Characterization of SSU and LSU rRNA genes of three Trypanosoma (Herpetosoma) grosi isolates maintained in Mongolian jirds

Characterization of SSU and LSU rRNA genes of three Trypanosoma (Herpetosoma) grosi isolates maintained in Mongolian jirds
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DOI:
10.1017/s0031182004006493
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发表时间:
2004-10
期刊:
影响因子:
2.4
通讯作者:
Hiroshi Sato;A. Osanai;H. Kamiya;Y. Obara;W. Jiang;Q. Zhen;J. Chai;Yumi Une;Mamoru Ito
Hiroshi Sato;A. Osanai;H. Kamiya;Y. Obara;W. Jiang;Q. Zhen;J. Chai;Yumi Une;Mamoru Ito
中科院分区:
医学2区
文献类型:
--
作者:
Hiroshi Sato;A. Osanai;H. Kamiya;Y. Obara;W. Jiang;Q. Zhen;J. Chai;Yumi Une;Mamoru Ito

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大锥虫(Herpetosoma)grosi 天然寄生于姬鼠属(Apododemus spp.),在实验中可以感染蒙古沙鼠(Meriones unguiculatus)。来自不同地理来源(AKHA 来自日本,其他来自符拉迪沃斯托克)的三种黑线鼠、半岛沙鼠和大花沙鼠(分别命名为 SESUJI、HANTO 和 AKHA 分离物)在实验室沙鼠中表现出不同的寄生虫血症持续时间(HANTO 为 2 周,其他为 3 周)。为了评估这些 T.grosi 分离株的遗传背景,我们对它们的小亚基 (SSU) 和大亚基 (LSU) 核糖体 RNA 基因 (rDNA) 以及其他 2 个来自松鼠的疱疹病毒物种的核糖体 RNA 基因 (rDNA) 进行了测序。这 3 个物种的 SSU rDNA 序列以及其他 3 种疱疹锥虫(T. lewisi、T. musculi 和 T. microti)的可用序列似乎很好地反映了其宿主的系统发育关系。 T.grosi 的 3 个分离株在 2019 个碱基的 18S rDNA 的 2-6 个位置、1817/1818 个碱基的 28Sα rDNA 的 5-29 个位置或 1557-1559 个碱基的 28Sβ rDNA 的 1-5 个位置处表现出碱基变化,并且没有一个通过 rDNA 核苷酸序列与其他 2 个分离株分离。由于锥虫在种间和种内水平上的碱基变化可能频繁发生在特定的rDNA区域,因此对啮齿动物锥虫这些区域的分子分析可以帮助物种/品系的分化和系统修正锥虫物种,其数量肯定比目前已知的更为丰富。
Trypanosoma (Herpetosoma) grosi, which naturally parasitizes Apodemus spp., can experimentally infect Mongolian jirds (Meriones unguiculatus). Three isolates from A. agrarius, A. peninsulae, and A. speciosus (named SESUJI, HANTO, and AKHA isolates, respectively) of different geographical origin (AKHA from Japan, and the others from Vladivostok), exhibited different durations of parasitaemia in laboratory jirds (2 weeks for HANTO, and 3 weeks for the others). To assess the genetic background of these T. grosi isolates, their small (SSU) and large subunit (LSU) ribosomal RNA genes (rDNA) were sequenced along with those of 2 other Herpetosoma species from squirrels. The SSU rDNA sequences of these 3 species along with available sequences of 3 other Herpetosoma trypanosomes (T. lewisi, T. musculi and T. microti) seemed to reflect well the phylogenetic relationship of their hosts. Three isolates of T. grosi exhibited base changes at 2–6 positions of 2019-base 18S rDNA, at 5–29 positions of 1817/1818-base 28Sα rDNA, or 1–5 positions of 1557–1559-base 28Sβ rDNA, and none was separated from the other 2 isolates by rDNA nucleotide sequences. Since base changes of Herpetosoma trypanosomes at the level of inter- and intra-species might occur frequently in specified rDNA regions, the molecular analysis on these regions of rodent trypanosomes could help species/strain differentiation and systematic revision of Herpetosoma trypanosome species, which must be more abundant than presently known.