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First report of mixed Trypanosoma cruzi discrete typing units infection in Triatoma phyllosoma in the peri-urban environment of Oaxaca, Mexico

ABSTRACT

Background:

Chagas disease, a zoonosis transmitted mainly by hematophagous insects of the subfamily Triatominae, is caused by Trypanosoma cruzi, classified into six discrete typing units (DTUs: TcI-TcVI and Tcbat).

Methods:

Insect vectors were collected from 84 human dwellings in the municipality of Santo Domingo Tehuantepec, Oaxaca, Mexico; 4.76% were infested. DTUs were determined using conventional and nested PCR.

Results:

The infection rate was 43.6%. All insects were infected with TcI while one specimen showed mixed infection with TcII.

Conclusions:

This is the first report of T. cruzi mixed infection in Triatoma phyllosoma, its main vector in the study region.

Keywords:
American trypanosomiasis; Triatomines; Discrete typing unit; Southeastern Mexico; Istmo de Tehuantepec

Chagas disease is a zoonotic disease caused by the parasite Trypanosoma cruzi, widely distributed throughout the Americas. According to the World Health Organization (WHO), it is listed as one of the most important vector-borne diseases (VBDs), which currently affects approximately six million people worldwide11. World Health Organization (WHO). Chagas disease [Internet]. 2023 [cited 2023 May 23]. Available from: Available from: https://www.who.int/news-room/fact-sheets/detail/chagas-disease-(american-trypanosomiasis)
https://www.who.int/news-room/fact-sheet...
. Owing to large genetic variation, Trypanosoma cruzi has been classified into six discrete typing units: TcI-TcVI and TcBat22. Zingales B, Bartholomeu DC. Trypanosoma cruzi genetic diversity: impact on transmission cycles and Chagas disease. Mem Inst Oswaldo Cruz. 2022, 117:e210193.. All DTUs are found throughout the Americas; TcI is the most prevalent in both wild and domestic cycles and strongly associated with cardiac involvement, while DTUs TcII, TcV, and TcVI are associated with cardiodigestive disorders33. Guhl F. Geographical distribution of Chagas Disease. In: Telleria J, Tibayrenc M, editors. American Trypanosomiasis Chagas Disease: One Hundred Years of Research. 2nd ed. Elsevier; 2017. 89-112 p..

Mexico is one of the countries most affected by Chagas disease, with a significantly increased number of cases in recent years, most of which are concentrated in the southeast region of the country44. Ibáñez-Cervantes G, León-García G, Castro-Escarpulli G, Mancilla-Ramírez J, Victoria-Acosta G, Cureño-Díaz MA, et al. Evolution of incidence and geographical distribution of Chagas disease in Mexico during a decade (2007-2016). Epidemiol Infect. 2019;147:1-7., where environmental and social conditions contribute to vector-borne transmission. In particular, the state of Oaxaca has among the highest morbidity and mortality rates for Chagas disease. Currently, 157 triatomine species have been recognized and described worldwide (154 living species and three fossil species). Brazil has the greatest biodiversity of triatomines (more than 60 species)55. Lent H, Wygodzinsky PW. Revision of the Triatominae (Hemiptera, Reduviidae), and their significance as vectors of Chagas’ disease. Bull Am Mus Nat Hist.1979; 163(3);123-520.,66. Costa J, Dale C, Galvão C, Almeida CE, Dujardin JP. Do the new triatomine species pose new challenges or strategies for monitoring Chagas disease? An overview from 1979-2021. Mem Inst Oswaldo Cruz. 2021;116:1-10., followed by Mexico (more than 30 species), of which 19 are epidemiologically relevant because their ability to invade and colonize human dwellings77. Ramsey JM, Peterson AT, Carmona-Castro O, Moo-Llanes DA, Nakazawa Y, Butrick M, et al. Atlas of Mexican Triatominae (Reduviidae: Hemiptera) and vector transmission of Chagas disease. Mem Inst Oswaldo Cruz 2015;110(3):339-52.. The following species have been documented in Oaxaca: T. phyllosoma, T. pallidipennis, T. mazzottii, T. barberi, and T. dimidiata88. Benitez Alva JI, Huerta H, Tellez Rendón JL. Distribución de triatominos (Heteroptera: Reduviidae) asociados a la vivienda humana y posibles zonas de riesgo en seis Estados de la República Mexicana. BIOCYT. 2012;5(17):327-40..

