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Genes2019; 10(10); 821; doi: 10.3390/genes10100821

Non-Coding RNA Sequencing of Equine Endometrium During Maternal Recognition of Pregnancy.

Abstract: Maternal recognition of pregnancy (MRP) in the mare is not well defined. In a non-pregnant mare, prostaglandin F (PGF) is released on day 14 post-ovulation (PO) to cause luteal regression, resulting in loss of progesterone production. Equine MRP occurs prior to day 14 to halt PGF production. Studies have failed to identify a gene candidate for MRP, so attention has turned to small, non-coding RNAs. The objective of this study was to evaluate small RNA (<200 nucleotides) content in endometrium during MRP. Mares were used in a cross-over design with each having a pregnant and non-mated cycle. Each mare was randomly assigned to collection day 11 or 13 PO ( = 3/day) and endometrial biopsies were obtained. Total RNA was isolated and sequencing libraries were prepared using a small RNA library preparation kit and sequenced on a HiSeq 2000. EquCab3 was used as the reference genome and DESeq2 was used for statistical analysis. On day 11, 419 ncRNAs, representing miRNA, snRNA, snoRNA, scaRNA, and vaultRNA, were different between pregnancy statuses, but none on day 13. Equine endometrial ncRNAs with unknown structure and function were also identified. This study is the first to describe ncRNA transcriptome in equine endometrium. Identifying targets of these ncRNAs could lead to determining MRP.
Publication Date: 2019-10-18 PubMed ID: 31635328PubMed Central: PMC6826835DOI: 10.3390/genes10100821Google Scholar: Lookup
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  • Journal Article
  • Research Support
  • Non-U.S. Gov't

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research article involves a study about maternal recognition of pregnancy (MRP) in mares, using non-coding RNAs to possibly determine pregnancy status.

Concept of Maternal Recognition of Pregnancy

  • The paper begins by explaining the concept of MRP in mares, which is yet to be fully understood. In a situation where the mare is not pregnant, prostaglandin F (PGF) is released on the 14th day following ovulation, triggering a process called luteal regression that results in ending the production of progesterone. For pregnant mares, MRP occurs before the 14th day to stop PGF production.
  • Previous studies could not identify a specific gene responsible for MRP, thus the focus of this research shifts to smaller, non-coding RNAs (ncRNAs).

Objectives and Methodology of the Study

  • The primary objective of this investigation was to assess the content of small RNA (<200 nucleotides) in the endometrium during MRP.
  • The researchers used a cross-over design, entailing both pregnant and non-mated cycles for each mare. The mares were randomized to belong to either day 11 or day 13 post-ovulation groups for endometrial biopsy collection.
  • A small RNA library preparation kit was utilized to prepare sequencing libraries from the total RNA, which were then sequenced on a HiSeq 2000.
  • The reference genome used in the research was EquCab3, with DESeq2 employed for statistical analysis.

Findings and Conclusion

  • On day 11, the researchers identified 419 ncRNAs, which represented a variety of RNA types such as miRNA, snRNA, snoRNA, scaRNA, and vaultRNA. These RNAs presented differing between pregnant and non-pregnant mares, while on day 13 there was no difference.
  • The researchers also detected equine endometrial ncRNAs with unidentified structures and functions.
  • As a first of its kind, the study described the ncRNA transcriptome within the equine endometrium.
  • The research points towards potential avenues for future studies, as identifying targets of these ncRNAs may provide valuable insights into MRP determination.

Cite This Article

APA
Klohonatz KM, Coleman SJ, Cameron AD, Hess AM, Reed KJ, Canovas A, Medrano JF, Islas-Trejo AD, Kalbfleisch T, Bouma GJ, Bruemmer JE. (2019). Non-Coding RNA Sequencing of Equine Endometrium During Maternal Recognition of Pregnancy. Genes (Basel), 10(10), 821. https://doi.org/10.3390/genes10100821

Publication

ISSN: 2073-4425
NlmUniqueID: 101551097
Country: Switzerland
Language: English
Volume: 10
Issue: 10
PII: 821

Researcher Affiliations

Klohonatz, Kristin M
  • Department of Animal Sciences, Colorado State University, Fort Collins, CO 80523, USA. kmk5057@gmail.com.
Coleman, Stephen J
  • Department of Animal Sciences, Colorado State University, Fort Collins, CO 80523, USA. stephen.coleman@colostate.edu.
Cameron, Ashley D
  • Department of Animal Sciences, Colorado State University, Fort Collins, CO 80523, USA. adcamero@gmail.com.
Hess, Ann M
  • Department of Statistics and Bioinformatics, Colorado State University, Fort Collins, CO 80523, USA. ann.hess@colostate.edu.
Reed, Kailee J
  • Department of Animal Sciences, Colorado State University, Fort Collins, CO 80523, USA. kailee.reed@colostate.edu.
Canovas, Angela
  • Department of Animal Science, University of California Davis, Davis, CA 95616, USA. acanovas@uoguelph.ca.
Medrano, Juan F
  • Department of Animal Science, University of California Davis, Davis, CA 95616, USA. jfmedrano@ucdavis.edu.
Islas-Trejo, Alma D
  • Department of Animal Science, University of California Davis, Davis, CA 95616, USA. adislas@ucdavis.edu.
Kalbfleisch, Ted
  • Department of Veterinary Science, Gluck Equine Research Center, University of Kentucky, Lexington, KY 40503, USA. ted.kalbfleisch@uky.edu.
Bouma, Gerrit J
  • Department of Biomedical Sciences, Animal Reproduction and Biotechnology Laboratory, Colorado State University, Fort Collins, CO 80523, USA. gerrit.bouma@colostate.edu.
Bruemmer, Jason E
  • Department of Animal Sciences, Colorado State University, Fort Collins, CO 80523, USA. jason.bruemmer@colostate.edu.
  • Department of Animal Sciences, 259 Animal Sciences, 1171 Campus Delivery Colorado State University, Fort Collins, CO 80523, USA. jason.bruemmer@colostate.edu.

MeSH Terms

  • Animals
  • Endometrium / metabolism
  • Female
  • Horses / genetics
  • Horses / metabolism
  • Horses / physiology
  • Pregnancy
  • Pregnancy, Animal / genetics
  • Pregnancy, Animal / metabolism
  • Pregnancy, Animal / physiology
  • RNA, Untranslated / genetics
  • RNA, Untranslated / metabolism
  • Transcriptome

Conflict of Interest Statement

The authors declare no conflict of interest.

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