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Eur J Hum Genet. 2008 Mar;16(3):391-4. Epub 2007 Nov 28.

The ACTN3 R577X nonsense allele is under-represented in elite-level strength athletes.

Author information

1
Department of Kinesiology, University of Maryland College Park School of Public Health, College Park, MD, USA. sroth1@umd.edu

Abstract

Previous reports have shown a lower proportion of the ACTN3 X/X genotype (R577X nonsense polymorphism) in sprint-related athletes compared to the general population, possibly attributed to impairment of muscle function related to alpha-actinin-3 deficiency. In the present study, we examined the frequency of the X/X genotype in both Black and White elite-level bodybuilders and strength athletes in comparison to the general population. A reference population of 668 Whites (363 men and 305 women) and 208 Blacks (98 men and 110 women) was genotyped for the ACTN3 R577X polymorphism. Strength athletes (52 white and 23 black; 4 women) consisting predominantly of world class and locally competitive bodybuilders, and elite powerlifters were recruited and similarly genotyped. Significantly lower X/X genotype frequencies were observed in the athletes (6.7%) vs controls (16.3%; P=0.005). The X/X genotype was significantly lower in White athletes (9.7%) vs controls (19.9%; P=0.018). No black athletes (0%) were observed with the X/X genotype, though this finding only approached statistical significance vs controls (4.8%; P=0.10). The results indicate that the ACTN3 R577X nonsense allele (X) is under-represented in elite strength athletes, consistent with previous reports indicating that alpha-actinin-3 deficiency appears to impair muscle performance.

PMID:
18043716
PMCID:
PMC2668151
DOI:
10.1038/sj.ejhg.5201964
[Indexed for MEDLINE]
Free PMC Article

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