Suicidal ideation in systemic lupus erythematosus: NR2A gene polymorphism,clinical and psychosocial factors

Abstract

Background

Systemic lupus erythematosus (SLE) patients are a high-risk population for suicide. Glutamatergic neurosystem genes have been implicated in the neurobiology of depression in SLE and suicidal behaviour in general. However, the role of glutamate receptor gene polymorphisms in suicidal behaviour among SLE patients remains unclear in the context of established clinical and psychosocial factors. We aimed to investigate the association of NR2A gene polymorphism with suicidal ideation in SLE while accounting for the interaction between clinical and psychosocial factors.

Methods

A total of 130 SLE patients were assessed for mood disorders (MINI International Neuropsychiatric Interview), severity of depression (Patient Health Questionnaire-9), suicidal behaviour (Columbia-Suicide Severity Rating Scale), socio-occupational functioning (Work and Social Adjustment Scale), recent life events (Social Readjustment Rating Scale) and lupus disease activity (SELENA-SLE Disease Activity Index). Eighty-six out of the 130 study participants consented for NR2A genotyping.

Results

Multivariable logistic regression showed nominal significance for the interaction effect between the NR2A rs2072450 AC genotype and higher severity of socio-occupational impairment with lifetime suicidal ideation in SLE patients (p = 0.038, odds ratio = 1.364, 95% confidence interval = 1.018–1.827). However, only the association between lifetime mood disorder and lifetime suicidal ideation remained significant after Bonferroni correction (p < 0.001, odds ratio = 33.834, 95% confidence interval = 7.624–150.138).

Conclusions

Lifetime mood disorder emerged as a more significant factor for suicidal ideation in SLE compared with NR2A gene polymorphism main and interaction effects. Clinical implications include identification and treatment of mood disorders as an early intervention for suicidal behaviour in SLE. More adequately-powered gene–environment interaction studies are required in the future to clarify the role of glutamate receptor gene polymorphisms in the risk stratification of suicidal behaviour among SLE patients.

Keywords

Glutamate receptor gene–environment interaction suicidal ideation neuropsychiatric systemic lupus erythematosus

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