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Reproduction, Fertility and Development Reproduction, Fertility and Development Society
Vertebrate reproductive science and technology
RESEARCH ARTICLE

Cell type-specific endometrial transcriptome changes during initial recognition of pregnancy in the mare

Iside Scaravaggi A B , Nicole Borel C , Rebekka Romer A , Isabel Imboden A , Susanne E. Ulbrich B , Shuqin Zeng A B , Heinrich Bollwein A and Stefan Bauersachs orcid.org/0000-0003-2450-1216 A B D
+ Author Affiliations
- Author Affiliations

A Clinic of Reproductive Medicine, Department for Farm Animals, University of Zurich, Winterthurerstrasse 260, 8057 Zurich, Switzerland.

B Animal Physiology, Institute of Agricultural Sciences, ETH Zurich, Universitätstrasse 2, 8092 Zurich, Switzerland.

C Institute of Veterinary Pathology, University of Zurich, Winterthurerstrasse 260, 8057 Zurich, Switzerland.

D Corresponding author. Email: stefan.bauersachs@uzh.ch

Reproduction, Fertility and Development 31(3) 496-508 https://doi.org/10.1071/RD18144
Submitted: 17 April 2018  Accepted: 27 August 2018   Published: 26 September 2018

Abstract

Previous endometrial gene expression studies during the time of conceptus migration did not provide final conclusions on the mechanisms of maternal recognition of pregnancy (MRP) in the mare. This called for a cell type-specific endometrial gene expression analysis in response to embryo signals to improve the understanding of gene expression regulation in the context of MRP. Laser capture microdissection was used to collect luminal epithelium (LE), glandular epithelium and stroma from endometrial biopsies from Day 12 of pregnancy and Day 12 of the oestrous cycle. RNA sequencing (RNA-Seq) showed greater expression differences between cell types than between pregnant and cyclic states; differences between the pregnant and cyclic states were mainly found in LE. Comparison with a previous RNA-Seq dataset for whole biopsy samples revealed the specific origin of gene expression differences. Furthermore, genes specifically differentially expressed (DE) in one cell type were found that were not detectable as DE in biopsies. Overall, this study revealed spatial information about endometrial gene expression during the phase of initial MRP. The conceptus induced changes in the expression of genes involved in blood vessel development, specific spatial regulation of the immune system, growth factors, regulation of prostaglandin synthesis, transport prostaglandin receptors, specifically prostaglandin F receptor (PTGFR) in the context of prevention of luteolysis.

Additional keywords: Equus caballus, laser capture microdissection, maternal recognition of pregnancy, RNA-seq, uterus.


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