為什么人類能夠說話而黑猩猩不能呢,？研究人員現(xiàn)在找到了答案,。他們認為，人類和黑猩猩身上都擁有的FOXP2基因不僅“長相”不同,，而且產(chǎn)生的氨基酸也不一樣,，這些差異造成了人類區(qū)別于黑猩猩的獨特語言能力。相關研究發(fā)表在11月12日的《自然》雜志上,。
人類和黑猩猩有95%到98.5%的基因一樣,。美國加州大學洛杉磯分校的丹·格施溫德團隊使用人類和黑猩猩的大腦組織分析了FOXP2的功能和工作情況。他們發(fā)現(xiàn),，F(xiàn)OXP2基因在人類語言功能形成過程中發(fā)揮著核心作用。這個基因會指導合成一種特殊蛋白質(zhì),，該蛋白質(zhì)又會與DNA（脫氧核糖核酸）結合,，對其他基因的功能造成影響。因此,，雖然實驗顯示這個基因的人類版本與黑猩猩版本只有兩處氨基酸不同,，但在同樣的培養(yǎng)環(huán)境下，該基因的人類版本會增強61個基因的作用,，同時抑制另外51個基因的作用,。
在這些受影響的基因中，一些與大腦發(fā)育有關,，F(xiàn)OXP2基因可以通過它們影響大腦中的語言功能區(qū)域和神經(jīng)網(wǎng)絡,。另一些受影響的基因與咽喉部位的軟組織發(fā)育有關,，F(xiàn)OXP2基因可以通過它們來影響與語言功能有關的器官結構。
研究人員認為,，這表明在人類獲得語言交流能力的進化歷程中,，F(xiàn)OXP2基因發(fā)揮了重要作用。這些發(fā)現(xiàn)有助于解釋為什么人類的大腦天生帶著說話和語言環(huán)路,，而黑猩猩卻沒有,。研究人員將進行深入研究，進一步揭示人類掌握語言的機制,。（生物谷Bioon.com）
有關語言能力研究：
Cell：將人類語言基因植入老鼠體內(nèi)
Science：將線路植入大腦解析語言系統(tǒng)工作機理
Neuropsychologia：男孩女孩用不同大腦區(qū)域處理語言信息
PNAS：語言與顏色認知有直接關系
PNAS：不同語言失讀癥患者腦構造不同
Current Biology：誦讀困難癥在不同語言中表現(xiàn)各異
生物谷推薦原始出處：
Nature 462, 213-217 (12 November 2009) | doi:10.1038/nature08549
Human-specific transcriptional regulation of CNS development genes by FOXP2
Genevieve Konopka1,3, Jamee M. Bomar1,3, Kellen Winden1,3, Giovanni Coppola3, Zophonias O. Jonsson5, Fuying Gao3, Sophia Peng3, Todd M. Preuss6, James A. Wohlschlegel5 & Daniel H. Geschwind1,2,3,4
1 Program in Neurogenetics,
2 Semel Institute and Department of Psychiatry,
3 Departments of Neurology,
4 Human Genetics, and,
5 Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, California 90095, USA
6 Division of Neuroscience and Center for Behavioral Neuroscience, Yerkes National Primate Research Center, and Department of Pathology & Laboratory Medicine, Emory University School of Medicine, Atlanta, Georgia 30329, USA
7 Correspondence to: Genevieve Konopka1,3Daniel H. Geschwind1,2,3,4 Correspondence and requests for materials should be addressed to G.K. or D.H.G.
The signalling pathways controlling both the evolution and development of language in the human brain remain unknown. So far, the transcription factor FOXP2 (forkhead box P2) is the only gene implicated in Mendelian forms of human speech and language dysfunction1, 2, 3. It has been proposed that the amino acid composition in the human variant of FOXP2 has undergone accelerated evolution, and this two-amino-acid change occurred around the time of language emergence in humans4, 5. However, this remains controversial, and whether the acquisition of these amino acids in human FOXP2 has any functional consequence in human neurons remains untested. Here we demonstrate that these two human-specific amino acids alter FOXP2 function by conferring differential transcriptional regulation in vitro. We extend these observations in vivo to human and chimpanzee brain, and use network analysis to identify novel relationships among the differentially expressed genes. These data provide experimental support for the functional relevance of changes in FOXP2 that occur on the human lineage, highlighting specific pathways with direct consequences for human brain development and disease in the central nervous system (CNS). Because FOXP2 has an important role in speech and language in humans, the identified targets may have a critical function in the development and evolution of language circuitry in humans.
