Elsevier

Neuroscience Letters

Volume 377, Issue 1, 22 March 2005, Pages 49-52
Neuroscience Letters

Investigation of transcription factor AP-2beta genotype in women with premenstrual dysphoric disorder

https://doi.org/10.1016/j.neulet.2004.11.068Get rights and content

Abstract

It has repeatedly been shown that the serotonergic system is involved in the symptomatology of premenstrual dysphoric disorder (PMDD). Women with PMDD are reported to differ from symptom-free controls with regard to serotonin-related biological markers. Evidence from family and twin studies suggests a genetic contribution to the aetiology of PMDD. The expression of human transcription factor AP-2β in neural crest cell lineages and neuroectodermal cells suggests that this protein may be of importance for functional characteristics of neurons by regulating the expression of target genes. Within the monoaminergic systems, several genes have binding sites for AP-2β in regulatory regions, suggesting an involvement of AP-2β in these systems. The gene encoding AP-2β is located on chromosome 6p12–p21.1 and includes a polymorphic region consisting of a variable number of [CAAA] repeats located in the second intron. We have earlier shown that AP-2β genotype is associated with serotonergic phenotypes and that brainstem levels of AP-2β correlate positively to serotonin metabolism in rat frontal cortex. The aim of this study was to investigate the relationship between PMDD and transcription factor AP-2β genotype. The participants included 176 women with PMDD and 91 healthy controls. Genotyping was performed by polymerase chain reactions. We did not observe any differences in AP-2β genotype frequencies between PMDD subjects and controls. Our results suggest that AP-2β genotype is not a risk factor for PMDD. To our knowledge, this is the first study investigating transcription factor AP-2β genotype in women with PMDD. Hence, these results should be considered preliminary until replicated.

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Acknowledgements

This study was supported by grants from the Swedish Brain Research Foundation and the Swedish Medical Research Council (#4145). The authors would like to thank Sigrid Sandberg for excellent technical help and Staffan Nilsson for power calculations.

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      Estimates of heritability for premenstrual symptoms range from 22% to 37% and are as high as 43.3% for severe premenstrual symptoms (Kendler et al., 1992). Several genetic polymorphisms have been tested for possible association with PMDD (Damberg et al., 2005; Melke et al., 2003) including the following: three variants in the serotonin transporter (SLC6A4), specifically the serotonin transporter gene-linked polymorphic region (5-HTTLPR) (Heils et al., 1995), an intron 2 variable number of tandem repeats (VNTR) (Ogilvie et al., 1996), and a G to T single nucleotide polymorphism (SNP) in the 3′ untranslated region (UTR) (Battersby et al., 1999); an intron 2 VNTR in the gene for transcription factor activating protein 2beta (AP-2beta) (Damberg et al., 2005); gene-based haplotypic variants in genes for estrogen receptor alpha (ESR-1), estrogen receptor beta, and progesterone receptor (Huo et al., 2007). We have previously reported a significant association between PMDD and ESR-1 (Huo et al., 2007); significant associations have also been reported for serotonin receptor 1A (Dhingra et al., 2007) and 5-HTTLPR (Praschak-Rieder et al., 2002).

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      Several studies have attempted to delineate the genetic basis for differences in serotonin function and metabolism in women with PMDD. Research into AP-2, 5HT transporter, tryptophan hydroxylase, and monoamine oxidase genotypes has mostly been inconclusive.52,59,60 However, Praschak-Rieder and colleagues61 found an association between PMDD and 5HTLLPR heterozygosity in women with seasonal affective disorder, and Steiner and colleagues46 identified a relationship between polymorphism in the serotonin transporter gene and severity of PMDD symptoms.

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