Evidence map›Paper›PMID 33797841›Full record

ArticleAging cell2021

Epigenetic clock and methylation study of oocytes from a bovine model of reproductive aging.

Paweł Kordowitzki, Amin Haghani, Joseph A Zoller, Caesar Z Li, Ken Raj, Matthew L Spangler, Steve Horvath

Open access · goldAbstract read
In one paragraph

Article in Aging cell, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 34 papers.

0numbers the graph read from it
0cells of the map it votes in
34citing papers in PubMed
2.4field-weighted citation impact, top 10% 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

34 citing papers in PubMed, 41 citations in OpenAlex.

  1. Article
  2. Review
  3. Review
  4. Emerging opportunities for DNA methylation biomarkers in cattle improvement.The Journal of reproduction and development · 2026
    Review
  5. Article
  6. Article
  7. Review
  8. Review
  9. Review
  10. Review
  11. Article
  12. The androgen clock is an epigenetic predictor of long-term male hormone exposure.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  13. Profiling Genome-Wide Methylation Patterns in Cattle Infected withInternational journal of molecular sciences · 2024
    Article
  14. Article
  15. Ovarian aging: energy metabolism of oocytes.Journal of ovarian research · 2024
    Review
  16. CRL4Cellular and molecular life sciences : CMLS · 2024
    Article
  17. Article
  18. Review
  19. Review
  20. Article
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

7 authors at 4 institutions in 3 countries.

Paweł KordowitzkiInstitute of Animal Reproduction and Food Research of Polish Academy of Sciences, Olsztyn, Poland.ORCID 0000-0002-3344-5060
Amin HaghaniDepartment of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, CA, USA.ORCID 0000-0002-6052-8793
Joseph A ZollerDepartment of Biostatistics, Fielding School of Public Health, University of California, Los Angeles, CA, USA.ORCID 0000-0001-6309-0291
Caesar Z LiDepartment of Biostatistics, Fielding School of Public Health, University of California, Los Angeles, CA, USA.ORCID 0000-0002-3907-7983
Ken RajRadiation Effects Department, Centre for Radiation, Chemical and Environmental Hazards, Public Health England, Didcot, UK.ORCID 0000-0002-3744-265X
Matthew L SpanglerDepartment of Animal Science, University of Nebraska, Lincoln, NE, USA.ORCID 0000-0001-5184-501X
Steve HorvathDepartment of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, CA, USA.ORCID 0000-0002-4110-3589
University of California, Los Angeles · USNicolaus Copernicus University · PLPublic Health England · GBUniversity of Nebraska–Lincoln · US

Funding

Training Grant in Neurobehavioral GeneticsT32NS048004 · NINDS · UNIVERSITY OF CALIFORNIA LOS ANGELES · PI BEARDEN, CARRIE E, OPHOFF, ROEL A · 2004 to 2025
$5.8M
Neurodevelopment and Psychosis in the 22q11.2 Copy Number VariantsR37MH085953 · NIMH · UNIVERSITY OF CALIFORNIA LOS ANGELES · PI CARRIE E BEARDEN · 2023 to 2026
$2.9M
NIMH NIH HHS R37 MH085953NINDS NIH HHS T32 NS048004
6 · The paper itself

Abstract

Cattle are an attractive animal model of fertility in women due to their high degree of similarity relative to follicle selection, embryo cleavage, blastocyst formation, and gestation length. To facilitate future studies of the epigenetic underpinnings of aging effects in the female reproductive axis, several DNA methylation-based biomarkers of aging (epigenetic clocks) for bovine oocytes are presented. One such clock was germane to only oocytes, while a dual-tissue clock was highly predictive of age in both oocytes and blood. Dual species clocks that apply to both humans and cattle were also developed and evaluated. These epigenetic clocks can be used to accurately estimate the biological age of oocytes. Both epigenetic clock studies and epigenome-wide association studies revealed that blood and oocytes differ substantially with respect to aging and the underlying epigenetic signatures that potentially influence the aging process. The rate of epigenetic aging was found to be slower in oocytes compared to blood; however, oocytes appeared to begin at an older epigenetic age. The epigenetic clocks for oocytes are expected to address questions in the field of reproductive aging, including the central question: how to slow aging of oocytes.

Indexed as

DNA MethylationEpigenesis, GeneticAgingAnimalsCattleCpG IslandsFemaleHumansModels, AnimalOocytesReproductionDNA methylationepigenetic clockepigenome-wide association studyoocytesreproductive aging

Identifiers

PMID33797841
PMCPMC8135012
OpenAlexW3149522444

What Socratic holds

Textmetadata
LicenceCC BY
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 Socratic graph.