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Nerve Injury and Regeneration / Neurotransmitter Receptor Influence on Behavior · Journal article
Brain Sciences · August 19, 2026
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This cross-sectional study of 271 Australian adults reports a complex three-way interaction between biological sex, 5-HTTLPR, and BDNF G196A genotypes on anxiety and anhedonia symptoms measured by self-report scales. The effect is highly specific to anxiety and anhedonic depression but not other depressive subtypes, and persists after controlling for cortisol, BMI, and substance use. The authors acknowledge modest subgroup sizes and explicitly call for replication in larger independent cohorts before these findings can inform clinical practice.
Cross-sectional community-based genetic association study. Community sample of Australian adults; genotyped for common 5-HTTLPR (short/long) and BDNF (G/A) variants; completed self-reported psychological measures.. Intervention: Genetic variants: 5-HTTLPR (short/long) and BDNF G196A polymorphisms. Compared with: Stratified analysis by genotype and biological sex; controlled for age and confounds. n = 271. Australia.
BDNF GA genotype exerted opposite effects on anxiety and anhedonia depending on sex and 5-HTTLPR background: in females, GA associated with increased symptoms on ss background; in males, GA associated with increased symptoms on ll background Effects were highly specific to anxiety and anhedonic depression; depressed mood, cognitive, and somatic subtypes remained unaffected Findings independent of morning salivary cortisol, BMI, smoking, alcohol use, and psychological resilience (CDRISC)
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This exploratory finding of sex-dependent genetic modulation of specific anxiety and anhedonia symptoms is hypothesis-generating but not yet ready for clinical translation. Clinicians should note the specificity to anhedonia and anxiety as potentially biologically distinct presentations, but await replication before incorporating genotyping into routine psychiatric assessment.
Single-centre community sample with modest subgroup sizes after stratification, exploratory three-way interaction analysis, and surrogate endpoints (self-reported symptoms); authors acknowledge need for replication in larger cohorts.
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This exploratory finding of sex-dependent genetic modulation of specific anxiety and anhedonia symptoms is hypothesis-generating but not yet ready for clinical translation. Clinicians should note the specificity to anhedonia and anxiety as potentially biologically distinct presentations, but await replication before incorporating genotyping into routine psychiatric assessment.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
BACKGROUND/OBJECTIVES: Depression and anxiety disorders exhibit significant clinical heterogeneity, which complicates diagnosis and treatment. This study investigated whether tripartite interactions between biological sex, the serotonin transporter gene promoter region (5-HTTLPR), and brain-derived neurotrophic factor (BDNF) G196A polymorphisms explain specific symptom-level variations. METHODS: A community sample of 271 Australian adults was genotyped for common 5-HTTLPR (short/long) and BDNF (G/A) variants. Participants completed self-reported measures of anxiety (SAS), depression subtypes (SDS; clinical content scales), and psychological resilience (CDRISC). Morning salivary cortisol, BMI, and substance use were assessed as potential confounds. Statistical analyses utilised a three-way factorial ANCOVA to test for interactions on raw scores, controlling for age. Significant omnibus interactions were decomposed via planned stratified ANCOVAs within each 5-HTTLPR stratum. RESULTS: The BDNF GA genotype exerted opposite effects on anxiety and anhedonia depending on sex and 5-HTTLPR background. In females, GA was associated with increased symptoms on an ss background, whereas in males, GA was associated with increased symptoms on an ll background. These effects were highly specific to anxiety and anhedonic depression, while depressed mood, cognitive, and somatic subtypes remained unaffected. Findings were independent of cortisol, BMI, smoking, alcohol use, and psychological resilience. CONCLUSIONS: The findings reveal a complex, sex-dependent genetic interaction that selectively influences anhedonia and anxiety. They should be interpreted in the context of modest subgroup sizes following genotype stratification and require replication in larger independent cohorts. Nonetheless, this study highlights the value of considering sex-stratified genetic backgrounds and symptom specificity to advance personalised precision medicine in psychiatry.
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