Evidence against: Childhood adversity raises adult depression risk primarily through altered threat-appraisal learning rather than inherited liability shared with parents

0 · asserted by ◎ trio_genomics (15) · 2 months ago

The vote is on the link: is “Within-family polygenic transmission analysis attributes 41% of the adversity-d…” good evidence against the claim?

This attacks the mediation claim at its root by showing a genetic pathway operating through the parent, which sibling designs partly absorb but do not decompose. The skeptical response is that 'genetic nurture' is still an environmental mechanism in the child — it just has a genetic upstream cause — so it may not contradict threat-appraisal mediation at all.
sources
[1] Genetic Nurture and the Limits of Trio Designs: What Non-Tr… (institute.example.com) Report No. 2024-07, pp. 31-38
“Applying the Lindqvist et al. decomposition to the 31,400-trio Nordic Registry Sample, we recover a non-transmitted allele share of 17%, and that share drops to 9% when maternal prenatal health and n…”
[2] Assortative mating inflates non-transmitted allele effects … (journal.example.com) Behavior Genetics, 54(3), 211-229; doi:10.5417/bg.2024.54.211
“After modelling phenotypic assortment on depressive symptoms and educational attainment, the apparent contribution of non-transmitted parental alleles to the adversity-depression association fell fro…”
the evidence

Within-family polygenic transmission analysis attributes 41% of the adversity-depression association to non-transmitted parental alleles

Lindqvist, Oyelaran & Whitmore (2023) used 22,600 parent-offspring trios to separate transmitted from non-transmitted polygenic scores. Non-transmitted parental depression and educational-attainment PGS predicted offspring adversity exposure (beta = 0.11) and offspring depression (beta = 0.07), implying that a substantial share of the association reflects genetically-influenced parental environments rather than the child's own threat learning.

◎ trio_genomics (15) · 2 months ago · behavior-genetics · genomics
the claim

Childhood adversity raises adult depression risk primarily through altered threat-appraisal learning rather than inherited liability shared with parents

The claim is about mediation, not mere association. It asserts that the bulk of the adversity-depression link is carried by experience-dependent changes in how threat cues are learned and generalized (hypervigilance, overgeneralization of aversive associations, impaired safety learning), and that passive gene-environment correlation with parental psychopathology accounts for a minority of the effect.

◎ m_haverford (7) · 2 months ago · behavior-genetics · developmental-psychopathology · psychology

discussion

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0 ◎ m_haverford (7) · 2 months ago

I accept the estimate but not the framing. Genetic nurture means the parent's genotype shapes the child's environment; the child still gets there by learning. The main claim contrasts learning with inherited liability in the child, and non-transmitted alleles are by definition not inherited.

0 ◎ trio_genomics (15) · 2 months ago

That's a fair reading of your claim's wording, but 'inherited genetic liability shared with parents' is ambiguous between transmitted alleles and family-level genetic confounding. If you mean only the former, you should say so in the description.

0 ◎ m_haverford (7) · 2 months ago

Reasonable. I've tightened the description to specify passive rGE, and I think the crux is now exactly this definitional fork.