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Travis Mallard

@wakeworksleep.bsky.social
249 followers 176 following 3 posts

asst prof | clinical psychologist | some sort of geneticist | not a neuroscientist | mass general & harvard med | engagement ≠ endorsement

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Reposted by Travis Mallard
Joseph D. Deak, PhD @josephdeak.bsky.social · 19/08/2026
Join us in New Haven!
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Matt Rosenblatt @matt-rosenblatt.bsky.social · 17/07/2026
Pleased to share our new preprint: "Mapping the genetic architecture of human cortical expansion and its links to neuropsychiatric disorders" www.biorxiv.org/content/10.6...
biorxiv.org
Mapping the genetic architecture of human cortical expansion and its links to neuropsychiatric disorders
Cortical expansion is a defining feature of human evolution and neurodevelopment, involving the tangential growth and gyrification of the cerebral cortex. Although disruptions to the expansion of the ...
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Matt Rosenblatt @matt-rosenblatt.bsky.social · 17/07/2026
(10/15) Importantly, genome-wide genetic correlation only told part of the story. Using MiXeR, we found extensive shared polygenic architecture with many disorders—even when overall genetic correlation was small or absent.
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Matt Rosenblatt @matt-rosenblatt.bsky.social · 17/07/2026
(5/15) We then performed a multivariate GWAS of this cortical expansion factor. This identified: 🧬 48 genomic loci 🧬 30 effector genes 🧬 Multiple novel associations that were not genome-wide significant in any individual imaging phenotype.
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Travis Mallard @wakeworksleep.bsky.social · 13/07/2026
Pleased to share duckmapR, an R package offering perceptually uniform, CVD-accessible color maps inspired by my namesake 🦆 This started as a bit of a joke but turned into a fun (multi-)weekend project. Check it out at travismallard.github.io/duckmapR/!
Overview of duckmapR, showing its sequential, diverging, and categorical color maps, key accessibility features, and installation code.
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jdelafuente.bsky.social @jdelafuente.bsky.social · 05/06/2026
1/9 🚨 BREAKING OUT OF STEALTH MODE 🚨 Multivariate GWAS in Genomic SEM now runs on a laptop! New preprint + package update: a closed-form analytic solution makes multivariate GWAS ~800× faster, cutting runtimes from hours on HPC clusters to minutes on a personal computer.
static.klipy.com
The Predator Emerges
ALT: The Predator Emerges
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FinnGen @finngen.bsky.social · 03/06/2026
We are pleased to announce the release of FinnGen DF13 results! 🧬 While the number of participants remains unchanged, DF13 incorporates updated health register data, increasing the number of cases across most disease endpoints. Browsing & download instructions here: www.finngen.fi/en/access_re...
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Sam Lambert @iamslambert.bsky.social · 20/05/2026
Interested in applying multi-omics imputation or TWAS/PWAS approaches to your data? Frustrated by the models being spread across multiple resources? Enter OmicsPred: a centralised resource for genetic prediction of multi-omic traits! 🔗 : www.omicspred.org 📃 : www.medrxiv.org/content/10.6...
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Konrad @konradjk.bsky.social · 13/05/2026
🧬 New preprint! We present an All by All analysis in All of Us: common and rare variant association testing across 392,030 whole genomes and 3,602 phenotypes. 1.337 trillion tests, ~50k significant signals, all publicly browseable. www.medrxiv.org/content/10.6...
medrxiv.org
Systematic common and rare variant association testing in 392,030 whole genomes in All of Us
Large-scale genome-wide association studies (GWAS) and rare variant association studies (RVAS) from population biobanks provide valuable resources for gene discovery in complex human traits. We presen...
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Simon Hammann @simonhammann.bsky.social · 20/04/2026
Don't be shy to take on a little two-week side project. These five months will be the most precious three years of your academic journey.
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Armin Raznahan @bogglerapture.bsky.social · 09/03/2026
🚨🚨New work just out by the truly stellar Will Snyder - revealing rare and common genetic influences on complexity of human cortical folding !! 🚨🚨 👀 Will’s thread ⬇️ for deets, and to follow on @willsnyder.bsky.social Huge congrats to Will & thnx to fabulous collaborators who made this possible.
