- Research article
- Open Access
AMPD1rs17602729 is associated with physical performance of sprint and power in elite Lithuanian athletes
BMC Genetics volume 15, Article number: 58 (2014)
The C34T genetic polymorphism (rs17602729) in the AMPD1 gene, encoding the skeletal muscle-specific isoform of adenosine monophosphate deaminase (AMPD1), is a common polymorphism among Caucasians that can impair exercise capacity. The aim of the present study was twofold: (1) to determine the C34T AMPD1 allele/genotype frequency distributions in Lithuanian athletes (n = 204, stratified into three groups: endurance, sprint/power and mixed) and compare them with the allele/genotype frequency distributions in randomly selected healthy Lithuanian non-athletes (n = 260) and (2) to compare common anthropometric measurements and physical performance phenotypes between the three groups of athletes depending on their AMPD1 genotype.
The results of our study indicate that the frequency of the AMPD1 TT genotype was 2.4% in the control group, while it was absent in the athlete group. There were significantly more sprint/power-orientated athletes with the CC genotype (86.3%) compared with the endurance-orientated athletes (72.9%), mixed athletes (67.1%), and controls (74.2%). We determined that the AMPD1 C34T polymorphism is not associated with aerobic muscle performance phenotype (VO2max). For CC genotype the short-term explosive muscle power value (based on Vertical Jump test) of athletes from the sprint/power group was significantly higher than that of the endurance group athletes (P < 0.05). The AMPD1 CC genotype is associated with anaerobic performance (Vertical Jump).
The AMPD1 C allele may help athletes to attain elite status in sprint/power-oriented sports, and the T allele is a factor unfavourable for athletics in sprint/power-oriented sports categories. Hence, the AMPD1 C allele can be regarded as a marker associated with the physical performance of sprint and power. Replications studies are required to confirm this association.
Physical performance is complex and includes the interaction of genetic and environmental factors. With the rapid development of molecular research in sport, multiple genetic markers associated with physical performance have been discovered (among them are: ACE, ACTN3, AMPD1, ADRB2, GDF-8, NOS3, PPARGC1A, PPARA, HIF1, MtDNA markers, etc.) [1–3]. It should be however emphasised that, besides ACTN3, most sports genetics studies have not yet been replicated in independent samples.
Adenosine monophosphate deaminase (AMPD) is a very important regulator of muscle energy metabolism during exercise [5–7]. AMPD displaces the equilibrium of the myokinase reaction toward ATP production (2 ADP ↔ ATP + AMP) by converting AMP to inosine monophosphate (IMP) [5–9]. Moreover, the AMPD reaction is the initial reaction of the purine nucleotide cycle and plays a central role in the salvage of adenine nucleotides as well as the determination of energy charge [7, 8]. Other important functions of the purine nucleotide cycle are the deamination of amino acids and the regulation of the glycolytic pathway by the formation of ammonia and IMP [7–9].
It has been shown that physical activity lowers skeletal muscle AMPD activity. Furthermore, AMPD expression in skeletal muscle is dependent on muscle fibre composition [5, 7–9]. In a sprint training study, a decrease in AMPD activity was reported concurrent with an increase in the proportion of fast-twitch (type II) fibres. Therefore, AMPD expression appears to be influenced by the intensity of physical activity [10–12]. The muscle-specific isoform of AMPD (adenosine monophosphate deaminase-1 (AMPD1), also known as myoadenylate deaminase) predominates in all skeletal muscle fibres. The gene encoding this isoform (AMPD1) is located on chromosome 1 (1p13). AMPD1 is mainly expressed in fast-twitch (type II) muscle fibres. Differential AMPD1 gene expression may contribute to quantitative variations in enzyme activity across muscle groups with different types of fibres [8–10]. The nonsense mutation c.34C > T (C to T transition in nucleotide 34, p.Gln12X, rs17602729) in exon 2 of the AMPD1 gene converts glutamine codon (CAA) into the premature stop codon (TAA), which results in the early interruption of protein synthesis and appears to be the main cause of AMPD deficiency [1–14]. According to the 1000 Genomes project, the polymorphism of the AMPD1 was found at a frequency of 11% in European Caucasians (11% in Finland, 14% in England and Spain, and 8% in Italy), 1% in Africans, and 8% in Americans surveyed but was not present in any Asian populations (http://www.1000genomes.org/).
