Bipolar disorder and the serotonin transporter gene: a family-based association study

Kirov, George ORCID: https://orcid.org/0000-0002-3427-3950, Rees, M., Jones, Ian Richard ORCID: https://orcid.org/0000-0001-5821-5889, McCandless, F, Owen, Michael John ORCID: https://orcid.org/0000-0003-4798-0862 and Craddock, Nicholas John ORCID: https://orcid.org/0000-0003-2171-0610 1999. Bipolar disorder and the serotonin transporter gene: a family-based association study. Psychological Medicine -London- 29 (5) , pp. 1249-1254. 10.1017/s003329179900882x

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Abstract

BACKGROUND: The human serotonin transporter gene (5-HTT) is a strong candidate for involvement in the pathogenesis of mood disorders. Two common polymorphisms have been identified in the gene: a VNTR in intron 2 and a functional deletion/insertion in the promoter region. In previous studies we proposed that allele 12 of the VNTR might increase susceptibility for bipolar disorder. METHODS: We have genotyped 122 parent-offspring trios of British Caucasian origin where the proband had DSM-IV Bipolar I disorder (BPI). The results were analysed with the transmission/ disequilibrium test (TDT), which examines whether particular alleles are preferentially transmitted from heterozygous parents to affected offspring. RESULTS: The 12 repeat in the VNTR in intron 2 was transmitted 72 times and not transmitted 56 times (chi2 = 2.0, 1 df, P = 0.16). If we exclude 24 families in which the proband was a case in our published case-control studies (Collier et al. 1996a; Rees et al. 1997), the excess transmission of allele 12 reaches conventional levels of statistical significance: chi2 = 3.85, 1 df, P < 0.05. The deletion/insertion polymorphism in the promoter region was not associated with BPI: 66 parents transmitted the inserted (L) allele and 59 parents transmitted the deleted (S) allele (chi2 = 0.39, 1 df, P = 0.53). CONCLUSIONS: The 12 repeat of the VNTR in intron 2 of the serotonin transporter gene might be a susceptibility factor in bipolar affective disorder. The genetic effect, if true, is likely to be small, and requires confirmation in further studies using parental controls.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG) Neuroscience and Mental Health Research Institute (NMHRI)
Subjects:	R Medicine > R Medicine (General) R Medicine > RZ Other systems of medicine
Publisher:	Cambridge University Press
ISSN:	0033-2917
Last Modified:	27 Oct 2022 08:42
URI:	https://orca.cardiff.ac.uk/id/eprint/63176

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