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Biblioteca(s): | INIA La Estanzuela.
Fecha corriente: | 08/06/2021
Fecha de la última actualización: | 02/09/2022
Autoria: | GASTAL, G.D.A.; SCARLET D.; MELCHERT M.; ERTL R.; AURICH, C.
Afiliación: | GUSTAVO DESIRE ANTUNES GASTAL, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay./ Center for Artificial Insemination and Embryo Transfer, Department for Small Animals and Horses, University of Veterinary Medicine Vienna, 1210 Vienna, Austria.; DRAGOS SCARLET, Division of Obstetrics, Gynecology and Andrology, Department for Small Animals and Horses, University of Veterinary Medicine Vienna, 1210 Vienna, Austria;; MARIA MELCHERT, Center for Artificial Insemination and Embryo Transfer, Department for Small Animals and Horses, University of Veterinary Medicine Vienna, 1210 Vienna, Austria.; REINHARD ERT, Vetcore Facility, University of Veterinary Medicine Vienna, 1210 Vienna, Austria.; CHRISTINE AURICH, Center for Artificial Insemination and Embryo Transfer, Department for Small Animals and Horses, University of Veterinary Medicine Vienna, 1210 Vienna, Austria.
Título: | Epigenetic changes in equine embryos after short-term storage at different temperaturas.
Año de publicación: | 2021
Fuente/Imprenta: | Animals, 5 May 2021, Volume 11, Issue 5, Article number 1325. Open Access. Doi: https://doi.org/10.3390/ani11051325
DOI: | 10.3390/ani11051325
Idioma: | Inglés
Notas: | Article history: Received: 16 March 2021/Accepted: 3 May 2021/Published: 6 May 2021. This work was supported by University of Veterinary Medicine Vienna, Austria.

Contenido:

Simple Summary: In embryos subjected to assisted reproductive techniques, epigenetic modifications may occur that can influence embryonic development and establishment of pregnancy. In horses, the storage temperature during transport of fresh embryos before transfer is a major concern.
The aim of this study was, therefore, to determine the effects of two storage temperatures (5 ?C and 20 ?C) on equine embryos, collected at day seven after ovulation and stored for 24 h, concerning morphological development, expression of candidate genes associated with embryo growth and
development, maternal recognition of pregnancy, methylation, apoptosis and gene-specific and global DNA methylation. Temperature during storage did not affect embryo size. There were no changes in pH and lipid peroxidation of the medium irrespective of group. mRNA expression and gene-specific DNA methylation of genes related to growth and development, maternal recognition of pregnancy, DNA methylation and apoptosis in stored embryos (5 ?C and 20 ?C) were altered when compared to fresh embryos. Therefore, our study demonstrates for the first time the gene-specific and global DNA methylation status of fresh equine embryos collected on days seven and eight after ovulation. Short-term storage, regardless of temperature, may compromise embryo development after transfer.
Abstract: In embryos subjected to assisted reproductive techniques, epigenetic modifications may occur that can influence embryonic development and the establishment of pregnancy. In horses, the storage temperature during transport of fresh embryos before transfer is a major concern. The aim
of this study was, therefore, to determine the effects of two storage temperatures (5 ?C and 20 ?C) on equine embryos, collected at day seven after ovulation and stored for 24 h, on: (i) morphological development; (ii) expression of candidate genes associated with embryo growth and development,
maternal recognition of pregnancy, methylation and apoptosis, and (iii) gene-specific and global DNA methylation. Embryos (n = 80) were collected on day seven or day eight after ovulation and assigned to four groups: day seven control (E7F, fresh); day seven, stored for 24 h at 5 ?C (E5C);
day seven, stored for 24 h at 20 ?C (E20C) and day eight control (E8F, fresh 24h time control). The embryos and the storage medium (EquiHold, holding medium, Minitube, Tiefenbach, Germany) from all treatment groups were analyzed for (i) medium temperature, pH, and lipid peroxidation
(malondialdehyde; MDA) and (ii) embryo morphology, mRNA expression and DNA methylation (immunohistochemistry and gene-specific DNA methylation). The size of embryos stored at 5 ?C was larger (p < 0.01), whereas embryos stored at 20 ?C were smaller (p < 0.05) after 24 h. There
were no changes in pH and MDA accumulation irrespective of the group. The mRNA expression of specific genes related to growth and development (POU5F1, SOX2, NANOG), maternal recognition of pregnancy (CYP19A1, PTGES2), DNA methylation (DNMT1, DNMT3A, DNMT3B) and apoptosis
(BAX) in the E5C and E20C were either up or downregulated (p < 0.05) when compared to controls (E7F and E8F). The immune expression of 5mC and 5hmC was similar among treatment groups. Percentage of methylation in the CpG islands was lower in the specific genes ESR1, NANOG and
DNMT1 (p < 0.001) in E20C embryos when compared to E8F (advanced embryo stage). Therefore,our study demonstrates for the first time the gene-specific and global DNA methylation status of fresh equine embryos collected on days seven and eight after ovulation. Although our results suggest
some beneficial effects of storage at 20 ?C in comparison to 5 ?C, the short-term storage, regardless of temperature, modified gene expression and methylation of genes involved in embryo development and may compromise embryo viability and development after transfer.

Palabras-Clave: | Development; Embryo; Embryo-maternal recognition; Equine; Methylation; PLATAFORMA DE INVESTIGACIÓN EN SALUD ANIMAL; PLATAFORMA DE SALUD ANIMAL; Transport.
Thesagro: | EQUINOS.
Categoría del tema: | --

URL:

http://www.ainfo.inia.uy/digital/bitstream/item/16671/1/animals-11-01325.pdf
https://www.mdpi.com/2076-2615/11/5/1325/pdf

Registro original: | INIA La Estanzuela (LE)
Ejemplares: | LE - (103381-1) - PXI - AP - DD - PP/Animals/2021 -  -  - DIS