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Differential susceptibility is defined by Belsky et al. JAMA Pediatr. Importance Genes may work by modulating the way individuals respond to environmental variation, and these discrete and differential genes vs environmental interactions may not be readily captured in simple association studies. Objective To determine whether children carrying the 7-repeat allele of the DRD4 gene living under adverse economic conditions have worse-than-average fat intake compared with those living in a healthy environment.
De, Setting, and Participants Data from an established prospective birth cohort Maternal Adversity, Vulnerability, and Neurodevelopment were used to study 4-year-old children from Montreal, Quebec, Canada and Hamilton, Ontario, Canada. A total of children 94 girls and 96 boys had height and weight measured and complete food diaries and were therefore eligible for the study. The study is derived from a birth cohort started in June and still ongoing.
The last age of follow-up was at 6 years. Exposures Social environment was characterized based on the gross family income, and DNA was genotyped for the 7-repeat allele of the DRD4 gene. The 5 steps to distinguish the differential susceptibility from other types of interaction were followed, and the study confirms that differential susceptibility is a relevant model to address the association between the 7-repeat allele of DRD4 and food choices in girls. Of the children, did not have the DRD4 7-repeat allele and 78 did. Baseline characteristics did not differ in these 2 groups.
This finding has important implications for obesity prevention and social pediatrics. Genome-wide association studies 12 have been successful Sex forum Lico Grande identifying several genes associated with obesity. However, genes may work by modulating the way individuals respond to environmental variation, and these discrete and differential genes vs environmental interactions may not be readily captured in simple association studies. In addition, to date, most of these studies focused on body mass index not food intake or energy expenditure as the outcome, which may not be informative in terms of identifying vulnerability and proposing preventive measures.
The differential susceptibility hypothesis 34 suggests an alternative approach to genetic association studies that may have particular utility for common, complex diseases, such as obesity. From an evolutionary perspective, the genetic differential susceptibility hypothesis proposes that, as a form of bet-hedging against an uncertain future, natural selection has maintained genes for both conditional shaped by the environment and alternative fixed health strategies.
Research on the differential susceptibility hypothesis has thus far almost exclusively focused on socioemotional and cognitive-developmental outcomes, indicating that plasticity genes vary in relation to how much carriers compared with noncarriers are negatively affected by environmental adverse events 67 and how much they benefit from support. Of interest, at the same time that dopamine-related genes form one of the main groups of genes that influence neurocognitive outcomes, they also underlie motivated behaviors and decision-making processes, which are known to be involved in eating choices.
Considering the differential Sex forum Lico Grande hypothesis 11 and the association between the 7-repeat allele of DRD4 OMIM with maladaptive eating, 12 - 14 we hypothesized that children carrying the 7-repeat allele living under adverse social and economic conditions would have worse-than-average maladaptive eating. On the other hand, children carrying the 7-repeat allele living in a healthy, nonadverse environment would actually have better-than-average food choices.
Question: Does the 7-repeat allele of DRD4 that is associated with maladaptive eating exhibit differential susceptibility effects under adverse vs healthy environments? Findings: The study confirms that the differential susceptibility is a relevant model to address the association between the Sex forum Lico Grande allele of DRD4 and food choices in girls. Meaning: The underscore the possibility of going beyond the one-size-fits-all approach to childhood obesity prevention and moving toward better targeted approaches that focus on populations that are particularly genetically vulnerable to a disadvantaged social environment and more responsive to interventions that foster more favorable conditions.
Children came to the laboratory for various food-related measures and had their standing height, without shoes, measured to the nearest 0. Body weight, with participants in light clothing, was measured to the nearest 0. Body mass index was calculated as weight in kilograms divided by height in meters squared. Written informed consent was obtained from all participants. A total of children 94 girls and 96 boys had complete food frequency questionnaires for analysis, valid for the local population.
On the basis of these questionnaires, the quantitative analysis of total caloric and macronutrient intake is derived using NutriBase software, version NB7 CyberSoft Inc. In this data analysis, we studied the percentage of calories derived from fat reported on the questionnaires. The 48—base pair variable of tandem repeats region in the third exon of DRD4 was amplified with polymerase chain reaction techniques with primers and conditions ly described. The genetic model was driven by the biological function because the 7-repeat allele is markedly hypofunctional relative to all other alleles.
