肝动物物种的形态和分子特征感染青和蛇遍布美国中部和东部
The Journal of parasitology
|October 20, 2025
概括
青和蛇中的肝类寄生虫很难仅仅通过形态学来识别. 这项研究表明,基因测序对于区分物种至关重要,特别是在混合感染中,并表明蛇从猎物中获取寄生虫.
科学领域:
- 寄生虫学的寄生虫学
- 分子生物学分子生物学
- 类学 类学 类学
背景情况:
- 肝类包括载体传播的血寄生虫,感染各种脊椎动物.
- 区分Hepatozoon物种是具有挑战性的,因为血流形式的形态特征有限.
- 以前对宿主红细胞病理和载体阶段的依赖越来越多地与分子数据相矛盾.
研究的目的:
- 为了调查Hepatozoon物种感染青和蛇在美国东部中部.
- 为了将肝动物感染与宿主红细胞的形态特征与遗传数据相关联.
- 为了澄清物种识别挑战,特别是对于Hepatozoon catesbianae和Hepatozoon clamatae.
主要方法:
- 在青和蛇中抽取Hepatozoon寄生虫的样本.
- 使用显微镜对肝炎动物感染的形态表征.
- 通过三个遗传位点 (COIII,ITS-1,18SrDNA) 的桑格测序来进行分子表征.
主要成果:
- 三种类青被Hepatozoon感染;只有Rana clamitans表现出红细胞核碎片化.
- 混合的肝动物感染很常见,这使得基于形态的物种鉴定变得复杂.
- 遗传学分析显示,青的肝类动物形成了一个单一的类,而蛇的分离物是多种的,这表明宿主-病原体捕获事件.
结论:
- 像红细胞核碎片化的形态特征是不可靠的差异化近亲的Hepatozoon物种在anurans.
- 基因测序对于准确的肝动物物种识别至关重要,特别是在混合感染中.
- 蛇很可能从猎物中获取Hepatozoon,这表明复杂的宿主交换和对寄生虫进化的影响.
相关概念视频
00:53Migration
8.1K
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
8.1K
02:39Predator-Prey Interactions
17.2K
Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
17.2K
02:18Types of Genetic Transfer Between Organisms
24.8K
Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.
24.8K
01:30Bacterial Phylum Spirochaetes
1.5K
Spirochetes, unique bacteria in the phylum Spirochaetes, are gram-negative, motile, tightly coiled, slender, and flexible. They inhabit aquatic sediments and animals, with some causing diseases like syphilis. Spirochetes are classified into eight genera based on habitat, pathogenicity, phylogeny, and characteristics.Their distinctive motility arises from endoflagella, located within the cell’s periplasm. These endoflagella anchor at the cell poles and extend along the cell length, encased...
1.5K
01:25Arboviral Encephalitis
70
Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
70
01:25Hepatitis
99
Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver.
99