Studies have shown, part of the population who express the mutant AMPD1 T allele (2% of the Caucasian population are homozygous [TT genotype] and approximately 20% are heterozygous [CT genotype]) are vulnerable to muscular cramps, pain, and premature fatigue during exercises [4, 11, 15, 16]. Tarnopolsky et al.  suggested that the mutation of the AMPD1 might be a harmless genetic variant . Individuals with AMPD1 deficiency (TT genotype) have extremely low skeletal muscle AMPD activity, heterozygous (CT genotype) individuals have intermediate AMPD activity, and homozygous individuals with normal AMPD1 alleles (CC genotype) have high AMPD activity [9, 10]. Moreover, force-generating capacity during repetitive submaximal isometric muscle contractions was shown to be reduced in subjects with AMPD1 deficiency compared with sedentary controls . Colombini et al.  have found that in elite endurance athletes the frequency of the AMPD1 mutant T allele is lower than in controls from the general population . However since no differences in indicators of endurance performance were found between athletes with different genotypes, it was concluded that the AMPD1 C34T variation does not significantly impair endurance performance [5, 18]. Furthermore, two studies reported low frequency of the T allele in a group of top-level Spanish male endurance athletes  and Polish rowers  compared with controls. Several studies have shown that power-oriented athletes have a significantly lower frequency of the AMPD1 T allele than controls [7, 14]. Varying findings reported by different groups of researchers show that at this point there is no consensus on the actual effect of AMPD1 polymorphisms on athletic performance.
Therefore the purpose of the present study was twofold. First, we determined the frequency distribution of the AMPD1 C34T alleles and genotypes in a group of Elite Lithuanian athletes. This group was compared with randomly selected healthy Lithuanian non-athletes. The second aim of this study was to compare common anthropometric measurements and laboratory indexes of muscle strength and endurance performance between the groups of athletes depending on their AMPD1 genotype.
The distribution of AMPD1 C34T polymorphism genotype and allele frequencies in 204 Lithuanian athletes was compared to 260 healthy untrained individuals. Data of genotype and allele distribution analysis is presented in Table 1.
Results showed that the AMPD1 C34T genotype distribution was in line with Hardy-Weinberg equilibrium within all groups (P > 0.05). AMPD1 genotype frequencies were significantly different between the total athlete group (74.2% CC; 24.9% CT; 0% TT) and the control group (72.2% CC; 25.5% CT; 2.4% TT; P = 0.025) (Table 1). The frequency of homozygous TT genotypes was 2.4% in the control group. The TT genotype was completely absent in the athlete group. There was a significantly lower frequency of the T allele in the sprint/power-orientated athletes (4.3%) compared with the mixed athletes (16.4%) and controls (16.0%). There were significantly more sprint/power-orientated athletes with the AMPD1 CC genotype (86.3%) compared with the endurance athletes (72.9%), mixed athletes (67.1%), and controls (74.2%) (Table 1). Analysis of the distribution of AMPD1 alleles between genders in the athlete and control groups revealed no significant differences.
Since the AMPD1 TT genotype was completely absent in the athlete group, only CT and CC genotypes were used for further analysis. The phenotypical variables of the control group were not measured due to various limitations. The differences between the mean values of the phenotypical variables were analysed with respect to gender and sports groups.
Irrespective of the AMPD1 genotype, the mean values of anaerobic power parameters — anaerobic alactic muscular power (AAMP), right and left hand grip strength (LGS and RGS) — were significantly higher for males compare to females (P < 0.01) (Table 2). Males carriers of the AMPD1 CC genotype had significantly lower fat mass than female athletes. Other important anthropometric variables including height, weight, body mass index (BMI), muscle mass; anaerobic power variable —short-term explosive muscle power (STEMP), and aerobic parameter maximum oxygen uptake (VO2max) were significantly higher in the male CC genotype athletes (P < 0.02). The latter results confirm a physiological gender difference between phenotypic values. Therefore, as the next step, we compared male and female differences between the AMPD1 CC and CT genotypes separately. The only significant statistical difference was obtained for STEMP in the subgroup of male athletes. Males carriers of the AMPD1 CC genotype had higher STEMP compared to the CT genotype male athletes (2010.4 ± 486.2W vs. 1790.2 ± 489.4W; P = 0.018).
