试管受精新技术可能规避新生儿先天疾病
文章来源:未知 文章作者:enread 发布时间:2014-03-02 02:54 字体: [ ]  进入论坛
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美国食品和药物管理局日前举行了一场听证会,以探讨一项旨在规避新生儿先天疾病风险的试管受精新技术是否能够进入人体实验阶段。借助这一新技术孕育的试管婴儿将有“一父两母”,并且此项产前基因操纵技术可能会使“定制婴儿”成真。
 
A new technology aimed at eliminating genetic2 disease in newborns would combine the DNA3 of three people, instead of just two, to create a child, potentially redrawing ethical4 lines for designer babies.
 
The process works by replacing potentially variant5 DNA in the unfertilized eggs of a hopeful mother with disease-free genes7 from a donor8. US regulators today will begin weighing whether the procedure, used only in monkeys so far, is safe enough to be tested in humans.
 
Because the process would change only a small, specific part of genetic code, scientists say a baby would largely retain the physical characteristics of the parents. Still, DNA from all three -- mother, father and donor -- would remain with the child throughout a lifetime, opening questions about long-term effects for this generation, and potentially the next. Ethicists worry that allowing pre-birth gene1 manipulation may one day lead to build-to-order designer babies.
 
"Once you make this change, if a female arises from the process and goes on to have children, that change is passed on, so it's forever," Phil Yeske, chief science officer of the United Mitochondrial Disease Foundation, said by telephone. "That's uncharted territory; we just don't know what it means. Permanent change of the human germline has never been done before, and we don't know what will happen in future generations."
 
FDA Hearing
 
The Food and Drug Administration is scheduled today and tomorrow to explore the issue at a meeting, with doctors and researchers scheduled to talk. The FDA will then decide whether to allow scientists at Oregon Health & Science University in Portland, who engineered the approach, to move their testing program from macaque monkeys to woman.
 
Potentially, the procedure may cut off mitochondrial diseases that are passed down through females and occur in about 1 in 4,000 people. One example is Melas syndrome9, which causes a person to have continuing small strokes that damage their brains, leading to vision loss, problems with movement, dementia and death, according to the National Institutes of Health.
 
"What the FDA needs to think about is that this isn't a procedure to repair mitochondrial disease," said Vamsi Mootha, a professor of systems biology and medicine at Harvard Medical School inBoston who studies mitochondrial disorders10. "It's designed to prevent disease. It's designed to offer a woman who's a carrier for disease more options."
 
Shoukhrat Mitalipov, the researcher heading the Oregon team's work, declined to comment before the FDA meeting.
 
Earlier Method
 
From 1997 to 2003, about 30 children worldwide were born using a method that injected donor mitochondria DNA into eggs after they were fertilized6. The first baby born with this technique wasreported in 1997. In 2003, though, the FDA told fertility clinics that genetically11 manipulated embryos12 were considered a biological product, and subject to regulation, essentially13 halting the technique in humans.
 
The lives of those children should be thoroughly14 investigated before the new procedure is cleared for use in a human trial, said Sheldon Krimsky, a professor of Urban & Environmental Policy & Planning at Tufts University in Boston.


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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 genetic PgIxp     
adj.遗传的,遗传学的
参考例句:
  • It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
  • Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。
3 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。
4 ethical diIz4     
adj.伦理的,道德的,合乎道德的
参考例句:
  • It is necessary to get the youth to have a high ethical concept.必须使青年具有高度的道德观念。
  • It was a debate which aroused fervent ethical arguments.那是一场引发强烈的伦理道德争论的辩论。
5 variant GfuzRt     
adj.不同的,变异的;n.变体,异体
参考例句:
  • We give professional suggestions according to variant tanning stages for each customer.我们针对每位顾客不同的日晒阶段,提供强度适合的晒黑建议。
  • In a variant of this approach,the tests are data- driven.这个方法的一个变种,是数据驱动的测试。
6 Fertilized 0f66e269f3e72fa001554304e59712da     
v.施肥( fertilize的过去式和过去分词 )
参考例句:
  • The study of psychology has recently been widely cross-fertilized by new discoveries in genetics. 心理学研究最近从遗传学的新发现中受益匪浅。
  • Flowers are often fertilized by bees as they gather nectar. 花常在蜜蜂采蜜时受粉。
7 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
8 donor dstxI     
n.捐献者;赠送人;(组织、器官等的)供体
参考例句:
  • In these cases,the recipient usually takes care of the donor afterwards.在这类情况下,接受捐献者以后通常会照顾捐赠者。
  • The Doctor transplanted the donor's heart to Mike's chest cavity.医生将捐赠者的心脏移植进麦克的胸腔。
9 syndrome uqBwu     
n.综合病症;并存特性
参考例句:
  • The Institute says that an unidentified virus is to blame for the syndrome. 该研究所表示,引起这种综合症的是一种尚未确认的病毒。
  • Results indicated that 11 fetuses had Down syndrome. 结果表明有11个胎儿患有唐氏综合征。
10 disorders 6e49dcafe3638183c823d3aa5b12b010     
n.混乱( disorder的名词复数 );凌乱;骚乱;(身心、机能)失调
参考例句:
  • Reports of anorexia and other eating disorders are on the increase. 据报告,厌食症和其他饮食方面的功能紊乱发生率正在不断增长。 来自《简明英汉词典》
  • The announcement led to violent civil disorders. 这项宣布引起剧烈的骚乱。 来自《简明英汉词典》
11 genetically Lgixo     
adv.遗传上
参考例句:
  • All the bees in the colony are genetically related. 同一群体的蜜蜂都有亲缘关系。
  • Genetically modified foods have already arrived on American dinner tables. 经基因改造加工过的食物已端上了美国人的餐桌。 来自英汉非文学 - 生命科学 - 基因与食物
12 embryos 0e62a67414ef42288b74539e591aa30a     
n.晶胚;胚,胚胎( embryo的名词复数 )
参考例句:
  • Somatic cells of angiosperms enter a regenerative phase and behave like embryos. 被子植物体细胞进入一个生殖阶段,而且其行为象胚。 来自辞典例句
  • Evolution can explain why human embryos look like gilled fishes. 进化论能够解释为什么人类的胚胎看起来象除去了内脏的鱼一样。 来自辞典例句
13 essentially nntxw     
adv.本质上,实质上,基本上
参考例句:
  • Really great men are essentially modest.真正的伟人大都很谦虚。
  • She is an essentially selfish person.她本质上是个自私自利的人。
14 thoroughly sgmz0J     
adv.完全地,彻底地,十足地
参考例句:
  • The soil must be thoroughly turned over before planting.一定要先把土地深翻一遍再下种。
  • The soldiers have been thoroughly instructed in the care of their weapons.士兵们都系统地接受过保护武器的训练。
TAG标签: child genetic DNA
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