Department of Parasitology, Faculty of Science, Charles University, 128 44 Prague, Czech Republic.
Protist. 2012 Jul;163(4):616-31. doi: 10.1016/j.protis.2011.12.004. Epub 2012 Feb 16.
A trypanosomatid species, designated as Typing Unit 1 (TU1) by sequences of SL RNA gene repeats, has been found in the intestine of pyrrhocorids (Insecta: Heteroptera) in Europe, Mediterranean, Central America and some parts of Asia and Africa. Phylogenetic analysis of the SL repeat sequences has shown that the isolates group in the tree according to their geographic origin. The maximal sequence divergence was observed in parasites from Neotropics suggesting the origin within and subsequent migrations from this region. The global distribution of the parasite could have been facilitated by ubiquity of its hosts that include several genera of the family Pyrrhocoridae. In Europe the TU1 flagellates frequently occur in Pyrrhocoris apterus, the host of Leptomonas pyrrhocorisZotta, 1912, a species that had been insufficiently defined by host and light microscopy level morphology. Herein, the Zotta's species description has been amended to include the TU1 SL RNA repeat, SSU rRNA, glycosomal GAPDH gene sequences, as well as ultrastructure. In addition, Leptomonas scantii n. sp. with an overlapping host range has been described. Moreover, 10 typing units of trypanosomatids found in the pyrrhocorid hosts demonstrate the extent of variability of trypanosomatids occurring in one host family.
一种锥虫生物种，根据 SL RNA 基因重复序列被命名为 TU1，已在欧洲、地中海、中美洲以及亚洲和非洲的一些地区的 Pyrrhocorids（昆虫纲：异翅目）肠道中被发现。SL 重复序列的系统发育分析表明，根据其地理起源，分离株在树中分组。在来自新热带地区的寄生虫中观察到最大的序列差异，表明该寄生虫起源于该地区，并随后从该地区迁徙。由于其宿主包括 Pyrrhocoridae 家族的几个属，因此该寄生虫的全球分布可能得到了其宿主的广泛分布的促进。在欧洲，TU1 鞭毛虫经常出现在 Pyrrhocoris apterus 中，Leptomonas pyrrhocorisZotta, 1912 的宿主，后者的形态特征在宿主和光镜水平上定义不足。本文对 Zotta 的物种描述进行了修订，包括 TU1 SL RNA 重复序列、SSU rRNA、糖体 GAPDH 基因序列以及超微结构。此外，还描述了具有重叠宿主范围的 Leptomonas scantii n. sp。此外，在 Pyrrhocorid 宿主中发现的 10 种锥虫生物种表明了在一个宿主家族中发生的锥虫生物种的变异程度。