ANOVA results revealed that irrespective of the AMPD1 genotype, the sprint/power group athletes had on average higher muscle mass, handgrip strength, STEMP, and AAMP than the mixed group (P < 0.006) (Table 3). Average muscle mass, handgrip strength, and AAMP values were also significantly different between the endurance athletes and the mixed group (P < 0.0001) irrespective of the genotype. For the AMPD1 CC genotype athletes, average STEMP value of the sprint/power group was significantly higher than the endurance group (P < 0.0001), while for the CT genotype average STEMP value of the endurance group was significantly higher than the mixed group (P < 0.0001) (Table 3). Comparison of the phenotypic characteristics of the sports groups, specifically the AMPD1 CC and CT genotype athletes, revealed that sprint/power athletes carrying the CC genotype had significantly lower handgrip strength compared with CT genotype athletes (P < 0.05), and mixed athletes carrying the AMPD1 CC genotype had higher handgrip strength and STEMP compared with the CT genotype athletes (P < 0.03).
We estimated post hoc the statistical power of the Chi-square and ANOVA tests employed in our study by G*power software. We used medium effect size recommended in G*power program and the significance level alpha = 0.05.
Given medium effect size w = 0.3, the power calculation of Chi-square tests for differences in allele frequencies between the athletes and the controls yielded: power = 1.00 for total sample size n = 464 (204 athletes + 260 controls). The empirical power of the Chi-square tests for differences between the allele frequencies in different sport groups was equal to 0.98 and respectively for genotype differences - 0.95.
The empirical power of the ANOVA test for the mean differences of Lithuanian athletes’ phenotypic indexes between three different sport groups for the medium effect size f = 0.25 and the total number of athletes with AMPD1 CC genotype (n = 154) calculated by G*power was 0.79. The empirical power for AMPD1 CT genotype group (n = 50) is low and equal to 0.32.
We used G*power to estimate the empirical effect size of the ANOVA test for all phenotypic variables between sports groups separately for AMPD1 CC and CT genotypes. For AMPD1 CC and CT genotypes, average empirical effect size was 0.37 and 0.71 respectively. Assuming the empirical effect size as true one, with alpha = 0.05, we obtain that the empirical power is higher than 0.84 and sample size is sufficient to detect large effect size for almost all phenotypic variables except VO2max (for CC and CT genotypes), fat mass (CC genotype), height (CT genotype). In order to achieve the power of 0.8 for the latter variables, the sample size should be larger as 1000 which is beyond the possibilities of Lithuanian athletes’ population.
Elite athletic status is a polygenic trait with multiple candidate gene variants playing a certain role, either alone or through complex, gene-gene and gene-environment interactions. In the present study, we investigated the association between AMPD C34T polymorphism (rs17602729) and athletic performance in elite Lithuanian athletes group. We chose the AMPD1 C34T polymorphism due to possible associations with the various aspects of muscle function and capacity that were reported in Introduction. It is a view shared among many researchers that this gene variation has an impact on human physical characteristics [1, 5, 7, 12].
The main findings of the present study were: (i) a significantly lower frequency of the AMPD1 T allele among the investigated group of elite Lithuanian sprint/power athletes compared to sedentary controls; and (ii) the AMPD1 CC genotype is associated with anaerobic muscle performance (Vertical Jump). These results are in accordance with previous studies showing that C allele of the AMPD1 gene is associated with anaerobic performance [5, 7, 8, 12].
The C34T polymorphism in the AMPD1 gene encoding for the skeletal muscle-specific isoform of AMP deaminase (AMPD1) is a common variation among Caucasians that can impair exercise capacity . Approximately 2% of the general Caucasian population who are homozygous for AMPD1 rare T alleles (TT genotype) exhibit a skeletal muscle AMPD1 deficiency [7, 9].
