Child MTHFR C677T genotype and HPA stress regulation at 6 years of age
Bibliographic record
Abstract
Major depression is often characterized by elevated daily cortisol concentrations reflecting altered hypothalamic pituitary adrenal (HPA) regulation. A dysregulated maternal HPA axis may exert early programming effects on fetal HPA activity. The methylenetetrahydrofolate reductase ( MTHFR ) gene, an enzyme required for folate metabolism, has a variant (C677T) associated with depression. It remains unknown whether the C677T variant moderates the effect of antenatal maternal depression in shaping HPA function during early childhood. To study if an association between antenatal maternal mood and offspring HPA regulation may be moderated by C677T genotype, salivary cortisol concentrations were obtained from children (n=59) over four days [early morning awakening (mean 7:42 ± 0.91 h), 15 min later (8:02 ± .96 h), and evening (18:40 ± 2.35 h)]. Using a linear regression model, prenatal SRI antidepressant exposure, and maternal mood (Hamilton Depression Rating Scale) at 33 weeks and 6 years, did not predict cortisol concentrations. However, children with 677TT genotype (n=9) had higher evening cortisol concentrations (β=−0.384, P=0.004), and a smaller change from early morning to evening (β=0.292, P=0.037), compared to children with 677CC and CT. These data suggest that children with a MTHFR 677TT genotype have both elevated and altered diurnal cortisol patterns, possibly indicating HPA axis dysregulation. Supported by Canadian Institutes of Health Research, and the Human Early Learning Partnership.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".