Aim: The aim of this study was to provide new insights into the genetics of bipolar disorder (BD) by analyzing BD comorbid with anxiety disorders.
Methods: Structured interviews were conducted with BD patients and their parents. Cases were classified into those with comorbid anxiety spectrum (AS) and those without. The family history of patients with BD with comorbid AS was assessed. Focusing on parent-of-origin effects and genomic imprinting from the results, imprinted genes and tested single nucleotide polymorphisms (SNPs) in the identified genes were investigated for an association with BD by transmission disequilibrium test (TDT) using published whole-exome sequencing data.
Results: The incidence of comorbid AS among all the patients with BD analyzed in this study was 39.6%. Patients with BD whose fathers had AS or mood disorders exhibited a significantly higher rate of AS. Among the known imprinted genes, two were associated with BD: and . By pruning SNPs, six variants of the exons and four variants of the exons were included in the analysis. Among these, one variant of , rs2074603, showed over-transmission from parents to patients with BD. Furthermore, it was nominally significant only for fathers when TDT was performed separately for fathers and mothers.
Conclusion: may play a role in BD with parent-of-origin effects. Further research is necessary to explore the mechanisms by which genomic imprinting is associated with BD. N/A.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11839488 | PMC |
| http://dx.doi.org/10.1002/pcn5.70071 | DOI Listing |
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