Results of this study show that the frequency of TT homozygotes in the control group was 2.4%, but none were found among the athletes. We determined the frequency of the T allele to be 16.0% in the control group (in line with other European Caucasian populations) and only 4.3% in sprint/power athletes (P = 0.039). There were significantly more sprint/power athletes with the AMPD1 CC genotype (86.3%) compared with the endurance athletes (72.9%), mixed athletes (67.1%), and controls (74.2%) (P < 0.025). These results support the association of the C allele with sprint/power performance. Our data on the predominance of the AMPD1 C allele and CC genotype in sprint/power athletes was in line with the results of other studies on the association of AMPD1 C34T and anaerobic muscle performance [5, 7, 8].
The potential favourable effect of the AMPD1 wild-type alleles (CC genotype carriers) on elite sprint power athletic status was additionally supported by the finding that the sprint/power elite athletes with AMPD1 CC genotype achieved better results in nearly all sprint and power measurements. However, it must be emphasized that no Lithuanian athlete had the TT genotype. Reasons for this striking finding are unclear. We consider that the results of our study are overall sound, as all of the following criteria were met the primary validity criteria for association study : cases (athletes) clearly presented the main study phenotype (i.e. being an elite athlete); genetic assessment were accurate and unbiased; participants within groups were ethnically-matched; and genotype distributions were in HWE in the control (general Lithuanian population) and athletes' groups.
Our study has limitations. Our group of elite athletes was somewhat small, especially after the stratification according to the sports’ category. However considering that there is a limited number of elite athletes in Lithuania, we were unable to recruit additional individuals for this study.
We investigated phenotypes that are related to physical performance to begin creating a chain of evidence linking AMPD1 C34T to success in sports. Because the AMPD1 TT genotype was absent in the group of athletes, only CT (n = 50) and CC (n = 154) genotyped athletes were used for the analysis. Aerobic capacity was determined using maximum oxygen uptake (VO2max), which is widely accepted as the single best measure of cardiovascular fitness and maximal aerobic power. Instantaneous or explosive power in the lower extremities was measured by a vertical jump test and stair-climbing test (short-term power is the work performed over a brief period of time using maximal effort). Maximal isometric power of the forearm muscles was measured using handgrip strength. These are very rapid movements that are dependent on anaerobic energy use in the muscles and primarily reliant on creatine phosphate. Strength and anaerobic power tests are performance tests most indicative of muscle properties and have been proved to have a significant genetic component . The AMPD1 skeletal enzyme is a very important regulator of muscle energy metabolism during exercise. AMPD1 is activated during short-term, high-intensity exercise, when the rate of ATP use exceeds the cell’s potential to resynthesize it . Previous studies have shown that individuals with the AMPD1 TT genotype exhibit low AMPD1 activity and a faster accumulation of blood lactate during early recovery from a 30-s sprint exercise [8, 9]. Fischer et al.  revealed a faster power decrease in TT genotype carriers during the 30-s Wingate cycling test . In a study done by Rico-Sanz et al. , individuals with the AMPD1 TT genotype had diminished exercise capacity and cardiorespiratory responses to exercise in a sedentary state. Furthermore, the training response of ventilatory phenotypes during maximal exercise was lower in AMPD1 TT genotype carriers .
Our results demonstrated that the sprint/power athletes with AMPD1 wild-type alleles (CC genotype carriers) achieved better results in nearly all sprint and power measurements. AMPD1 CC genotyped athletes’ from the sprint/power group had an average STEMP value (based on the vertical jump test) significantly higher than endurance group athletes with the same genotype (P < 0.05). Interestingly, we found that athletes in the mixed group (utilising mixed anaerobic and aerobic energy production) carrying the AMPD1 CC genotype had higher handgrip strength and STEMP than the CT genotype athletes in the same group (P < 0.05).
Our results confirm physiological gender-dependant differences between phenotypic values. AMPD1 wild-type C allele homozygous males had higher STEMP than the CT genotype male athletes (P < 0.05). Indeed, gender is another factor affecting skeletal muscle AMPD1 activity. Norman (1998) revealed that on average 14–18% higher AMPD1 activities are found in the skeletal muscle of males compared with females . This is similar to what has been observed for other enzymes such as lactate dehydrogenase and phosphofructokinase and suggests a coupling between AMPD1 activity and glycolytic capacity of human skeletal muscles . Our study has confirmed this observation. A statistically significant difference was obtained for the anaerobic STEMP test in the subgroup of CC-genotyped male athletes.
