吸烟会导致DNA突变
文章来源:未知 文章作者:enread 发布时间:2016-11-15 08:11 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
Smoking leaves an "archaeological record" of the hundreds of DNA1 mutations it causes, scientists have discovered.
 
科学家研究发现,吸烟会导致DNA突变,给人留下数百种基因突变的“永久记录”。
 
Having sequenced thousands of tumour2 genomes, they found a 20-a-day smoker3 would rack up an average of 150 mutations in every lung cell each year.
 
The changes are permanent, and persist even if someone gives up smoking.
 
Researchers say analysing tumour DNA may help explain the underlying4 causes of other cancers.
 
The study, in the journal Science, was carried out by an international group, including the Wellcome Trust Sanger Institute in Cambridgeshire and the Los Alamos National Laboratory in New Mexico.
 
The analysis shows a direct link between the number of cigarettes smoked in a lifetime and the number of mutations in tumour DNA.
 
The authors found that, on average, smoking a packet of cigarettes a day led to:
 
150 mutations in each lung cell every year
97 in the larynx or voice box
23 in the mouth
18 in the bladder
six in the liver
 
Joint5 lead author Prof Sir Mike Stratton, from the Wellcome Trust Sanger Institute, said: "The more mutations there are, the higher the chance that these will occur in the key genes6 that we call cancer genes, which convert a normal cell into a cancer cell."


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1 DNA 4u3z1l     
(缩)deoxyribonucleic acid 脱氧核糖核酸
参考例句:
  • DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
  • Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。
2 tumour tumour     
n.(tumor)(肿)瘤,肿块
参考例句:
  • The surgeons operated on her for a tumour.外科医生为她施行了肿瘤切除手术。
  • The tumour constricts the nerves.肿瘤压迫神经。
3 smoker GiqzKx     
n.吸烟者,吸烟车厢,吸烟室
参考例句:
  • His wife dislikes him to be a smoker.他妻子不喜欢他当烟民。
  • He is a moderate smoker.他是一个有节制的烟民。
4 underlying 5fyz8c     
adj.在下面的,含蓄的,潜在的
参考例句:
  • The underlying theme of the novel is very serious.小说隐含的主题是十分严肃的。
  • This word has its underlying meaning.这个单词有它潜在的含义。
5 joint m3lx4     
adj.联合的,共同的;n.关节,接合处;v.连接,贴合
参考例句:
  • I had a bad fall,which put my shoulder out of joint.我重重地摔了一跤,肩膀脫臼了。
  • We wrote a letter in joint names.我们联名写了封信。
6 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
TAG标签: DNA smoking mutations
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