Evidence map›Paper›PMID 27051467›Full record

ArticleClinical epigenetics2016

TREM2 upregulation correlates with 5-hydroxymethycytosine enrichment in Alzheimer's disease hippocampus.

Naiara Celarain, Javier Sánchez-Ruiz de Gordoa, María Victoria Zelaya, Miren Roldán, Rosa Larumbe, Laura Pulido, Carmen Echavarri, Maite Mendioroz

Abstract read
In one paragraph

Article in Clinical epigenetics, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 54 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
54citing papers in PubMed, 2 pooled it
–field-weighted citation impact
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

54 citing papers in PubMed, 2 syntheses or guidelines pooled it.

  1. Pooled it
  2. Pooled it
  3. Review
  4. TREM2 in neurodegeneration and diseases.Molecular psychiatry · 2026
    Review
  5. Review
  6. Review
  7. Article
  8. Roles of TREM2 in Alzheimer's disease.Translational neurodegeneration · 2025
    Review
  9. Review
  10. Review
  11. Review
  12. Article
  13. Article
  14. Review
  15. Article
  16. TREM2 Expression and Amyloid-Beta Phagocytosis in Alzheimer's Disease.International journal of molecular sciences · 2023
    Article
  17. Review
  18. Review
  19. Review
  20. 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

8 authors.

Naiara CelarainNeuroepigenetics Laboratory, Navarrabiomed-Navarra Institute for Health Research (IdiSNA), c/ Irunlarrea, Pamplona, Navarra 31008 Spain.
Javier Sánchez-Ruiz de GordoaNeuroepigenetics Laboratory, Navarrabiomed-Navarra Institute for Health Research (IdiSNA), c/ Irunlarrea, Pamplona, Navarra 31008 Spain ; Department of Neurology, Complejo Hospitalario de Navarra, Pamplona, Navarra 31008 Spain ; Present address: Clínica San Miguel, Pamplona, Navarra 31006 Spain.
María Victoria ZelayaDepartment of Pathology, Complejo Hospitalario de Navarra, Pamplona, Navarra 31008 Spain.
Miren RoldánNeuroepigenetics Laboratory, Navarrabiomed-Navarra Institute for Health Research (IdiSNA), c/ Irunlarrea, Pamplona, Navarra 31008 Spain.
Rosa LarumbeNeuroepigenetics Laboratory, Navarrabiomed-Navarra Institute for Health Research (IdiSNA), c/ Irunlarrea, Pamplona, Navarra 31008 Spain ; Department of Neurology, Complejo Hospitalario de Navarra, Pamplona, Navarra 31008 Spain.
Laura PulidoNeuroepigenetics Laboratory, Navarrabiomed-Navarra Institute for Health Research (IdiSNA), c/ Irunlarrea, Pamplona, Navarra 31008 Spain ; Department of Neurology, Complejo Hospitalario de Navarra, Pamplona, Navarra 31008 Spain ; Present address: Clínica San Miguel, Pamplona, Navarra 31006 Spain.
Carmen EchavarriNeuroepigenetics Laboratory, Navarrabiomed-Navarra Institute for Health Research (IdiSNA), c/ Irunlarrea, Pamplona, Navarra 31008 Spain ; Hospital Psicogeriátrico Josefina Arregui, Alsasua, Navarra 31800 Spain.
Maite MendiorozNeuroepigenetics Laboratory, Navarrabiomed-Navarra Institute for Health Research (IdiSNA), c/ Irunlarrea, Pamplona, Navarra 31008 Spain ; Department of Neurology, Complejo Hospitalario de Navarra, Pamplona, Navarra 31008 Spain.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundRecent genome-wide association studies revealed TREM2 rs75932628-T variant to be associated with Alzheimer's disease (AD) and other neurodegenerative diseases. However, the role that TREM2 plays in sporadic AD is largely unknown. Our aim was to assess messenger RNA (mRNA) expression levels and DNA methylation profiling of TREM2 in human hippocampus in AD brain. We measured TREM2 mRNA levels in the hippocampus in a cohort of neuropathologically confirmed controls and pure AD cases showing no other protein deposits than β-amyloid and phosphorylated tau. We also examined DNA methylation levels in the TREM2 transcription start site (TSS)-associated region by bisulfite cloning sequencing and further extended the study by measuring 5-hydroxymethycytosine (5hmC) enrichment at different regions of TREM2 by 5hmC DNA immunoprecipitation combined with real-time qPCR.

resultsA 3.4-fold increase in TREM2 mRNA levels was observed in the hippocampus of AD cases compared to controls (p = 1.1E-05). Interestingly, TREM2 methylation was higher in AD cases compared to controls (76.2 % ± 15.5 versus 57.9 % ± 17.1; p = 0.0016). Moreover, TREM2 mRNA levels in the AD hippocampus correlated with enrichment in 5hmC at the TREM2 gene body (r = 0.771; p = 0.005).

conclusionsTREM2 mRNA levels are increased in the human hippocampus in AD cases compared to controls. DNA methylation, and particularly 5hmC, may be involved in regulating TREM2 mRNA expression in the AD brain. Further studies are guaranteed to investigate in depth the role of 5hmC in AD and other neurodegenerative disorders.

Indexed as

Up-Regulation5-MethylcytosineAdultAgedAged, 80 and overAlzheimer DiseaseCytosineDNA MethylationFemaleGenome-Wide Association StudyHippocampusHumansMaleMembrane GlycoproteinsMiddle AgedReceptors, Immunologic5-hydroxymethylcytosine5-MethylcytosineCytosineMembrane GlycoproteinsReceptors, ImmunologicTREM2 protein, human5-HydroxymethycytosineAlzheimer’s diseaseDNA methylationEpigeneticsGene expressionTREM2

Identifiers

PMID27051467
PMCPMC4820985

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Registered trials

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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.