Abstract
Mitochondria play a central role in maintaining cellular and metabolic homeostasis during vital development cycles of foetal growth. Optimal mitochondrial functions are important not only to sustain adequate energy production but also for regulated epigenetic programming. However, these organelles are subtle targets of environmental exposures, and any perturbance in the defined mitochondrial machinery during the developmental stage can lead to the re-programming of the foetal epigenetic landscape. As these modifications can be transferred to subsequent generations, we herein performed a cross-sectional study to have an in-depth understanding of this intricate phenomenon. The study was conducted with two arms: whereas the first group consisted of in utero pro-oxidant exposed individuals and the second group included controls. Our results showed higher levels of oxidative mtDNA damage and associated integrated stress response among the exposed individuals. These disturbances were found to be closely related to the observed discrepancies in mitochondrial biogenesis. The exposed group showed mtDNA hypermethylation and changes in allied mitochondrial functioning. Altered expression of mitomiRs and their respective target genes in the exposed group indicated the possibilities of a disturbed mitochondrial-nuclear cross talk. This was further confirmed by the modified activity of the mitochondrial stress regulators and pro-inflammatory mediators among the exposed group. Importantly, the disturbed DNMT functioning, hypermethylation of nuclear DNA, and higher degree of post-translational histone modifications established the existence of aberrant epigenetic modifications in the exposed individuals. Overall, our results demonstrate the first molecular insights of in utero pro-oxidant exposure associated changes in the mitochondrial-epigenetic axis. Although, our study might not cement an exposure-response relationship for any particular environmental pro-oxidant, but suffice to establish a dogma of mito-epigenetic reprogramming at intrauterine milieu with chronic illness, a hitherto unreported interaction.
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The technical assistance received from Ms. Anju Chouksey and Mr. Pushpendra Kumar Gupta for sample collection and processing is acknowledged.
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PKM received financial support from the Indian Council of Medical Research (ICMR), Department of Health Research (DHR), Ministry of Health and Family Welfare (MoHFW), Government of India, New Delhi(Project ID: 65/1/PM/NIREH/2016-NCD-II). RK also received Senior Research Fellowship from ICMR.
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Pradyumna Kumar Mishra: conceptualization, supervision, project administration, funding acquisition, resources, writing-original draft preparation. Roshani Kumari: investigation, visualization, formal analysis. Arpit Bhargava: Writing-original draft preparation, investigation, formal analysis. Neha Bunkar: investigation, visualization. Prachi Chauhan: visualization, investigation. Rajnarayan Tiwari: writing-reviewing and editing, formal analysis. Ruchita Shandilya: investigation, formal analysis. Rupesh Kumar Srivastava: writing-reviewing and editing, formal analysis. Radha Dutt Singh: writing-reviewing and editing, investigation. All authors read and approved the manuscript.
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Mishra, P.K., Kumari, R., Bhargava, A. et al. Prenatal exposure to environmental pro-oxidants induces mitochondria-mediated epigenetic changes: a cross-sectional pilot study. Environ Sci Pollut Res 29, 74133–74149 (2022). https://doi.org/10.1007/s11356-022-21059-3
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DOI: https://doi.org/10.1007/s11356-022-21059-3