首页
登录
职称英语
Scientists have discovered strands of genetic code linked to short sight, th
Scientists have discovered strands of genetic code linked to short sight, th
游客
2024-05-16
4
管理
问题
Scientists have discovered strands of genetic code linked to short sight, the most common eye disorder in the world. The findings shed light on what goes awry (出错的) to make distant objects look blurred, and raises the prospect of developing drugs to prevent the condition. Understanding the biological glitches (故障) behind short-sightedness could help researchers develop eye drops or tablets that could be given to children to stop their vision from failing as they get older.
Short-sightedness usually starts to manifest early on in life. The extent to which genes are to blame varies, but for those with the worst vision, around 80% of the condition is caused by genetic factors.
Two separate studies, published in Nature Genetics journal, found variations in DNA that were more common in people with short sight. Chris Hammond, at King’s College, London, found one section of DNA on chromosome 15 was more common in people with short sight. Caroline Klaver, at Erasmus Medical Centre in Rotterdam, found another strand, also on chromosome 15, linked to short sight.
The variations in DNA amount to misspellings in the genetic code. These alter the activity of three genes that control the growth of the eyeball and ensure light entering the eye is converted into electrical pulses in the retina (视网膜). The discovery helps scientists piece together how a healthy eye becomes short-sighted and points the way to medicines to prevent it in children.
"My hope is that we can identify a pathway that we can block with eyedrops or tablets that will stop the eye growing too much and without interfering with normal brain development or other processes in the body," Hammond told the Guardian.
Treating short sight in adults is a much tougher job, as their eyeballs have already grown too long.
Children who inherit genes for short sight are not destined to have poor vision. In 2008, Kathryn Rose at the University of Sydney looked at rates of short-sightedness in Chinese schoolchildren living in Singapore and Sydney. Some 29% living in Singapore had short sight, compared with only 3% in Sydney. One possible explanation is that those living in Sydney spent more time outdoors, and so got more natural sunlight and were used to focusing on more distant objects.
Some eye conditions are already being treated by replacing the faulty genes that cause them, but Hammond and Klaver said that too many genes contribute to short sight to make it a realistic option. [br] The fact that adults’ eyeballs have grown for too many years made it a harder job to______.
选项
答案
treat their short sight
解析
细节辨认题。本题主要考查成年人近视更难治疗的原因。文章第六段中指出,治疗成年人近视是一份更加棘手的工作,因为他们的眼球已经发育很久了。
转载请注明原文地址:https://tihaiku.com/zcyy/3601346.html
相关试题推荐
[originaltext]Scientiststhinkitwillbepossibletorecordpeople’sdream
[originaltext]Scientiststhinkitwillbepossibletorecordpeople’sdream
Scientistshavediscoveredstrandsofgeneticcodelinkedtoshortsight,th
Scientistshavediscoveredstrandsofgeneticcodelinkedtoshortsight,th
Scientistshavediscoveredstrandsofgeneticcodelinkedtoshortsight,th
[originaltext]Astronomershavediscoveredapotentiallyhabitableplanetofsim
Australia,thelast【B1】______tobe"discovered",wassightedbyDutch,Portu
Australia,thelast【B1】______tobe"discovered",wassightedbyDutch,Portu
Australia,thelast【B1】______tobe"discovered",wassightedbyDutch,Portu
Australia,thelast【B1】______tobe"discovered",wassightedbyDutch,Portu
随机试题
Forthispart.youareallowedthirtyminutestowriteAnApplicationLetter.Yo
[originaltext]Ihavebeenteachingforalongtime,andindoingsoIhave
位图与矢量图相比,位图( )。A.占用空间较大,处理侧重于获取和复制,显示速度
根据《辅助设施检修策略》,防雷装置异常,应进行检查,必要时更换防雷装置。
5、变更接线或试验结束时,应首先_______试验电源、放电,并将升压
老洪一家居住在甲市乙街道一间20平方米的一居室,家庭户籍所在地为丙市丁街道。户主
在某大学生创业大赛现场,5名女孩准备筹集40万元资金,到武汉近郊去承包50亩地,
银行期末按被投资单位实现的净利润计算应分享的金额。其会计分录为( )。A.借:损
公共物品一旦被提供,增加一个人的消费并不增加任何额外成本,这体现了公共物品的(
【背景资料】 某施工单位承包建设矿井的井筒项目。业主仅以相邻矿井的地质资料绘制
最新回复
(
0
)