Exploring the Roles of 5-HTTLPR, STin2, 5-HT2A, and TPH2 Variants in Heroin Dependence
Bibliographic record
Abstract
Abstract Background: Substance abuse is a major worldwide public health and social problem. The serotonergic system, specifically the serotonin transporter (5-HTT) and postsynaptic activation of the serotonin 2A receptor (5-HT2A), may play a relevant role in substance dependence. This study investigated the association of 5-HTTLPR, serotonin transporter intron 2 (STin2), 5-HT2A, and tryptophan hydroxylase 2 (TPH2) variants with heroin dependence and determined genetic predispositions to heroin dependence and heroin co-occurring disorders. Methods: This study comprised 36 case and 24 control subjects. All participants completed self-reported questionnaires which included items regarding demographic information, the Chinese Health Questionnaire (CHQ), Eysenck Personality Inventory, Parental Bonding Instrument, and the Taiwanese version of the Toronto Alexithymia Scale-20. Heroin-dependent subjects underwent further examinations including hepatitis B virus, hepatitis C virus, and venereal disease research laboratory tests. Genomic DNA was extracted from 3.5 mL of peripheral blood in all participants for genotyping of 5-HTTLPR, STin2, 5-HT2A, and TPH2. Results: The heroin-dependent subjects were older than the control subjects (t=19.091, p<0.001). Statistically significant differences in education level (t=83.66, p<0.001), sex distribution (χ2=32.642, p<0.001), marriage status (χ2=6.705, p=0.035), and smoking status (χ2=60.00, p<0.001) were observed between heroin-dependent and control subjects. The CHQ score in the heroin-dependent subjects was higher than that in the control group (t=20.944, p<0.001). Statistically significant differences in father care (t=5.031, p=0.029) and father protection (t=4.170, p=0.046) distributions were observed between heroin-dependent and control subjects. Conclusions: Older males, divorced subjects, and smokers had higher risks of heroin dependence, while subjects who received more education had a lower risk of heroin dependence. Heroin-dependent subjects had higher CHQ scores and lower father care and higher father protection.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.006 | 0.024 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.004 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.004 | 0.010 |
| Research integrity | 0.000 | 0.009 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".