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© Research
Publication : The Journal of clinical endocrinology and metabolism

Ethnicity-Specific Skeletal Muscle Transcriptional Signatures and Their Relevance to Insulin Resistance in Singapore.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The Journal of clinical endocrinology and metabolism - 01 Feb 2019

Tan ALM, Langley SR, Tan CF, Chai JF, Khoo CM, Leow MK, Khoo EYH, Moreno-Moral A, Pravenec M, Rotival M, Sadananthan SA, Velan SS, Venkataraman K, Chong YS, Lee YS, Sim X, Stunkel W, Liu MH, Tai ES, Petretto E,

Link to Pubmed [PMID] – 30137523

Link to DOI [DOI] – 10.1210/jc.2018-00309

J. Clin. Endocrinol. Metab. 2019 02; 104(2): 465-486

Insulin resistance (IR) and obesity differ among ethnic groups in Singapore, with the Malays more obese yet less IR than Asian-Indians. However, the molecular basis underlying these differences is not clear.As the skeletal muscle (SM) is metabolically relevant to IR, we investigated molecular pathways in SM that are associated with ethnic differences in IR, obesity, and related traits.We integrated transcriptomic, genomic, and phenotypic analyses in 156 healthy subjects representing three major ethnicities in the Singapore Adult Metabolism Study.This study contains Chinese (n = 63), Malay (n = 51), and Asian-Indian (n = 42) men, aged 21 to 40 years, without systemic diseases.We found remarkable diversity in the SM transcriptome among the three ethnicities, with >8000 differentially expressed genes (40% of all genes expressed in SM). Comparison with blood transcriptome from a separate Singaporean cohort showed that >95% of SM expression differences among ethnicities were unique to SM. We identified a network of 46 genes that were specifically downregulated in Malays, suggesting dysregulation of components of cellular respiration in SM of Malay individuals. We also report 28 differentially expressed gene clusters, four of which were also enriched for genes that were found in genome-wide association studies of metabolic traits and disease and correlated with variation in IR, obesity, and related traits.We identified extensive gene-expression changes in SM among the three Singaporean ethnicities and report specific genes and molecular pathways that might underpin and explain the differences in IR among these ethnic groups.

https://pubmed.ncbi.nlm.nih.gov/30137523