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Camille Michèle Williams @cognitivecamz.bsky.social · 11/02/2026
4/ With such a large and diverse sample, we identified many genes associated with externalizing: Across 1,294 genomic loci and 647 fine-mapped SNPs, we pinpointed 961 effector genes, including known biology (e.g., CADM2, BDNF) and novel discoveries (e.g., SLC17A6, NRN1)!
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Camille Michèle Williams @cognitivecamz.bsky.social · 11/02/2026
Our multi-ancestry GWAS of EXTernalizing conditions (ADHD, substance use...) in ~4M people reveals neurodevelopmental risk, drug-repurposing targets, and yields one of the strongest psychiatric polygenic indices yet! 🧬🎉 doi.org/10.64898/202...
doi.org
Genomic insights into substance use and disinhibitory disorders
Externalizing spectrum disorders- spanning attention-deficit/hyperactivity disorder, conduct disorder, substance use disorders, and other disorders characterized by disinhibition - frequently co-occur...
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Nature @nature.com · 12/11/2025
Nature research paper: Rare genetic variants confer a high risk of ADHD and implicate neuronal biology go.nature.com/3LARwjy
go.nature.com
Rare genetic variants confer a high risk of ADHD and implicate neuronal biology - Nature
An analysis of rare genetic variants identifies three genes—MAP1A, ANO8 and ANK2—that have a role in attention deficit hyperactivity disorder (ADHD) and investigates the potential underlying biological mechanisms.
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Andrew Grotzinger @andrewgrotzinger.bsky.social · 10/12/2025
1/4 Thrilled to be sharing new work published today in Nature describing the third wave of results from the PGC Cross-Disorder Group. This reflects a massive group effort to examine shared and unique genetic signal across >1 million cases for 14 psychiatric disorders. www.nature.com/articles/s41...
nature.com
Mapping the genetic landscape across 14 psychiatric disorders - Nature
Genomic analyses applied to 14 childhood- and adult-onset psychiatric disorders identifies five underlying genomic factors that explain the majority of the genetic variance of the individual disorders...
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loic-yengo.bsky.social @loic-yengo.bsky.social · 12/11/2025
First time on Bsky and first big announcement! I am excited to announce that our new study explaining the missing heritability of many phenotypes using WGS data from ~347,000 UK Biobank participants has just been published in @Nature. Our manuscript is here: www.nature.com/articles/s41....
nature.com
Estimation and mapping of the missing heritability of human phenotypes - Nature
WGS data were used from 347,630 individuals with European ancestry in the UK Biobank to obtain high-precision estimates of coding and non-coding rare variant heritability for 34 co...
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Nathan Bell @nateyates.bsky.social · 14/10/2025
When do machine learning models actually outperform standard polygenic scores? 🤔 In our new preprint, we benchmark how non-additive genetic effects (i.e, dominance deviations) shape polygenic prediction across simulated and UK Biobank traits. 👉 www.medrxiv.org/content/10.1... 🧵 1/6
medrxiv.org
Benchmarking non-additive genetic effects on polygenic prediction and machine learning-based approaches
Polygenic scores (PGSs) are widely used to translate genome-wide association study (GWAS) findings into tools for genetic risk prediction. Most current approaches assume additive effects, yet the cont...
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Joseph D. Deak, PhD @josephdeak.bsky.social · 24/09/2025
Some recent work led by @peterjonghona.bsky.social and myself at @yaleschoolofmed.bsky.social looks at environmental, psychiatric, and genetic predictors of alcohol use disorder. Online today at The American Journal of Psychiatry (@apapsychiatric.bsky.social): psychiatryonline.org/doi/10.1176/...
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Ted Schwaba @tedmond.bsky.social · 02/09/2025
I'm looking for a PhD student to do some trailblazing at the frontier of personality genomics and lifespan gene-environment transactions (start Fall 2026)! If you want to work with me: psychology.msu.edu/graduatestud... (PS @drmeltemyucel.bsky.social is taking a student too, in moral psych/dev!)
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W. Joel Schneider @w-joel-schneider.bsky.social · 20/08/2025
Now on CRAN, ggdiagram is a #ggplot2 extension that draws diagrams programmatically in #Rstats. Allows for precise control in how objects, labels, and equations are placed in relation to each other. wjschne.github.io/ggdiagram/ar...
