Evidence map›Paper›PMID 34031767›Full record

ArticleJournal of assisted reproduction and genetics2021

Effect of oxygen and glucose availability during in vitro maturation of bovine oocytes on development and gene expression.

Annie Whitty, Karen L Kind, Kylie R Dunning, Jeremy G Thompson

Open access · greenAbstract read
In one paragraph

Article in Journal of assisted reproduction and genetics, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.

0numbers the graph read from it
0cells of the map it votes in
12citing papers in PubMed
2.4field-weighted citation impact, top 12% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

12 citing papers in PubMed, 17 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 2 institutions in 1 country.

Annie WhittyRobinson Research Institute, Adelaide Medical School, The University of Adelaide, Adelaide, South Australia, Australia.ORCID https://orcid.org/0000-0002-7204-9319
Karen L KindSchool of Animal and Veterinary Sciences, The University of Adelaide, Adelaide, South Australia, Australia.ORCID https://orcid.org/0000-0002-4674-9207
Kylie R DunningRobinson Research Institute, Adelaide Medical School, The University of Adelaide, Adelaide, South Australia, Australia. kylie.dunning@adelaide.edu.au.ORCID http://orcid.org/0000-0002-0462-6479
Jeremy G ThompsonRobinson Research Institute, Adelaide Medical School, The University of Adelaide, Adelaide, South Australia, Australia.ORCID https://orcid.org/0000-0003-4941-7731
The University of Adelaide · AUAustralian Research Council · AU

Funding

Centre for Nanoscale Biophotonics CE140100003Hospital Research Foundation C-MCF-58-2019National Health and Medical Research Council 1077694
6 · The paper itself

Abstract

purposeOxygen tension during the in vitro maturation (IVM) of oocytes is important for oocyte developmental competence. A conflict exists in the literature as to whether low oxygen during IVM is detrimental or beneficial to the oocyte. Many research and clinical labs use higher than physiological oxygen tension perhaps believing that low-oxygen tension is detrimental to oocyte development. Other studies show that glucose is important if low-oxygen tension is used during maturation. In this study, we look at the link between low oxygen and glucose availability during IVM to resolve misconceptions around low-oxygen tension during IVM.

methodsBovine cumulus oocyte complexes (COCs) were matured at 20% vs 7% oxygen in media containing differing glucose concentrations or varying availability. Cleavage and blastocyst rates were recorded. RT-PCR determined expression levels of metabolic, oxygen, and stress-responsive genes following IVM.

resultsEmbryo development in 7% oxygen groups with 2.3mM glucose/low glucose availability was lower than 20% oxygen groups. Under 7% oxygen with 5.6mM glucose or higher glucose availability, rates were restored to those seen in 20% oxygen. Expressions of BNIP3, ENO1, GAPDH, and SLC2A1, were upregulated in 7% oxygen/low glucose, compared to 20% oxygen groups. BNIP3 expression was higher in 7% oxygen group with low glucose availability compared to the 20% groups.

conclusionOocyte developmental competence is negatively impacted following IVM in low oxygen when glucose availability is limited. Glucose concentration and physical culture conditions need to be considered when comparing the effects of different oxygen concentrations during IVM.

Indexed as

In Vitro Oocyte Maturation TechniquesAnimalsBlastocystCattleCumulus CellsEmbryonic DevelopmentFemaleGene Expression Regulation, DevelopmentalGlucoseMeiosisOocytesOogenesisOxygenGlucoseOxygenBNIP3BovineCumulus oocyte complexENO1GAPDHGlucoseIn vitro maturationOocyteOxygenSLC2A1

Identifiers

PMID34031767
PMCPMC8266925
OpenAlexW3164910852

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.