Jeff Groh
@jeffgroh.bsky.social
Postdoc at UC Berkeley | evolutionary genetics & genomics, plant mating systems, hybridization
Reposted by Jeff Groh
With @aconga.bsky.social we wrote a short Dispatch to highlight two awesome companion papers in @currentbiology.bsky.social by @jeffgroh.bsky.social, @gcbias.bsky.social and by Liu et al. on how the control of heterodichogamy is going nuts in the Juglandaceae :
www.cell.com/current-biol...
www.cell.com/current-biol...
November 5, 2025 at 8:00 AM
With @aconga.bsky.social we wrote a short Dispatch to highlight two awesome companion papers in @currentbiology.bsky.social by @jeffgroh.bsky.social, @gcbias.bsky.social and by Liu et al. on how the control of heterodichogamy is going nuts in the Juglandaceae :
www.cell.com/current-biol...
www.cell.com/current-biol...
Reposted by Jeff Groh
Hermaphroditic plants also use TIME ⏰🌿 to avoid selfing.
Two new @currentbiology.bsky.social papers explore the rapid turnover of this trait in the wingnut family.
Both @vincentcastric.bsky.social and I summarized these findings 👉 authors.elsevier.com/a/1m2MA3QW8S...
#Evolution #PlantBiology
Two new @currentbiology.bsky.social papers explore the rapid turnover of this trait in the wingnut family.
Both @vincentcastric.bsky.social and I summarized these findings 👉 authors.elsevier.com/a/1m2MA3QW8S...
#Evolution #PlantBiology
November 4, 2025 at 7:30 PM
Hermaphroditic plants also use TIME ⏰🌿 to avoid selfing.
Two new @currentbiology.bsky.social papers explore the rapid turnover of this trait in the wingnut family.
Both @vincentcastric.bsky.social and I summarized these findings 👉 authors.elsevier.com/a/1m2MA3QW8S...
#Evolution #PlantBiology
Two new @currentbiology.bsky.social papers explore the rapid turnover of this trait in the wingnut family.
Both @vincentcastric.bsky.social and I summarized these findings 👉 authors.elsevier.com/a/1m2MA3QW8S...
#Evolution #PlantBiology
Reposted by Jeff Groh
Congratulations to @jeffgroh.bsky.social on the publication of his paper on an ancient balanced polymorphisms controlling heterodichogamy in two genera of wingnuts. The paper shows the putative turnover & reversal of dominance of a mating type polymorphism
www.sciencedirect.com/science/arti...
www.sciencedirect.com/science/arti...
Distinct haplotypes and reversed dominance at a single-gene balanced polymorphism controlling heterodichogamy in two genera of wingnuts
In the angiosperm mating system of heterodichogamy, two hermaphroditic morphs temporally alternate between male and female flowering phases, promoting…
www.sciencedirect.com
October 16, 2025 at 3:42 PM
Congratulations to @jeffgroh.bsky.social on the publication of his paper on an ancient balanced polymorphisms controlling heterodichogamy in two genera of wingnuts. The paper shows the putative turnover & reversal of dominance of a mating type polymorphism
www.sciencedirect.com/science/arti...
www.sciencedirect.com/science/arti...
Sharing our new paper, "Distinct haplotypes and reversed dominance at a single-gene balanced polymorphism controlling heterodichogamy in two genera of wingnuts". Genomics & evolution of a mating type system involving two morphs with alternating sexes in walnut relatives www.cell.com/current-biol...
Distinct haplotypes and reversed dominance at a single-gene balanced polymorphism controlling heterodichogamy in two genera of wingnuts
In most species within the walnut family, two genetically determined morphs alternate
between male and female flowering phases in time. Groh et al. identify a distinct
locus for this dimorphism in two...
www.cell.com
October 16, 2025 at 3:43 PM
Sharing our new paper, "Distinct haplotypes and reversed dominance at a single-gene balanced polymorphism controlling heterodichogamy in two genera of wingnuts". Genomics & evolution of a mating type system involving two morphs with alternating sexes in walnut relatives www.cell.com/current-biol...