Triatoma phyllosoma is one of the main vectors of T. cruzi in the Istmo de Tehuantepec region where infection rates of 38-40% have been documented88. Benitez Alva JI, Huerta H, Tellez Rendón JL. Distribución de triatominos (Heteroptera: Reduviidae) asociados a la vivienda humana y posibles zonas de riesgo en seis Estados de la República Mexicana. BIOCYT. 2012;5(17):327-40.

9. Villalobos G, Martínez-Hernández F, De la Torre P, Laclette JP, Espinoza B. Entomological Indices, Feeding Sources, and Molecular Identification of Triatoma phyllosoma (Hemiptera: Reduviidae) One of the Main Vectors of Chagas Disease in the Istmo de Tehuantepec, Oaxaca, Mexico. Am J Trop Med Hyg. 2011;85(3):490-7.
-1010. Izeta-Alberdi A, Pech-May A, Tun-Ku E, Mazariegos-Hidalgo CJ, López-Cancino SA, Gutiérrez S, et al. Trypanosoma cruzi in Mexican Neotropical vectors and mammals: wildlife, livestock, pets, and human population. Salud Pública Mex. 2023;65(2)114-26.. Although TcI has been reported, very few studies have focused on identifying the circulating DTUs in this region1010. Izeta-Alberdi A, Pech-May A, Tun-Ku E, Mazariegos-Hidalgo CJ, López-Cancino SA, Gutiérrez S, et al. Trypanosoma cruzi in Mexican Neotropical vectors and mammals: wildlife, livestock, pets, and human population. Salud Pública Mex. 2023;65(2)114-26.. The objective of this study was to detect T. cruzi infection and to identify circulating DTUs in T. phyllosoma in the peri-urban domestic environment of the municipality of Santo Domingo Tehuantepec, Oaxaca, Mexico.

The study was conducted in the region of the Istmo of Tehuantepec in the Mexican state of Oaxaca, in the periphery (Lieza district) of the municipality of Santo Domingo Tehuantepec (16° 19' 41'' N, 95° 14' 42'' W) (Figure 1). This area is located 55 m above sea level. The vegetation is mainly low deciduous forest, the climate is warm sub-humid, with temperatures ranging from 20 to 30 °C, and the annual precipitation is between 700 and 1,000 mm. The corresponding local authorities were informed about the project objectives, and houses located on the outskirts of the Lieza district were selected. Triatomine sampling was conducted in March 2022 inside the dwellings (intra-domicile). In total, 84 households were visited, and triatomines were captured from four (4.76%). Collections were made by directly searching for cracked walls, beds, mattresses, furniture, concrete floors, and soil. Each specimen (adult and nymph) was individually placed in plastic jars lined with filter paper and labeled with the collection site information. The triatomines were then transferred to the “Laboratory of Molecular and Nutrigenomic Epidemiology, Emergent, Epidemic and Metabolic Diseases Group (EEEMA), Department of Health, El Colegio de la Frontera Sur (ECOSUR), San Cristobal,” where the sex and species were identified using the Lent and Wygodzinsky keys55. Lent H, Wygodzinsky PW. Revision of the Triatominae (Hemiptera, Reduviidae), and their significance as vectors of Chagas’ disease. Bull Am Mus Nat Hist.1979; 163(3);123-520..

FIGURE 1:
Location of Lieza district, Santo Domingo Tehuantepec, Oaxaca, Mexico.

The intestinal contents of each triatomine were extracted by abdominal incision and treated with DNA/RNA Shield™ (Zymo Research), according to the manufacturer’s instructions, vortexed vigorously, and stored at 4°C until processing. DNA was extracted using the Quick-DNA™ Miniprep Plus Kit (Zymo Research) according to the manufacturer’s instructions.

