Genetic variation in hypoxia-inducible factor 1alpha and its possible association with high altitude adaptation in Sherpas.
Hypoxic stress at high altitude requires adaptations in several physiological functions to ensure the optimal oxygenation of all cells. Several lines of evidence suggested that high-altitude native populations such as Sherpas have been genetically adapted to their stressful environment. We investigated the genetic variation in the hypoxia-inducible factor (HIF)-1alpha gene in Sherpas as compared with Japanese, native lowlanders, and found a novel dinucleotide repeat polymorphism in intron 13 of the HIF-1alpha gene. GT15 allele was more frequent in Japanese than in Sherpas with statistical significance, while GT14 allele was significantly more frequent in Sherpas as compared with Japanese. A possible genetic variation in the HIF-1alpha gene might function in adaptation to living at high altitude. Because the activity of HIF-1 is regulated by multiple steps including the transcriptional level, the effect of the polymorphism in intron 13 on the cellular hypoxic responses remains to be elucidated.
Suzuki
K
K
Department of Molecular Predictive Medicine and Sport Science, Kyorin University, School of Medicine, Mitaka, Tokyo, Japan. kenjiszk@se.ritsumei.ac.jp
Kizaki
T
T
Hitomi
Y
Y
Nukita
M
M
Kimoto
K
K
Miyazawa
N
N
Kobayashi
K
K
Ohnuki
Y
Y
Ohno
H
H
D000222:Adaptation, Physiological / Q000235:genetics; D000293:Adolescent; D000328:Adult; D000483:Alleles; D000531:Altitude; D044466:Asian People / Q000235:genetics*; D001483:Base Sequence; D002883:Chromosomes, Human, Pair 14; D004268:DNA-Binding Proteins / Q000235:genetics*; D018900:Dinucleotide Repeats; D005260:Female; D005787:Gene Frequency; D014644:Genetic Variation; D006801:Humans; D051793:Hypoxia-Inducible Factor 1; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D007438:Introns; D008297:Male; D008875:Middle Aged; D009687:Nuclear Proteins / Q000235:genetics*; D011110:Polymorphism, Genetic; D017422:Sequence Analysis, DNA; D014157:Transcription Factors
D004268:DNA-Binding Proteins; C497442:HIF1A protein, human; D051793:Hypoxia-Inducible Factor 1; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D009687:Nuclear Proteins; D014157:Transcription Factors