Tilapia sex determination: Where temperature and genetics meet
This review deals with the complex sex determining system of Nile tilapia, Oreochromis niloticus, governed by the interactions between a genetic determination and the influence of temperature, shown in both domestic and wild populations. Naturally sex reversed individuals are strongly suggested in two wild populations. This can be due to the masculinising temperatures which some fry encounter during their sex differentiation period when they colonise shallow waters, and/or to the influence of minor genetic factors. Differences regarding a) thermal responsiveness of sex ratios between and within Nile tilapia populations, b) maternal and paternal effects on temperature dependent sex ratios and c) nearly identical results in offspring of repeated matings, demonstrate that thermosensitivity is under genetic control. Selection experiments to increase the thermosensitivity revealed high responses in the high and low sensitive lines. The high-line showed ~ 90% males after 2 generations of selection whereas the weakly sensitive line had 54% males. This is the first evidence that a surplus of males in temperature treated groups can be selected as a quantitative trait. Expression profiles of several genes (Cyp19a, Foxl2, Amh, Sox9a,b) from the gonad and brain were analysed to define temperature action on the sex determining/differentiating cascade in tilapia. The coexistence of GSD and TSD is discussed.
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Subjects: | L53 - Physiologie animale - Reproduction, M12 - Production de l'aquaculture, Oreochromis niloticus, température, génétique animale, détermination du sexe, différenciation sexuelle, http://aims.fao.org/aos/agrovoc/c_34687, http://aims.fao.org/aos/agrovoc/c_7657, http://aims.fao.org/aos/agrovoc/c_49986, http://aims.fao.org/aos/agrovoc/c_14226, http://aims.fao.org/aos/agrovoc/c_26822, |
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dig-cirad-fr-5489922024-01-28T16:59:57Z http://agritrop.cirad.fr/548992/ http://agritrop.cirad.fr/548992/ Tilapia sex determination: Where temperature and genetics meet. Baroiller Jean-François, D'Cotta Helena, Bezault Etienne, Wessels Stephan, Hoerstgen-Schwark G.. 2009. Comparative Biochemistry and Physiology. Part A, Molecular and Integrative Physiology, 153 (1) : 30-38. International Symposium on Fish Endocrinology. 6, Calgary, Canada, 23 Juin 2008/26 Juin 2008.https://doi.org/10.1016/j.cbpa.2008.11.018 <https://doi.org/10.1016/j.cbpa.2008.11.018> Tilapia sex determination: Where temperature and genetics meet Baroiller, Jean-François D'Cotta, Helena Bezault, Etienne Wessels, Stephan Hoerstgen-Schwark, G. eng 2009 Comparative Biochemistry and Physiology. Part A, Molecular and Integrative Physiology L53 - Physiologie animale - Reproduction M12 - Production de l'aquaculture Oreochromis niloticus température génétique animale détermination du sexe différenciation sexuelle http://aims.fao.org/aos/agrovoc/c_34687 http://aims.fao.org/aos/agrovoc/c_7657 http://aims.fao.org/aos/agrovoc/c_49986 http://aims.fao.org/aos/agrovoc/c_14226 http://aims.fao.org/aos/agrovoc/c_26822 This review deals with the complex sex determining system of Nile tilapia, Oreochromis niloticus, governed by the interactions between a genetic determination and the influence of temperature, shown in both domestic and wild populations. Naturally sex reversed individuals are strongly suggested in two wild populations. This can be due to the masculinising temperatures which some fry encounter during their sex differentiation period when they colonise shallow waters, and/or to the influence of minor genetic factors. Differences regarding a) thermal responsiveness of sex ratios between and within Nile tilapia populations, b) maternal and paternal effects on temperature dependent sex ratios and c) nearly identical results in offspring of repeated matings, demonstrate that thermosensitivity is under genetic control. Selection experiments to increase the thermosensitivity revealed high responses in the high and low sensitive lines. The high-line showed ~ 90% males after 2 generations of selection whereas the weakly sensitive line had 54% males. This is the first evidence that a surplus of males in temperature treated groups can be selected as a quantitative trait. Expression profiles of several genes (Cyp19a, Foxl2, Amh, Sox9a,b) from the gonad and brain were analysed to define temperature action on the sex determining/differentiating cascade in tilapia. The coexistence of GSD and TSD is discussed. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/548992/1/document_548992.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1016/j.cbpa.2008.11.018 10.1016/j.cbpa.2008.11.018 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cbpa.2008.11.018 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1016/j.cbpa.2008.11.018 |