DNA amplification was performed using conventional polymerase chain reaction (cPCR) and nested PCR (nPCR) on three previously described and widely used gene regions of interest for identifying the T. cruzi DTUs (Table S1)1111. Rodrigues-dos-Santos Í, Melo MF, De Castro L, Hasslocher-Moreno AM, Do Brasil PEAA, Silvestre De Sousa A, et al. Exploring the parasite load and molecular diversity of Trypanosoma cruzi in patients with chronic Chagas disease from different regions of Brazil. PLoS Negl Trop Dis. 2018;12(11):1-19.: the intergenic region of the miniexon gene (SL-IR), the D7 domain region of the 24Sα ribosomal RNA gene, and the A10 nuclear fragment. For cPCR, primers TCC, TCI, and TCII were used to amplify 350 bp (TcI) or 300 bp (TcII, TcV, and TcVI) fragments of the SL-IR region. For nPCR, primers D75 and D76 (first round) and D76 and D71 (second round) were used to amplify 125 bp (TcIII), 140 bp (TcII and TcVI), 140 /145 bp (TcIV), and 125 or 125/140 bp (TcV) fragments of the D7 domain region. For the nuclear fragment region, A10 was amplified by nPCR using primers Pr1 and P6 (first round) and Pr1 and Pr3 (second round), which amplified fragments of 580 bp (TcII) and 525 bp (TcVI) (Figure S1). Reactions were set up with 12 µl of Thermo Scientific PCR Master Mix 2x, 1 µl of each primer, 30 ng of DNA (1 µl of nuclease-free water was used as a negative control), and nuclease-free water was added to complete a final volume of 25 µl. Amplification was performed on a Bio-Gener ELVE32G thermal cycler, and the PCR products were visualized under UV light on 2.0% agarose gels stained with GelRed (Biotium).

In total, 45 triatomines were caught in the dwellings, four (8.9%) fifth instar nymphs and 41 (91.1%) adults, of which 31 (75.6%) were female and 10 (24.4%) were male. All specimens were identified as T. phyllosoma. The intestinal contents of 39 triatomines were processed for detecting T. cruzi infection, as six had insufficient material for DNA extraction. Trypanosoma cruzi infection was detected in 17/39 (43.6%) triatomines, including 13/17 (76.5%) females and 4/17 (23.5%) males; no infection was detected in the collected nymphs (Table S2). Molecular typing of T. cruzi revealed that 16/17 (94.2%) of the positive samples were TcI, while 1/17 (5.8%) had mixed TcI-TcII infection as indicated by amplification of the miniexon intergenic region (SL-IR) (Figure 2). The DTUs of the mixed-infection samples corresponded to TcI and TcII, as shown in Figure 3.

FIGURE 2:
Visualization of conventional PCR amplification products for the miniexon gene from the intestinal contents of Triatoma phyllosoma collected from the Istmo of Tehuantepec, Oaxaca, Mexico, for identifying Trypanosoma cruzi. In 16 samples, 350 bp amplified fragments corresponding to TcI were observed, while in sample 26F, two fragments of 350 bp and 300 bp were observed, corresponding to a mixed infection with TcI-[TcII-TcVI (undetermined)]. L*: Ladder; PCTcI*: positive control TcI; PCTcII*: positive control TcII; NC: negative control; NL: not loaded.

FIGURE 3:
Visualization of the nested PCR amplification products of the D7 domain and the A10 nuclear region from the intestinal contents of sample 26F of Triatoma phyllosoma collected from the Istmo of Tehuantepec, Oaxaca, Mexico, for identifying Trypanosoma cruzi. a) Amplification of a 140 bp fragment of the 24Sα ribosomal RNA gene indicates the presence of TcII and TcVI DTUs. b) Amplification of a 580 bp fragment of the nuclear region confirms the presence of TcII. L*: ladder; NC*: negative control.

Currently, vector-borne T. cruzi is associated with habitat fragmentation and human activities such as deforestation and urbanization. These activities contribute to the dispersal of triatomines from a wild environment to a semi-urban or urban environment through attraction to light, search for food, and shelter. This behavior is more common in endemic regions and mainly affects households in urban peripheries and in precarious housing conditions99. Villalobos G, Martínez-Hernández F, De la Torre P, Laclette JP, Espinoza B. Entomological Indices, Feeding Sources, and Molecular Identification of Triatoma phyllosoma (Hemiptera: Reduviidae) One of the Main Vectors of Chagas Disease in the Istmo de Tehuantepec, Oaxaca, Mexico. Am J Trop Med Hyg. 2011;85(3):490-7..

