1. ACTN3 genotype and physical function and frailty in an elderly Chinese population: the Rugao Longevity and Ageing Study.
- Author
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TENG MA, DEYI LU, YIN-SHENG ZHU, XUE-FENG CHU, YONG WANG, GUO-PING SHI, ZHENG-DONG WANG, LI YU, XIAO-YAN JIANG, and XIAO-FENG WANG
- Subjects
AGE distribution ,AGING ,ALLELES ,ANALYSIS of variance ,CHINESE people ,FRAIL elderly ,GENETIC polymorphisms ,GRIP strength ,LONGEVITY ,MULTIVARIATE analysis ,MUSCLE proteins ,REGRESSION analysis ,SEX distribution ,WALKING ,BODY movement ,GENOTYPES - Abstract
Objective: To examine the associations of the actinin alpha 3 gene (ACTN3) R577X polymorphism with physical performance and frailty in an older Chinese population. Methods: Data from 1,463 individuals (57.8% female) aged 70-87 years from the Rugao Longevity and Ageing Study were used. The associations between R577X and timed 5-m walk, grip strength, timed Up and Go test, and frailty index (FI) based on deficits of 23 laboratory tests (FI-Lab) were examined. Analysis of variance and linear regression models were used to evaluate the genetic effects of ACTN3 R577X on physical performance and FI-Lab. Results: The XX and RX genotypes of the ACTN3 R557X polymorphism accounted for 17.1 and 46.9%, respectively. Multivariate regression analysis revealed that in men aged 70-79 years, the ACTN3 577X allele was significantly associated with physical performance (5-m walk time, regression coefficient (β) = 0.258, P = 0.006; grip strength, β = -1.062, P = 0.012; Up and Go test time β = 0.368, P = 0.019). In women aged 70-79 years, a significant association between the ACTN3 577X allele and the FI-Lab score was observed, with a regression coefficient of β = 0.019 (P = 0.003). These findings suggest an age- and gender-specific X-additive model of R577X for 5-m walk time, grip strength, Up and Go Test time, and FI-Lab score. Conclusion: The ACTN3 577X allele is associated with an age- and sex-specific decrease in physical performance and an increase in frailty in an older population. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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