Evidence map›Paper›PMID 19876730›Full record

ArticleJournal of assisted reproduction and genetics

Oxidative DNA damage impairs global sperm DNA methylation in infertile men.

Ozlem Tunc, Kelton Tremellen

Open access · bronzeAbstract read
In one paragraph

Article in Journal of assisted reproduction and genetics. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 98 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
98citing papers in PubMed, 1 pooled it
4.0field-weighted citation impact, top 5% 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

98 citing papers in PubMed, 1 synthesis or guideline pooled it, 238 citations in OpenAlex.

  1. Pooled it
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  10. Integration of epigenetics into ecotoxicology: insights and fundamental research needs.Biological reviews of the Cambridge Philosophical Society · 2026
    Review
  11. Unravelling male infertility through epigenetics: present understanding and future challenges.Mammalian genome : official journal of the International Mammalian Genome Society · 2026
    Review
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  13. Article
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  17. Evaluation ofJournal of the Turkish German Gynecological Association · 2025
    Article
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  20. Review

38 more citing papers are in PubMed but not listed here.

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

2 authors at 2 institutions in 2 countries.

Ozlem TuncResearch Centre for Reproductive Health, Discipline of Obstetrics and Gynaecology, School of Paediatrics and Reproductive Health, University of Adelaide, Adelaide, South Australia.
Kelton Tremellen
Dulwich Community Hospital · GBUniversity of Adelaide · AU

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeMethylation of sperm DNA is impaired in many infertile men potentially adversely effecting reproductive outcomes. In somatic cells oxidative damage to DNA and hyperhomocysteinaemia are linked with DNA hypomethylation. The objective of this study was to investigate if these pathologies also impair sperm DNA methylation.

methodsThe relationship between sperm DNA quality, oxidative stress and serum homocysteine was analysed at study entry and after 3 months of antioxidant treatment.

resultsOverall a significant negative correlation was observed between sperm DNA methylation and sperm DNA fragmentation, as well as seminal reactive oxygen species (ROS) production. Sperm DNA methylation was not significantly related to serum homocysteine concentrations. Administration of an antioxidant supplement produced a significant fall in seminal ROS levels and sperm DNA fragmentation, while increasing sperm DNA methylation.

conclusionsThese results suggest that oxidative stress related damage to sperm DNA impedes the process of methylation, while antioxidant supplementation appears to have the potential to reduce DNA damage and normalize sperm DNA methylation.

Indexed as

DNA DamageOxidative StressSpermatozoaAntioxidantsDNA FragmentationDNA MethylationHomocysteineHumansInfertility, MaleMaleReactive Oxygen SpeciesSperm MotilityTreatment OutcomeAntioxidantsHomocysteineReactive Oxygen Species

Identifiers

PMID19876730
PMCPMC2788683
OpenAlexW2153523586

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.