Historically, the State of Oaxaca has been a relevant setting for studying Chagas disease in Mexico. In 1940, Dr. Luis Mazzotti documented the first cases of the acute disease in the community of Tejumulco, Oaxaca1212. Mazzotti L. Dos casos de enfermedad de Chagas en el estado de Oaxaca. Gac Med Mex. 1940;70:417-20.. From 2000-2016, high rates of chronic cases and disease-related mortality of 1.1-4.4 per 100,000 people were reported44. Ibáñez-Cervantes G, León-García G, Castro-Escarpulli G, Mancilla-Ramírez J, Victoria-Acosta G, Cureño-Díaz MA, et al. Evolution of incidence and geographical distribution of Chagas disease in Mexico during a decade (2007-2016). Epidemiol Infect. 2019;147:1-7.. Although the reasons for this are still largely unknown, the great diversity of triatomine species and the lack of effective vector control programs are considered to play key roles.

In our study, adult triatomines and fifth instar nymphs belonging to T. phyllosoma were found. This is consistent with previous studies that identified T. phyllosoma as the dominant species in the southeastern region of Oaxaca77. Ramsey JM, Peterson AT, Carmona-Castro O, Moo-Llanes DA, Nakazawa Y, Butrick M, et al. Atlas of Mexican Triatominae (Reduviidae: Hemiptera) and vector transmission of Chagas disease. Mem Inst Oswaldo Cruz 2015;110(3):339-52.,88. Benitez Alva JI, Huerta H, Tellez Rendón JL. Distribución de triatominos (Heteroptera: Reduviidae) asociados a la vivienda humana y posibles zonas de riesgo en seis Estados de la República Mexicana. BIOCYT. 2012;5(17):327-40.. Similarly, in a study carried out in the Istmo de Tehuantepec, T. phyllosoma was identified as the only species present in the area99. Villalobos G, Martínez-Hernández F, De la Torre P, Laclette JP, Espinoza B. Entomological Indices, Feeding Sources, and Molecular Identification of Triatoma phyllosoma (Hemiptera: Reduviidae) One of the Main Vectors of Chagas Disease in the Istmo de Tehuantepec, Oaxaca, Mexico. Am J Trop Med Hyg. 2011;85(3):490-7.. The rate of T. cruzi infection in our study was 43.6%, which was within the range (40-49%) reported in previous studies conducted in Oaxaca99. Villalobos G, Martínez-Hernández F, De la Torre P, Laclette JP, Espinoza B. Entomological Indices, Feeding Sources, and Molecular Identification of Triatoma phyllosoma (Hemiptera: Reduviidae) One of the Main Vectors of Chagas Disease in the Istmo de Tehuantepec, Oaxaca, Mexico. Am J Trop Med Hyg. 2011;85(3):490-7.,1313. Fernández-Santos NA, Trujillo-García JC, Hamer SA, Wei L, Martínez-Montoya H, Tamez-Guerra P, et al. Domestic Triatoma spp. Infections with Trypanosoma cruzi, Household Infestations, and Molecular Identification in Oaxaca, México. Insects. 2022;13(12):1-11.; however, it is slightly higher than that in a previous report from the Istmo de Tehuantepec (39%)99. Villalobos G, Martínez-Hernández F, De la Torre P, Laclette JP, Espinoza B. Entomological Indices, Feeding Sources, and Molecular Identification of Triatoma phyllosoma (Hemiptera: Reduviidae) One of the Main Vectors of Chagas Disease in the Istmo de Tehuantepec, Oaxaca, Mexico. Am J Trop Med Hyg. 2011;85(3):490-7.,1010. Izeta-Alberdi A, Pech-May A, Tun-Ku E, Mazariegos-Hidalgo CJ, López-Cancino SA, Gutiérrez S, et al. Trypanosoma cruzi in Mexican Neotropical vectors and mammals: wildlife, livestock, pets, and human population. Salud Pública Mex. 2023;65(2)114-26..

