Genetic contributions to brain serotonin transporter levels in healthy adults

The serotonin transporter (5-HTT) critically shapes serotonin neurotransmission by regulating extracellular brain serotonin levels; it remains unclear to what extent 5-HTT levels in the human brain are genetically determined. Here we applied [ 11 C]DASB positron emission tomography to image brain 5-...

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Vydáno v:Scientific reports Ročník 13; číslo 1; s. 16426 - 11
Hlavní autoři: Bruzzone, Silvia Elisabetta Portis, Nasser, Arafat, Aripaka, Sagar Sanjay, Spies, Marie, Ozenne, Brice, Jensen, Peter Steen, Knudsen, Gitte Moos, Frokjaer, Vibe Gedsoe, Fisher, Patrick MacDonald
Médium: Journal Article
Jazyk:angličtina
Vydáno: London Nature Publishing Group UK 30.09.2023
Nature Publishing Group
Nature Portfolio
Témata:
631/378/2583
631/378/2587
631/378/548/1964
Amygdala
Brain
Brain-derived neurotrophic factor
Genetic diversity
Genetic variance
Genotypes
Homozygotes
Humanities and Social Sciences
Mesencephalon
multidisciplinary
Neocortex
Neuroimaging
Neurotransmission
Positron emission tomography
Prediction models
Putamen
Science
Science (multidisciplinary)
Serotonin
Serotonin transporter
Statistical analysis
Thalamus
ISSN:2045-2322, 2045-2322
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Shrnutí:The serotonin transporter (5-HTT) critically shapes serotonin neurotransmission by regulating extracellular brain serotonin levels; it remains unclear to what extent 5-HTT levels in the human brain are genetically determined. Here we applied [ 11 C]DASB positron emission tomography to image brain 5-HTT levels and evaluated associations with five common serotonin-related genetic variants that might indirectly regulate 5-HTT levels ( BDNF rs6265, SLC6A4 5-HTTLPR, HTR1A rs6295, HTR2A rs7333412, and MAOA rs1137070) in 140 healthy volunteers. In addition, we explored whether these variants could predict in vivo 5-HTT levels using a five-fold cross-validation random forest framework. MAOA rs1137070 T-carriers showed significantly higher brain 5-HTT levels compared to C-homozygotes (2–11% across caudate, putamen, midbrain, thalamus, hippocampus, amygdala and neocortex). We did not observe significant associations for the HTR1A rs6295 and HTR2A rs7333412 genotypes. Our previously observed lower subcortical 5-HTT availability for rs6265 met-carriers remained in the presence of these additional variants. Despite this significant association, our prediction models showed that genotype moderately improved prediction of 5-HTT in caudate, but effects were not statistically significant after adjustment for multiple comparisons. Our observations provide additional evidence that serotonin-related genetic variants modulate adult human brain serotonin neurotransmission.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-023-43690-x