Life-course publications map

Publications from the LongITools project will be mapped against the life-course below. The coloured bars on the timeline show the ages of the people studied. The categories are either exposures, molecular responses or outcomes of the study.

Publications Map © Beta Technology Ltd 2020

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Associations of circulating folate, vitamin B12 and homocysteine concentrations in early pregnancy and cord blood with epigenetic gestational age: the Generation R Study

29/04/2021 - Monasso G.S. et al. Clinical Epigenetics. LongITools authors: Vincent Jaddoe and Janine Felix - Erasmus MC
Cohort(s): Generation R

Concentrations of folate, vitamin B12 and homocysteine during pregnancy are associated with childhood health outcomes. In a population-based study of 1,346 mothers and newborns, we found some evidence to support associations of maternal plasma homocysteine concentrations with positive epigenetic gestational age acceleration, suggesting faster epigenetic than clinical gestational ageing. Cord serum vitamin B12 concentrations may be associated with negative gestational age acceleration, indicating slower epigenetic than clinical gestational ageing.

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Paternal body mass index and offspring DNA methylation: findings from the PACE consortium

29/01/2021 - Gemma C Sharp et al. International Journal of Epidemiology. LongITools authors: Vincent Jaddoe, Johanna Lepeule and Janine Felix - Erasmus MC, National Institute of Medical Research

Overweight and obesity in fathers around the time of conception is related to offspring health. Changes in DNA methylation may be an underlying biological mechanism. In a large study including data from almost 5000 newborns and almost 2000 children, we did not find evidence to support this.

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Machine Learning-Based DNA Methylation Score for Fetal Exposure to Maternal Smoking: Development and Validation in Samples Collected from Adolescents and Adults

15/09/2020 - Rauschert S. et al. Environmental Health Perspectives. LongITools authors: Anni Heiskala, Ville Karhunen, Marjo-Riitta Järvelin and Sylvain Sebert - University of Oulu
Cohort(s): Northern Finland Birth Cohorts, Raine Study

Fetal exposure to maternal smoking during pregnancy is associated with the development of noncommunicable diseases in the offspring. Maternal smoking may induce such long-term effects through persistent changes in the DNA methylome, which therefore hold the potential to be used as a biomarker of this early life exposure. We have developed a DNA methylation score for exposure to maternal smoking during pregnancy. One possible application of the current score could be for model adjustment purposes or to assess its association with distal health outcomes where part of the effect can be attributed to maternal smoking. Furthermore, it may provide a biomarker for fetal exposure to maternal smoking.

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Early exposure to social disadvantages and later life body mass index beyond genetic predisposition in three generations of Finnish birth cohorts

18/05/2020 - Lowry, E., Rautio, N., Wasenius, N. et al. BMC Public Health. LongITools Authors: Anni Heiskala, Leena Ala-Mursula, Jouko Miettunen, Marjo-Riitta Järvelin and Sylvain Sebert - University of Oulu
Cohort(s): Northern Finland Birth Cohorts, Helsinki Birth Cohort Study

High social disadvantage in early life appears to be associated with being with higher BMI in later life. Reducing exposure to social disadvantage during the life-course reduced the risk a and may be a potential pathway for obesity reduction.

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Epigenome-wide change and variation in DNA methylation in childhood: Trajectories from birth to late adolescence

01/01/2021 - Rosa H Mulder et al. Human Molecular Genetics. LongITools authors: Janine Felix, Vincent Jaddoe - Erasmus MC
Cohort(s): ALSPAC, Generation R

DNA methylation is an important biological process in childhood health and development, but a comprehensive characterisation of genome-wide DNAm trajectories across this age period is currently lacking. In this manuscript, we used data from epigenome-wide association studies in 5,019 blood samples collected at multiple time-points from birth to late adolescence from 2,348 participants of two large independent cohorts to characterize DNAm trajectories over time. We found that DNAm levels change over time in more than half of the DNAm sites and we describe these changes. Our findings support a developmental role for DNA methylation that extends beyond birth into late adolescence and has implications for understanding life-long health and disease. DNAm trajectories can be visualized at http://epidelta.mrcieu.ac.uk.