Regarding the distribution of DTUs, our research results are limited to the urban context of the Istmo de Tehuantepec. We mainly detected TcI and reported a mixed infection (TcI-TcII). Concerning the distribution of TcI, our report is similar to that of studies conducted in the Istmo region of Oaxaca, specifically in the municipality of Salina Cruz, where TcI has been isolated from T. phyllosoma1010. Izeta-Alberdi A, Pech-May A, Tun-Ku E, Mazariegos-Hidalgo CJ, López-Cancino SA, Gutiérrez S, et al. Trypanosoma cruzi in Mexican Neotropical vectors and mammals: wildlife, livestock, pets, and human population. Salud Pública Mex. 2023;65(2)114-26.. Therefore, our results support the available literature on the distribution of TcI in this geographic region. Although T. phyllosoma is one of the most important vectors for transmitting T. cruzi in the Istmo de Tehuantepec region, there are no previous reports on T. phyllosoma infected by TcII. Our findings represent the first report of this DTU circulating in the domestic peri-urban cycle of this species. There are currently reports of mixed infections ( TcI and TcVI) in T. dimidiata captured in the Valles Centrales region of Oaxaca State1010. Izeta-Alberdi A, Pech-May A, Tun-Ku E, Mazariegos-Hidalgo CJ, López-Cancino SA, Gutiérrez S, et al. Trypanosoma cruzi in Mexican Neotropical vectors and mammals: wildlife, livestock, pets, and human population. Salud Pública Mex. 2023;65(2)114-26.. Mixed T. cruzi infections have important epidemiological implications, including difficulty in characterizing the variants present in the infected individual, disease progression and severity, as well as resistance to the drugs of choice22. Zingales B, Bartholomeu DC. Trypanosoma cruzi genetic diversity: impact on transmission cycles and Chagas disease. Mem Inst Oswaldo Cruz. 2022, 117:e210193.,1414. Zingales B, Araujo RGA, Moreno M, Franco J, Aguiar PHN, Nunes SL, et al. A novel ABCG-like transporter of Trypanosoma cruzi is involved in natural resistance to benznidazole. Mem Inst Oswaldo Cruz. 2015;110(3):433-44.. To the best of our knowledge, some orders of wild mammals (Chiroptera, rodents, and primates) have been infected with DTU II; however, how this genotype reaches humans remains largely unknown. Further research is thus necessary to determine the potential sources of transmission in the study area1515. Brenière SF, Waleckx E, Barnabé C. Over Six Thousand Trypanosoma cruzi Strains Classified into Discrete Typing Units (DTUs): Attempt at an Inventory. PLoS Negl Trop Dis 2016;10(8):e0004792..

Although our study provides information on the distribution of T. cruzi DTUs in urban environments, understanding the parasite-vector dynamics and their impact on pathogenesis in humans and other domestic animals is necessary. Currently, there are reports of associations between DTUs and the clinical manifestations of Chagas disease33. Guhl F. Geographical distribution of Chagas Disease. In: Telleria J, Tibayrenc M, editors. American Trypanosomiasis Chagas Disease: One Hundred Years of Research. 2nd ed. Elsevier; 2017. 89-112 p.. However, T. cruzi genetic diversity has not been considered in epidemiological surveillance. The inclusion of T. cruzi typing would thus facilitate a better understanding of the molecular epidemiology of this parasite in Mexico and other geographic regions where Chagas disease is endemic.

ACKNOWLEDGMENTS

We thank CONAHCYT, the Instituto de Ciencia, Tecnología e Innovación del Estado de Chiapas (ICTIECH), and ECOSUR for the grants provided for this work. We also thank to the fieldwork team, made up of veterinarians from the Universidad Autónoma de Chiapas (UNACH), biologists from the Universidad de Ciencias y Artes de Chiapas (UNICACH), and medical doctors from the Universidad Intercultural de Chiapas (UNICH). We thank to the laboratory teams from the EEEMA group and the group of the Laboratory of Investigation and Molecular Diagnosis (LIDIAM) of UNICACH. We also thank to the reviewers and editors for their comments.

