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Is there a barrier of reproductive isolation between the different cytotypes of Triatoma sordida (Stal, 1859) (Hemiptera, Triatominae)?

Grant number: 18/24116-1
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): February 01, 2019
Effective date (End): December 31, 2019
Field of knowledge:Biological Sciences - Genetics - Animal Genetics
Principal Investigator:Kaio Cesar Chaboli Alevi
Grantee:Luiza Maria Grzyb Delgado
Host Institution: Faculdade de Ciências Farmacêuticas (FCFAR). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil


Triatoma sordida is one of the main species with vectorial competence for the transmission of Chagas' disease in Brazil. Several studies indicate polymorphism in T. sordida, which led to the suggestion of the phenomenon of cryptic speciation in this species. Cytogenetic studies with C-Banding and Fluorescent In Situ Hybridization (FISH) demonstrated the presence of three cytotypes, possibly representing different taxa: cytotype I, termed T. sordida sensu stricto, with heterochromatin in all autosomes and 45S rDNA probe in the chromosome X, cytotype II, designated as T. sordida Argentina, with absence of heterochromatin in the autosomes and FISH labeling on sex chromosomes X and Y and cytotype III, designated as T. sordida La Paz, with heterochromatin in all autosomes and marking in a pair of autosomes. Taking into account that the accomplishment of experimental crosses can help in different aspects, such as the understanding of taxonomy, systematics and isolation mechanisms that limit gene flow, as well as the possibility of evaluating the role of natural hybridization in the generation of new genetic variants, the present project aims to analyze the possible barriers of reproductive isolation (pre- or post-zygotic) present between the three cytotypes of T. sordida, by means of experimental crosses and analysis of the resulting hybrids up to the second generation (F2), with emphasis on the analysis of the evolutionary dynamics of the experimental crosses, as well as the analysis of the reproductive viability of the hybrids (spermatogenesis and morphology of male and female gonads). These results will allow elucidating evolutionary and taxonomic questions about T. sordida and the process of cryptic speciation.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CHABOLI ALEVI, KAIO CESAR; DE OLIVEIRA, JADER; CANIS GARCIA, ARIANE CRISTINA; CRISTAL, DANIEL CESARETTO; GRZYB DELGADO, LUIZA MARIA; BITTINELLI, ISADORA DE FREITAS; DOS REIS, YAGO VISINHO; RAVAZI, AMANDA; BORTOLOZO DE OLIVEIRA, ANA BEATRIZ; GALVAO, CLEBER; et al. Triatoma rosai sp. nov. (Hemiptera, Triatominae): A New Species of Argentinian Chagas Disease Vector Described Based on Integrative Taxonomy. INSECTS, v. 11, n. 12, . (18/12039-2, 17/05015-7, 18/24116-1, 20/07917-0)
MADEIRA, FERNANDA FERNANDEZ; GRZYB DELGADO, LUIZA MARIA; BITTINELLI, ISADORA DE FREITAS; DE OLIVEIRA, JADER; RAVAZI, AMANDA; DOS REIS, YAGO VISINHO; BORTOLOZO DE OLIVEIRA, ANA BEATRIZ; CRISTAL, DANIEL CESARETTO; GALVAO, CLEBER; VILELA DE AZEREDO-OLIVEIRA, MARIA TERCILIA; et al. Triatoma sordida (Hemiptera, Triatominae) from La Paz, Bolivia: an incipient species or an intraspecific chromosomal polymorphism?. PARASITES & VECTORS, v. 14, n. 1, . (17/05015-7, 19/17581-2, 18/12039-2, 18/24116-1)
CARIS GARCIA, ARIANE CRISTINA; DE OLIVEIRA, JADER; CRISTAL, DANIEL CESARETTO; GRZYB DELGADO, LUIZA MARIA; BITTINELLI, ISADORA DE FREITAS; GALVAO, CLEBER; GONZALEZ BRITEZ, NILSA ELIZABETH; CARRASCO, HERNAN JOSE; DA ROSA, JOAO ARISTEU; CHABOLI ALEVI, KAIO CESAR. Intraspecific and Interspecific Phenotypic Differences Confirm the Absence of Cryptic Speciation in Triatoma sordida (Hemiptera, Triatominae). American Journal of Tropical Medicine and Hygiene, v. 105, n. 6, p. 1759-1766, . (19/17581-2, 18/24116-1, 17/05015-7, 18/12039-2)

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