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A 2018 study broke neuroticism apart into its 12 individual questionnaire items and studied each one's genetics separately — "irritable mood" is one of them, and it turns out not to be genetically identical to the rest of neuroticism.
Most genetic studies of personality and mood measure a single composite score — for neuroticism, that usually means summing answers across a whole questionnaire into one number. Nagel et al. 2018 asked a different question: what if the individual items that make up that questionnaire aren't all measuring the same underlying genetics?
The study ran genome-wide association analyses on each of 12 individual neuroticism questionnaire items — including irritable mood — separately, across two UK Biobank samples (roughly 106,218 to 109,017 people in the first, 260,083 to 266,896 in the second), then combined the results in a meta-analysis. Genetic correlations between the 12 items ranged from 0.38 to 0.91 (average 0.63) — related to each other, as expected, but far from identical. The combined analysis found 255 genome-wide-significant independent genomic regions in total, and 138 of them were specific to just one item rather than shared broadly across all twelve. Clustering the items by their genetic correlations revealed two more genetically distinct groups within neuroticism, which the authors labelled "depressed affect" and "worry."
One of this page's variants, rs62055701, sits near CRHR1 (corticotropin-releasing hormone receptor 1) — a gene central to the body's hormonal stress-response system, and a thematically fitting neighbor for an irritability-specific genetic signal, though the paper does not single this locus out as irritable mood's strongest finding specifically.
The practical conclusion the authors draw is that "neuroticism," as usually measured and studied, is not one genetically uniform thing — it's a bundle of related but distinct items, and some of the biology only becomes visible when the items are examined one at a time instead of averaged together into a single score.
2026-05-25 · Genome-wide association study of positive and negative affect reveals shared genetic architecture and a potential causal relationship with cognition. Scientific Reports. 2026. DOI:10.1038/s41598-026-51734-1
Genetics suggests low cognitive ability may drive negative mood, not just the other way around
Positive and negative affect are narrower, more specific traits than the broader categories of depression or general wellbeing, which made them attractive targets for a first dedicated GWAS. Using the Lifelines Cohort Study (N=57,946 for affect, N greater than or equal to 35,729 for cognitive domains), this study found only 1 SNP reaching full genome-wide significance (for reaction time), with the rest of its findings at a suggestive level -- a modest yield reflecting how young this specific research angle is. The more substantive findings came from genetic correlation and bidirectional Mendelian randomization: negative and positive affect were genetically dissociable (rg=-0.18, confirming they are not simply opposite poles of one trait), and general cognitive ability (GCA) had much stronger genetic overlap with negative affect than positive affect. Mendelian randomization suggested higher GCA may causally reduce negative affect, depression and anxiety while increasing wellbeing -- and, in the reverse direction, that higher depression risk and lower wellbeing may themselves causally reduce GCA, suggesting a bidirectional rather than one-way relationship. Given the single genome-wide-significant hit and largely suggestive/correlational nature of the rest, this should be read as an early, hypothesis-generating study rather than an established finding; this site's irritable mood page carries 118 variants and this entry adds correlational context rather than a specific new causal variant.
This page is not about a mood disorder and does not diagnose irritability. "Irritable mood" here is one item from a personality questionnaire measuring a normal-range personality trait (neuroticism), answered by people from the general population — not a clinical symptom being assessed for a diagnosis, and none of these variants predict an individual's temperament or mood.
If irritability is severe, persistent, or distressing, or feels different from ordinary personality variation, that is a conversation for a doctor or mental health professional — not something addressed by a personality-questionnaire genetics study or by any variant on this page.
The studies behind these variants recruited participants from different ancestries — a result found in one population doesn't always transfer to another. Based on 208 of 208 linked studies with a resolved discovery ancestry.
Databases, guidelines and references
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Irritable Mood. MyGeneLog™. https://www.mygenelog.com/conditions/irritable-mood
It is one of 12 individual questionnaire items used to measure neuroticism, a normal-range personality trait — not a clinical diagnosis or symptom being assessed for one.
Studying up to roughly 375,000 UK Biobank participants combined, it analysed each of 12 neuroticism items' genetics separately rather than one composite score, finding 255 genome-wide-significant regions overall, 138 of them specific to just one item.
Largely yes — genetic correlations between the 12 items ranged from 0.38 to 0.91, meaning they are related but not genetically identical, and the study found genetic signal specific to individual items rather than shared across all of neuroticism.
No individual variant does. These are population-level statistical associations from a personality questionnaire, not individual predictions, and none is a diagnostic or clinical tool.
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