Investigation of the human serotonin receptor gene HTR3B in bipolar affective and schizophrenic patients.
The neurotransmitter serotonin (5-hydroxytryptamine, 5-HT) mediates a multitude of central nervous functions by activating 5-HT receptor subtypes. A dysfunction of serotonergic neurotransmission is considered to play a major role in the pathophysiology of complex neuropsychiatric disorders. In our study, a mutation screen of the serotonin receptor gene HTR3B was carried out to explore a putative contribution to the etiology of bipolar affective disorder (BPAD) and schizophrenia (SZ). Screening of 49 patients suffering from BPAD, 78 patients with SZ and 62 control individuals revealed eleven sequence variations including a 3 bp deletion within the 5'UTR (5' untranslated region), four exonic and five intronic SNPs as well as a point mutation in the 3'UTR of HTR3B. Four of these sequence variations have not been described previously. Statistical computation rated most variants as probably non-disease related polymorphisms. However, IVS6 + 31C > T, IVS6 + 40C > A, and 1386T > C were solely detected in bipolar affective patients and in none of the controls. Interestingly, we observed a significant underrepresentation of the 3 bp deletion -100_-102delAAG in an extended sample of 162 bipolar affected patients compared to controls (allele-wise: 8% vs. 15%, P = 0.006, OR = 0.49, 95% CI: 0.3-0.82; genotype-wise: 15,5% vs. 29,0%, P = 0.005, OR = 0.45, 95% CI: 0.26-0.77). We suggest that this deletion may influence translational efficiency, thereby possibly affecting the development of bipolar affective disease.
Frank
Bernd
B
Institute of Human Genetics, University of Heidelberg, Heidelberg, Germany.
Niesler
Beate
B
Nöthen
Markus M
MM
Neidt
Helge
H
Propping
Peter
P
Bondy
Brigitta
B
Rietschel
Marcella
M
Maier
Wolfgang
W
Albus
Margot
M
Rappold
Gudrun
G
D020121:5' Untranslated Regions / Q000737:chemistry / Q000235:genetics; D000483:Alleles; D001483:Base Sequence; D001714:Bipolar Disorder / Q000235:genetics*; D004247:DNA / Q000737:chemistry / Q000235:genetics; D004252:DNA Mutational Analysis; D005192:Family Health; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation; D009690:Nucleic Acid Conformation; D020641:Polymorphism, Single Nucleotide; D044406:Receptors, Serotonin, 5-HT3 / Q000235:genetics*; D012559:Schizophrenia / Q000235:genetics*; D017384:Sequence Deletion
D020121:5' Untranslated Regions; D044406:Receptors, Serotonin, 5-HT3; D004247:DNA