Transcriptome analysis reveals intestinal gene expression and metabolic pathways in yaks

Area of Science:

• * Physiology and Molecular Biology
• * Animal Adaptation and Genomics

Background:

• * Yaks (Bos grunniens) are ruminants native to high-altitude plateaus, facing extreme conditions like hypoxia and low temperatures.
• * Their unique physiological adaptations make them a valuable model for studying survival in harsh environments.
• * The intestine, a key metabolic organ, plays a critical role in adaptation.

Purpose of the Study:

• * To compare transcriptional regulatory mechanisms in yak and cattle intestines.
• * To elucidate the metabolic basis of yak high-altitude adaptation.
• * To identify key genes and pathways involved in intestinal function.

Main Methods:

• * Systematic comparison of gene expression in yak and cattle small and large intestines.
• * Analysis of transcriptional regulatory mechanisms.
• * Focus on key metabolic and transport genes.

Main Results:

• * Upregulated expression of tryptophan metabolism (IDO1, KYNU), lipid metabolism (ACSL1), and vitamin transport (ABCG2) genes in the yak small intestine.
• * Enhanced nutrient metabolism and barrier function potential in the yak small intestine.
• * Upregulated expression of lipid metabolism (PLA2), detoxification (UGT), cAMP signaling (ADCY, CREB3L), and bile secretion (ABCC) genes in the yak large intestine.
• * Unique yak advantages in energy regulation and intestinal homeostasis.

Conclusions:

• * Yak intestines possess specialized metabolic and homeostatic mechanisms for high-altitude adaptation.
• * Upregulated genes highlight enhanced nutrient processing, energy regulation, and barrier function.
• * Findings provide a foundation for understanding ruminant intestinal function and molecular breeding.