Evidence map›Paper›PMID 25221426›Full record

ArticleMolecular vision2014

Keratoconus is associated with increased copy number of mitochondrial DNA.

Khaled K Abu-Amero, Altaf A Kondkar, Taif Anwar Azad, Tahira Sultan, Hatem Kalantan, Abdulrahman M Al-Muammar

Open access · greenAbstract read
In one paragraph

Article in Molecular vision, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.

0numbers the graph read from it
0cells of the map it votes in
14citing papers in PubMed
3.5field-weighted citation impact, top 8% 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

14 citing papers in PubMed, 19 citations in OpenAlex.

  1. Article
  2. Gender-specific association ofFrontiers in genetics · 2024
    Article
  3. Article
  4. Article
  5. Review
  6. Article
  7. Article
  8. Article
  9. Contact Lenses for Keratoconus- Current Practice.The open ophthalmology journal · 2017
    Article
  10. Keratoconus: an inflammatory disorder?Eye (London, England) · 2015
    Review
  11. Article
  12. Article
  13. Article
  14. Genetics of keratoconus: where do we stand?Journal of ophthalmology · 2014
    Review
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

6 authors at 1 institution in 1 country.

Khaled K Abu-AmeroOphthalmic Genetics Laboratory, Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia ; Department of Ophthalmology, College of Medicine, University of Florida, Jacksonville, FL.
Altaf A KondkarOphthalmic Genetics Laboratory, Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia.
Taif Anwar AzadOphthalmic Genetics Laboratory, Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia.
Tahira SultanOphthalmic Genetics Laboratory, Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia.
Hatem KalantanAnterior Segment Unit, Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia.
Abdulrahman M Al-MuammarAnterior Segment Unit, Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia.
King Saud University · SA

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeTo investigate the possible association of oxidative stress with keratoconus (KC), we estimated the changes in relative mitochondrial DNA (mtDNA) content.

methodsThe study included 119 patients with KC and 208 controls matched for gender, ethnicity, and systemic disease status. We selected controls who were older than the patients since the mtDNA copy number tends to increase with age. The age mean (standard deviation) was 26.4(7.6) and 54.5(14.4) years for the patients and controls, respectively. The relative mtDNA copy number was estimated with the real-time quantitative PCR (qPCR) method using ND1 as the mtDNA gene and human globulin (HGB; also known as the cytoglobin gene, CYGB) as the reference single-copy nuclear gene.

resultsThe mean relative mtDNA content was significantly higher in patients with KC (1.20±0.45) than in the normal control subjects (1.04±0.36; p = 0.0004). Subjects with high mtDNA content (>1.259, i.e., greater than 75(th) percentile) were at an increased risk of the disease (odds ratio = 2.62, 95% confidence interval = 1.40 to 4.89; p =0.0025).

conclusionsIncreased mtDNA content in patients with KC may indicate mitochondrial respiratory chain defects and thus mitochondrial-abnormality involvement.

Indexed as

Gene DosageGenes, MitochondrialAdultCase-Control StudiesCytoglobinDNA, MitochondrialFemaleGlobinsHumansKeratoconusMaleMiddle AgedNADH DehydrogenaseOxidative StressReal-Time Polymerase Chain ReactionRisk FactorsCYGB protein, humanCytoglobinDNA, MitochondrialGlobinsNADH DehydrogenaseNADH dehydrogenase subunit 1, human

Identifiers

PMID25221426
PMCPMC4153421
OpenAlexW2098685511

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
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.