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L53 - Physiologie animale - Reproduction M12 - Production de l'aquaculture Oreochromis niloticus température génétique animale détermination du sexe différenciation sexuelle http://aims.fao.org/aos/agrovoc/c_34687 http://aims.fao.org/aos/agrovoc/c_7657 http://aims.fao.org/aos/agrovoc/c_49986 http://aims.fao.org/aos/agrovoc/c_14226 http://aims.fao.org/aos/agrovoc/c_26822 L53 - Physiologie animale - Reproduction M12 - Production de l'aquaculture Oreochromis niloticus température génétique animale détermination du sexe différenciation sexuelle http://aims.fao.org/aos/agrovoc/c_34687 http://aims.fao.org/aos/agrovoc/c_7657 http://aims.fao.org/aos/agrovoc/c_49986 http://aims.fao.org/aos/agrovoc/c_14226 http://aims.fao.org/aos/agrovoc/c_26822 |
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L53 - Physiologie animale - Reproduction M12 - Production de l'aquaculture Oreochromis niloticus température génétique animale détermination du sexe différenciation sexuelle http://aims.fao.org/aos/agrovoc/c_34687 http://aims.fao.org/aos/agrovoc/c_7657 http://aims.fao.org/aos/agrovoc/c_49986 http://aims.fao.org/aos/agrovoc/c_14226 http://aims.fao.org/aos/agrovoc/c_26822 L53 - Physiologie animale - Reproduction M12 - Production de l'aquaculture Oreochromis niloticus température génétique animale détermination du sexe différenciation sexuelle http://aims.fao.org/aos/agrovoc/c_34687 http://aims.fao.org/aos/agrovoc/c_7657 http://aims.fao.org/aos/agrovoc/c_49986 http://aims.fao.org/aos/agrovoc/c_14226 http://aims.fao.org/aos/agrovoc/c_26822 Baroiller, Jean-François D'Cotta, Helena Bezault, Etienne Wessels, Stephan Hoerstgen-Schwark, G. Tilapia sex determination: Where temperature and genetics meet |
description |
This review deals with the complex sex determining system of Nile tilapia, Oreochromis niloticus, governed by the interactions between a genetic determination and the influence of temperature, shown in both domestic and wild populations. Naturally sex reversed individuals are strongly suggested in two wild populations. This can be due to the masculinising temperatures which some fry encounter during their sex differentiation period when they colonise shallow waters, and/or to the influence of minor genetic factors. Differences regarding a) thermal responsiveness of sex ratios between and within Nile tilapia populations, b) maternal and paternal effects on temperature dependent sex ratios and c) nearly identical results in offspring of repeated matings, demonstrate that thermosensitivity is under genetic control. Selection experiments to increase the thermosensitivity revealed high responses in the high and low sensitive lines. The high-line showed ~ 90% males after 2 generations of selection whereas the weakly sensitive line had 54% males. This is the first evidence that a surplus of males in temperature treated groups can be selected as a quantitative trait. Expression profiles of several genes (Cyp19a, Foxl2, Amh, Sox9a,b) from the gonad and brain were analysed to define temperature action on the sex determining/differentiating cascade in tilapia. The coexistence of GSD and TSD is discussed. |
format |
article |
topic_facet |
L53 - Physiologie animale - Reproduction M12 - Production de l'aquaculture Oreochromis niloticus température génétique animale détermination du sexe différenciation sexuelle http://aims.fao.org/aos/agrovoc/c_34687 http://aims.fao.org/aos/agrovoc/c_7657 http://aims.fao.org/aos/agrovoc/c_49986 http://aims.fao.org/aos/agrovoc/c_14226 http://aims.fao.org/aos/agrovoc/c_26822 |
author |
Baroiller, Jean-François D'Cotta, Helena Bezault, Etienne Wessels, Stephan Hoerstgen-Schwark, G. |
author_facet |
Baroiller, Jean-François D'Cotta, Helena Bezault, Etienne Wessels, Stephan Hoerstgen-Schwark, G. |
author_sort |
Baroiller, Jean-François |
title |
Tilapia sex determination: Where temperature and genetics meet |
title_short |
Tilapia sex determination: Where temperature and genetics meet |
title_full |
Tilapia sex determination: Where temperature and genetics meet |
title_fullStr |
Tilapia sex determination: Where temperature and genetics meet |
title_full_unstemmed |
Tilapia sex determination: Where temperature and genetics meet |
title_sort |
tilapia sex determination: where temperature and genetics meet |
url |
http://agritrop.cirad.fr/548992/ http://agritrop.cirad.fr/548992/1/document_548992.pdf |
work_keys_str_mv |
AT baroillerjeanfrancois tilapiasexdeterminationwheretemperatureandgeneticsmeet AT dcottahelena tilapiasexdeterminationwheretemperatureandgeneticsmeet AT bezaultetienne tilapiasexdeterminationwheretemperatureandgeneticsmeet AT wesselsstephan tilapiasexdeterminationwheretemperatureandgeneticsmeet AT hoerstgenschwarkg tilapiasexdeterminationwheretemperatureandgeneticsmeet |
_version_ |
1792497183729123328 |