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Updated: Jul 7, 2026
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Rapid In Situ Hybridization using Oligonucleotide Probes on Paraformaldehyde-prefixed Brain of Rats with Serotonin Syndrome
Published on: September 23, 2015
The 5-HT2A receptor binding pattern in the human brain is strongly genetically determined
Lars H Pinborg1, Haroon Arfan, Steven Haugbol
1Neurobiology Research Unit and Center for Integrated Molecular Brain Imaging, Copenhagen University Hospital, Rigshospitalet, N9201, 9 Blegdamsvej, DK-2100 Copenhagen, Denmark. pinborg@nru.dk
Neuroimage
|February 23, 2008
Summary
Genetic factors significantly influence serotonin 2A receptor binding in the human brain. Environmental influences play a limited role in individual differences of these important neurotransmission markers.
Area of Science:
- Neuroscience
- Psychiatry
- Genetics
Background:
- Positron emission tomography (PET) allows in vivo brain imaging of neurotransmission markers.
- While brain anatomy is largely genetic, the influence of genes and environment on neuromodulatory markers is unclear.
- Serotonin 2A (5-HT(2A)) receptors are implicated in neuropsychiatric disorders, with known genetic associations.
Purpose of the Study:
- To investigate the genetic and environmental contributions to individual differences in cortical 5-HT(2A) receptor binding.
- To quantify the heritability and environmental influences on 5-HT(2A) receptor availability using PET imaging.
Main Methods:
- Utilized a classical twin design with 24 healthy male subjects (monozygotic and dizygotic twin pairs).
- Measured cortical 5-HT(2A) receptor binding using [(18)F]altanserin PET imaging.
- Applied multivariate analysis (ACE model) to estimate genetic (A), shared environmental (C), and non-shared environmental (E) effects.
Main Results:
- High intraclass correlation coefficients were observed for both dizygotic (0.67) and monozygotic (0.87) twin pairs.
- The variance attributed to non-shared environmental factors was less than 10% in the analysis.
- Heritability estimates indicated a substantial genetic influence on 5-HT(2A) receptor binding.
Conclusions:
- Cortical 5-HT(2A) receptor binding is predominantly influenced by genetic factors.
- Individual-specific environmental factors have a limited impact on variations in 5-HT(2A) receptor availability.
- These findings contribute to understanding the etiology of neuropsychiatric disorders linked to serotonin pathways.
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