REFERENCES

  • 1
    World Health Organization (WHO). Chagas disease [Internet]. 2023 [cited 2023 May 23]. Available from: Available from: https://www.who.int/news-room/fact-sheets/detail/chagas-disease-(american-trypanosomiasis)
    » https://www.who.int/news-room/fact-sheets/detail/chagas-disease-(american-trypanosomiasis)
  • 2
    Zingales B, Bartholomeu DC. Trypanosoma cruzi genetic diversity: impact on transmission cycles and Chagas disease. Mem Inst Oswaldo Cruz. 2022, 117:e210193.
  • 3
    Guhl F. Geographical distribution of Chagas Disease. In: Telleria J, Tibayrenc M, editors. American Trypanosomiasis Chagas Disease: One Hundred Years of Research. 2nd ed. Elsevier; 2017. 89-112 p.
  • 4
    Ibáñez-Cervantes G, León-García G, Castro-Escarpulli G, Mancilla-Ramírez J, Victoria-Acosta G, Cureño-Díaz MA, et al. Evolution of incidence and geographical distribution of Chagas disease in Mexico during a decade (2007-2016). Epidemiol Infect. 2019;147:1-7.
  • 5
    Lent H, Wygodzinsky PW. Revision of the Triatominae (Hemiptera, Reduviidae), and their significance as vectors of Chagas’ disease. Bull Am Mus Nat Hist.1979; 163(3);123-520.
  • 6
    Costa J, Dale C, Galvão C, Almeida CE, Dujardin JP. Do the new triatomine species pose new challenges or strategies for monitoring Chagas disease? An overview from 1979-2021. Mem Inst Oswaldo Cruz. 2021;116:1-10.
  • 7
    Ramsey JM, Peterson AT, Carmona-Castro O, Moo-Llanes DA, Nakazawa Y, Butrick M, et al. Atlas of Mexican Triatominae (Reduviidae: Hemiptera) and vector transmission of Chagas disease. Mem Inst Oswaldo Cruz 2015;110(3):339-52.
  • 8
    Benitez Alva JI, Huerta H, Tellez Rendón JL. Distribución de triatominos (Heteroptera: Reduviidae) asociados a la vivienda humana y posibles zonas de riesgo en seis Estados de la República Mexicana. BIOCYT. 2012;5(17):327-40.
  • 9
    Villalobos G, Martínez-Hernández F, De la Torre P, Laclette JP, Espinoza B. Entomological Indices, Feeding Sources, and Molecular Identification of Triatoma phyllosoma (Hemiptera: Reduviidae) One of the Main Vectors of Chagas Disease in the Istmo de Tehuantepec, Oaxaca, Mexico. Am J Trop Med Hyg. 2011;85(3):490-7.
  • 10
    Izeta-Alberdi A, Pech-May A, Tun-Ku E, Mazariegos-Hidalgo CJ, López-Cancino SA, Gutiérrez S, et al. Trypanosoma cruzi in Mexican Neotropical vectors and mammals: wildlife, livestock, pets, and human population. Salud Pública Mex. 2023;65(2)114-26.
  • 11
    Rodrigues-dos-Santos Í, Melo MF, De Castro L, Hasslocher-Moreno AM, Do Brasil PEAA, Silvestre De Sousa A, et al. Exploring the parasite load and molecular diversity of Trypanosoma cruzi in patients with chronic Chagas disease from different regions of Brazil. PLoS Negl Trop Dis. 2018;12(11):1-19.
  • 12
    Mazzotti L. Dos casos de enfermedad de Chagas en el estado de Oaxaca. Gac Med Mex. 1940;70:417-20.
  • 13
    Fernández-Santos NA, Trujillo-García JC, Hamer SA, Wei L, Martínez-Montoya H, Tamez-Guerra P, et al. Domestic Triatoma spp. Infections with Trypanosoma cruzi, Household Infestations, and Molecular Identification in Oaxaca, México. Insects. 2022;13(12):1-11.
  • 14
    Zingales B, Araujo RGA, Moreno M, Franco J, Aguiar PHN, Nunes SL, et al. A novel ABCG-like transporter of Trypanosoma cruzi is involved in natural resistance to benznidazole. Mem Inst Oswaldo Cruz. 2015;110(3):433-44.
  • 15
    Brenière SF, Waleckx E, Barnabé C. Over Six Thousand Trypanosoma cruzi Strains Classified into Discrete Typing Units (DTUs): Attempt at an Inventory. PLoS Negl Trop Dis 2016;10(8):e0004792.
  • Financial Support: Consejo Nacional de Humanidades, Ciencia y Tecnología (CONAHCYT), Project number: A1-S-47901.

Publication Dates

  • Publication in this collection
    25 Mar 2024
  • Date of issue
    2024

History

  • Received
    09 Oct 2023
  • Accepted
    16 Feb 2024
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