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Related Concept Videos

Spermatogenesis01:41

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...
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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...
RNA-seq03:21

RNA-seq

RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases. 
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...
Spermatogenesis01:22

Spermatogenesis

Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
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Updated: May 12, 2026

RNA-Seq Analysis of Differential Gene Expression in Electroporated Chick Embryonic Spinal Cord
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Single-cell RNA sequencing uncovers dynamic roadmap during chicken spermatogenesis.

Haishan Guo1,2, Jianing Liu1,2, Mingzhen Xu1,2

  • 1The Shennong Laboratory, Henan Agricultural University, Zhengzhou, 450046, China.

BMC Genomics
|August 13, 2025
PubMed
Summary

This study maps avian testicular development using single-cell RNA sequencing, revealing early meiosis initiation and age-related microenvironment changes in chickens. It provides a foundation for avian reproductive biology research.

Keywords:
ChickenSingle cell transcriptomeSpermatogenesisTestis

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Area of Science:

  • Reproductive Biology
  • Genomics
  • Avian Science

Background:

  • Spermatogenesis is crucial for paternal genetic transmission, regulated by the testicular microenvironment.
  • Mammalian studies offer limited insights into avian reproductive strategies due to evolutionary differences.

Purpose of the Study:

  • To create a comprehensive single-cell transcriptomic atlas of chicken testicular development.
  • To elucidate dynamic gene expression changes during spermatogenesis in roosters.
  • To understand age-related adaptations in the avian testicular microenvironment.

Main Methods:

  • Single-cell RNA sequencing (scRNA-seq) was performed on rooster testes across five developmental stages.
  • Transcriptomic data was analyzed to identify somatic and germ cell subtypes.
  • Gene expression patterns were mapped to understand cell fate transitions and microenvironmental dynamics.

Main Results:

  • Ten somatic and four germ cell subtypes were identified, detailing gene expression dynamics during spermatogenesis.
  • Meiosis initiates early in chickens, with blood-testis barrier formation linked to pachytene spermatocytes.
  • The testicular microenvironment shows age-related adaptive changes; macrophages and T cells are vital for early testicular cord and vascular network formation.

Conclusions:

  • A detailed atlas of chicken testicular development was generated, outlining cell fate transitions from stem cells to mature sperm.
  • Dynamic developmental trajectories of somatic cells within the testicular microenvironment were elucidated.
  • Findings provide novel insights into avian testicular development, supporting future reproductive biology and breeding strategies.