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
2023-08-28
49
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/2966319.html
相关试题推荐
【B1】[br]【B18】A、associatedB、linkedC、relatedD、involvedD固定搭配。A与with搭配,B、C都与to
Whensocialscientistsusethetermculturetheytendtobetalkingabouta
Whensocialscientistsusethetermculturetheytendtobetalkingabouta
Whensocialscientistsusethetermculturetheytendtobetalkingabouta
[originaltext]Onewaythatscientistslearnaboutmanisbyanimals,sucha
[originaltext]Onewaythatscientistslearnaboutmanisbyanimals,sucha
[originaltext]Onewaythatscientistslearnaboutmanisbyanimals,sucha
Amusselgripsahardsurfaceveryfirmlyto______.[br]Scientistsarenotthi
Before1965manyscientistspicturedthecirculationoftheocean’swaterm
Before1965manyscientistspicturedthecirculationoftheocean’swaterm
随机试题
Theaimoftheagreementisto______.[br][originaltext]TheCanadianpolicesa
Whenshopkeeperswanttolurecustomersintobuyingaparticularproduct,th
AnewstudyfromtheUniversityofNewSouthWaleshasdiscoveredthatdurin
希望工程(ProjectHope)是于1989年发起的一项公益事业,以救助贫困地区失学儿童(youngdropouts)为目的。帮助建设希望小学与资
ACD
A.冷苯中的溶解度不同B.乙醚中的溶解度不同C.水中的溶解度不同D.草酸盐溶解度
当在建建筑物抵押价值包含土地使用权的价值时,该土地使用权必须是有偿获得,并领有国
图1为某市域城镇体系规划。M为中心城市,C为以煤炭、大宗散货为主的港口(5~10
对下丘脑促性腺激素释放激素的正确叙述是 A.属于肽类激素B.神经冲动
(2019年真题)根据《标准施工招标文件》,关于施工合同变更权和变更程序的说法,
最新回复
(
0
)