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. 2021 Dec 3:12:779689.
doi: 10.3389/fphys.2021.779689. eCollection 2021.

Impacts of Embryonic Thermal Programming on the Expression of Genes Involved in Foie gras Production in Mule Ducks

Affiliations

Impacts of Embryonic Thermal Programming on the Expression of Genes Involved in Foie gras Production in Mule Ducks

William Massimino et al. Front Physiol. .

Abstract

Embryonic thermal programming has been shown to improve foie gras production in overfed mule ducks. However, the mechanisms at the origin of this programming have not yet been characterized. In this study, we investigated the effect of embryonic thermal manipulation (+1°C, 16 h/24 h from embryonic (E) day 13 to E27) on the hepatic expression of genes involved in lipid and carbohydrate metabolisms, stress, cell proliferation and thyroid hormone pathways at the end of thermal manipulation and before and after overfeeding (OF) in mule ducks. Gene expression analyses were performed by classic or high throughput real-time qPCR. First, we confirmed well-known results with strong impact of OF on the expression of genes involved in lipid and carbohydrates metabolisms. Then we observed an impact of OF on the hepatic expression of genes involved in the thyroid pathway, stress and cell proliferation. Only a small number of genes showed modulation of expression related to thermal programming at the time of OF, and only one was also impacted at the end of the thermal manipulation. For the first time, we explored the molecular mechanisms of embryonic thermal programming from the end of heat treatment to the programmed adult phenotype with optimized liver metabolism.

Keywords: duck; embryonic thermal programming; gene expression; liver; metabolism.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

FIGURE 1
FIGURE 1
Experimental design. Incubation period extends from embryonic day 1 (E1) to day 30 (E30), day of peak hatching of the ducklings. The thermal manipulation (TM) was performed between E13 and E27, with a temperature increase of 1°C (16 h/24 h) and relative humidity (RH) adjusted to 63%. Overfeeding began at 83 days of age (D83) and ended at 95 days (D95). Liver samplings for RNA extraction are indicated by an arrow at the end of the TM (E27) and before (D83) and after (D95) overfeeding.
FIGURE 2
FIGURE 2
Hepatic relative expression of genes directly influenced by heat treatment at E27. Column representation of the relative expression of HSPA2 (A), HSP90AA1 (B), DNAJB12 (C), and HSF3 (D) at the end of the thermal manipulation in the liver of control (CTR) or thermal manipulated (TM) duck embryos. Data are presented as mean +/– SEM (n = 18–19). *P < 0.05, **P < 0.01, ****P < 0.0001.
FIGURE 3
FIGURE 3
Hepatic relative expression at the end of the heat treatment (E27) of genes influenced by TM before or after overfeeding. Column representation of the relative expression of GPAT1 (A), APOB (B), DIO3 (C), HSBP1 (D), PSMD12 (E) and UBQLN1 (F) at the end of the thermal manipulation in the liver of control (CTR) or thermal manipulated (TM) duck embryos. Data are presented as mean +/– SEM (n = 16–19). **P < 0.01. The absence of a star means that there is no statistical difference between the groups.

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