The relationship of 5HTT (SLC6A4) methylation and genotype on mRNA expression and liability to major depression and alcohol dependence in subjects from the Iowa Adoption Studies.
- Authors
- Philibert, Robert A; Sandhu, Harinder; Hollenbeck, Nancy; Gunter, Tracy; Adams, William; Madan, Anup
- Year
- 2008
- Journal
- American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics
- PMID
- 17987668
- DOI
- 10.1002/ajmg.b.30657
- PMCID
- PMC3643119
Serotonin Transporter (5HTT or SLC6A4) mRNA transcription is regulated by both genetic and epigenetic mechanisms. Unfortunately, despite intense scrutiny, the exact identity and contribution of each of these regulatory mechanisms, and their relationship to behavioral illness remain unknown. This lack of knowledge is critical because alterations in SLC6A4 function are posited to be central to a wide variety of CNS disorders. In order to address this shortcoming, we quantified 5HTTLPR genotype, SLC6A4 mRNA production and CpG methylation using biomaterial from 192 lymphoblast cell lines derived from subjects who participated in the latest wave of the Iowa Adoption Studies. We then analyzed the resulting data with respect to clinical characteristics. We confirmed prior findings that the short (s) 5HTTLPR allele is associated with lower amounts of mRNA transcription, but there was no significant effect of the "Long G" allele on mRNA transcription. We also found that CpG methylation was higher (P < 0.0008) and mRNA production (P < 0.0001) was lower in females as compared to males. Those subjects with a lifetime history of Alcohol Dependence had higher levels of SLC6A4 mRNA. There was a trend for an association of increased overall methylation with lifetime history of major depression. Finally, we confirm our prior findings that the exact levels of 5HTT mRNA expression are dependent on how it is measured. We conclude that both genetic variation and epigenetic modifications contribute to the regulation of SLC6A4 function and that more in-depth studies of the molecular mechanisms controlling gene activity and the relationship of these mechanisms to behavioral illness are indicated.
The sequence of the 5HTT CpG island and position of the CpG residues. The base pair position according to the UCSD Genome Browser March 2006 Assembly (SLC6A4 chr17:25586414-25587412) is given on the left-hand side. All studied CpG residues are denoted in bold and blue with CpG residue 1 corresponding to bp 25586514. The sequence corresponding to SLC6A4 exon 1 is denoted by lower case letters.
The average methylation at each CpG residue for each sex. The values for females are depicted by blue squares while the values for males are depicted by red circles. The position of SLC6A4 exon1 is denoted by the box with the direction of transcription being indicated by the line with arrows.
The relationship between 5HTTLPR genotype and SLC6A4 mRNA expression. Using an ordinal regression that specifies an additive effect of the s allele, there is a significant relationship between genotype and 5HTT expression as measured by the exon 1 probe (P < 0.02, ANOVA), but not the exon 8 probe (P < 0.59) [lower Z scores mean lower CT counts or more transcript]. Similarly, when contrasting just the s,s and l,l groups, the relationship is also significant for the exon 1 probe (P < 0.007, t-test), but not the exon 8 probe (P < 0.30). The n for each group is given below the genotype.
| Name | Type |
|---|---|
| 5HTTLPR | variant |
| 5HTTLPR l allele local | variant |
| 5HTTLPR s allele local | variant |
| 5HTT mRNA expression local | phenotype |
| 5HTT mRNA production local | phenotype |
| 89 cell lines local | cohort |
| aAβG polymorphism local | variant |
| adoption studies | cohort |
| alcohol dependence | phenotype |
| alcoholism | phenotype |
| Alzheimer's disease | phenotype |
| antidepressants | drug |
| Applied Biosystems cDNA archiving kit local | drug |
| autism | phenotype |
| cDNA | drug |
| cell lines | cohort |
| central nervous system | anatomy |
| clinical effect local | phenotype |
| common behavioral illness local | phenotype |
| CpG 30β33 local | variant |
| CpG 62 local | variant |
| CpG 7 local | variant |
| CpG island methylation local | drug |
| current depression | phenotype |
| diagnosis | phenotype |
| DNA | drug |
| DNA methylation | drug |
| EBV | drug |
| exon 1 probe local | drug |
| exon 8 probe local | drug |
| female subjects | cohort |
| GAPDH | gene |
| gene expression | phenotype |
| human subjects | cohort |
| IAS subjects local | cohort |
| Invitrogen RNA purification kit local | drug |
| l allele | variant |
| LDHA local | gene |
| Long G local | variant |
| Long G allele local | variant |
| lymphoblast cell lines local | cohort |
| Lymphoblast cell lines local | cohort |
| Lymphoblast lines local | cohort |
| major depressive disorder | phenotype |
| male subjects | cohort |
| MD | phenotype |
| MD episode local | phenotype |
| Methylation ratios local | phenotype |
| migraine headache local | phenotype |
| neuropsychiatric illness local | phenotype |
| Neuropsychiatric illness local | phenotype |
| RNA | drug |
| s allele | cohort |
| selective serotonin reuptake inhibitors | drug |
| Serotonergic Dysfunction local | phenotype |
| serotonergic neurons | anatomy |
| sex | phenotype |
| SLC6A4 | gene |
| SLC6A4 mRNA expression local | phenotype |
| symptom count | phenotype |
| White population local | phenotype |
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