Adaptive evolution of interleukin-3 (IL3), a gene associated with brain volume variation in general human populations
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- 作者：Ming Li ; Liang Huang ; Kaiqin Li ; Yongxia Huo ; Chunhui Chen ; Jinkai Wang…
- 刊名：Human Genetics
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：135
- 期：4
- 页码：377-392
- 全文大小：4,985 KB
- 参考文献：Aiello L, Dean C (1990) An introduction to human evolutionary anatomy. Academic Press, London
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Liang Huang (2)
Kaiqin Li (1)
Yongxia Huo (1)
Chunhui Chen (3)
Jinkai Wang (4)
Jiewei Liu (4)
Zhenwu Luo (5)
Chuansheng Chen (6)
Qi Dong (3)
Yong-gang Yao (1)
Bing Su (4)
Xiong-jian Luo (1)
1. Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences and Yunnan Province, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, Yunnan, China
2. First Affiliated Hospital of Gannan Medical University, Ganzhou, 341000, Jiangxi, China
3. State Key Laboratory of Cognitive Neuroscience and Learning and IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing, 100875, China
4. State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, Yunnan, China
5. Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, SC, 29425, USA
6. Department of Psychology and Social Behavior, University of California, Irvine, CA, 92697, USA - 刊物类别：Biomedical and Life Sciences
- 刊物主题：Biomedicine
Human Genetics
Molecular Medicine
Internal Medicine
Metabolic Diseases - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-1203
文摘
Greatly expanded brain volume is one of the most characteristic traits that distinguish humans from other primates. Recent studies have revealed genes responsible for the dramatically enlarged human brain size (i.e., the microcephaly genes), and it has been well documented that many microcephaly genes have undergone accelerated evolution along the human lineage. In addition to being far larger than other primates, human brain volume is also highly variable in general populations. However, the genetic basis underlying human brain volume variation remains elusive and it is not known whether genes regulating human brain volume variation also have experienced positive selection. We have previously shown that genetic variants (near the IL3 gene) on 5q33 were significantly associated with brain volume in Chinese population. Here, we provide further evidence that support the significant association of genetic variants on 5q33 with brain volume. Bioinformatic analyses suggested that rs31480 is likely to be the causal variant among the studied SNPs. Molecular evolutionary analyses suggested that IL3 might have undergone positive selection in primates and humans. Neutrality tests further revealed signatures of positive selection of IL3 in Han Chinese and Europeans. Finally, extended haplotype homozygosity (EHH) and relative EHH analyses showed that the C allele of SNP rs31480 might have experienced recent positive selection in Han Chinese. Our results suggest that IL3 is an important genetic regulator for human brain volume variation and implied that IL3 might have experienced weak or modest positive selection in the evolutionary history of humans, which may be due to its contribution to human brain volume.