英语新闻 英语考试 留学英语 TEM英语 CET英语 BEC英语 托福英语 雅思英语 英语作文 英语故事 英语笑话 娱乐英语 行业英语 英语学习 生活英语
工作英语 奥运英语 法律英语 英语口语 英文阅读 写作翻译 词汇语法 专四八级 四级六级 考研英语 职称英语 疯狂英语 英文简历 奥运知识 名人演说
您现在的位置: 3edu教育网 >> 英语角 >> 英语新闻 >> 科技Science >> 正文    3edu教育网,百万资源,完全免费,无需注册,天天更新!

螺旋孢子虫是由绿藻进化而来

螺旋孢子虫是由绿藻进化而来

分类:科技Science   更新:2014/5/13   来源:网络

螺旋孢子虫是由绿藻进化而来

"Malaria drastically reduced its genome and became very dependent on its host for nutrients. Helicosporidium, on the other hand, lost almost nothing except those genes required for photosynthesis(光合作用), which it no longer needs as a parasite.
    螺旋孢子虫是由绿藻进化而来
    A genomic investigation by University of British Columbia researchers has revealed that a lethal parasite infecting a wide range of insects actually originated from pond scum(绿藻类层), but has completely shed its green past on its evolutionary journey. A team led by UBC Botany Prof. Patrick Keeling sequenced the genome of Helicosporidium -- an intracellular parasite that can kill juvenile blackflies, caterpillars(毛毛虫), beetles and mosquitoes -- and found it evolved from algae like another notorious pathogen: malaria(疟疾).
    Keeling and colleagues had previously reported that malaria shared a common evolutionary lineage with the algae responsible for toxic red tides. Their latest study, published in the online journal PLOS Genetics, shows that Helicosporidium evolved from green alga but, unlike malaria, preserved virtually all its genes except those required for photosynthesis.
    "Both malaria and Helicosporidium started out as alga and ended up as intracellular parasites preying on animals, but they have done it in very different ways," says Keeling, director of the Centre for Microbial Diversity and Evolution at UBC and a Senior Fellow of Canadian Institute for Advanced Research.
    "Malaria drastically reduced its genome and became very dependent on its host for nutrients. Helicosporidium, on the other hand, lost almost nothing except those genes required for photosynthesis(光合作用), which it no longer needs as a parasite.
    "It's as if photosynthesis has been surgically removed from its genome."
    The discovery, done in collaboration with scientists at the Universities of Rhode Island and Florida, will allow researchers to compare how parasites evolve at the molecular level in these two distantly related lineages. It also provides the first insights into their origins, development as well as methods of infection, which are key to controlling the population of pest-insect hosts.

| 设为首页 | 加入收藏 | 联系我们 | 版权申明 | 隐私策略 | 关于我们 | 手机3edu | 返回顶部 |