Castañeda-Cortés, Diana C.; Zhang, Jing; Boan, Agustín F.; Langlois, Valérie S. 
ORCID: https://orcid.org/0000-0003-4031-6838 et Fernandino, Juan I.
(2020).
High temperature stress response is not sexually dimorphic at the whole-body level and is dependent on androgens to induce sex reversal.
General and Comparative Endocrinology
, vol. 299
.
p. 113605.
DOI: 10.1016/j.ygcen.2020.113605.
Résumé
The understanding of the molecular and endocrine mechanisms behind environmentally-induced sex reversal in fish is of great importance in the context of predicting the potential effects of climate change, especially increasing temperature. Here, we demonstrate the global effects of high temperature on genome-wide transcription in medaka (Oryzias latipes) during early development. Interestingly, data analysis did not show sexual dimorphic changes, demonstrating that thermal stress is not dependent on genotypic sex. Additionally, our results revealed significant changes in several pathways under high temperature, such as stress response from brain, steroid biosynthesis, epigenetic mechanisms, and thyroid hormone biosynthesis, among others. These microarray data raised the question of what the exact molecular and hormonal mechanisms of action are for female-to-male sex reversal under high temperatures in fish. Complementary gene expression analysis revealed that androgen-related genes increase in females (XX) experiencing high water temperature. To test the involvement of androgens in thermal-induced sex reversal, an androgen antagonist was used to treat XX medaka under a high-temperature setup. Data clearly demonstrated failure of female-to-male sex reversal when androgen action is inhibited, corroborating the importance of androgens in environmentally-induced sex reversal.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | sex determination; sex reversal; environmental stressors; temperature increase |
| Centre: | Centre Eau Terre Environnement |
| Date de dépôt: | 09 juin 2021 15:48 |
| Dernière modification: | 10 févr. 2022 21:26 |
| URI: | https://espace.inrs.ca/id/eprint/11497 |
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