title: ACSL1, AGPAT6, FABP3, LPIN1, and SLC27A6 are the most abundant isoforms in bovine mammary tissue and their expression is affected by stage of lactation.
abstract: The lactating bovine mammary gland is a formidable triacylglycerol-synthesizing machine and, as such, represents an ideal model for studying putative functions of distinct isoforms of solute carrier family 27 transporters [(SLC27A) 1, 2, 3, 5, 6], long chain acyl-CoA synthetases [(ACSL) 1, 3, 4, 5, 6], fatty acid binding proteins [(FABP) 1, 3, 4, 5, 6], 1-acylglycerol-3-phosphate O-acyltransferases [(AGPAT) 1, 2, 3, 4, 5, 6, 7, 8], and lipins [(LPIN) 1, 2, 3]. The relative percentage of mRNA abundance and fold-changes in the expression of isoforms in mammary tissue from 6 cows each at -15, 15, 60, and 240 d relative to parturition were analyzed using quantitative PCR. Transcripts of FABP isoforms were most abundant, accounting for 78% of the 28 genes measured, and SLC27A isoforms were least abundant (< 0.5% of genes measured). mRNA of AGPAT, ACSL, and LPIN accounted for approximately 12, 7, or approximately 2%, respectively, of all genes measured. The mRNA abundance at 60 d postpartum for FABP3, ACSL1, AGPAT6, and LPIN1 was 80-, 7-, 15-, and 20-fold greater relative to -15 d. Transcripts of these isoforms constituted the most abundant within each specific gene family. SLC27A2, SLC27A5, and SLC27A6 had peak expression at 240, 240, or 15 d relative to parturition, respectively. Results suggest that SLC27A6, ACSL1, FABP3, AGPAT6, and LPIN1 coordinately regulate the channeling of fatty acids toward copious milk fat synthesis in bovine mammary.
authors.affiliation: Mammalian NutriPhysioGenomics, Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana, Illinois 61801, USA.
authors.forename: Massimo
authors.initials: M
authors.lastname: Bionaz
authors.forename: Juan J
authors.initials: JJ
authors.lastname: Loor
mesh_terms: D000818:Animals; D002417:Cattle / Q000378:metabolism*; D050612:Fatty Acid Transport Proteins / Q000235:genetics* / Q000378:metabolism*; D005260:Female; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000502:physiology*; D007774:Lactation / Q000378:metabolism*; D008321:Mammary Glands, Animal / Q000378:metabolism*; D049590:Postpartum Period / Q000502:physiology; D020033:Protein Isoforms; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D013997:Time Factors
chemical_list: D050612:Fatty Acid Transport Proteins; D020033:Protein Isoforms; D012333:RNA, Messenger