L-Carnitine sustainably affects bioenergetic profile of bovine blastocysts and transcriptome profile of elongation-stage embryos

in Reproduction
Authors:
Eva Held-Hoelker Institute of Animal Sciences, Animal Breeding and Husbandry group, Rheinische Friedrich-Wilhelms-Universitat Bonn, Endenicher Allee, Bonn, Germany
Department of Animal Science, Biotechnology and Reproduction of Farm Animals, Georg-August-University Goettingen, Burckhardtweg, Göttingen, Germany.

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https://orcid.org/0009-0006-4732-9550
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Jessica Kurzella Institute of Animal Sciences, Animal Breeding and Husbandry group, Rheinische Friedrich-Wilhelms-Universitat Bonn, Endenicher Allee, Bonn, Germany

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Dessie Salilew-Wondim Institute of Animal Sciences, Animal Breeding and Husbandry group, Rheinische Friedrich-Wilhelms-Universitat Bonn, Endenicher Allee, Bonn, Germany
Department of Animal Science, Biotechnology and Reproduction of Farm Animals, Georg-August-University Goettingen, Burckhardtweg, Göttingen, Germany.

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Franca Rings Institute of Animal Sciences, Animal Breeding and Husbandry group, Rheinische Friedrich-Wilhelms-Universitat Bonn, Endenicher Allee, Bonn, Germany

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Dawit Tesfaye Department of Biomedical Sciences, Animal Reproduction and Biotechnology Laboratory, Colorado State University, Fort Collins, USA

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Ernst Tholen Institute of Animal Sciences, Animal Breeding and Husbandry group, Rheinische Friedrich-Wilhelms-Universitat Bonn, Endenicher Allee, Bonn, Germany

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Christine Grosse-Brinkhaus Institute of Animal Sciences, Animal Breeding and Husbandry group, Rheinische Friedrich-Wilhelms-Universitat Bonn, Endenicher Allee, Bonn, Germany

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Michael Hoelker Department of Animal Science, Biotechnology and Reproduction of Farm Animals, Georg-August-University Goettingen, Burckhardtweg, Göttingen, Germany.

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Correspondence should be addressed to E Held-Hoelker; Email: ehel@itw.uni-bonn.de
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In brief

In the present study the sustainable effect of L-carnitine during the culture period on the post-transfer development was investigated. Taken together, we uncovered direct effects of L-carnitine on the bioenergetic profile of day 7 blastocysts along with sustainable effects on mtDNA copy numbers and transcriptome profile of bovine day 14 embryos.

Abstract

L-Carnitine (LC) is known to play key roles in lipid metabolism and antioxidative activity, implicating enhanced cryotolerance of bovine blastocysts. However, sustainability of LC supplementation during culture period on preimplantation development beyond the blastocyst stage has not been investigated so far. Therefore, all embryos were cultured under fatty acid-free conditions, one group with LC (LC embryos) and the control group without LC (control) supplementation. Transfer to recipients was conducted on day 6. Elongation-stage embryos were recovered on day 14; metrics of embryo recollection, developmental rates as regards early elongation-stage as well as mean embryo length did not differ between the groups. Gene expression analyses via NGS revealed 341 genes to be differentially regulated between elongation-stage embryos derived from LC supplementation compared to controls. These played mainly a role in molecular functions and biological processes like oxidoreductase activity, ATP-dependent activity, cellular stress, and respiration. Pathways like oxidative phosphorylation and thermogenesis, extracellular matrix receptor signaling, PI3K-Akt, and focal adhesion were affected by differentially regulated genes. Moreover, all DEGs located on the mitochondria were significantly downregulated in LC embryos, being in line with lower mitochondrial copy number and mtDNA integrity compared to the control group. Finally, we uncovered alterations of the bioenergetic profile on day 7 as a consequence of LC supplementation for the first time, revealing significantly higher oxygen consumption rates, ATP linked respiration and spare capacity for LC embryos. In summary, we uncovered direct effects of LC supplementation during the culture period on the bioenergetic profile along with sustainable effects on mtDNA copy numbers and transcriptome profile of bovine day 14 embryos.

 

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