ArticlePoultry science2026
Transcriptome sequencing reveals the regulatory mechanisms during the development of small white follicles to small yellow follicles in laying hens.
Article in Poultry science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The egg laying process of poultry is determined by follicular development. In the present study, hens with lower egg production rates had significantly fewer small white follicles than those with higher rates. In order to investigate the regulatory mechanisms governing the development from white follicles to yellow follicles, transcriptome sequencing was performed on small white follicles (SWFs), small yellow follicles (SYFs) and F6 (the smallest hierarchical follicles) of high-yield laying hens. Pathways enrichment analysis revealed that the vascular endothelial growth factor (VEGF) signaling, peroxisome proliferator-activated receptor (PPAR) signaling, tight junction and gap junction pathways, as well as steroid hormone biosynthesis were involved in follicular development. Compared with the transition from SYFs to F6, the transition from SWFs to SYFs showed more pronounced changes in gene expression profiles. This was validated by Western blot analysis, which revealed significantly upregulated expression of angiogenesis-related proteins (VEGF, VEGFR1, VEGFR2, ANGPT1 and ANGPT2) and downregulated expression of pigment epithelium derived factor (PEDF) in SYFs compared to SWFs. Immunofluorescence staining (IF) confirmed a markedly higher CD31-positive staining area in the theca layer of SYFs than in that of SWFs. Meanwhile, the estradiol (E
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