential expression analysis revealed significant DEGs based on adjusted p-value <.05 and |log2 fold change| > 1.
Conclusions:
- MicroRNA485 shows promise as a biomarker for developmental chlorpyrifos organophosphate pesticide neurotoxicity.
- In silico analysis of RNA expression provides valuable insights into neurodegeneration mechanisms.
- The study highlights the utility of utilizing publicly available datasets for neurotoxicity research.
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