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Milk fat is one of the most important economic traits in dairy animals. Yet, the biological machinery involved in milk fat synthesis remains poorly understood. In the present study, expression profiling of 45 genes involved in lipid biosynthesis and secretion was performed using a computational approach to identify those genes that are differentially expressed in mammary tissue. Transcript abundance was observed for genes associated with nine bioprocesses, namely, fatty acid import into cells, xenobiotic and cholesterol transport, acetate and fatty acid activation and intracellular transport, fatty acid synthesis and desaturation, triacylglycerol synthesis, sphingolipid synthesis, lipid droplet formation, ketone body utilization, and regulation of transcription in mammary, skin, and muscle tissue. Relative expression coefficient of the genes was derived based on the transcript abundance across the three tissue types to determine the genes that were preferentially expressed during lactation. 13 genes ( ACSS1 ,  ACSS2 ,  ADFP ,  CD36 ,  FABP3 ,  FASN ,  GPAM ,  INSIG1 ,  LPL ,  SCD5 ,  SPTLC1 ,  SREBF1,  and  XDH ) showed higher expression in the mammary tissue of which 6 ( ADFP ,  FASN ,  GPAM ,  LPL ,  SREBF1,  and  XDH ) showed higher expression during adulthood. Further, interaction networks were mapped for these genes to determine the nature of interactions and to identify the major genes in the milk fat biosynthesis and secretion pathways.

Electronic Northern Analysis of Genes and Modeling of Gene Networks Underlying Bovine Milk Fat Production