An arrow with a LaTeX equationTrigonometric functions and a unit circleA bivariate change model with structured residualsA hierarchical model of cognitive abilities
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Jonathan Sebat @sebatlab.bsky.social · 16/07/2025
The field of neuroscience views the goal of human genetics as "finding genes". This is an outdated view. In whole genome studies of rare variants, finding genes is the easy part. The more interesting and important goal is to map out the causal pathway from genes to brain function to cognitive traits
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Gerome Breen @psychgenomics.bsky.social · 17/06/2025
Excited about our new preprint: 1st successful genome-wide study of >61,000 panic attack and 29,000 panic disorder cases. www.medrxiv.org/content/10.1... We find 17 associations & evidence that peripheral neurons in eye, lungs and heart are involved in panic & other psychiatric disorders 1/n
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Abdel Abdellaoui @dr-appie.bsky.social · 10/06/2025
Examining the sensitivity for environmental influences by conducting a GWAS on differences between identical twins - very clever design! Out now in @nathumbehav.nature.com : www.nature.com/articles/s41...
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Ted Schwaba @tedmond.bsky.social · 20/05/2025
Extremely excited to share the first effort of the Revived Genomics of Personality Consortium: A highly-powered, comprehensive GWAS of the Big Five personality traits in 1.14 million participants from 46 cohorts. www.biorxiv.org/content/10.1...
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Ted Schwaba @tedmond.bsky.social · 07/03/2025
Out today, our method for comparing multivariate genetic architecture across groups of people, called Genomic Structural Invariance: www.nature.com/articles/s41... (feat: @tuckerdrob.bsky.social @michelnivard.bsky.social @andrewgrotzinger.bsky.social @mijke.bsky.social @jorsmo.bsky.social et al.)
nature.com
Comparison of the multivariate genetic architecture of eight major psychiatric disorders across sex - Nature Genetics
Genomic structural invariance, an extension of genomic structural equation modeling, identifies similarities and differences between males and females in the genetic architectures of eight psychiatric...
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Mark James Adams @markjamesadams.bsky.social · 14/01/2025
New study from the @pgcgenetics.bsky.social: Multi-ancestry GWAS of MDD in over half a million cases and 4 million controls. www.cell.com/cell/fulltex...
cell.com
Trans-ancestry genome-wide study of depression identifies 697 associations implicating cell types and pharmacotherapies
Trans-ancestry GWAS of major depression identifies 697 genetic variants and 308 genes, implicating neural and molecular mechanisms and drug repurposing opportunities.
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Na Cai @caina89.bsky.social · 27/12/2024
Last work tweet of 2024 (maybe 😉): I, Ken Kendler, Brad Verhulst, @jorsmo.bsky.social and @andrewgrotzinger.bsky.social et al in the Psychiatric Genomics Consortium Cross Disorder Group (PGC-CDG) wrote a review on challenges studying cross disorder (psych) genetics: www.nature.com/articles/s41...
nature.com
Assessment and ascertainment in psychiatric molecular genetics: challenges and opportunities for cross-disorder research - Molecular Psychiatry
Molecular Psychiatry - Assessment and ascertainment in psychiatric molecular genetics: challenges and opportunities for cross-disorder research
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Caroline Wright @carolinefwright.bsky.social · 02/12/2024
Finally, the DDD outcomes paper is fully published - it took many people and many years, but we definitely had an impact on patient care! Genetic diagnoses changed management for >28% of patients, and connected families with support groups, key resources, and reproductive counseling bit.ly/3Zy0Dpq
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Emilie Wigdor @emiliewigdor.bsky.social · 20/11/2024
📣 Big news! Our tag-team effort on common variants in rare neurodevelopmental conditions is now out in Nature 📣 Co-first authoring with the brilliant Qinqin Huang🌟—proof that teamwork does make the dream work. 💪 www.nature.com/articles/s41...
media.tenor.com
a couple of cartoon characters standing next to each other with one wearing a purple earring
Alt: a couple of cartoon characters standing next to each other with one wearing a purple earring
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Graham Coop @gcbias.bsky.social · 19/11/2024
Just posting this to #popgen Here's a link to my notes on population & quantitative genetics: github.com/cooplab/popg... Hoping to extend it more after the winter holidays, as I'm just finishing up teaching the undergrad version of class.
github.com
Releases · cooplab/popgen-notes
Population genetics notes. Contribute to cooplab/popgen-notes development by creating an account on GitHub.
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Michel Nivard @michelnivard.bsky.social · 15/11/2024
Lots of new arrivals in the psychiatric and statistical genetics starterpack, time to browse it again to find your old friends go.bsky.app/9643dwo
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