Myostatin and Follistatin Polymorphisms Interact with Muscle Phenotypes and Ethnicity

Department of Kinesiology, University of Connecticut, Storrs, CT 06269-2101, USA.
Medicine &amp Science in Sports &amp Exercise (Impact Factor: 4.46). 04/2009; 41(5):1063-1071. DOI: 10.1249/MSS.0b013e3181930337
Source: PubMed

ABSTRACT Purpose: We examined associations among myostatin (MSTN) 2379 A > G and 163 G > A and follistatin (FST) -5003 A > T and -833 G > T single nucleotide polymorphisms (SNP) on the muscle size and the strength response to resistance training (RT).
Methods: Subjects (n = 645, age = 24.1 ± 0.2 yr, body mass index [BMI] = 24.2 ± 0.2 kg·m-2) self-disclosed themselves as Caucasian (78.9%), African American (3.6%), Asian (8.4%), Hispanic (5.0%), or Other (4.2%). They were genotyped for MSTN 2379 A > G (n = 645), MSTN 163 G > A (n = 639), FST -5003 A > T (n = 580), and FST -833 G > T (n = 603). We assessed dynamic (one repetition maximum [1RM]) and isometric (maximum voluntary contraction [MVC]) muscle strength and size (cross-sectional area [CSA]) of the elbow flexors before and after 12 wk of unilateral upper-arm RT. Repeated-measures ANCOVA tested associations among genetic variants and muscle phenotypes with age and BMI as covariates.
Results: Baseline MVC was greater among African Americans who were carriers of the MSTN G2379 allele (AG/GG, n = 15) than the A2379A homozygotes (n = 8; 64.2 ± 6.8 vs 49.8 ± 8.7 kg). African Americans who were carriers of the FST T-5003 allele (n = 12) had greater baseline 1RM (11.9 ± 0.7 vs 8.8 ± 0.5 kg) and CSA (24.4 ± 1.3 vs 19.1 ± 1.2 cm2) than African Americans with the A-5003A genotype (n = 14; P < 0.05). No MSTN or FST genotype and muscle phenotype associations were found among the other ethnic groups (P ≥ 0.05).
Conclusion: MSTN 2379 A > G and FST -5003 A > T were associated with baseline muscle strength and size among African Americans only. These ethnic-specific associations are hypothesis generating and should be confirmed in a larger sample of African Americans.

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