3 Key Takeaways
Plain English Summary- 01Core Finding
To model depression that begins before conception, female mice were subjected to social-isolation rearing (SIR) from weaning through gestation and lactation, and behavioural, neuroanatomical, and molecular outcomes were assessed in adult offspring of both sexes.
- 02Study Evidence
Tested in a in vivo animal model (preclinical discovery) at the preclinical stage.
- 03Practical Meaning
Together, these findings show that maternal stress beginning before pregnancy leaves a persistent imprint on offspring brain structure, microstructure, and epigenetic regulation, converging on the thalamus as a central hub of intergenerational vulnerability.
What This Means for You
Transcriptomic profiling of the thalamus revealed widespread, sex-dependent differences in gene expression, implicating pathways related to synaptic organization, protein synthesis, neuronal plasticity, and myelination. Exploratory DNA-methylation analyses identified nominal, sex-dependent pathway enrichments that did not survive false-discovery-rate correction. Together, these findings show that maternal stress beginning before pregnancy leaves a persistent imprint on offspring brain structure, microstructure, and epigenetic regulation, converging on the thalamus as a central hub of intergenerational vulnerability. This work establishes SIR as a translationally relevant model of depression that predates conception and provides integrated MRI- and molecular-level biomarkers for dissecting mechanisms and informing early preventive strategies.
The Discovery
Antenatal depression affects up to 20% of pregnancies worldwide and is associated with increased neuropsychiatric vulnerability in offspring, yet the enduring behavioural, neuroanatomical, and molecular features associated with maternal mood disturbance remain incompletely characterized. To model depression that begins before conception, female mice were subjected to social-isolation rearing (SIR) from weaning through gestation and lactation, and behavioural, neuroanatomical, and molecular outcomes were assessed in adult offspring of both sexes. Offspring of SIR dams exhibited robust anxiety-like behaviours across multiple paradigms. High-resolution ex vivo structural magnetic resonance imaging revealed reduced relative volumes of the thalamus and striatum, together with relative expansion of gustatory/visceral and visual cortices. Multivariate analyses identified a pattern of thalamostriatal and other regional volume differences that covaried with behavioural impairment. Diffusion tensor imaging further identified region-specific elevations in fractional anisotropy, consistent with persistent differences in brain microstructure.
How It Works, Simply
This psychiatry research focuses on blood biomarker (measurable biological signal) · Genetics · Signalling pathway. Researchers evaluated it using an in vivo animal model (Preclinical discovery) at the preclinical stage of medical research.
3 Key Takeaways
Clinical Takeaways- 01Core Finding
To model depression that begins before conception, female mice were subjected to social-isolation rearing (SIR) from weaning through gestation and lactation, and behavioural, neuroanatomical, and molecular outcomes were assessed in adult offspring of both sexes.
- 02Study Evidence
Tested in a in vivo animal model (preclinical discovery) at the preclinical stage.
- 03Practical Meaning
Together, these findings show that maternal stress beginning before pregnancy leaves a persistent imprint on offspring brain structure, microstructure, and epigenetic regulation, converging on the thalamus as a central hub of intergenerational vulnerability.
Biological Mechanism & Study Design
Study Design & Cohort
Animal models
In vivo animal model (Preclinical discovery) · Preclinical
Biological Pathway & Modality
Blood biomarker · Genetics · Signalling pathway
Intervention: A preconceptional stress model
Experimental Findings & Endpoints
Antenatal depression affects up to 20% of pregnancies worldwide and is associated with increased neuropsychiatric vulnerability in offspring, yet the enduring behavioural, neuroanatomical, and molecular features associated with maternal mood disturbance remain incompletely characterized.
To model depression that begins before conception, female mice were subjected to social-isolation rearing (SIR) from weaning through gestation and lactation, and behavioural, neuroanatomical, and molecular outcomes were assessed in adult offspring of both sexes. Offspring of SIR dams exhibited robust anxiety-like behaviours across multiple paradigms.
High-resolution ex vivo structural magnetic resonance imaging revealed reduced relative volumes of the thalamus and striatum, together with relative expansion of gustatory/visceral and visual cortices. Multivariate analyses identified a pattern of thalamostriatal and other regional volume differences that covaried with behavioural impairment.
Diffusion tensor imaging further identified region-specific elevations in fractional anisotropy, consistent with persistent differences in brain microstructure.
Clinical Translation & Practice Context
Transcriptomic profiling of the thalamus revealed widespread, sex-dependent differences in gene expression, implicating pathways related to synaptic organization, protein synthesis, neuronal plasticity, and myelination.
Exploratory DNA-methylation analyses identified nominal, sex-dependent pathway enrichments that did not survive false-discovery-rate correction. Together, these findings show that maternal stress beginning before pregnancy leaves a persistent imprint on offspring brain structure, microstructure, and epigenetic regulation, converging on the thalamus as a central hub of intergenerational vulnerability.
This work establishes SIR as a translationally relevant model of depression that predates conception and provides integrated MRI- and molecular-level biomarkers for dissecting mechanisms and informing early preventive strategies.
The Bottom Line · Clinical Pearl
“This work establishes SIR as a translationally relevant model of depression that predates conception and provides integrated MRI- and molecular-level biomarkers for dissecting mechanisms and informing early preventive strategies.”
Published in Molecular Psychiatry · Current Stage: Preclinical