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Author Spotlight: Improving Beef Cattle Nutrition and Production with a Focus on Feed Efficiency and Meat Quality Traits Through Advanced Biochemical and Molecular Assays
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Longitudinal muscle gene expression patterns associated with differential intramuscular fat in cattle.

N J Hudson1, A Reverter1, P L Greenwood2

  • 11Computational and Systems Biology,CSIRO Agriculture Flagship,306 Carmody Road,St Lucia,Brisbane,QLD 4067,Australia.

Animal : an International Journal of Animal Bioscience
|November 14, 2014
PubMed
Summary

Identifying early gene expression markers can predict an animal's potential for intramuscular fat (IMF) deposition, crucial for meat quality. Genes like WISP2, RAI14, and CYP4F2 show promise as early indicators of marbling ability.

Keywords:
adipocyte

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Area of Science:

  • Animal Science
  • Genetics
  • Biochemistry

Background:

  • Intramuscular fat (IMF) significantly influences meat quality traits like flavor and juiciness.
  • High IMF content, or marbling, is associated with premium meat prices, but predicting marbling potential is challenging due to unknown biological mechanisms.
  • Current gene expression studies often focus on late-stage fat metabolism, missing early developmental markers.

Purpose of the Study:

  • To identify early gene expression markers that predict an animal's predisposition to high intramuscular fat (IMF) deposition.
  • To contrast gene expression profiles between high-IMF Wagyu cross and low-IMF Piedmontese cross animals at various developmental stages.
  • To explore the relationship between IMF development, connective tissue remodeling, and gene expression patterns.

Main Methods:

  • Comparative analysis of longissimus dorsi (LD) muscle gene expression in Wagyu and Piedmontese crossbred cattle at different time points.
  • Focus on identifying divergent gene expression patterns between breeds, particularly in early postnatal development.
  • Utilized regulatory impact factor analysis to identify potential causal effector molecules involved in marbling.

Main Results:

  • Key fat metabolism genes (FABP4, THRSP, CIDEC, ACACA) showed divergence late in development (around 20 months).
  • Genes WISP2, RAI14, and CYP4F2 exhibited divergent expression by 12 months, suggesting potential as early predictors.
  • WISP2 was upregulated in high-marbling Wagyu early on, linked to inhibiting connective tissue growth.
  • RAI14 expression increased with age and was consistently higher in Wagyu.
  • CYP4F2 was upregulated in Piedmontese, suggesting Wagyu adiposity might be pro-inflammatory.

Conclusions:

  • WISP2, RAI14, and CYP4F2 represent potential early biomarkers for predicting marbling potential in cattle.
  • Early identification of these markers could reduce costs associated with traditional feedlotting for IMF enhancement.
  • Network analysis implicated transcription factors involved in adipogenesis, inflammation, and liposarcoma formation in marbling.
  • Understanding these genetic underpinnings can aid in developing strategies for improving meat quality through selective breeding.