MK4MDD

Genetic/Epigenetic Locus Search Cross Data Search

Study Report

Reference

Citation	Saus, 2010 PubMed
Full Info	Saus, E., Soria, V., Escaramis, G., Vivarelli, F., Crespo, J.M., Kagerbauer, B., Menchon, J.M., Urretavizcaya, M., Gratacos, M. and Estivill, X. (2010) Genetic variants and abnormal processing of pre-miR-182, a circadian clock modulator, in major depression patients with late insomnia. Hum Mol Genet, 19, 4017-4025.

Study

Hypothesis or Background	Previous studies in mice have reported five different microRNAs (miRNAs; miR-219-1/132/183/96/182) to be modulators of the endogenous circadian clock and have presented experimental evidence for some of the genes involved in the molecular clock machinery as target sites. Moreover, disruption of circadian rhythms has long been implicated in the pathophysiology of major depression (MD). We investigated these miRNAs and some of their target sites at the sequence and functional levels as possible predisposing factors for susceptibility to MD and related chronobiological subphenotypes.
Sample Information	359 MD patients and 341 control individuals
Method Detail	genotyping; Q-PCR; luciferase report
Method Keywords	genotyping; Q-PCR; promoter-luciferase reporter assay
Result	We found a significant association between the T allele of the rs76481776 polymorphism in the pre-miR-182 and late insomnia in MD patients. Previous studies have reported an association between insomnia and CLOCK gene, a predicted miR-182 target site. A significant overexpression of miR-182 was detected by quantitative real-time polymerase chain reaction in cells transfected with the mutated form of the pre-miR-182 when compared with wild-type form. Moreover, a significant reduction in luciferase activity of plasmids with 3' UTR of ADCY6, CLOCK and DSIP genes was shown when transfecting cells with the mutated form of pre-miR-182 compared with cells that did not express miR-182.
Conclusions	These data indicate that abnormal processing of pre-miR-182 in patients carrying the T allele of the rs76481776 polymorphism may contribute to the dysregulation of circadian rhythms in MD patients with insomnia, which could influence expression levels of the mature form of miR-182 and might increase downregulation in some of its target genes.

Relationships reported by Saus, 2010