CNVs and Chromosomal Aneuploidy in Patients With Early-Onset Schizophrenia and Bipolar Disorder: Genotype-Phenotype Associations

Introduction: Early-onset schizophrenia (EOS) and bipolar disorder (EOB) start before the age of 18 years and have a more severe clinical course, a worse prognosis, and a greater genetic loading compared to the late-onset forms. Copy number variations (CNVs) are an important genetic factor in the etiology of psychiatric disorders. Therefore, this study aimed to analyze CNVs in patients with EOS and EOB and to establish genotype-phenotype relationships for contiguous gene syndromes or genes affected by identified CNVs. Methods: Molecular karyotyping was performed in 45 patients, 38 with EOS and seven with EOB hospitalized between 2010 and 2017. The exclusion criteria were medical or neurological disorders or IQ under 70. Detected CNVs were analyzed according to the standards and guidelines of the American College of Medical Genetics. Result: Molecular karyotyping showed CNVs in four patients with EOS (encompassing the PAK2, ADAMTS3, and ADAMTSL1 genes, and the 16p11.2 microduplication syndrome) and in two patients with EOB (encompassing the ARHGAP11B and PRODH genes). In one patient with EOB, a chromosomal aneuploidy 47, XYY was found. Discussion: Our study is the first study of CNVs in EOS and EOB patients in Slovenia. Our findings support the association of the PAK2, ARHGAP11B, and PRODH genes with schizophrenia and/or bipolar disorder. To our knowledge, this is also the first report of a multiplication of the ADAMTSL1 gene and the smallest deletion of the PAK2 gene in a patient with EOS, and one of the few reports of the 47, XYY karyotype in a patient with EOB.

Lifetime prevalence of suicidal and self-injurious behaviors in a representative cohort of Slovenian adolescents with type 1 diabetes

OBJECTIVE

To determine lifetime prevalence of suicidal and self-injurious behaviors in Slovenian adolescents with type 1 diabetes compared with healthy controls.

RESEARCH DESIGN AND METHODS

Adolescents (14-19 yr) with type 1 diabetes were compared with a normative control group of healthy secondary school students by means of a self-reported questionnaire (according to Kienhorst) containing questions on demographic and family characteristics, suicidal ideation, intended suicide, attempted suicide, possible future suicide, and self-injurious behavior. Patients received the questionnaires at regular outpatient visits to the pediatric diabetes clinic, completed them in private, and returned them by mail. Questionnaires for control subjects were administered in classrooms.

RESULTS

The responses of 126 eligible patients and 499 controls were analyzed. The control group trended toward higher lifetime prevalence of all suicidal behaviors and self-injurious behavior. The lowest prevalence of all suicidal behaviors and self-injurious behavior was reported by males with diabetes. Compared with male controls, the differences were statistically significant for suicidal ideation (p < 0.05) and intended suicide (p < 0.05). Compared with females with diabetes, the differences were statistically significant for suicidal ideation (p < 0.001), intended suicide (p < 0.01), attempted suicide (p < 0.05), and self-injurious behavior (p < 0.05). Females with diabetes reported highest prevalence of all suicidal but not self-injurious behaviors. More patients than controls reported receiving counseling the year preceding the study (p < 0.001).

CONCLUSIONS

In the study, type 1 diabetes showed a protective effect for suicidal behavior in adolescent males but not in adolescent females. Professionals working with adolescents with type 1 diabetes should be alert to possible suicidality, especially among females.