Phylogenetic diversity of two common Trypanosoma cruzi lineages in the Southwestern United States

Phylogenetic diversity of two common Trypanosoma cruzi lineages in the Southwestern United States
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美国西南部两个常见克氏锥虫谱系的系统发育多样性

DOI:
10.1016/j.meegid.2022.105251
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发表时间:
2022
期刊:
Genetics and Evolution
影响因子:
--
通讯作者:
Machado, Carlos A.
Machado, Carlos A.
中科院分区:
--
文献类型:
--
作者:
Flores-López, Carlos A.;Mitchell, Elizabeth A.;Reisenman, Carolina E.;Sarkar, Sahotra;Williamson, Philip C.;Machado, Carlos A.

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克氏锥虫是南美锥虫病的病原体,南美锥虫病是一种毁灭性的寄生虫病,流行于中美洲和南美洲、墨西哥和美国。本文报道了在5种锥蝽(Triatoma gerstaeckeri,T. lecticularia、T.indictiva、T. sanguissuga和T. recurva),使用具有四个单拷贝基因座(细胞色素氧化酶亚基II-NADH脱氢酶亚基1区(COII-ND 1)、错配修复类2(MSH 2)、二氢叶酸还原酶-胸苷酸合酶(DHFR-TS)和具有ID TcCLB.506529.310的核基因)的多基因座序列分型(MLST)。AllT. cruzivariants属于两个主要的遗传谱系:75%的样品对应于T。cruziDiscrete Typing Unit(DTU)I(TcI)和25%至先前标记为TcIV-USA的北美特异性谱系。我们的新数据的系统发育和序列分歧分析加上所有以前发表的序列数据,从这四个位点在美国收集,表明TcIV-USA是显着不同的任何其他先前定义的T。cruziDTUs。TcIV-USA与其它T. cruziDTU的研究应使人们更加重视了解这种DTU的流行病学重要性及其在人类和家畜中的地理范围和致病性。我们的研究结果进一步证实了这样一个事实,即有一个高的遗传多样性的寄生虫在北美,并强调需要适当的监测和媒介控制计划,南美锥虫病在美国南部和墨西哥。
Trypanosoma cruziis the causative agent of Chagas disease, a devastating parasitic disease endemic to Central and South America, Mexico, and the USA. We characterized the genetic diversity ofTrypanosoma cruzicirculating in five triatomine species (Triatoma gerstaeckeri,T. lecticularia,T.indictiva,T. sanguisugaandT. recurva) collected in Texas and Southern Arizona using multilocus sequence typing (MLST) with four single-copy loci (cytochrome oxidase subunit II- NADH dehydrogensase subunit 1 region (COII-ND1), mismatch-repair class 2 (MSH2), dihydrofolate reductase-thymidylate synthase (DHFR-TS) and a nuclear gene with ID TcCLB.506529.310). AllT. cruzivariants fall in two main genetic lineages: 75% of the samples corresponded toT. cruziDiscrete Typing Unit (DTU) I (TcI), and 25% to a North American specific lineage previously labelled TcIV-USA. Phylogenetic and sequence divergence analyses of our new data plus all previously published sequence data from those four loci collected in the USA, show that TcIV-USA is significantly different from any other previously definedT. cruziDTUs. The significant level of genetic divergence between TcIV-USA and otherT. cruziDTUs should lead to an increased focus on understanding the epidemiological importance of this DTU, as well as its geographical range and pathogenicity in humans and domestic animals. Our findings further corroborate the fact that there is a high genetic diversity of the parasite in North America and emphasize the need for appropriate surveillance and vector control programs for Chagas disease in southern USA and Mexico.
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