首页
登录
职称英语
Scientists have cured color blindness in monkeys using gene therapy. As
Scientists have cured color blindness in monkeys using gene therapy. As
游客
2023-10-12
31
管理
问题
Scientists have cured color blindness in monkeys using gene therapy.
As well as allowing color-blind humans to tell red from green, the innovative technique could restore sight to the blind.
Sufferers of age-related macular degeneration—the most common cause of blindness in the elderly—are among the millions who could eventually benefit.
Researcher Jay Neitz said: " If we could find a way to do this with complete safety in human eyes, as we did with monkeys, there would be a lot of people who would want it. We hope the technology will be useful in correcting a lot of different vision disorders.
Professor Neitz used gene therapy—injections of genes—to allow two male squirrel monkeys called Sam and Dalton to see in full color for the first time.
Like some humans with red-green colour blindness, the monkeys lacked a pigment that the cones—the colour—detector cells at the back of the eye—need to see red and green. As a result, they saw both red and green as shades of grey. Other colours, such as orange, blue and brown appeared washed-out.
To correct their vision, the US scientists injected the monkey’s eyes with millions of copies of a gene needed to make the missing pigment, the journal Nature reports.
Importantly, the monkeys were injected with a human gene, suggesting the same technique would work on people. Four months later, their vision suddenly improved.
Professor Neitz, of the University of Washington in Seattle, said; "it was as if they woke up and saw these new colours. They unquestionably responded to colours that had been invisible to them. "A version of the colour blindness test that is used in schools around the world showed just how much their vision has improved.
Dr Katherine Mancuso, the study’s lead author, said: "Their performance on red and green was similar, but not quite as good, us a female monkey who had normal colour vision since birth.
The need to prove that adding genes to the body does not cause harmful side-effects means it will be some time before the method is routinely used to correct colour blindness in humans. Despite this, the researchers are optimistic and point out that gene therapy is already being tested on Britons and Americans with a rare, hereditary form of blindness called Leber’s congenital amaurosis.
The technique could also be adapted to treat other conditions that involve problems with genes in the colour and detail-detecting cone cells at the back of the eye. These include age-related macular degeneration, in which the deterioration of central vision makes it increasingly difficult to carry out everyday tasks such as reading and driving. Blindness linked to diabetes might also be treated.
Cathy Yelf, of the Macular Disease Society, said the research was "very interesting" but cautioned; "A practical gene therapy for macular degeneration is still some way off. [br] What does "cones" refer to in this report?
选项
答案
The color-detector cells at the back of the eye.
解析
(第六段第一句提到:猴子缺少一种色素,即人眼中具有的cones“圆锥细胞”,破折号后面对圆锥细胞作出了解释:它是处于眼睛后部的用于探测颜色的细胞。)
转载请注明原文地址:https://tihaiku.com/zcyy/3092226.html
相关试题推荐
Scientistshavecuredcolorblindnessinmonkeysusinggenetherapy.As
Scientistshavecuredcolorblindnessinmonkeysusinggenetherapy.As
Scientistshavecuredcolorblindnessinmonkeysusinggenetherapy.As
Scientistshavecuredcolorblindnessinmonkeysusinggenetherapy.As
Scientistshaveidentifiedthelikelyculpritinadiseasethathasdevastat
Scientistshaveidentifiedthelikelyculpritinadiseasethathasdevastat
Scientistshaveidentifiedthelikelyculpritinadiseasethathasdevastat
Ateamofscientistshasjustfinishedwhatmightliterallybedescribedas
Ateamofscientistshasjustfinishedwhatmightliterallybedescribedas
"Throwitaway?Thereisnoway,"scientistswarnusso.Whatthatmeans,of
随机试题
SuggestopediaIntroduction•basis:how【T1】_______
Duringthewholelife,Jefferson______.[br]Whydouniversitiesusuallyuseth
详细可行性研究中通常使用的固定资产投资估算方法是()。A.单位生产能力投资系数法
举例说明幼儿自我评价发展的趋势和主要特点。
患者,男性,24岁。结核病,医嘱链霉素治疗,链霉素皮试发生过敏性休克而出现中枢神
附子不良反应的特点是A.不严重 B.与配伍、炮制无关 C.可出现瞳孔散
A.12 B.10 C.8 D.4
施工企业生产经营中发生的管理费用和财务费用属于( )。A.工程成本 B.制造
稳心颗粒的主治病证是A.血瘀所致的眩晕 B.瘀血阻络所致的中风 C.气阴两虚
水利工程的质量缺陷备案表应由()组织填写。A、质量监督单位 B、监理单位 C
最新回复
(
0
)