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dc.contributor.authorMiltiadou Den
dc.contributor.authorHager-Theodorides ALen
dc.contributor.authorSymeou Sen
dc.contributor.authorConstantinou Cen
dc.contributor.authorPsifidi Aen
dc.contributor.authorBanos Gen
dc.contributor.authorTzamaloukas Oen
dc.date.accessioned2017-05-09T15:54:40Z
dc.date.available2017-05-09T15:54:40Z
dc.date.issued2017
dc.identifier.citation100:8
dc.identifier.issn0022-0302
dc.identifier.urihttp://hdl.handle.net/11262/11235
dc.identifier.urihttps://doi.org/10.3168/jds.2016-12326
dc.description.abstractThe acetyl-CoA acyltransferase 2 (ACAA2) gene encodes an enzyme of the thiolase family that is involved in mitochondrial fatty acid elongation and degradation by catalyzing the last step of the respective β-oxidation pathway. The increased energy needs for gluconeogenesis and triglyceride synthesis during lactation are met primarily by increased fatty acid oxidation. Therefore, the ACAA2 enzyme plays an important role in the supply of energy and carbon substrates for lactation and may thus affect milk production traits. This study investigated the association of the ACAA2 gene with important sheep traits and the putative functional involvement of this gene in dairy traits. A single nucleotide substitution, a T to C transition located in the 3′ untranslated region of the ACAA2 gene, was used in mixed model association analysis with milk yield, milk protein yield and percentage, milk fat yield and percentage, and litter size at birth. The single nucleotide polymorphism was significantly associated with total lactation production and milk protein percentage, with respective additive effects of 6.81 ± 2.95 kg and −0.05 ± 0.02%. Additionally, a significant dominance effect of 0.46 ± 0.21 kg was detected for milk fat yield. Homozygous TT and heterozygous CT animals exhibited higher milk yield compared with homozygous CC animals, whereas the latter exhibited increased milk protein percentage. Expression analysis from age-, lactation-, and parity-matched female sheep showed that mRNA expression of the ACAA2 gene from TT animals was 2.8- and 11.8-fold higher in liver and mammary gland, respectively. In addition, by developing an allelic expression imbalance assay, it was estimated that the T allele was expressed at an average of 18% more compared with the C allele in the udder of randomly selected ewes. We demonstrated for the first time that the variants in the 3′ untranslated region of the ovine ACAA2 gene are differentially expressed in homozygous ewes of each allele and exhibit allelic expression imbalance within heterozygotes in a tissue-specific manner, supporting the existence of cis-regulatory DNA variation in the ovine ACAA2 gene. This is the first study reporting differential allelic imbalance expression of a candidate gene associated with milk production traits in dairy sheep
dc.description.sponsorshipScottish Government RESAS Strategic Research Programme (RD 2.3.2 SD2)en
dc.description.sponsorshipBBSRC BB/J004235/1
dc.language.isoenen
dc.relation.isformatof14597en
dc.relation.ispartofJournal of Dairy Scienceen
dc.rightsCopyright © 2017, The Authors. Published by FASS and Elsevier Inc. on behalf of the American Dairy Science Association ®. This is an open access article under the CC BY-NC-ND license
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/
dc.subjectACAA2 associationen
dc.subject3'UTR Cis-acting SNPen
dc.subjectGene expressionen
dc.subjectDairy sheepen
dc.titleVariants in the 3'UTR of the ovine Acetyl-Coenzyme A Acyltranferase 2 gene are associated with dairy traits and exhibit differential allelic expressionen
dc.typeArticleen
dc.description.versionVersion of record
dc.extent.pageNumbers6285-6297
rioxxterms.publicationdate2017-06-16
rioxxterms.typeJournal Article/Reviewen
dcterms.dateAccepted2017-04-23
refterms.accessExceptionNAen
refterms.dateDeposit2017-05-09
refterms.dateFCD2017-07-18
refterms.depositExceptionNAen
refterms.panelUnspecifieden
refterms.technicalExceptionNAen
refterms.versionAMen


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Copyright © 2017, The Authors. Published by FASS and Elsevier
Inc. on behalf of the American Dairy Science Association ®.
This is an open access article under the CC BY-NC-ND license
Except where otherwise noted, this item's license is described as Copyright © 2017, The Authors. Published by FASS and Elsevier Inc. on behalf of the American Dairy Science Association ®. This is an open access article under the CC BY-NC-ND license