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Published in: BMC Nutrition 1/2017

Open Access 01-12-2017 | Study protocol

Protocol for the EMPHASIS study; epigenetic mechanisms linking maternal pre-conceptional nutrition and children’s health in India and Sub-Saharan Africa

Authors: Giriraj R. Chandak, Matt J. Silver, Ayden Saffari, Karen A. Lillycrop, Smeeta Shrestha, Sirazul Ameen Sahariah, Chiara Di Gravio, Gail Goldberg, Ashutosh Singh Tomar, Modupeh Betts, Sara Sajjadi, Lena Acolatse, Philip James, Prachand Issarapu, Kalyanaraman Kumaran, Ramesh D. Potdar, Andrew M. Prentice, Caroline H. D. Fall, Lena Acolatse, Meraj Ahmed, Modupeh Betts, Giriraj R. Chandak, Harsha Chopra, Cyrus Cooper, Momodou K. Darboe, Chiara Di Gravio, Caroline H. D. Fall, Meera Gandhi, Gail R. Goldberg, Prachand Issarapu, Philip James, Ramatoulie Janha, Landing M. A. Jarjou, Lovejeet Kaur, Sarah H. Kehoe, Kalyanaraman Kumaran, Karen A. Lillycrop, Mohammed Ngum, Suraj S. Nongmaithem, Stephen Owens, Ramesh D. Potdar, Andrew M. Prentice, Ann Prentice, Tallapragada Divya Sri Priyanka, Ayden Saffari, Sirazul Ameen Sahariah, Sara Sajjadi, Harshad Sane, Smeeta Shrestha, Matt J. Silver, Ashutosh Singh Tomar, Kate A. Ward, Dilip Kumar Yadav, Chittaranjan S. Yajnik, the EMPHASIS study group

Published in: BMC Nutrition | Issue 1/2017

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Abstract

Background

Animal studies have shown that nutritional exposures during pregnancy can modify epigenetic marks regulating fetal development and susceptibility to later disease, providing a plausible mechanism to explain the developmental origins of health and disease. Human observational studies have shown that maternal peri-conceptional diet predicts DNA methylation in offspring. However, a causal pathway from maternal diet, through changes in DNA methylation, to later health outcomes has yet to be established. The EMPHASIS study (Epigenetic Mechanisms linking Pre-conceptional nutrition and Health Assessed in India and Sub-Saharan Africa, ISRCTN14266771) will investigate epigenetically mediated links between peri-conceptional nutrition and health-related outcomes in children whose mothers participated in two randomized controlled trials of micronutrient supplementation before and during pregnancy.

Methods

The original trials were the Mumbai Maternal Nutrition Project (MMNP, ISRCTN62811278) in which Indian women were offered a daily snack made from micronutrient-rich foods or low-micronutrient foods (controls), and the Peri-conceptional Multiple Micronutrient Supplementation Trial (PMMST, ISRCTN13687662) in rural Gambia, in which women were offered a daily multiple micronutrient (UNIMMAP) tablet or placebo. In the EMPHASIS study, DNA methylation will be analysed in the children of these women (~1100 children aged 5–7 y in MMNP and 298 children aged 7–9 y in PMMST). Cohort-specific and cross-cohort effects will be explored. Differences in DNA methylation between allocation groups will be identified using the Illumina Infinium MethylationEPIC array, and by pyrosequencing top hits and selected candidate loci. Associations will be analysed between DNA methylation and health-related phenotypic outcomes, including size at birth, and children’s post-natal growth, body composition, skeletal development, cardio-metabolic risk markers (blood pressure, serum lipids, plasma glucose and insulin) and cognitive function. Pathways analysis will be used to test for enrichment of nutrition-sensitive loci in biological pathways. Causal mechanisms for nutrition-methylation-phenotype associations will be explored using Mendelian Randomization. Associations between methylation unrelated to supplementation and phenotypes will also be analysed.

Conclusion

The study will increase understanding of the epigenetic mechanisms underpinning the long-term impact of maternal nutrition on offspring health. It will potentially lead to better nutritional interventions for mothers preparing for pregnancy, and to identification of early life biomarkers of later disease risk.
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Metadata
Title
Protocol for the EMPHASIS study; epigenetic mechanisms linking maternal pre-conceptional nutrition and children’s health in India and Sub-Saharan Africa
Authors
Giriraj R. Chandak
Matt J. Silver
Ayden Saffari
Karen A. Lillycrop
Smeeta Shrestha
Sirazul Ameen Sahariah
Chiara Di Gravio
Gail Goldberg
Ashutosh Singh Tomar
Modupeh Betts
Sara Sajjadi
Lena Acolatse
Philip James
Prachand Issarapu
Kalyanaraman Kumaran
Ramesh D. Potdar
Andrew M. Prentice
Caroline H. D. Fall
Lena Acolatse
Meraj Ahmed
Modupeh Betts
Giriraj R. Chandak
Harsha Chopra
Cyrus Cooper
Momodou K. Darboe
Chiara Di Gravio
Caroline H. D. Fall
Meera Gandhi
Gail R. Goldberg
Prachand Issarapu
Philip James
Ramatoulie Janha
Landing M. A. Jarjou
Lovejeet Kaur
Sarah H. Kehoe
Kalyanaraman Kumaran
Karen A. Lillycrop
Mohammed Ngum
Suraj S. Nongmaithem
Stephen Owens
Ramesh D. Potdar
Andrew M. Prentice
Ann Prentice
Tallapragada Divya Sri Priyanka
Ayden Saffari
Sirazul Ameen Sahariah
Sara Sajjadi
Harshad Sane
Smeeta Shrestha
Matt J. Silver
Ashutosh Singh Tomar
Kate A. Ward
Dilip Kumar Yadav
Chittaranjan S. Yajnik
the EMPHASIS study group
Publication date
01-12-2017
Publisher
BioMed Central
Published in
BMC Nutrition / Issue 1/2017
Electronic ISSN: 2055-0928
DOI
https://doi.org/10.1186/s40795-017-0200-0

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