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A MIR4646 associated methylation locus is hypomethylated in adolescent depression


Boström, Adrian E; Ciuculete, Diana-Maria; Attwood, Misty; Krattinger, Regina; Nikontovic, Lamia; Titova, Olga E; Kullak-Ublick, Gerd A; Mwinyi, Jessica; Schiöth, Helgi B (2017). A MIR4646 associated methylation locus is hypomethylated in adolescent depression. Journal of Affective Disorders, 220:117-128.

Abstract

BACKGROUND: Studies of epigenetics and transcriptional activity in adolescents may provide knowledge about possible preventive strategies of depression.
METHODS: We present a methylome-wide association study (MWAS) and cohort validation analysis of depression in adolescents, in two separate cohorts: discovery (n=93) and validation data set 1 (n=78). The genome-wide methylation pattern was measured from whole blood using the Illumina 450K array. A second validation cohort, validation data set 2, consists of post-mortem brain biopsies from depressed adults (n=58). We performed a MWAS by robust multiple linear regressions of methylation to a modified risk-score assessment of depression. Methylation levels of candidate CpG sites were correlated with expression levels of the associated gene in an independent cohort of 11 healthy volunteers.
RESULTS: The methylation state of two CpG sites reliably predicted ratings of depression in adolescents (cg13227623 and cg04102384) (p<10E-06). Cohort validation analysis confirmed cg04102384 - located in the promoter region of microRNA 4646 (MIR4646) - to be hypomethylated in both validation data set 1 and validation data set 2 (p<0.05). Cg04102384 was inversely correlated to expression levels of MIR4646-3p in healthy controls (p<0.05).
LIMITATIONS: MIR4646 was not differentially expressed in a subset of samples with adolescent depression measured by qRT-PCR measurements.
CONCLUSION: We identify a specific MIR4646 associated epigenetic risk site to be associated with depression in adolescents. Cg04102384 putatively regulates gene expression of MIR4646-3p. Target gene prediction and gene set overrepresentation analysis revealed involvement of this miRNA in fatty acid elongation, a process related to omega-3 fatty acids, previously associated with depression.

Abstract

BACKGROUND: Studies of epigenetics and transcriptional activity in adolescents may provide knowledge about possible preventive strategies of depression.
METHODS: We present a methylome-wide association study (MWAS) and cohort validation analysis of depression in adolescents, in two separate cohorts: discovery (n=93) and validation data set 1 (n=78). The genome-wide methylation pattern was measured from whole blood using the Illumina 450K array. A second validation cohort, validation data set 2, consists of post-mortem brain biopsies from depressed adults (n=58). We performed a MWAS by robust multiple linear regressions of methylation to a modified risk-score assessment of depression. Methylation levels of candidate CpG sites were correlated with expression levels of the associated gene in an independent cohort of 11 healthy volunteers.
RESULTS: The methylation state of two CpG sites reliably predicted ratings of depression in adolescents (cg13227623 and cg04102384) (p<10E-06). Cohort validation analysis confirmed cg04102384 - located in the promoter region of microRNA 4646 (MIR4646) - to be hypomethylated in both validation data set 1 and validation data set 2 (p<0.05). Cg04102384 was inversely correlated to expression levels of MIR4646-3p in healthy controls (p<0.05).
LIMITATIONS: MIR4646 was not differentially expressed in a subset of samples with adolescent depression measured by qRT-PCR measurements.
CONCLUSION: We identify a specific MIR4646 associated epigenetic risk site to be associated with depression in adolescents. Cg04102384 putatively regulates gene expression of MIR4646-3p. Target gene prediction and gene set overrepresentation analysis revealed involvement of this miRNA in fatty acid elongation, a process related to omega-3 fatty acids, previously associated with depression.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Clinical Pharmacology and Toxicology
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2017
Deposited On:27 Jun 2017 10:10
Last Modified:27 Jun 2017 10:16
Publisher:Elsevier
ISSN:0165-0327
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.jad.2017.05.017
PubMed ID:28618313

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