Thus, it is presence or absence of this allele that affects the phenotype dominant model. To test for the specificity of the model, we also repeated the analysis using different susceptibility factors, such as low birth weight, maternal smoking during gestation, and poor maternal care 22 ; analysis was performed again using different outcomes sugar and percentage of protein consumed.
Data were analyzed using SPSS software, version Children with or without the 7-repeat genotype did not differ in many confounders Tablesuch as maternal educational level, maternal smoking during gestation, birth weight, and breastfeeding duration. To test our hypothesis, we followed the model proposed by Belsky et al.
In step 2, the aim is to distinguish differential susceptibility from other gene-environment correlations that may reflect rearing experiences evoked by the genotypes to show that the susceptibility factor income and the predictor DRD4 genotype are independent.
In step 3, a test of the association between the susceptibility factor and the outcome should be performed; if the association is nonzero, there is no support for differential susceptibility. Step 4 is a comparison of the regression plot with the prototypical graphic representing differential susceptibility. As seen in Figure 2the plot from the preliminary data is similar to the prototypical graphic representing differential susceptibility.
Finally, in step 5, the specificity of the model should be tested by replacing susceptibility factors and outcomes. The 5 steps proposed by Belsky et al 11 to distinguish the differential susceptibility from other types of interaction were followed, and the study confirms that the differential susceptibility is a relevant model to address the association between the 7-repeat allele of DRD4 and food choices in girls.
Shifting from a vulnerability to a differential susceptibility paradigm not only enables the study of the full range of negative and positive gene vs environmental interactions but also has the potential to bring more impactful and Sex forum Lico Grande targeted intervention to improve developmental and health outcomes to the individuals who are also the most vulnerable. We focused on the DRD4 polymorphism for the association of this gene variant with obesity risk, which has been extensively studied by our group, 131425 and for the evidence that DRD4 could function as a plasticity gene in neurocognitive outcomes.
Of interest, the effect is exclusively found in girls. The reported gene vs environment interaction could be adaptively more important for females, especially considering reproductive strategies in adverse environments. Alternatively, it is possible that at this age the effect is not seen in boys because growth in general and specifically the adiposity rebound occur at different ages according to sex, 27 and these events Sex forum Lico Grande appetite. Finally, considering the literature reporting differences in the brain processing and behavioral responses to feelings of hunger and satiation, 3031 as well as food preferences, 32 in females vs males, such gene vs environmental interactions may as well be sex specific, especially at this age.
Although future research is needed to elicit further genetic differential susceptibility in both sexes, the present of maladaptive eating in girls before obesity has taken place may inform obesity prevention and primary pediatric care. Our study has some limitations, such as the sample size; these should be replicated in larger samples.
In addition, our study was performed in a country where there is not a large variation in terms of socioeconomic status. Replication in places of extreme socioeconomic inequalities will be informative. There are large disparities in the nutritional quality of the food environment between individuals and neighborhoods from low and high socioeconomic statuses.
Food-related marketing activities, 36 convenience stores, 37 and fast-food outlet availability near schools 38 are more prevalent in neighborhoods with low compared with high socioeconomic statuses. Considering that poor diet and obesity are critical risk factors for diabetes mellitus, cardiovascular disease, and other chronic diseases that make up the greatest share of health care expenses, 39 this may render ever more pressing the recommendation for society to prioritize human capital investment in fighting poverty earlier rather than later in life.
The of this study underscore the possibility of going beyond the present one-size-fits-all approach to childhood obesity prevention and moving toward better targeted approaches that focus on populations that are particularly genetically vulnerable to disadvantaged social environments and more responsive to interventions that foster more favorable conditions, be they environmental or individual. Efforts have been made to test this possibility and find support for the genetic moderation of intervention efficacy in a manner consistent with the differential susceptibility concept.
Corresponding Author: Patricia P. Published Online: February 1, Author Contributions: Drs Silveira and Levitan had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
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Genetic studies of body mass index yield new insights for obesity biology. PubMed Google Scholar Crossref. Fall T, Ingelsson E. Genome-wide association studies of obesity and metabolic syndrome. Mol Cell Endocrinol.
Belsky J. Variation in susceptibility to environmental influence: an evolutionary argument. Psychol Inq. Google Scholar Crossref. Biological sensitivity to context, I: an evolutionary-developmental theory of the origins and functions of stress reactivity. Dev Psychopathol. Mating-effort in adolescence: a conditional or alternative strategy. Pers Individ Dif. Role of genotype in the cycle of violence in maltreated children.Sex forum Lico Grande
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