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Background <p>In South America, <i>Babesia vogeli</i> is the primary causative agent of canine babesiosis, and brown dog ticks (<i>Rhipicephalus sanguineus</i> sensu lato) are the vectors. The recent separation of brown dog ticks into <i>Rhipicephalus sanguineus</i> sensu stricto (“temperate lineage”) and <i>Rhipicephalus linnaei</i> (“tropical lineage”) raised suspicions of the possibility of two distinct <i>Babesia</i> genotypes or even species being transmitted by these tick species.</p> Methods <p>To investigate this hypothesis, dog blood samples from Brazil (eight states), Paraguay, and Uruguay were collected to determine the genetic diversity of <i>B. vogeli</i> in South America. The samples were collected from temperate regions (southern Brazil and Uruguay), where the putative&#xa0;vector is <i>R. sanguineus</i>, and from the tropical areas (southeastern, midwestern, northeastern, and northern Brazil and Paraguay), where <i>R. linnaei</i> is the vector. DNA samples from <i>B. vogeli</i>-positive dogs were extracted to amplify the 18S ribosomal RNA, internal transcribed spacers 1 and 2, heat shock protein 70, cytochrome c oxidase subunit 1, cytochrome oxidase c subunit 3, and cytochrome b genes. The sequences obtained were aligned with available <i>B. vogeli</i> sequences in GenBank and other homologous sequences to construct phylogenetic trees, haplotype networks, and matrices.</p> Results <p>Our haplotypic and phylogenetic analyses congruently indicated the existence of one genotype in temperate areas and another in tropical areas, where <i>R. sanguineus</i> and <i>R. linnaei</i> act as vectors, respectively. While the percentage of similarity varied among the evaluated genetic markers, the results indicated a clear differentiation between the <i>B. vogeli</i> genotypes associated with temperate and tropical regions.</p> Conclusions <p>Our data indicate the existence of two <i>B. vogeli</i> genotypes in South America, associated with temperate and tropical areas. This contributes to a better understanding of <i>B. vogeli’s</i> genetic diversity and opens new avenues for researching the ecology and coevolution of <i>B. vogeli</i> genotypes and their tick vectors. Owing to their correlation with the climatic region and the historical nomenclature of their vectors, we suggest the nomenclature of “temperate” and “tropical” <i>B. vogeli</i> genotypes.</p> Graphical Abstract <p></p>

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Are Babesia vogeli genotypes associated with Rhipicephalus sanguineus and Rhipicephalus linnaei distribution?

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月13日

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  • Vinícius Baggio-Souza,
  • Laura Berger,
  • Rafaela Mallmann-Bohn,
  • Adeyldes Oliveira Reis,
  • Lay Greco Basilio,
  • Yasmin Santanna Pereira,
  • Luiza Tirelli,
  • Renata Fagundes-Moreira,
  • João Vitor dos Santos Alves da Silva,
  • Lorena Freitas das Neves,
  • Ludmila Rodrigues Moroz,
  • Huarrisson Azevedo Santos,
  • Maria E. Marecos Espinoza,
  • Cíntia Daudt,
  • Fabio Gregori,
  • Aline Giroto-Soares,
  • Flávio Roberto Chaves da Silva,
  • João Luis Garcia,
  • Daniel Moura de Aguiar,
  • Maristela Peckle Peixoto,
  • José Manuel Venzal,
  • Filipe Dantas-Torres,
  • Marcos Rogério André,
  • João Fabio Soares

摘要

Background

In South America, Babesia vogeli is the primary causative agent of canine babesiosis, and brown dog ticks (Rhipicephalus sanguineus sensu lato) are the vectors. The recent separation of brown dog ticks into Rhipicephalus sanguineus sensu stricto (“temperate lineage”) and Rhipicephalus linnaei (“tropical lineage”) raised suspicions of the possibility of two distinct Babesia genotypes or even species being transmitted by these tick species.

Methods

To investigate this hypothesis, dog blood samples from Brazil (eight states), Paraguay, and Uruguay were collected to determine the genetic diversity of B. vogeli in South America. The samples were collected from temperate regions (southern Brazil and Uruguay), where the putative vector is R. sanguineus, and from the tropical areas (southeastern, midwestern, northeastern, and northern Brazil and Paraguay), where R. linnaei is the vector. DNA samples from B. vogeli-positive dogs were extracted to amplify the 18S ribosomal RNA, internal transcribed spacers 1 and 2, heat shock protein 70, cytochrome c oxidase subunit 1, cytochrome oxidase c subunit 3, and cytochrome b genes. The sequences obtained were aligned with available B. vogeli sequences in GenBank and other homologous sequences to construct phylogenetic trees, haplotype networks, and matrices.

Results

Our haplotypic and phylogenetic analyses congruently indicated the existence of one genotype in temperate areas and another in tropical areas, where R. sanguineus and R. linnaei act as vectors, respectively. While the percentage of similarity varied among the evaluated genetic markers, the results indicated a clear differentiation between the B. vogeli genotypes associated with temperate and tropical regions.

Conclusions

Our data indicate the existence of two B. vogeli genotypes in South America, associated with temperate and tropical areas. This contributes to a better understanding of B. vogeli’s genetic diversity and opens new avenues for researching the ecology and coevolution of B. vogeli genotypes and their tick vectors. Owing to their correlation with the climatic region and the historical nomenclature of their vectors, we suggest the nomenclature of “temperate” and “tropical” B. vogeli genotypes.

Graphical Abstract