RNA-seq of ovarian follicles in Japanese quail
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ABSTRACT:
PROVIDER: PRJEB11185 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:In this study, we used RNA-seq to identify differences in gene expression patterns in ovarian follicles of female Japanese quail (Coturnix coturnix japonica) that produce large versus small eggs relative to their body size. A high quality reference genome is currently under construction by the Quail Genome Consortium (BioProject ID: PRJNA292031).
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Project description:Since Japanese quail and chicken belong to the same order Galliforms, DNA sequence of both species are highly conserved and proved to be applicable for various analyses each other. Quail are commonly used to address physiological questions for reasons of economy. To test whether chicken microarrays are useful to quail samples, we compared hybridization signals of chicken and quail genomic DNA on Affymetrix chicken genome array. Experiment Overall Design: Genomic DNA of female chicken and quail were extracted individually from liver of three birds and hybridized on Affymetrix microarrays. Samples were analyzed in triplicate set of array (three biological replicates).
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Project description:Japanese quail (Coturnix coturnix japonica) reach sexual maturity early, breed rapidly and successfully, and cost less and require less space than other birds raised for their meat and eggs. Given the value of this species for commercial production and experimental use as well as recent increasing demand, more studies are necessary to determine chromosomal regions and genes associated with gender and breed-differentiation in the species. Identification of sex-related genes can help target chromosomal regions for molecular sexing purposes. This study employed Trinity and edgeR for transcriptome analysis of next-generation RNA-seq data, which included 4 tissues obtained from 3 different breeds of Japanese quail (wild, miniature, and jumbo). The initial goal was to identify genes related to sexual dimorphism, as well as potential novel candidate genes for molecular sexing. Analysis and interpretation of differentially expressed genes shared between female and male tissue contrast groups provided insight into sex-related differences. Several of the genes identified in the present study as significant sex-related genes have been previously found in avian gene expression analyses (e.g. NIPBL, UBAP2), and other genes found differentially expressed in this study and not previously associated with sex-related differences may be considered potential candidates for molecular sexing (e.g. TERA, MYP0, PPR17, CASQ2). Additionally, other genes likely associated with neuronal and brain development (e.g. CHKA, NYAP), as well as body development and size differentiation (e.g. ANKRD26, GRP87) in quail were identified. Expression of homeobox protein regulating genes in the sex-related contrast group revealed two genes (HXC4, ISL1) that may regulate sex-specific anatomical development. Results of these analyses expand the currently limited pool of knowledge on the genetic features of the quail breed and could allow for more effective molecular sexing as well as selective breeding for traits important in commercial production. This study employed Trinity and edgeR for transcriptome analysis of next-generation RNA-seq data, which included 4 tissues obtained from 3 different breeds of Japanese quail (wild, miniature, and jumbo).
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Project description:Chemical risk assessment for avian species typically depends on information from toxicity tests performed in adult birds. Early-life stage (ELS) toxicity tests have been proposed as an attractive alternative, but incorporation of these data into existing frameworks will require knowledge about the similarities/differences between ELS and adult responses. The present study uses transcriptomics to assess hepatic gene expression in ELS and adult Japanese quail following exposure to ethinylestradiol (EE2). ELS quail were dosed with 0, 3.33, and 33.3 µg EE2/g egg via air cell injection prior to incubation. Adult quail were fed a single dose of EE2 at 0, 0.5, and 5 mg/kg body weight by gavage. Liver tissue was collected from 5-6 individuals per dose group at mid-incubation for ELS quail, and 4 days after dosing for adult birds. A total of 283 and 111 differentially expressed genes (DEGs) were detected in ELS and adult quail, respectively, 16 of which were shared across life stages. Shared DEGs included estrogenic biomarkers such as vitellogenin genes and Apovitellenin-1. For the dose groups that resulted in the highest number of DEGs (ELS [3.3 µg/g]; adult [5 mg/kg]), 21 and 35 KEGG pathways were enriched, respectively. Ten of these pathways were shared between life stages, including pathways involved with signaling molecules and interaction, and endocrine system. Taken together, our results suggest conserved mechanisms of action following estrogenic exposure across two life stages, with evidence from differentially expressed genes and enriched pathways. This study contributes to the development and evaluation of toxicogenomic and ELS approaches as alternative toxicity testing methods and supports the use of the ELS test for screening estrogenic chemicals.
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Project description:Chemical risk assessment for avian species typically depends on information from toxicity tests performed in adult birds. Early-life stage (ELS) toxicity tests have been proposed as an attractive alternative, but incorporation of these data into existing frameworks will require knowledge about the similarities/differences between ELS and adult responses. The present study uses transcriptomics to assess hepatic gene expression in ELS and adult Japanese quail following exposure to ethinylestradiol (EE2). ELS quail were dosed with 0, 3.33, and 33.3 µg EE2/g egg via air cell injection prior to incubation. Adult quail were fed a single dose of EE2 at 0, 0.5, and 5 mg/kg body weight by gavage. Liver tissue was collected from 5-6 individuals per dose group at mid-incubation for ELS quail, and 4 days after dosing for adult birds. A total of 283 and 111 differentially expressed genes (DEGs) were detected in ELS and adult quail, respectively, 16 of which were shared across life stages. Shared DEGs included estrogenic biomarkers such as vitellogenin genes and Apovitellenin-1. For the dose groups that resulted in the highest number of DEGs (ELS [3.3 µg/g]; adult [5 mg/kg]), 21 and 35 KEGG pathways were enriched, respectively. Ten of these pathways were shared between life stages, including pathways involved with signaling molecules and interaction, and endocrine system. Taken together, our results suggest conserved mechanisms of action following estrogenic exposure across two life stages, with evidence from differentially expressed genes and enriched pathways. This study contributes to the development and evaluation of toxicogenomic and ELS approaches as alternative toxicity testing methods and supports the use of the ELS test for screening estrogenic chemicals.
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