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In Vivo RNA Interference of a Gonad-Specific Transforming Growth Factor-β in the Pacific Oyster Crassostrea gigas

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Abstract

We investigated the role of oyster gonadal TGFβ (og-TGFβ) in the reproduction of Crassostrea gigas, using an in vivo RNA interference approach. We designed double-stranded RNA targeting og-TGFβ, which is specifically expressed in the somatic cells surrounding germ cells in the gonad of both male and female oysters. In vivo injection of this og-TGFβ dsRNA into the gonad led to knock-down phenotypes for both sexes, with significant reduction (77.52% relative to controls) of the gonad area, lowered reproductive effort and germ cell under-proliferation. Interestingly, half of the injected females halted their vitellogenesis, since we were only able to observe pre-vitellogenic oocytes. In addition, apoptotic germ cells and haemocytes infiltrated into the gonad, likely as part of the active resorption of degenerating germ cells. Conversely, males showed a normal phenotype at the cellular level, with spermatids and spermatozoids observed in the gonads of control and injected males. As a result, og-TGFβ appears to play an essential role in C. gigas germ cell development by functioning as an activator of germ cell proliferation in both male and female oysters and vitellogenesis in females.

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Acknowledgements

This study was conducted as part of the ANR “Gametogenes” (contract n° ANR-08-GENM-041) and the GIS Europole mer “OxyGenes” projects. Many thanks to P. Favrel and C. Lelong for helpful discussions. We thank all the staff of the Argenton experimental hatchery for conditioning the oysters and H. McCombie for her help with the English.

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Correspondence to Arnaud Huvet.

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Huvet, A., Fleury, E., Corporeau, C. et al. In Vivo RNA Interference of a Gonad-Specific Transforming Growth Factor-β in the Pacific Oyster Crassostrea gigas . Mar Biotechnol 14, 402–410 (2012). https://doi.org/10.1007/s10126-011-9421-4

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  • DOI: https://doi.org/10.1007/s10126-011-9421-4

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