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Morphological and transcriptomic effects of endocrine modulators on the gonadal differentiation of chicken embryos: the case of tributyltin (TBT)

ABSTRACT: Chicken eggs (Gallus gallus domesticus) were incubated, after 24 h of incubation either non-injected (control, C), or injected with the solvent sesame oil (Oleum Sesame Raffinatum, solvent control, SC), and the substances Tributyltin (TBT, 10pg TBT-SN/g egg) or 17alpha-Methyltestosteron (MT, 30 pg/g egg). Animals were decapitated on breeding day 19, 2 days before anticipated hatching. Right and left gonads of female and male chicken were accurately separated from adhesing tissues, stored in RNA lysis buffer (Promega) at -80°C until until RNA isolation with the SV Total RNA Isolation System Kit according to manual 048 (Promega). Sequencing was performed on Illumina’s Genome Analyzer IIx, and subsequent base calling was carried out by Illumina’s GAPipeline. Our study represents the first detailed analysis of whole chicken gonad transcriptomes, with biologic replicates, generated by SuperSAGE technology.

ORGANISM(S): Gallus gallus

PROVIDER: GSE108141 | GEO | 2017/12/15

SECONDARY ACCESSION(S): PRJNA422574

REPOSITORIES: GEO

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Project description:In a recent egg injection study, we showed that in ovo exposure to perfluorohexane sulfonate (PFHxS) affects the pipping success of developing chicken (Gallus gallus domesticus) embryos. We also found evidence of thyroid hormone (TH) pathway interference at multiple levels of biological organization (i.e. somatic growth, mRNA expression and circulating free thyroxine levels). Based on these findings, we hypothesize that PFHxS exposure interferes with TH-dependent neurodevelopmental pathways. The present study investigates global transcriptional profiles of cerebral cortex tissue from chicken embryos following exposure to a solvent control, 890 or 38,000 ng PFHxS/g egg (n=4-5 per group); doses which lead to the adverse effects above. PFHxS significantly alters the expression (≥1.5-fold, p≤0.001) of 11 transcripts at the low dose (LD; 890 ng/g) and 101 transcripts at the high dose (HD; 38,000 ng/g). Functional enrichment analysis shows that PFHxS affects genes involved in tissue development and morphology, cellular assembly and organization, and cell-to-cell signalling. Pathway and interactome analyses suggest that genes may be affected through several potential regulatory molecules, including integrin receptors, myelocytomatosis viral oncogene and CCAAT/enhancer binding protein. This study identifies key functional and regulatory modes of PFHxS action involving TH-dependent and -independent neurodevelopmental pathways. Some of these TH-dependent mechanisms that occur during embryonic development include tight junction formation, signal transduction and integrin signaling, while TH-independent mechanisms include gap junction intercellular communication. Reference Design. Reference = pool of equal parts of all control and treated samples. Control groups and 2 treatment groups. Control samples were chicken embryonic cerebral cortex exposed DMSO only (solvent). Treatments were: chicken embryonic cerebral cortex exposed to 890 ng/g PFHxS (LD) and 38,000 ng/g PFHxS (HD).

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Morphological and transcriptomic effects of endocrine modulators on the gonadal differentiation of chicken embryos: the case of tributyltin (TBT)

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