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Heterogeneous contributions of change in population distribution of body mass index to change in obesity and underweight

09/03/2021 - NCD Risk Factor Collaboration (NCD-RisC). eLife. LongITools authors: Marjo-Riitta Järvelin and Sylvain Sebert - University of Oulu

Changes in the prevalence of underweight and total obesity, and to a lesser extent severe obesity, are largely driven by shifts in the distribution of BMI, with smaller contributions from changes in the shape of the distribution. In East and Southeast Asia and sub-Saharan Africa, the underweight tail of the BMI distribution was left behind as the distribution shifted. There is a need for policies that address all forms of malnutrition by making healthy foods accessible and affordable, while restricting unhealthy foods through fiscal and regulatory restrictions.

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Maternal and infant prediction of the child BMI trajectories; studies across two generations of Northern Finland Birth Cohorts

11/10/2020 - Rozenn Nedelec et al. International Journal of Obesity. LongITools authors: Rozenn Nedelec, Marjo-Riitta Järvelin and Sylvain Sebert - University of Oulu
Cohort(s): Northern Finland Birth Cohorts

Detrimental maternal factors were consistently associated with a higher risk obesity trajectory in two generations of Finnish birth cohorts, with a greater amplitude of the effects observed in the younger cohort. However, a discordant association between the timing of adiposity peak in relation to adverse BMI trajectories occurred over the course of a generation, adding further evidence of the link between very early mechanisms, in the first months of life, and childhood obesity.

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Associations of hair cortisol concentrations with cardiometabolic risk factors in childhood

29/05/2021 - Florianne O L Vehmeijer et al. J Clin Endocrinol Metab. LongITools authors: Susana Santos, Vincent Jaddoe and Janine Felix - Erasmus MC
Cohort(s): Generation R

Stress is related to cardiovascular disease in adults. In a population-based study of 2,598 children, we measured hair cortisol levels at age 6 years as a marker of exposure to stress and examined if these were associated with cardiometabolic risk factors, such as blood pressure and lipid levels, at age 10 years. We did not find such associations after taking BMI into account. The associations of biological stress with cardiometabolic risk factors may develop at later ages.

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Sex-dimorphic genetic effects and novel loci for fasting glucose and insulin variability

05/01/2021 - Lagou V. et al. Nature Communications. LongITools authors: Inga Prokopenko, Marika Kaakinen, Anna Ulrich, Nicholas Timpson, Marjo-Riitta Jarvelin - University of Surrey, Imperial College London, University of Bristol

We report sex dimorphism in allelic effects on fasting insulin at IRS1 and ZNF12 loci, the latter showing higher RNA expression in whole blood in women compared to men. We also observe sex-homogeneous effects on fasting glucose at seven novel loci. Fasting insulin in women shows stronger genetic correlations than in men with waist-to-hip ratio and anorexia nervosa. Furthermore, waist-to-hip ratio is causally related to insulin resistance in women, but not in men.

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Risk of Recurrent Pregnancy Loss in the Ukrainian Population Using a Combined Effect of Genetic Variants: A Case-Control Study

05/01/2021 - Eleni M. Loizidou et al. Genes. LongITools authors: Marika Kaakinen and Inga Prokopenko - University of Surrey

By combining 12 genetic variants from loci reflecting the main biological pathways involved in pregnancy maintenance, we had an improved ability to classify women with and without recurrent pregnancy loss. This highlights the potential of genetics in predicting the risk of this complex multifactorial condition in women of reproductive age.

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Expression Quantitative Trait Locus Mapping in Pulmonary Arterial Hypertension

22/10/2020 - Ulrich A. et al. Genes. LongITools authors: Inga Prokopenko, Anna Ulrich - University of Surrey

We demonstrate the utility of mapping expression quantitative trait loci (eQTL), which is normally done in individuals from a healthy population, in individuals with a disease. We report novel gene – eQTL pairs overlapping GWAS loci which could possibly aid in the biological interpretation of GWAS associations.

