To investigate genetic mechanisms of high altitude adaptations of animals living in the Tibetan Plateau, three mitochondrial genomes （mt-genome） of Tibetan horses living in Naqu （4,500 m） of Tibetan, Zhongdian （3...To investigate genetic mechanisms of high altitude adaptations of animals living in the Tibetan Plateau, three mitochondrial genomes （mt-genome） of Tibetan horses living in Naqu （4,500 m） of Tibetan, Zhongdian （3,300 m） and Deqin （3,100 m） of Yunnan province were sequenced. The structures and lengths of these three mt-genomes are similar to the Cheju horse, which is related to Tibetan horses, but little shorter than the Swedish horse. The pair-wise identity of these three horses on nucleotide level is more than 99.3%. When the gene encoding the mitochondrial protein of Tibetan horses was analyzed, we found that NADH6 has higher non-synonymous mutation rate in all of three Tibetan horses. This implies that NADH6 may play a role in Tibetan horses＇ high altitude adaptation. NADH6 is one of the subunits of the complex I in the respiratory chain. Furthermore, 7 D-loop sequences of Tibetan horse from different areas were sequenced, and the phylogeny tree was constructed to study the origin and evolutionary history of Tibetan horses. The result showed that the genetic diverse was high among Tibetan horses. All of Tibetan horses from Naqu were clustered into one clade, and Tibetan horses from Zhongdian and Deqin were clustered into others clades. The first molecular evidence of Tibetan horses indicated in this study is that Tibetan horse population might have multiple origins.展开更多
本研究旨在分析SpO_(2)/HCT比值作为高原习服性评估指标对高原习服与适应的预测价值.收集了西藏自治区某医院2347名接受常规体检的患者体检报告,并由高原病研究专家根据患者体检报告和问诊结果,将患者分为高原习服性组和高原不习服组.采...本研究旨在分析SpO_(2)/HCT比值作为高原习服性评估指标对高原习服与适应的预测价值.收集了西藏自治区某医院2347名接受常规体检的患者体检报告,并由高原病研究专家根据患者体检报告和问诊结果,将患者分为高原习服性组和高原不习服组.采用SpO_(2)/HCT指标作为高原习服性评估指标,并对两组进行比较.同时,分析高原习服性评估指标与慢性高原病(chronic mountain sickness,CMS)之间的相关性.使用受试者工作特征(receiver operating characteristic,ROC)曲线下面积(area under the curve,AUC)来评估高原习服性评估指标对高原习服良好与不良人群的诊断效能.通过SpO_(2)/HCT指标与世居者生理生化指标的关联,证明了SpO_(2)/HCT比值评估的准确性.本研究确认,SpO_(2)/HCT指标(altitude acclimatization/adaptation index,AAI)能够有效评估个体在高原的习服和适应水平.AAI=1.7228被确定为高原习服和适应的临界值,小于1.7228表示习服和适应不良,而大于等于1.7228表示习服和适应良好.AAI适用于高海拔移居者和世居者的高原习服或适应程度评估.展开更多
基金This work was supported by a grant from Special Foundation of President of the Chinese Academy of Sciences & the Grant of Sub-project of National Basic Research Program of China (No. 2006CB504103).
文摘To investigate genetic mechanisms of high altitude adaptations of animals living in the Tibetan Plateau, three mitochondrial genomes （mt-genome） of Tibetan horses living in Naqu （4,500 m） of Tibetan, Zhongdian （3,300 m） and Deqin （3,100 m） of Yunnan province were sequenced. The structures and lengths of these three mt-genomes are similar to the Cheju horse, which is related to Tibetan horses, but little shorter than the Swedish horse. The pair-wise identity of these three horses on nucleotide level is more than 99.3%. When the gene encoding the mitochondrial protein of Tibetan horses was analyzed, we found that NADH6 has higher non-synonymous mutation rate in all of three Tibetan horses. This implies that NADH6 may play a role in Tibetan horses＇ high altitude adaptation. NADH6 is one of the subunits of the complex I in the respiratory chain. Furthermore, 7 D-loop sequences of Tibetan horse from different areas were sequenced, and the phylogeny tree was constructed to study the origin and evolutionary history of Tibetan horses. The result showed that the genetic diverse was high among Tibetan horses. All of Tibetan horses from Naqu were clustered into one clade, and Tibetan horses from Zhongdian and Deqin were clustered into others clades. The first molecular evidence of Tibetan horses indicated in this study is that Tibetan horse population might have multiple origins.
文摘本研究旨在分析SpO_(2)/HCT比值作为高原习服性评估指标对高原习服与适应的预测价值.收集了西藏自治区某医院2347名接受常规体检的患者体检报告,并由高原病研究专家根据患者体检报告和问诊结果,将患者分为高原习服性组和高原不习服组.采用SpO_(2)/HCT指标作为高原习服性评估指标,并对两组进行比较.同时,分析高原习服性评估指标与慢性高原病(chronic mountain sickness,CMS)之间的相关性.使用受试者工作特征(receiver operating characteristic,ROC)曲线下面积(area under the curve,AUC)来评估高原习服性评估指标对高原习服良好与不良人群的诊断效能.通过SpO_(2)/HCT指标与世居者生理生化指标的关联,证明了SpO_(2)/HCT比值评估的准确性.本研究确认,SpO_(2)/HCT指标(altitude acclimatization/adaptation index,AAI)能够有效评估个体在高原的习服和适应水平.AAI=1.7228被确定为高原习服和适应的临界值,小于1.7228表示习服和适应不良,而大于等于1.7228表示习服和适应良好.AAI适用于高海拔移居者和世居者的高原习服或适应程度评估.
