Ultradian rapid cycling in prepubertal and early adolescent bipolarity is not in transmission disequilibrium with Val/Met COMT alleles

被引:45
作者
Geller, B
Cook, EH
机构
[1] Washington Univ, Sch Med, St Louis, MO 63110 USA
[2] Univ Chicago, Chicago, IL 60637 USA
关键词
bipolar; child; adolescent; catechol O-methyltransferase; alleles; linkage;
D O I
10.1016/S0006-3223(99)00251-6
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Background: Prepubertal children and early adolescents with bipolar disorders (PEA-BP) who participate in the ongoing study "Phenomenology and Course of Pediatric Bipolar Disorders" have a high prevalence of ultradian (within 24-hour periods) rapid cycling. Based on a case-control ol finding reported in bipolar (BP) adults of art association between rapid and ultradian rapid cycling with the low-activity allele of catechol-O-methyltransferase (l-COMT), study of linkage and linkage disequilibrium of l-COMT in the PEA-BP population seemed warranted. Methods: Genotypes on a subset of the larger PEA-BP sample, for whom trio blood collection was complete (i.e., probands and both of their biological parents), were used to perform transmission disequilibrium? tests (TDTs). Diagnoses were established from a comprehensive battery that included WASH-U-KSADS (Washington University Kiddie Schedule for Affective Disorders and Schizophrenia) gh,en to both mothers and children and from consensus conferences. Probands with PEA-BP (N = 52) were 10.9 +/- 2.8 years old at index episode; had a mean age of BP onset at 8.0 +/- 3.8 years, were severely impaired with a mean Children's Global Assessment Scale score of 44.5 +/- 8.9: and manifested the cardinal features of BP (84.6% had euphoric mood, 76.9% had grandiosity, and 57.7% had psychosis). Ultradian rapid cycling occurred in 75%. Genotyping of the single nucleotide polymorphism at COMT was performed using automated capillary electrophoresis single-strand conformational polymorphism with detection by laser-induced fluorescence. Results: Transmission disequilibrium tests were not significant for preferential transmission of l-COMT for the ultradian rapid-cycling subgroup or for the entire PEA-BP sample. Conclusions: The lack of linkage disequilibrium between l-COMT and ultradian rapid cycling in the PEA-BP sample compared to reported findings of an association in case-control studies of adults is discussed iii terms of age-specific developmentally relevant phenotypes, anticipatory mechanisms, and heterogeneity. Repeat TDT analyses after these PEA-BP probands reach their adult phenotypes will be informative. (C) 2000 Society of Biological Psychiatry.
引用
收藏
页码:605 / 609
页数:5
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