Based on this information, it would appear that the AMPD1 C allele is favourable for sprint/power performance. This finding is consistent with previous studies that have reported association between the AMPD1 C allele and status of sprint/power athletes [5, 7, 8, 12].
Our results demonstrated no association for the AMPD1 C34T polymorphism and aerobic performance phenotype (VO2max). Although the latter partly are not significant due to limited sample size, there are other studies those support the same findings. Rico-Sanz et al. found no significant differences between AMPD1 CC and CT genotype athletes in the VO2max values attained by previously sedentary individuals .
The results of this study indicate that the effect of the C34T variation of the AMPD1 gene is essential during intense exercise. Our data indicates that the presence of the AMPD1 C allele, in conjunction with other environmental and genetic factors, predicts anaerobic capacity.
Our data suggest that the AMPD1 C allele may help athletes to attain elite status in sprint/power-oriented sports. Differences in the distribution of AMPD1 C34T genotypes in the athletes examined and controls and a lower frequency of allele T in sprint/power athletes suggest that allele T is a factor unfavourable for athletics in sprint/power-oriented sports categories. The results indicate the relationship between the AMPD1 gene C34T variation and muscular activity in an anaerobic mode in humans. Hence, the AMPD1 C allele can be regarded as one of the markers associated with the performance of sprint and power.
The results provide novel information about the AMPD1 molecular mechanisms behind physical performance. However, it should be noted that these findings need to be replicated in larger cohorts to confirm the associations. In addition, new physiological and molecular mechanisms behind adaptations to exercise training may be found by studying the genes affecting physical performance. It is important to clarify that although the AMPD1 gene and the polymorphisms within this gene are important for physical capacity phenotypes, they are not products of a single gene exclusively, because they also heavily depend on composition of muscle fibre, training status, gender, and other environmental and genetic factors.
The Lithuanian Bioethics Committee approved the study and written informed consent was obtained from each participant.
The study involved 204 athletes (aged 22.0 ± 6.3 years) and 260 controls (healthy unrelated individuals [aged 36.2 ± 7.2 years] from six ethno-linguistic Lithuanian groups). The athletes and control groups were all Caucasians. The 204 elite athletes studied (160 male and 44 female) consisted of Olympic candidates and athletes who had participated in international competitions and had no less than 7 years of experience in their sports categories. The athletes were stratified into three groups according to the duration and distance of the event, in sports disciplines that ranged from endurance-oriented to power-oriented sports. The endurance group (n = 84) included very long (race duration >30 min), long (race duration 5–30 min), and medium (race duration 45 s to 5 min) distance athletes: skiers, road cyclists, biathletes, long-distance runners, modern pentathletes, swimmers, and rowers. The sprint/power group (n = 47) included sprinters and other power athletes with predominantly anaerobic energy production: sprinters, jumpers and throwers. The mixed group (n = 73) comprised athletes whose sports utilized mixed anaerobic and aerobic energy production: wrestlers, tennis players, handball players, and footballers.
Body height was measured to the nearest 0.01 m with the subject standing with their back to a wall-mounted stadiometer. Weight was measured to the nearest 0.1 kg with calibrated scales. Body mass index (BMI; in kg/m2) was calculated. Highly trained athletes may have a high BMI because of increased muscularity rather than increased body fat. Total body fat mass (FM, in kg) was determined by measuring the size of the thickest regions of the forearm, humeral area, thigh, and calf and by using a calliper to measure the thickness of the skin, thus determining the amount of subcutaneous fat .
Muscle strength measurements
Anaerobic power was determined with three different tests using the technique recommended by Brown and Weir . Short-term explosive muscle power (STEMP, vertical jump test, in W) was measured by asking the subject to perform a maximal vertical jump (on a contact platform), and the power output expressed per unit of body weight was measured according to Bosco procedures and modifications by Linthorne . Anaerobic alactic muscular power (AAMP, in W) was estimated by a stair-climbing test proposed by Margaria [23–25]. Maximal isometric power of the forearm muscles (handgrip test) was measured according to the procedures described by Mathiowetz et al., with an adjustable mechanical hand dynamometer and expressed in kilograms (kg). For convenience, we denote left and right hand grip strength as LGS and RGS respectively [21, 26].
