To determine the basis of psychiatric disturbances in patients with “diabetes mellitus due to 3243 mitochondrial tRNA mutation (DM-Mt3243)”, 15 subjects with the mutation (14 patients with diabetes and one patient with impaired glucose tolerance) were examined with questionnaires. None had typical clinical pictures of MELAS.
Result; Six patients consulted a psychiatrist. In clinical examinations using the DSM-III-R criteria, two patients were diagnosed as having phobic disorders, two major depressive disorders, one dysthymia, and one schizophrenia. Two had cryptogenic chest pain.
The remaining 9 patients refused to consult a psychiatrist. Among them, diabetologists diagnosed one patient as having a depressive episode and two as having sleeping disorders.
Thus, among the 15 subjects, nine patients suffered from mental disorders which were categorized into “functional psychosis”. In addition, five (33.3%) could not commute regularly to the hospital. Conclusion; While distinct encephalopathy was not observed, ambiguous psychiatric disorders possibly reflecting functional psychosis, were observed frequently in our DM-Mt3243 subjects. This observation suggests that psychiatric disturbances are associated with DM-Mt3243 and that mitochondrial dysfunction is important in the etiology of psychiatric disorders in diabetes.
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