Cited by 66Genetic Associations and EpidemiologyNutrition, Genetics, and DiseaseGenetic Mapping and Diversity in Plants and Animals

The expression of genes in top obesity-associated loci is enriched in insula and substantia nigra brain regions involved in addiction and reward

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Ndiaye, Fatou K., Huyvaert, Marlène, Ortalli, Ana, Canouil, Mickaël, Lecoeur, Cécile, Verbanck, Marie, Lobbens, Stéphane, Khamis, Amna +9 more·2020·International Journal of Obesity

Abstract

Background Genome-wide association studies (GWAS) have identified more than 250 loci associated with body mass index (BMI) and obesity. However, post-GWAS functional genomic investigations have been inadequate for understanding how these genetic loci physiologically impact disease development.Methods We performed a PCR-free expression assay targeting genes located nearby the GWAS-identified SNPs associated with BMI/obesity in a large panel of human tissues. Furthermore, we analyzed several genetic risk scores (GRS) summing GWAS-identified alleles associated with increased BMI in 4236 individuals.Results We found that the expression of BMI/obesity susceptibility genes was strongly enriched in the brain, especially in the insula (p = 4.7 × 10-9) and substantia nigra (p = 6.8 × 10-7), which are two brain regions involved in addiction and reward. Inversely, we found that top obesity/BMI-associated loci, including FTO, showed the strongest gene expression enrichment in the two brain regions.Conclusions Our data suggest for the first time that the susceptibility genes for common obesity may have an effect on eating addiction and reward behaviors through their high expression in substantia nigra and insula, i.e., a different pattern from monogenic obesity genes that act in the hypothalamus and cause hyperphagia. Further epidemiological studies with relevant food behavior phenotypes are necessary to confirm these findings.

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Authors
Ndiaye, F. K., Huyvaert, M., Ortalli, A., Canouil, M., Lecoeur, C., Verbanck, M., Lobbens, S., Khamis, A., Marselli, L., Marchetti, P., Kerr-Conte, J., Pattou, F., Marre, M., Roussel, R., Balkau, B., Froguel, P., & Bonnefond, A.
Affiliations
  • Centre National de la Recherche Scientifique (FR)
  • University of Pisa (IT)
  • Inserm (FR)
  • Université Paris-Sud (FR)
Corresponding author
  • Froguel, Philippe
  • Bonnefond, Amélie
Venue
International Journal of Obesity
Published
2019-08-06
Volume
44
Issue
2
Pages
539-543
ISSN
  • 0307-0565 (ISSN-L)
  • 1476-5497
OpenAlex
W2966385695
Cited by
66
References
24
Citations by year
2026: 6 · 2025: 12 · 2024: 10 · 2023: 15 · 2022: 9 · 2021: 10 · 2020: 4
FWCI
3.47
Type
journal article
Language
en
Open access
Locations
  • International Journal of Obesity (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • HAL (submittedVersion)
  • CINECA IRIS Institutial research information system (University of Pisa) (submittedVersion)
Funders
  • Agence Nationale de la Recherche (ANR-10-LABX-0046, ANR-10-EQPX-0007)
  • National Institutes of Health
  • Common Fund
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Nutrition, Genetics, and Disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Mapping and Diversity in Plants and Animals
Keywords
obesity, body mass index, gene expression, insula, substantia nigra, food addiction, reward behavior, FTO, polygenic risk score, brain gene expression, food behavior
MeSH terms
Adult, Cerebral Cortex, Humans, Hyperphagia, Middle Aged, Obesity, Reward, Substantia Nigra, Body Mass Index, Behavior, Addictive, Genetic Predisposition to Disease, Polymorphism, Single Nucleotide, Genome-Wide Association Study

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