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Scientists find neural stem cell regulator

时间：2012-04-17 05:13:18

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 　　WASHINGTON, April 16 (Xinhua) -- Researchers at the University of Colorado (CU) have found that lack of a specific gene1 interrupts neural2 tube closure, a condition that can cause death or paralysis3. The study was the cover story this week in the journal Genes4 & Development.

　　"The neural tube is the beginning of the brain and spinal5 cord, " said the study's lead investigator6 Lee Niswander, professor of pediatrics at the CU School of Medicine. "A defect in the mLin41 gene doesn't allow the tube to close because not enough neural progenitor7 cells are being made."
　　Niswander and the paper's first author, Jianfu Chen, made their findings while studying neural stem cells in mice. They said the cells use distinct self-renewal programs to meet the demand of tissue growth and repair during different stages of embryonic8 development. The molecular9 mechanisms10 that control these programs remain largely unknown.
　　The researchers discovered that the gene mLin41 in mice controls the extent of neural stem cell proliferation during the process of neural closure but not at the later stage of brain development. According to Chen, mLin41 works with small RNAs and RNA regulators that have never been investigated before in connection with neural tube formation.
　　"Our work opens up a whole other pathway toward understanding neural tube defects," Niswander said. "It's a new and significant piece of the puzzle behind understanding how this happens."

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1 gene WgKxx     
n.遗传因子，基因
参考例句：
  • A single gene may have many effects.单一基因可能具有很多种效应。
  • The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。
2 neural DnXzFt     
adj.神经的，神经系统的
参考例句：
  • The neural network can preferably solve the non- linear problem.利用神经网络建模可以较好地解决非线性问题。
  • The information transmission in neural system depends on neurotransmitters.信息传递的神经途径有赖于神经递质。
3 paralysis pKMxY     
n.麻痹(症)；瘫痪(症)
参考例句：
  • The paralysis affects his right leg and he can only walk with difficulty.他右腿瘫痪步履维艰。
  • The paralysis affects his right leg and he can only walk with difficulty.他右腿瘫痪步履维艰。
4 genes 01914f8eac35d7e14afa065217edd8c0     
n.基因( gene的名词复数 )
参考例句：
  • You have good genes from your parents, so you should live a long time. 你从父母那儿获得优良的基因，所以能够活得很长。 来自《简明英汉词典》
  • Differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。 来自英汉非文学 - 生命科学 - 生物技术的世纪
5 spinal KFczS     
adj.针的，尖刺的，尖刺状突起的；adj.脊骨的，脊髓的
参考例句：
  • After three days in Japan,the spinal column becomes extraordinarily flexible.在日本三天，就已经使脊椎骨变得富有弹性了。
  • Your spinal column is made up of 24 movable vertebrae.你的脊柱由24个活动的脊椎骨构成。
6 investigator zRQzo     
n.研究者，调查者，审查者
参考例句：
  • He was a special investigator for the FBI.他是联邦调查局的特别调查员。
  • The investigator was able to deduce the crime and find the criminal.调查者能够推出犯罪过程并锁定罪犯。
7 progenitor 2iiyD     
n.祖先，先驱
参考例句：
  • He was also a progenitor of seven presidents of Nicaragua.他也是尼加拉瓜7任总统的祖先。
  • Schoenberg was a progenitor of modern music.勋伯格是一位现代音乐的先驱。
8 embryonic 58EyK     
adj.胚胎的
参考例句：
  • It is still in an embryonic stage.它还处于萌芽阶段。
  • The plan,as yet,only exists in embryonic form.这个计划迄今为止还只是在酝酿之中。
9 molecular mE9xh     
adj.分子的；克分子的
参考例句：
  • The research will provide direct insight into molecular mechanisms.这项研究将使人能够直接地了解分子的机理。
  • For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时，分子的碰撞就停止了。
10 mechanisms d0db71d70348ef1c49f05f59097917b8     
n.机械( mechanism的名词复数 )；机械装置；[生物学] 机制；机械作用
参考例句：
  • The research will provide direct insight into molecular mechanisms. 这项研究将使人能够直接地了解分子的机理。 来自《简明英汉词典》
  • He explained how the two mechanisms worked. 他解释这两台机械装置是如何工作的。 来自《简明英汉词典》

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