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Genetics and Epigenetics

Increased BMI and late-life mobility dysfunction; overlap of genetic effects in brain regions

Abstract

Background

How obesity earlier in life impacts upon mobility dysfunctions in late life is not well understood. Pernicious effects of excess weight on the musculoskeletal system and mobility dysfunctions are well-recognized. However, increasingly more data support the link of obesity to overall motor defects that are regulated in the brain.

Objectives

To assess the causal relationship between body mass index (BMI) at midlife and performance of the Timed Up-and-Go test (TUG) in late life among a population-based longitudinal cohort of Chinese adults living in Singapore.

Methods

We evaluated genetic predispositions for BMI in 8342 participants who were followed up from measurement of BMI at average 53 years, to TUG test (as a functional mobility measure) 20 years later.

Results

A robust 75.83% of genetically determined BMI effects on late-life TUG scores were mediated through midlife BMI (Pindirect-effect = 9.24 × 10−21). Utilizing Mendelian randomization, we demonstrated a causal effect between BMI and functional mobility in late life (βIVW = 0.180, PIVW = 0.001). Secondary gene enrichment evaluations highlighted down-regulation of genes at BMI risk loci that were correlated with poorer functional mobility in the substantia nigra and amygdala regions as compared to all other tissues. These genes also exhibit differential expression patterns during human brain development.

Conclusions

We report a causal effect of obesity on mobility dysfunction. Our findings highlight potential neuronal dysfunctions in regulating predispositions on the causal pathway from obesity to mobility dysfunction.

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Fig. 1: Linear relationship between weighted genetic risk score for body mass index (BMI) (wGRS, instrument variable), midlife BMI (exposure), and timed up-and-go (TUG in late life, outcome).
Fig. 2: Mediation analysis to quantify effects of genetic variant on timed up-and-go (TUG) in late life through midlife BMI (significant indirect effect, P = 9.24 × 10−21) and not through midlife BMI (non-significant direct effect, P = 0.489).
Fig. 3: Top tissue enrichments observed with gene expression data in tissues from GTEx database (both side).

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Data availability

The data that support the findings of this study are available from the corresponding authors upon reasonable request.

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Funding

The Singapore Chinese Health Study was supported by grants from the National Medical Research Council, Singapore (NMRC/CIRG/1456/2016), National Institutes of Health (R01 CA144034 and UM1 CA182876) and National Research Foundation, Singapore (Project Number 370062002). W-PK is supported by the National Medical Research Council, Singapore (MOH-CSASI19nov-0001). C-CK was supported by National Research Foundation Singapore (NRF-NRFI2018-01).

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Contributions

RD, C-KH, and W-PK, contributed to the study design. W-PK, and J-MY contributed to the sample recruitment and data processing. C-CK, and W-PK generated genotyping data. RD, XC, LW, JL, and C-CK performed genotype quality controls, imputation and genotyping analyses. RD, XC, KYC, and FLN performed statistical analyses. RD, and XC performed bioinformatics analyses. RD, C-KH, and XC verified underlying data. RD, KYC, and XC, drafted the manuscript. All authors critically reviewed the manuscript.

Corresponding authors

Correspondence to Chew-Kiat Heng or Rajkumar Dorajoo.

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Chang, X., Chua, K.Y., Ng, F.L. et al. Increased BMI and late-life mobility dysfunction; overlap of genetic effects in brain regions. Int J Obes 47, 358–364 (2023). https://doi.org/10.1038/s41366-023-01275-8

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