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
35
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] It is an unrealistic option to treat people with short sight by a replacement for the faulty genes that____
选项
答案
cause short sight
解析
细节辨认题。本题主要考查通过更换导致疾病的缺陷基因来治疗近视是否可行。Hammond和Klaver认为,因为太多基因导致近视,所以这个方法对治疗近视来说不是一个可行的选择。
转载请注明原文地址:https://tihaiku.com/zcyy/3601348.html
相关试题推荐
HardlyhadMagellandiscoveredthestrait______(他便以自己的名字为其命名了).whenhenamedit
Researchershavediscoveredthatspendingafewminutesthinkingaboutyour
Researchershavediscoveredthatspendingafewminutesthinkingaboutyour
[originaltext]Scientiststhinkitwillbepossibletorecordpeople’sdream
Scientistshavediscoveredstrandsofgeneticcodelinkedtoshortsight,th
[originaltext]Astronomershavediscoveredapotentiallyhabitableplanetofsim
[originaltext]Astronomershavediscoveredapotentiallyhabitableplanetofsim
[originaltext]Astronomershavediscoveredapotentiallyhabitableplanetofsim
Australia,thelast【B1】______tobe"discovered",wassightedbyDutch,Portu
Australia,thelast【B1】______tobe"discovered",wassightedbyDutch,Portu
随机试题
[originaltext]M:Hi,Kate.AreyoucomingfordinneronWednesdaynight?It’sm
Ithoughthavingababywouldhurtmywritingcareer.Iwaswrong.
Besides"American"characteristics-individualism,self-reliance,informality,
[originaltext]M:Hi,wouldyoulikesomehelp?W:Well,I’mlookingforsomethi
关于支气管扩张常见临床特点的叙述错误的是()。A.反复咯血 B.病变部位固
在滤波器电路中,电容C对高频分量有抑制作用。()
A.4/3πab B. C. D.
促进创业投资发展的相关政策措施有( )。 Ⅰ大力培育和发展合格投资者 Ⅱ完
患者男性,40岁,因违反工作程序被电击伤,判断为心脏骤停,进行现场抢救时应A.触
把下面的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项是
最新回复
(
0
)