Research Output per year
The objective of this study was to analyze the mammary gland transcriptome to determine how preweaning nutrient supply alters the molecular mechanisms that regulate preweaning mammary development. Holstein heifers were fed via milk replacer either an elevated level of nutrient intake (ELE; on average, 5.9 ± 0.2 Mcal ME in 8.4 L of milk replacer (MR)/d, n = 6) or a restricted amount of nutrients (RES; 2.8 ± 0.2 Mcal ME in 4L MR/day, n = 5) for 54 d postnatal, at which point they were slaughtered and samples of mammary parenchyma tissue were obtained. Parenchymal mRNA was analyzed and the fold changes (FC) of 18,111 genes (ELE relative to RES) were uploaded to Ingenuity Pathway Analysis (IPA) software for transcriptomic analysis. Using a threshold of P < 0.05, IPA identified that the FC of 1,931 of 18,811 differentially expressed genes (DEG) could be utilized for the analysis. A total 18 molecular and cellular functions were relevant (P < 0.05) to DE genes arising from the treatments, with Cell Death and Survival, Cellular Movement, Cellular Development, Cellular Growth and Proliferation, and Lipid Metabolism being the 5 most associated functions with DEG. Based on the directional FC of DEG, the mammary gland of ELE heifers was predicted to have increased Epithelial-Mesenchymal Transition (Z = 2.685) and Accumulation of Lipid (Z = 2.322), while the Synthesis of DNA (Z = -2.137), Transactivation of RNA (Z = -2.254), Expression of RNA (Z = -2.405), Transcription (Z = -2.482) and Transactivation (Z = -2.611) were all predicted to be decreased. Additionally, IPA predicted the activation status of 13 upstream regulators with direct influence on DEG as affected by ELE feeding that were either ligand-dependent nuclear receptors (n = 2), enzyme (n = 1), or transcription regulators (n = 10). Of these, 6 were activated (Z > 2) and 7 were inhibited (Z < -2). In summary, feeding ELE preweaning altered the mammary transcriptome of Holstein heifers affecting cell functions involved in the morphological and physiological development of the mammary gland
|Date made available||21 Sep 2019|
|Publisher||Wageningen University & Research|
Preweaning nutrient supply alters mammary gland transcriptome expression relating to morphology, lipid accumulation, DNA synthesis, and RNA expression in Holstein heifer calvesHare, K. S., Leal, L. N., Romao, J. M., Hooiveld, G. J., Soberon, F., Berends, H., Van Amburgh, M. E., Martín-Tereso, J. & Steele, M. A., Mar 2019, In : Journal of Dairy Science. 102, 3, p. 2618-2630
Research output: Contribution to journal › Article › Academic › peer-review
Hare, K. S. (Creator), Leal, L. N. (Creator), Romao, J. M. (Creator), Hooiveld, G. J. E. J. (Creator), Soberon, F. (Creator), Berends, H. (Creator), Van Amburgh, M. E. (Creator), Martín-Tereso, J. (Creator), Steele, M. A. (Creator) (21 Sep 2019). Preweaning nutrient supply alters mammary gland transcriptome expression relating to morphology, lipid accumulation, DNA synthesis and RNA expression in Holstein heifer calves. Wageningen University & Research.