Genetics & Epigenetics

Treatment-Resistant Depression Affected 34% in Pakistan DIVERGE Study

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Treatment-Resistant Depression Affected 34% in Pakistan DIVERGE Study

TL;DR: A 2026 preprint in medRxiv found that treatment-resistant depression affected 34% of medication-exposed major-depression patients in Pakistan’s DIVERGE study, with social support and CYP2C19 metabolizer status standing out as locally important treatment-response markers. Key Findings 3,677 eligible patients: The treatment-resistance analysis included adults with major depressive disorder who had medication exposure and enough adherence …

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PReDicT Antidepressant Algorithm Had Uncertain Cost-Effectiveness

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PReDicT Antidepressant Algorithm Had Uncertain Cost-Effectiveness

TL;DR: A 2026 study in BJPsych Open found that closely monitored antidepressant care improved quality of life and reduced societal costs in both PReDicT and usual-care groups, while the PReDicT algorithm added uncertain, country-dependent economic value. Key Findings Multinational trial data anchored the analysis: The economic evaluation followed 913 patients in France, Germany, the Netherlands, …

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Psilocybin AUD Trial Found Exploratory TLE4 and RASGRP4 Methylation Signals

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Psilocybin AUD Trial Found Exploratory TLE4 and RASGRP4 Methylation Signals

TL;DR: A 2026 exploratory study in Translational Psychiatry found blood DNA methylation changes after 25 mg psilocybin in detoxified alcohol use disorder patients, including findings near TLE4 and RASGRP4, but the small trial did not establish a definitive AUD biomarker. Key Findings 37 AUD patients: The methylation analysis used a randomized, double-blind psilocybin trial completed …

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Targeted PGx Testing Found Actionable Depression Drug-Gene Results

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Targeted PGx Testing Found Actionable Depression Drug-Gene Results

TL;DR: A 2026 study in The Pharmacogenomics Journal tested pharmacogenomic (PGx) depression care, meaning medication guidance based on drug-gene interactions; targeting Veterans already taking antidepressants with common PGx interactions raised the actionable-result rate to 30%, but immediate test-result access did not improve Patient Health Questionnaire-9 (PHQ-9) depression scores over 12 weeks. Key Findings 60 Veterans …

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MeCP2 Overexpression Disrupted Neural Progenitor Cells More Than Mature Neurons

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MeCP2 Overexpression Disrupted Neural Progenitor Cells More Than Mature Neurons

TL;DR: A 2026 Nature Communications study found that extra MeCP2, the dosage-sensitive protein linked to Rett syndrome and MECP2 duplication syndrome, disrupted neural progenitor cells far more than mature neurons by activating developmental genes too early. Key Findings Cell timing mattered: MeCP2 overexpression caused broad transcriptional changes in neural progenitor cells, but only modest changes …

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DNA Methylation Clock Ages Differed Across Saliva and Blood Samples

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DNA Methylation Clock Ages Differed Across Saliva and Blood Samples

TL;DR: A 2026 study in Epigenetics found that DNA methylation clocks, which estimate biological aging from chemical marks on DNA, gave substantially older age estimates in saliva than in two blood-derived samples from 91 early-to-mid-adult participants. Key Findings The sample included 91 adults: Researchers analyzed participants from a twin and sibling study with a mean …

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Rare OCD Variants in NPY5R, DLGAP1, and MAPK8IP3 Tracked in Two Families

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Rare OCD Variants in NPY5R, DLGAP1, and MAPK8IP3 Tracked in Two Families

TL;DR: A 2026 preprint in medRxiv used whole-genome sequencing in two families with many obsessive-compulsive disorder (OCD) cases and prioritized rare variants in NPY5R, DLGAP1, and MAPK8IP3, but the findings still need replication and functional testing. Key Findings Two densely affected families: Researchers sequenced 25 people from two multiplex OCD pedigrees, meaning families with several …

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CYP2C19 Metaboliser Status Linked to DNA Methylation Patterns

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CYP2C19 Metaboliser Status Linked to DNA Methylation Patterns

TL;DR: A 2026 methylome-wide study in Clinical Epigenetics found that genetically inferred CYP2C19 metaboliser status, a pharmacogenomic marker relevant to antidepressant handling, was associated with DNA methylation patterns in a large Scottish cohort. Key Findings 18,396-person discovery cohort: Generation Scotland supplied the main genetic and DNA methylation analysis for CYP2C19 metaboliser status. 48 quadratic CpG …

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Singing Mouse Orofacial Motor Cortex Showed 2.8-Fold and 3.3-Fold Expansion of Projections to Auditory Cortex and PAG

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Singing Mouse Orofacial Motor Cortex Showed 2.8-Fold and 3.3-Fold Expansion of Projections to Auditory Cortex and PAG

TL;DR: A 2026 mouse study in Nature mapped more than 76,000 single-neuron projections from the orofacial motor cortex (OMC) and found that Alston’s singing mouse, which produces audible song, has 2.8-fold higher OMC connectivity to an auditory cortical region and 3.3-fold higher OMC connectivity to the midbrain periaqueductal grey (PAG) than the laboratory mouse. Key …

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Prenatal Lead Exposure Linked to Lower Infant Neurodevelopment Scores

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Prenatal Lead Exposure Linked to Lower Infant Neurodevelopment Scores

TL;DR: A 2026 birth cohort study in Environment & Health linked low-level prenatal lead exposure to lower infant Ages and Stages Questionnaire (ASQ-3) developmental scores, with FAM50B/PTCHD3 DNA methylation markers explaining part of the association. Key Findings Lead was the clearest metal finding: Among 21 detectable cord-blood metals, lead showed a consistent negative association with …

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