首页> 外文期刊>Nature >Mechanism of genetic exchange in American trypanosomes
【24h】

Mechanism of genetic exchange in American trypanosomes

机译:美国锥虫的基因交换机制

获取原文
获取原文并翻译 | 示例
           

摘要

The kinetoplastid Protozoa are responsible for devastating diseases(1). In the Americas, Trypanosoma cruzi is the agent of Chagas' disease-a widespread disease transmissible from animals to humans (zoonosis)-which is transmitted by exposure to infected faeces of blood-sucking triatomine bugs(2). The presence of genetic exchange in T. cruzi and in Leishmania is much debated(3,4). Here, by producing hybrid clones, we show that T. cruzi has an extant capacity for genetic exchange. The mechanism is unusual and distinct from that proposed for the African trypanosome, Trypanosoma brucei(5). Two biological clones(6) of T. cruzi were transfected to carry different drug-resistance markers(7,8), and were passaged together through the entire life cycle. Six double-drug-resistant progeny clones, recovered from the mammalian stage of the life cycle, show fusion of parental genotypes, loss of alleles, homologous recombination, and uniparental inheritance of kinetoplast maxicircle DNA. There are strong genetic parallels between these experimental hybrids and the genotypes among natural isolates of T. cruzi. In this instance, aneuploidy through nuclear hybridization results in recombination across far greater genetic distances than mendelian genetic exchange. This mechanism also parallels genome duplication(9,10). [References: 30]
机译:动质体原生动物是造成毁灭性疾病的原因(1)。在美洲,克鲁斯锥虫是恰加斯氏病的病原体,查加斯氏病是一种从动物传播给人类的广泛疾病(人畜共患病),是通过接触感染了吸血三聚体臭虫的粪便而传播的(2)。 T. cruzi和利什曼原虫中基因交换的存在备受争议(3,4)。在这里,通过产生杂种克隆,我们显示出克鲁氏锥虫具有现存的遗传交换能力。该机制是不寻常的,与非洲锥虫锥虫锥虫(Trypanosoma brucei)提出的机制不同(5)。转染了克氏锥虫的两个生物学克隆(6),以携带不同的抗药性标记(7,8),并在整个生命周期中一起传代。从生命周期的哺乳动物阶段恢复的六个双重抗药性子代克隆显示出亲本基因型融合,等位基因缺失,同源重组以及动植物体大环DNA的单亲遗传。在这些实验性杂种与天然克鲁维酵母分离株之间的基因型之间有很强的遗传相似性。在这种情况下,通过核杂交产生的非整倍性导致重组的跨度远大于孟德尔遗传交换。这种机制也平行于基因组复制(9,10)。 [参考:30]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号