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Transcriptomic Study of Testicular Hypoxia Adaptation in Tibetan Sheep
Binyan Yu1, Yanan Yang1, Yijian Li1
1College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, Gansu, China.
Reproduction in Domestic Animals = Zuchthygiene
|March 18, 2025
Summary
Tibetan sheep possess genetic mechanisms for adapting to high-altitude, hypoxic environments. This study identified key genes and pathways in testicular tissue crucial for plateau adaptability and reproductive health in sheep.
Area of Science:
- Genomics
- Physiology
- Animal Science
Background:
- Tibetan sheep are mammals adapted to high-altitude hypoxic environments (2500–5000m).
- Understanding their hypoxic adaptation mechanisms offers insights for other species.
- Testicular tissue is a key site for studying adaptation to altitude.
Purpose of the Study:
- To investigate the genetic mechanisms of hypoxic adaptation in Tibetan sheep testicular tissue at the transcriptional level.
- To identify candidate genes and critical pathways involved in sheep adaptation to plateau environments.
- To compare gene expression between high-altitude (ZYH) and low-altitude (ZYM) Tibetan sheep.
Main Methods:
- Histological observation of testicular tissues using hematoxylin-eosin (HE) staining.
- RNA sequencing (RNA-Seq) technology to identify differentially expressed genes (DEGs).
- Functional enrichment analysis of identified genes and pathways.
Main Results:
- 103 differentially expressed genes (DEGs) were identified: 50 up-regulated and 53 down-regulated in high-altitude Tibetan sheep.
- Functional analyses highlighted pathways related to testicular adaptation to plateau conditions.
- Specific genes (e.g., GGT5, AGTR2, EDN1) were enriched in pathways impacting reproductive activity, sexual maturation, and protection of germ cells.
Conclusions:
- The study provides a molecular understanding of sheep adaptation to high-altitude environments.
- Identified genes and pathways are crucial for maintaining testicular function and reproductive success under hypoxia.
- Findings contribute to understanding the genetic basis of hypoxia tolerance in plateau mammals.
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