| Autor: |
Sensato Azevedo, Luísa Martins, Cesaretto, Natália Regina, de Oliveira, Jader, Ravazi, Amanda, dos Reis, Yago Visinho, Antoniassi Fernandes Tadini, Samanta Cristina, da Silva Masarin, Isabella, Borsatto, Kelly Cristine, Galvão, Cleber, da Rosa, João Aristeu, de Azeredo‑Oliveira, Maria Tercília Vilela, Chaboli Alevi, Kaio Cesar |
| Zdroj: |
Parasites & Vectors; 10/27/2023, Vol. 16 Issue 1, p1-7, 7p, 3 Color Photographs, 1 Chart |
| Abstrakt: |
Background Hybridization events between Triatoma spp. have been observed under both natural and laboratory conditions. The ability to produce hybrids can influence different aspects of the parent species, and may even result in events of introgression, speciation and extinction. Hybrid sterility is caused by unviable gametes (due to errors in chromosomal pairing [meiosis]) or by gonadal dysgenesis (GD). All of the triatomine hybrids analyzed so far have not presented GD. We describe here for the first time GD events in triatomine hybrids and highlight these taxonomic and evolutionary implications of these events. Methods Reciprocal experimental crosses were performed between Triatoma longipennis and Triatoma mopan. Inter‑ crosses were also performed between the hybrids, and backcrosses were performed between the hybrids and the par‑ ent species. In addition, morphological and cytological analyzes were performed on the atrophied gonads of the hybrids. Results Hybrids were obtained only for the crosses T. mopan♀ × T. longipennis♂. Intercrosses and backcrosses did not result in offspring. Morphological analyses of the male gonads of the hybrids confirmed that the phenomenon that resulted in sterility of the hybrid was bilateral GD (the gonads of the hybrids were completely atrophied). Cyto‑ logical analyses of the testes of the hybrids also confirmed GD, with no germ cells observed (only somatic cells, which make up the peritoneal sheath). Conclusions The observations made during this study allowed us to characterize, for the first time, GD in tri‑ atomines and demonstrated that gametogenesis does not occur in atrophied gonads. The characterization of GD in male hybrids resulting from the crossing of T. mopan♀ × T. longipennis♂ highlights the importance of evaluating both the morphology and the cytology of the gonads to confirm which event resulted in the sterility of the hybrid: GD (which results in no gamete production) or meiotic errors (which results in non-viable gametes). [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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