中国北方汉族男性雄激素受体基因(CAG)n多态分布及其与低氧训练效果的关联性研究

目的:探讨雄激素受体(AR)基因外显子1中(CAG)n多态在中国北方汉族男性中的分布特征及其与低氧训练后VO2max变化的关联性。方法:65名中国北方汉族健康青年男性进行为期30天HiHiLo(常压低氧)训练,晚上居住房间氧浓度为14.3~14.8%(模拟海拔2800~3000米),每周进行3次75%常氧VO2max的低氧训练,训练环境氧浓度约15.4%(模拟海拔约2500米)。实验前后测试体重和VO2max等指标,采用GeneScan和测序方法分析AR(CAG)n多态的等位基因(基因型)。结果:(1)共观察到(CAG)12、(CAG)16-28、(CAG)30共15种重复次数的等位基因(基因型),其中22次重复等位基因分布频率最高;(2)当分别以21和22次重复为分割点划分基因型时,短链组体重基础值均显著低于长链组;(3)当分别以21和22次重复为分割点划分基因型时,低氧训练后短链基因型携带者ΔVO2max和ΔrVO2max均显著高于长链组(P<0.01)。结论:中国北方汉族男性AR基因(CAG)n多态与HiHiLo(常压低氧)训练效果之间存在关联,重复次数较少基因型携带者的低氧训练敏感性较好。

Relation of CAG Repeat Polymorphism of AR Gene in Men of Han Nationality from Northern China to the Effectiveness of Hypoxic Training

Objective To investigate the distribution characteristics of (CAG)n polymorphism in the exonl of the androgen receptor (AR) gene and its relation to the sensitivity of hypoxic training in men of Han nationality from northern China. Methods Sixty five healthy young men of Han nationality completed HiHiLo training under simulated normobaric hypoxic environment for 4 weeks. They stayed under the condition of 14.3-14.8% O_2 (simulating 2800～3000m) during nighttime and carried out hypoxic training under the condition of 14.8-15.4% O_2 (simulating 2500～2800m) 3 times per week at the intensity of 75% individual VO_2max. VO_2max and body weight of the subjects were measured. GeneScan method was used to identify the repeat alleles (genotypes) of CAG polymorphism. Results (1) Fifteen alleles (CAG)12,(CAG)16-28,(CAG)30 repeat alleles (genotypes) were observed in the subjects, in which (CAG)22 was the most common allele; (2) When 21 and 22 alleles were used as the cut point, the baseline of body weight in those carrying shorter genotypes was significantly lower than that in those carrying longer genotypes; (3) △VO_2max and △rVO_2max in men carrying shorter genotypes were significantly higher than that in men carrying longer genotypes after hypoxic training. Conclusion The result reveals that AR (CAG)n polymorphism is associated with the sensitivity of simulated normobaric hypoxic HiHiLo training in men of Han nationality from northern China, especially in those carrying shorter genotypes of AR CAG.