Transcriptomic sequencing and differential analysis of Kazakh horse muscles from various anatomical locations.
Authors: Wubulikasimu Mierkadina, Liu Jiahao, Yao Xinkui, Meng Jun, Wang Jianwen, Zeng Yaqi, Li Linling, Ren Wanlu
Journal: Frontiers in veterinary science
Summary
# Editorial Summary: Muscle Gene Expression Profiles in Kazakh Horses Kazakh horses, valued across Central Asia for their hardiness and dual-purpose utility, display distinct physiological adaptations that warrant investigation at the molecular level—yet little has been known about how gene expression varies across different muscle tissues in this breed. Researchers used transcriptomic sequencing to profile three functionally distinct muscles: the longissimus dorsi (back), external oblique (abdominal wall), and diaphragm, then cross-referenced their findings with quantitative PCR validation. Substantial transcriptomic variation emerged between tissues, with 426 differentially expressed genes (DEGs) identified between back and abdominal muscles, rising to 1,762 DEGs when comparing abdominal and diaphragm tissues; genes including TPM1, TNNI2, ACTN3, and MYH8—key regulators of skeletal muscle structure and contractile function—showed particularly marked differences. Enrichment analysis revealed that these DEGs cluster within pathways governing muscle development, cytoskeletal organisation, and motor protein dynamics, suggesting that anatomical location profoundly influences muscle phenotype and metabolic capacity. For equine professionals, these findings provide a foundational reference for understanding breed-specific muscle physiology and offer potential genetic markers for selective breeding programmes aimed at optimising meat quality and production efficiency in horses.
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Practical Takeaways
- •Understanding gene expression differences across muscle types may inform breeding strategies for improving meat production and muscle development in horses
- •Different muscle anatomical locations have distinct molecular profiles that reflect their functional roles (postural vs. locomotor vs. respiratory)
- •This foundational genomic data could help identify genetic markers for desirable muscle growth traits in equine breeding programs
Key Findings
- •426 differentially expressed genes (DEGs) identified between longissimus dorsi and external oblique muscles, including TPM1, TNNI2, and ACTN3
- •1,762 DEGs detected between external oblique and diaphragm muscles with 1,391 upregulated genes, suggesting substantial functional differentiation
- •Key enriched pathways include skeletal muscle growth, cytoskeleton organization, and motor protein function across muscle regions
- •Transcriptomic differences provide molecular basis for anatomical and functional variation in equine skeletal muscle tissues