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Heterogeneous Effects of Calorie Content and Nutritional Components Underlie Dietary Influence on Pancreatic Cancer Susceptibility

14/07/2020 - James Dooley et al. Cell Reports. LongITools authors: Inga Prokopenko, Anna Ulrich - University of Surrey

Pancreatic cancer is a rare but fatal form of cancer, the fourth highest in absolute mortality. Known risk factors include obesity, diet, and type 2 diabetes; however, the low incidence rate and interconnection of these factors confound the isolation of individual effects. Here, we use epidemiological analysis of prospective human cohorts and parallel tracking of pancreatic cancer in mice to dissect the effects of obesity, diet, and diabetes on pancreatic cancer. Using epidemiological approaches in humans, we find that dietary sugars give a MAD2L1 genotype-dependent increased susceptibility to pancreatic cancer. The translation of these results to a clinical setting could aid in the identification of the at-risk population for screening and potentially harness dietary modification as a therapeutic measure.

COVID‐19 mortality in the UK Biobank cohort: revisiting and evaluating risk factors

15/02/2021 - Elliott, J. et al. European Journal of Epidemiology. LongITools authors: Barbara Bodinier, Roel Vermeulen and Marc Chadeau‐Hyam - Imperial College London, Utrecht University
Cohort(s): UK Biobank

Several factors have been identified as driving the risk of COVID-19 mortality using routine/hospital based studies. Using general population studies we investigate the role of demographic, social, lifestyle, biological, medical and environmental data from UK Biobank in relation to COVID-19 and non-COVID-19 deaths.

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Plasma metabolites associated with exposure to perfluoroalkyl substances and risk of type 2 diabetes – A nested case-control study.

01/01/2021 - T. Schillemans et al. Environment International. LongITools authors: Kati Hanhineva, Rikard Landberg and Carl Brunius. - University of Eastern Finland, Chalmers University of Technology

Perfluoroalkyl substances (PFAS) are widespread persistent environmental pollutants. PFAS may impact Type 2 Diabetes (T2D) development, but findings are inconsistent. Using untargeted metabolomics, we found two groups of metabolites (diacylglycerols and glycerophospholipids) that correlated positively with PFAS. However, these two metabolite groups showed opposite associations with T2D risk, which may help to explain the conflicting results found for PFAS and T2D.

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How does childhood maltreatment influence cardiovascular disease? A sequential causal mediation analysis

26/05/2021 - Ana G Soares et al. International Journal of Epidemiology. LongITools authors: Ana G Soares - University of Bristol
Cohort(s): UK Biobank

Although there is a robust association between childhood maltreatment and cardiovascular disease (CVD) risk, the mechanisms underlying this relationship are not yet fully understood. In this study we showed that anxiety/depression, smoking, body mass index (BMI) and inflammation mediated 26%-90% of the association between childhood maltreatment and CVD and the contribution of these mediators differed by type of maltreatment and sex.

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Post-weight loss changes in fasting appetite and energy balance-related hormone concentrations and the effect of the macronutrient content of a weight maintenance diet: a randomised controlled trial

02/12/2020 - Näätänen M. et al. European Journal of Nutrition. LongITools authors: Marjukka Kolehmainen, Mari Näätänen - University of Eastern Finland

The study looked at the effects of the macronutrient composition of diets with differing satiety values on fasting appetite-related hormone concentrations after weight loss and examined whether the hormone secretion adapted to changes in body fat mass and fat-free mass (FFM) during the weight maintenance period (WM). The macronutrient composition of an isoenergetic WM diet did not affect fasting appetite-related hormone concentrations. Leptin and insulin associated with the amount of the reduced fat mass, whereas ghrelin reflected FFM during the first months of the WM.

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