Abstract
Vitamin B12 deficiency is a critical problem worldwide and peri-conceptional deficiency of this vitamin is associated with the risk of complex cardio-metabolic diseases. Nutritional perturbations during these stages of development may lead to changes in the fetal epigenome. Using Wistar rat model system, we have earlier shown that low maternal B12 levels are associated with low birth weight, adiposity, insulin resistance, and increased triglyceride levels in the offspring, which might predispose them to the risk of cardio-metabolic diseases in adulthood. In this study, we have investigated the effects of maternal B12 deficiency on genome-wide DNA methylation profile of the offspring and the effect of rehabilitation of mothers with B12 at conception. We have performed methylated DNA immunoprecipitation sequencing of liver from pups in four groups of Wistar rats: Control (C), B12-restricted (B12R), B12-rehabilitated at conception (B12RC), and B12-rehabilitated at parturition (B12RP). We have analyzed differentially methylated signatures between the three groups as compared to controls. We have identified a total of 214 hypermethylated and 142 hypomethylated regions in the 10 kb upstream region of transcription start site in pups of B12-deficient mothers, which are enriched in genes involved in fatty acid metabolism and mitochondrial transport/metabolism. B12 rehabilitation at conception and parturition is responsible for reversal of methylation status of many of these regions to control levels suggesting a causal association with metabolic phenotypes. Thus, maternal B12 restriction alters DNA methylation of genes involved in important metabolic processes and influences the offspring phenotype, which is reversed by B12 rehabilitation of mothers at conception.
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Data availability
Relevant information has been provided in the paper. All the information about DMRs and their respective genomic coordinates have been provided in Supplementary Tables.
Abbreviations
- MeDIP:
-
Methylated DNA immunoprecipitation
- PPAR:
-
Peroxisome proliferator-activated receptor
- DMR:
-
Differentially methylated regions
- MACS:
-
Model-based analysis for Chip-Seq
- TSS:
-
Transcription start site
- UTR:
-
Untranscribed region
- ACAA2:
-
Acetyl-coA acyltransferase 2
- CYP4A1/A3:
-
Cytochrome P450 family 4 subfamily A1/A3
- ECSIT:
-
Evolutionary conserved signaling intermediate in Toll pathway, mitochondrial
- TOMM4OB:
-
Translocase of outer mitochondrial membrane 40 blocking peptide
- CYCS:
-
Cytochrome C somatic
- NCAM2:
-
Neural cell adhesion molecule 2
- RT1:
-
N1/N2-cell surface antigen
- ADIPOR2:
-
Adiponectin receptor 2
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Acknowledgements
The authors acknowledge the efforts by Vaibhav Jain for his valuable suggestions in the MeDIP analysis. Dr. Anju Sharma and Dr. Shamima Akhtar also provided their critical inputs and helped in proofreading the manuscript. The authors also acknowledge the Sequencing and computation facility at CSIR-IGIB.
Funding
This work was financially supported by Council of Scientific and Industrial Research (CSIR), Ministry of Science and Technology, Government of India, India (EpiHED; BSC0118″ and GEHeaD; MLP1804). The funding organization had no role in the design of experiments. The authors declare no conflict of interest. No assistance has been taken from any external organization while performing the sequencing experiments and writing the manuscript.
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VST, did the MeDIP and CpG-specific (bisulfite) methylation experiments, was involved in analysis and wrote the initial draft of the paper. VS and SG (Sourav) were involved in bioinformatics work. SS (Satish) helped in the methylation experiments and data analysis. SG (Subhoshree) was involved in bisulfite capture experiments and provided critical inputs in improving the manuscript. LK, KAK, PK, and VJ were involved in all the animal experiments. SSB, SKV, AP, and MS were involved in sequencing experiments. MR, RM, GRC, and SS (Shantanu) were involved in designing the study including animal experiments. GRC and SS were also involved in data analysis and writing the manuscript. All authors read and approved the contents in the manuscript and declare no conflict of interest.
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Tanwar, V.S., Ghosh, S., Sati, S. et al. Maternal vitamin B12 deficiency in rats alters DNA methylation in metabolically important genes in their offspring. Mol Cell Biochem 468, 83–96 (2020). https://doi.org/10.1007/s11010-020-03713-x
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DOI: https://doi.org/10.1007/s11010-020-03713-x