Cited by 1,332Adipose Tissue and MetabolismGenetic Associations and EpidemiologyEpigenetics and DNA Methylation

FTO Obesity Variant Circuitry and Adipocyte Browning in Humans

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Claussnitzer, Melina, Dankel, Simon N., Kim, Kyoung-Han, Quon, Gerald, Meuleman, Wouter, Haugen, Christine, Glunk, Viktoria, Sousa, Isabel S. +11 more·2015·New England Journal of Medicine

Abstract

BACKGROUND: Genomewide association studies can be used to identify disease-relevant genomic regions, but interpretation of the data is challenging. The FTO region harbors the strongest genetic association with obesity, yet the mechanistic basis of this association remains elusive. METHODS: We examined epigenomic data, allelic activity, motif conservation, regulator expression, and gene coexpression patterns, with the aim of dissecting the regulatory circuitry and mechanistic basis of the association between the FTO region and obesity. We validated our predictions with the use of directed perturbations in samples from patients and from mice and with endogenous CRISPR-Cas9 genome editing in samples from patients. RESULTS: Our data indicate that the FTO allele associated with obesity represses mitochondrial thermogenesis in adipocyte precursor cells in a tissue-autonomous manner. The rs1421085 T-to-C single-nucleotide variant disrupts a conserved motif for the ARID5B repressor, which leads to derepression of a potent preadipocyte enhancer and a doubling of IRX3 and IRX5 expression during early adipocyte differentiation. This results in a cell-autonomous developmental shift from energy-dissipating beige (brite) adipocytes to energy-storing white adipocytes, with a reduction in mitochondrial thermogenesis by a factor of 5, as well as an increase in lipid storage. Inhibition of Irx3 in adipose tissue in mice reduced body weight and increased energy dissipation without a change in physical activity or appetite. Knockdown of IRX3 or IRX5 in primary adipocytes from participants with the risk allele restored thermogenesis, increasing it by a factor of 7, and overexpression of these genes had the opposite effect in adipocytes from nonrisk-allele carriers. Repair of the ARID5B motif by CRISPR-Cas9 editing of rs1421085 in primary adipocytes from a patient with the risk allele restored IRX3 and IRX5 repression, activated browning expression programs, and restored thermogenesis, increasing it by a factor of 7. CONCLUSIONS: Our results point to a pathway for adipocyte thermogenesis regulation involving ARID5B, rs1421085, IRX3, and IRX5, which, when manipulated, had pronounced pro-obesity and anti-obesity effects. (Funded by the German Research Center for Environmental Health and others.).

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Crossref · 10.1056/nejmoa1502214

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  • The strongest associated obesity GWAS signal lies within an intron of FTO but principally influences expression of distal genes IRX3 and IRX5.

    “One such example comes from the strongest associated obesity GWAS signal that lies within an intron of the FTO gene, but principally influences the expression of distal genes IRX3 and IRX517–19.”
  • Primary human cell lines are limited by the complex nature and convergence of multiple cell types causing most complex diseases.

    “But their use is limited by the complex nature and convergence of multiple cell types causing most complex diseases.”

    From Multi-omics approaches to disease (2017) · cites this paper as [16]

  • Substantial enrichment for genes involved in mitochondrial functions and lipid metabolism was observed, suggesting possible roles in thermogenesis.

    “Substantial enrichment for genes involved in mitochondrial functions and lipid metabolism was observed, which suggests possible roles in thermogenesis.”

    From Multi-omics approaches to disease (2017) · cites this paper as [16]

  • Adipocyte size and mitochondrial DNA content were shown to differ significantly between 24 risk alleles and 34 non-risk alleles, consistent with an adipocyte-autonomous effect on energy balance.

    “Adipocyte size and mitochondrial DNA content were then studied for 24 risk alleles and 34 non-risk alleles and shown to differ significantly, consistent with an adipocyte-autonomous effect on energy balance.”

    From Multi-omics approaches to disease (2017) · cites this paper as [16]

  • The causal variant at the FTO locus was predicted using cross-species conservation and targeted editing with CRISPR-Cas9 identified a single nucleotide variant that disrupts ARID5B repressor binding.

    “Finally, the causal variant at the FTO locus was predicted using cross-species conservation and targeted editing with CRISPR-Cas9 identified a single nucleotide variant that disrupts ARID5B repressor binding.”

    From Multi-omics approaches to disease (2017) · cites this paper as [16]

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Authors
Claussnitzer, M., Dankel, S. N., Kim, K.-H., Quon, G., Meuleman, W., Haugen, C., Glunk, V., Sousa, I. S., Beaudry, J. L., Puviindran, V., Abdennur, N. A., Liu, J., Svensson, P.-A., Hsu, Y.-H., Drucker, D. J., Mellgren, G., Hui, C.-C., Hauner, H., & Kellis, M.
Affiliations
  • Broad Institute (US)
  • Haukeland University Hospital (NO)
  • University of Toronto (CA)
  • TUM Klinikum (DE)
  • Mount Sinai Hospital (CA)
  • University of Gothenburg (SE)
  • Beth Israel Deaconess Medical Center (US)
Venue
New England Journal of Medicine
Published
2015-09-03
Volume
373
Issue
10
Pages
895-907
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W1636205509
Cited by
1,332
References
34
Citations by year
2026: 73 · 2025: 105 · 2024: 93 · 2023: 92 · 2022: 120 · 2021: 145 · 2020: 133 · 2019: 121 · 2018: 132 · 2017: 140 · 2016: 142 · 2015: 35 · 2014: 1
FWCI
110.30
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
  • eScholarship (California Digital Library) (submittedVersion)
  • mediaTUM – the media and publications repository of the Technical University Munich (Technical University Munich) (submittedVersion)
  • Site cant be reached (submittedVersion)
Funders
  • Heart and Stroke Foundation of Canada
  • Australian Government
  • Technische Universität München
  • Hospital for Sick Children
  • National Institutes of Health
  • Canadian Institutes of Health Research
  • Helmholtz Zentrum München
  • National Human Genome Research Institute (R01HG008155, RC1HG005334, R01HG004037)
  • National Institute of General Medical Sciences (R01GM113708)
Topics
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
Keywords
FTO, obesity, adipocyte browning, mitochondrial thermogenesis, ARID5B, IRX3, IRX5, rs1421085, preadipocyte differentiation, white adipocytes, beige adipocytes, CRISPR/Cas9 genome editing, epigenetic regulation
MeSH terms
Alpha-Ketoglutarate-Dependent Dioxygenase FTO, Alleles, Animals, Base Sequence, Genetic Engineering, Humans, Mitochondria, Molecular Sequence Data, Obesity, Phenotype, Proteins, Risk, Gene Expression, RNA Editing, Adipocytes, Thermogenesis, Mice, Epigenomics, Clustered Regularly Interspaced Short Palindromic Repeats

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