Measurements of endurance performance
Aerobic capacity was determined by using maximum oxygen consumption (VO2max). VO2max refers to the maximum amount of oxygen that an individual can utilise during maximal or exhaustive exercise. It is measured as millilitres of oxygen used in 1 minute per kilogram of body weight (ml/kg/min). The gas exchange was measured using a facemask apparatus attached to a continuous, breath-by-breath monitoring system (Oxycon Mobile, Germany). The athletes were evaluated while pedalling on a cycle ergometer (Ergoselect 100 P, Germany) or running on a treadmill (Cosmos Mercury, Germany) according to an incremental procedure until exhaustion. Oxygen uptake, pulmonary ventilation, ventilatory equivalents for oxygen and carbon dioxide, and end-tidal partial pressure of oxygen and carbon dioxide were measured during each test.
All assessments were carried out by trained individuals according to a standardised procedure. Each participant was given two attempts (before and after the preparation period for the most important competitions) and the best attempts were used in the analyses.
Genomic DNA was extracted from peripheral blood leukocytes by the standard phenol-chloroform extraction method. Genotyping of the AMPD1 (rs17602729) polymorphism was performed using polymerase chain reaction (PCR). The resulting PCR products were genotyped by restriction fragment length polymorphism analysis. The AMPD1 polymorphism was amplified using PCR forward, 5'-CTTCATACAGCTGAAGAGACA-3' and reverse, 5'-GAATCCAGAAAAGCCATGAGC-3' primers as recommended by Norman et al. . The amplified fragment subsequently underwent digestion by NspI endonuclease (Thermo Scientific Fermentas, Lithuania). Digested PCR fragments (216 bp fragments for C allele and 194 bp with 22 bp for T allele) were separated by 2% agarose gel electrophoresis, stained with ethidium bromide, and viewed in UV light.
Deviation from the Hardy-Weinberg equilibrium was statistically evaluated. Distribution differences between allele and genotype frequencies were tested using chi-square or Fisher’s exact tests. The average differences for each genotype of Lithuanian athletes’ phenotypic indexes were evaluated by using Student’s t-test or one-way dispersion analysis (ANOVA). The post-hoc Bonferroni test was applied for multiple comparisons between groups. All phenotypic values (quantitative variables) are presented as the mean ± standard deviation (SD). P-values less than 0.05 were considered statistically significant. The IBM SPSS (v.21) statistical software package was used to obtain the results. We estimated post hoc power of the Chi-square and ANOVA tests assuming medium effect size by G*power software .
Anaerobic alactic muscular power
Adenosine monophosphate deaminase 1 gene
One-way dispersion analysis
Body mass index
Left hand grip strength
Right hand grip strength
Short-term explosive muscle power
Maximum oxygen uptake.
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We would like to thank professor Vaidutis Kučinskas from Department of Human and Medical Genetics, Faculty of Medicine, Vilnius University for providing us with valuable ideas and giving us access to the control samples. We thank Mr. Alan Lee Hendrixson for editing our English language and Mr. T. Kačergis for the technical help. We would also like to thank the athletes for agreeing to participate in our study without whom this research would not be possible.
The authors declare they have no competing interests.
VG, AP performed the genotyping and drafted the manuscript. AJ assisted in the statistical analysis of the data and drafted the manuscript. VG, LT and AU were involved in the recruitment of the study subjects and participated in study design and co-ordination. KM investigated anthropometric measurements and phenotypes that are related to physical performance. All authors read and approved the final manuscript.
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Ginevičienė, V., Jakaitienė, A., Pranculis, A. et al. AMPD1rs17602729 is associated with physical performance of sprint and power in elite Lithuanian athletes. BMC Genet 15, 58 (2014). https://doi.org/10.1186/1471-2156-15-58
- Myoadenylate deaminase
- Genetic polymorphism
- Sprint and power