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Reduced LINE-1 methylation is associated with arsenic-induced genotoxic stress in children

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Abstract

Early life exposure to arsenic has profound effect towards development of arsenic induced toxic outcomes. Some districts in the state of West Bengal, India are highly affected by arsenic, mainly through ground water. In children, not much of the toxic outcomes like dermatological lesions are observed but it is thought that the exposure leads to transient alteration in their biological processes that leads to various deleterious health effects later on. We evaluated the global methylation status by analyzing the LINE-1 methylation profile in children from arsenic exposed region between the age group 5–15 years along with the cytogenetic stress induced by arsenic as measured by lymphocyte micronucleus (MN) frequency. A total of 52 arsenic exposed and 32 unexposed children were analyzed. Whole blood DNA was used to measure the LINE-1 methylation by qRT-MSP. We found a significant association of MN-frequency in exposed individuals with highly depleted LINE-1 methylation compared to the exposed individuals with near baseline (which was comparable to unexposed control) methylation index as well as with those with the hypermethylated LINE-1 promoters. From our results, we interpret that LINE-1 methylation index may serve as a potent global epigenetic mark to detect the degree of arsenic genotoxicity at a very early age. We propose that this may be utilized to determine the extent of toxic influence exerted by arsenic, from a very early age.

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Acknowledgments

The authors are thankful to the University Grants Commission (UGC) to provide grant (PSW-069/13-14 (ERO) #WC2-124) to S.A. Thanks are also due to the Indian Council of Medical Research (ICMR) for providing SRF to S.P. The authors are grateful to Council of Scientific and Industrial Research (CSIR), New Delhi, India for providing grant to Emeritus Project Grant no. 21(0885)/12/EMR-II to A.K.G.

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  1. Molecular and Human Genetics Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata, 700032, India

    Apurba K. Bandyopadhyay & Somnath Paul

  2. Department of Zoology, Seth Anandaram Jaipuria College, 10, Raja Naba Krishna Street, Sobha Bazar, Kolkata, West Bengal, 700005, India

    Shanta Adak

  3. Molecular and Human Genetics Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India

    Ashok K. Giri

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  1. Apurba K. Bandyopadhyay
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Bandyopadhyay, A.K., Paul, S., Adak, S. et al. Reduced LINE-1 methylation is associated with arsenic-induced genotoxic stress in children. Biometals 29, 731–741 (2016). https://doi.org/10.1007/s10534-016-9950-4

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