Transcriptional background of beef marbling - novel genes implicated in intramuscular fat deposition.
The purpose of this study was to identify novel marbling-related genes by comparison of the global gene expression in semitendinosus muscle of 15-month-old Limousin (LIM), Holstein-Friesian (HF) and Hereford (HER) bulls. Muscle of LIM was lean with low intramuscular fat (IMF) content (0.53%) unlike the marbled muscles of HER and HF characterized by higher amounts of IMF (1.10 and 0.81%, respectively). The comparison of muscle transcriptional profile between marbled and lean beef revealed significant differences in expression of 144 genes, presumably involved in consecutive stages of adipose tissue development, such as preadipocyte proliferation and differentiation, adipocyte maturation, lipid filling and lipid metabolism leading to increased IMF deposition and marbling development. Correlation coefficients and regression analysis for nine of them (gadd45a, pias3, ccrn4l, diras3, pou5f1, hoxa9, atp2a2 and pim1) validated by real-time qPCR confirmed their moderate-high correlation with IMF% and explained up to 70.5% of the total variability in IMF deposition in the bulls.
Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences - SGGW, Warsaw, Poland. Electronic address: tomasz_sadkowski@sggw.pl.
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Sadkowski
Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences - SGGW, Warsaw, Poland.
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Ciecierska
Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences - SGGW, Warsaw, Poland.
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Majewska
Institute of Genetics and Animal Breeding, Polish Academy of Sciences, Jastrzębiec, Poland.
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Oprządek
Department of Food Technology, Faculty of Food Sciences, Warsaw University of Life Sciences - SGGW, Warsaw, Poland.
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Dasiewicz
Department of Experimental Design and Bioinformatics, Warsaw University of Life Sciences - SGGW, Warsaw, Poland.
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Ollik
Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences - SGGW, Warsaw, Poland.
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Wicik
Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences - SGGW, Warsaw, Poland.
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Motyl
D017667:Adipocytes / Q000378:metabolism; D050156:Adipogenesis / Q000235:genetics*; D000273:Adipose Tissue / Q000378:metabolism; D000818:Animals; D002417:Cattle; D002454:Cell Differentiation / Q000235:genetics; D049109:Cell Proliferation; D015870:Gene Expression; D050356:Lipid Metabolism / Q000235:genetics; D008297:Male; D008460:Meat / Q000032:analysis*; D018482:Muscle, Skeletal / Q000737:chemistry; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D060888:Real-Time Polymerase Chain Reaction; D015203:Reproducibility of Results
D012333:RNA, Messenger
Cattle; Hereford; Holstein-Friesian; Intramuscular fat; Limousin; Marbling