Evidence map›Paper›PMID 27271857›Full record

ArticleTranslational psychiatry2016

CACNA1C hypermethylation is associated with bipolar disorder.

A Starnawska, D Demontis, A Pen, A Hedemand, A L Nielsen, N H Staunstrup, J Grove, T D Als, A Jarram, N L O'Brien and 4 more

Open access · goldAbstract read
In one paragraph

Article in Translational psychiatry, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 32 papers.

0numbers the graph read from it
0cells of the map it votes in
32citing papers in PubMed
2.8field-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

32 citing papers in PubMed, 58 citations in OpenAlex.

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  10. Reduced Gene Dosage of the Psychiatric Risk GeneInternational journal of molecular sciences · 2025
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  15. Review
  16. Article
  17. Prediction of the Duration to Next Admission for an Acute Affective Episode in Patients with Bipolar I Disorder.Clinical psychopharmacology and neuroscience : the official scientific journal of the Korean College of Neuropsychopharmacology · 2023
    Article
  18. Review
  19. Article
  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

14 authors at 4 institutions in 2 countries.

A StarnawskaDepartment of Biomedicine, Aarhus University, Aarhus, Denmark.
D DemontisDepartment of Biomedicine, Aarhus University, Aarhus, Denmark.
A PenDepartment of Biomedicine, Aarhus University, Aarhus, Denmark.
A HedemandDepartment of Biomedicine, Aarhus University, Aarhus, Denmark.
A L NielsenDepartment of Biomedicine, Aarhus University, Aarhus, Denmark.
N H StaunstrupDepartment of Biomedicine, Aarhus University, Aarhus, Denmark.
J GroveDepartment of Biomedicine, Aarhus University, Aarhus, Denmark.
T D AlsDepartment of Biomedicine, Aarhus University, Aarhus, Denmark.
A JarramMolecular Psychiatry Laboratory, Division of Psychiatry, University College London, London, UK.
N L O'BrienMolecular Psychiatry Laboratory, Division of Psychiatry, University College London, London, UK.
O MorsThe Lundbeck Foundation Initiative for Integrative Psychiatric Research, iPSYCH, Denmark.
A McQuillinMolecular Psychiatry Laboratory, Division of Psychiatry, University College London, London, UK.
A D BørglumDepartment of Biomedicine, Aarhus University, Aarhus, Denmark.
M NyegaardDepartment of Biomedicine, Aarhus University, Aarhus, Denmark.
Aarhus University · DKLundbeck Foundation · DKUniversity College London · GBAarhus University Hospital · DK

Funding

Medical Research Council G0500791Medical Research Council G0701007Medical Research Council G1000708
6 · The paper itself

Abstract

The CACNA1C gene, encoding a subunit of the L-type voltage-gated calcium channel is one of the best-supported susceptibility genes for bipolar disorder (BD). Genome-wide association studies have identified a cluster of non-coding single-nucleotide polymorphisms (SNPs) in intron 3 to be highly associated with BD and schizophrenia. The mechanism by which these SNPs confer risk of BD appears to be through an altered regulation of CACNA1C expression. The role of CACNA1C DNA methylation in BD has not yet been addressed. The aim of this study was to investigate if CACNA1C DNA methylation is altered in BD. First, the methylation status of five CpG islands (CGIs) across CACNA1C in blood from BD subjects (n=40) and healthy controls (n=38) was determined. Four islands were almost completely methylated or completely unmethylated, while one island (CGI 3) in intron 3 displayed intermediate methylation levels. In the main analysis, the methylation status of CGI 3 was analyzed in a larger sample of BD subjects (n=582) and control individuals (n=319). Out of six CpG sites that were investigated, five sites showed significant hypermethylation in cases (lowest P=1.16 × 10(-7) for CpG35). Nearby SNPs were found to influence the methylation level, and we identified rs2238056 in intron 3 as the strongest methylation quantitative trait locus (P=2.6 × 10(-7)) for CpG35. In addition, we found an increased methylation in females, and no difference between bipolar I and II. In conclusion, we find that CACNA1C methylation is associated with BD and suggest that the regulatory effect of the non-coding risk variants involves a shift in DNA methylation.

Indexed as

Bipolar DisorderCalcium Channels, L-TypeCpG IslandsDNA MethylationFemaleGene Expression RegulationGenotypeHumansIntronsMalePolymorphism, Single NucleotideQuantitative Trait LociReference ValuesSex FactorsCACNA1C protein, humanCalcium Channels, L-Type

Identifiers

PMID27271857
PMCPMC4931616
OpenAlexW2417705533

What OpenQuestion holds

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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.