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Transcriptional Profiling of Primordial Germ Cells During Chicken Embryonic Development
Mingyang Jin1, Jingkang Huang1, Chao Qin1
1Shanghai Key Laboratory of Veterinary Biotechnology, Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
Insights
This study characterized chicken primordial germ cells (PGCs) using RNA sequencing, revealing stage- and sex-associated gene expression differences. Findings offer insights into PGC development and potential biotechnological applications in poultry.
Area of Science:
- Poultry genetics and developmental biology.
- Cellular and molecular biology.
Background:
- Primordial germ cells (PGCs) are crucial for avian reproduction, germplasm conservation, and genetic modification.
- Understanding PGC development, migration, and sex differentiation is vital for poultry biotechnology.
Purpose of the Study:
- To characterize the transcriptomic landscape of chicken PGCs at different developmental stages (circulating and gonad-derived).
- To identify stage- and sex-associated transcriptional programs influencing PGC development and colonization.
Main Methods:
- Isolation and RNA sequencing of circulating and gonad-derived PGCs from Silkie chicken embryos at 2.5 and 8.5 days of incubation.
- Comparative transcriptomic analysis to identify differentially expressed genes and pathways.
- Analysis of sex-biased gene expression related to W- and Z-linked chromosomes and autosomes.
Main Results:
- Significant stage-associated differences were observed in pathways like cell-matrix interaction, focal adhesion, PI3K-Akt signaling, and stem cell pluripotency.
- Sex-biased gene expression was detected early (circulating PGCs) and increased after gonadal colonization, with more autosomal genes involved.
- Candidate genes (e.g., HINTW, DMRT1, SOX2) and pathways (e.g., ECM-receptor interaction, calcium signaling) were identified for future research.
Conclusions:
- The study provides a descriptive transcriptomic resource for chicken PGC biology and biotechnology.
- Identified genes and pathways offer potential targets for understanding PGC development and sex differentiation.
- Further functional studies are needed to establish causal mechanisms due to the descriptive nature of the findings.
Abstract:
Primordial germ cells (PGCs) are the earliest precursors of gametes and essential cellular materials for poultry germplasm conservation and genetic modification. In this study, PGCs isolated from 2.5-day male and female Silkie chicken embryos were defined as circulating PGCs (cPGC_M and cPGC_F), whereas PGCs isolated from 8.5-day male and female embryos were defined as gonad-derived PGCs (gPGC_M and gPGC_F). RNA sequencing with three biological replicates per group was performed to characterize developmental-stage- and sex-associated transcriptional programs. Comparative transcriptomic analyses identified stage-associated differences in pathways related to cell-matrix interaction, focal adhesion, PI3K-Akt signaling, and stem cell pluripotency, with more differentially expressed genes detected in the female than in the male stage comparison. Sex-biased expression was detectable at the circulating stage, mainly reflecting W- and Z-linked expression differences, and the number of sex-biased genes was greater after gonadal colonization, primarily because more autosomal differentially expressed genes were detected. Candidate genes and pathways, including HINTW, DMRT1, SOX2, EDNRB, LPAR4, GFRA3, ECM-receptor interaction, ribosome-related modules, and calcium signaling, were associated with these comparisons and are presented as targets for future validation rather than as confirmed regulators. Because the study used three biological replicates per group, RT-qPCR corroboration was limited to six female stage-associated genes, and no functional perturbation assays were performed, the findings are descriptive and do not establish causal mechanisms of PGC migration, gonadal colonization, or sex differentiation. Within these limitations, the dataset provides an exploratory resource for subsequent studies of chicken PGC biology and biotechnology.
