Mood congruent psychotic symptoms and specific cognitive deficits in carriers of the novel schizophrenia risk variant at MIR-137

Cummings, Elizabeth, Donohoe, Gary, Hargreaves, April, Moore, Susan, Fahey, Ciara, Dinan, T. G., McDonald, C., O'Callaghan, E., O'Neill, F. A., Waddington, J. L., Murphy, K. C., Morris, Derek, Gill, Michael and Corvin, Aiden (2013) Mood congruent psychotic symptoms and specific cognitive deficits in carriers of the novel schizophrenia risk variant at MIR-137. Neuroscience Letters, 532. pp. 33-38. ISSN 0304-3940

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Abstract

Objective
The Schizophrenia Psychiatric Genome-wide Association (GWAS) Consortium recently reported on five novel schizophrenia susceptibility loci. The most significant finding mapped to a micro-RNA, MIR-137, which may be involved in regulating the function of other schizophrenia and bipolar disorder susceptibility genes.

Method
We genotyped 821 patients with confirmed DSM-IV diagnoses of schizophrenia, bipolar affective disorder I and schizoaffective disorder for the risk SNP (rs1625579) and investigated the clinical profiles of risk allele carriers using a within-case design. We also assessed neurocognitive performance in a subset of cases (n = 399) and controls (n = 171).

Results
Carriers of the risk allele had lower scores for an OPCRIT-derived positive symptom factor (p = 0.04) and lower scores on a lifetime measure of psychosis incongruity (p = 0.017). Risk allele carriers also had more cognitive deficits involving episodic memory and attentional control.

Conclusion
This is the first evidence that the MIR-137 risk variant may be associated with a specific subgroup of psychosis patients. Although the effect of this single SNP was not clinically relevant, investigation of the impact of carrying multiple risk SNPs in the MIR-137 regulatory network on diagnosis and illness profile may be warranted.

Highlights
► We investigated the clinical symptom profiles of carriers of the schizophrenia mir137 risk allele. ► The sample included 821 patients with schizophrenia, schizoaffective disorder and bipolar I disorder. ► Risk allele carriers had lower scores for positive symptoms and less psychosis incongruity. ► On neurocognitive testing in a subset, there were more cognitive deficits in risk allele carriers.

Item Type:	Article
Subjects:	B Philosophy. Psychology. Religion > Psychology B Philosophy. Psychology. Religion > Psychology > Cognition
Divisions:	School of Business > Staff Research and Publications
Depositing User:	Caoimhe Ní Mhaicín
Date Deposited:	12 Apr 2016 18:54
Last Modified:	27 Mar 2018 09:16
URI:	https://norma.ncirl.ie/id/eprint/2153

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