Reposted by Jeff Groh
We're excited to be recruiting an NIH funded postdoc to work in the Coop lab at UC Davis. We're specifically interested in candidates who are want to work at the intersection of human genetics, GWAS, and population genetics modeling. Please RT
October 15, 2025 at 3:53 PM
We're excited to be recruiting an NIH funded postdoc to work in the Coop lab at UC Davis. We're specifically interested in candidates who are want to work at the intersection of human genetics, GWAS, and population genetics modeling. Please RT
Work led by Marius Roesti, "A species interaction kick-starts ecological speciation in allopatry" now published - Varying degrees of divergence associated with presence/absence of a single interacting species predicts strength of prezygotic RI in freshwater stickleback www.pnas.org/doi/10.1073/...
A species interaction kick-starts ecological speciation in allopatry | PNAS
Adaptation to different environments is thought to play a key role in speciation.
However, speciation typically begins in allopatry, where reproduc...
www.pnas.org
October 14, 2025 at 2:12 AM
Work led by Marius Roesti, "A species interaction kick-starts ecological speciation in allopatry" now published - Varying degrees of divergence associated with presence/absence of a single interacting species predicts strength of prezygotic RI in freshwater stickleback www.pnas.org/doi/10.1073/...
Reposted by Jeff Groh
New Article: "Ginger genome reveals the SMPED1 gene causing sex-phase synchrony and outcrossing in a flowering plant" rdcu.be/eJPdX
SMPED1, located in a dichogamy-determining region in Alpinia species, controls the timing of sex-organ synchrony.
SMPED1, located in a dichogamy-determining region in Alpinia species, controls the timing of sex-organ synchrony.
October 7, 2025 at 11:07 AM
New Article: "Ginger genome reveals the SMPED1 gene causing sex-phase synchrony and outcrossing in a flowering plant" rdcu.be/eJPdX
SMPED1, located in a dichogamy-determining region in Alpinia species, controls the timing of sex-organ synchrony.
SMPED1, located in a dichogamy-determining region in Alpinia species, controls the timing of sex-organ synchrony.
Reposted by Jeff Groh
Quantitative system drift https://www.biorxiv.org/content/10.1101/2025.09.17.676933v1
September 20, 2025 at 4:32 PM
Quantitative system drift https://www.biorxiv.org/content/10.1101/2025.09.17.676933v1
Reposted by Jeff Groh
Please share broadly: I am looking for a postdoctoral fellow to work on a collaborative project on the temporal population genomics of invasive Capeweed (using contemporary and herbarium genomics), with @shaky-dingo.bsky.social and colleagues
August 27, 2025 at 12:09 PM
Please share broadly: I am looking for a postdoctoral fellow to work on a collaborative project on the temporal population genomics of invasive Capeweed (using contemporary and herbarium genomics), with @shaky-dingo.bsky.social and colleagues
Reposted by Jeff Groh
Excited to share our new preprint for the tskit_arg_visualizer Python package! ARGs can sometimes feel like a black box, so
@yanwong.bsky.social and I have been developing a method to programmatically drawing these graphs.
🔗 arxiv.org/abs/2508.03958
1/6
@yanwong.bsky.social and I have been developing a method to programmatically drawing these graphs.
🔗 arxiv.org/abs/2508.03958
1/6
tskit_arg_visualizer: interactive plotting of ancestral recombination graphs
Summary: Ancestral recombination graphs (ARGs) are a complete representation of the genetic relationships between recombining lineages and are of central importance in population genetics. Recent brea...
arxiv.org
August 19, 2025 at 2:12 PM
Excited to share our new preprint for the tskit_arg_visualizer Python package! ARGs can sometimes feel like a black box, so
@yanwong.bsky.social and I have been developing a method to programmatically drawing these graphs.
🔗 arxiv.org/abs/2508.03958
1/6
@yanwong.bsky.social and I have been developing a method to programmatically drawing these graphs.
🔗 arxiv.org/abs/2508.03958
1/6
Reposted by Jeff Groh
Fields like Computer Science, Physics/Astronomy, and Chemistry saw the largest increases in NSF GRFP awards in 2025.
Meanwhile, Life Sciences, Social Sciences, Psychology, and Mathematical Sciences experienced the steepest declines—marking a major departure from historical funding patterns.
Meanwhile, Life Sciences, Social Sciences, Psychology, and Mathematical Sciences experienced the steepest declines—marking a major departure from historical funding patterns.
June 26, 2025 at 4:32 PM
Fields like Computer Science, Physics/Astronomy, and Chemistry saw the largest increases in NSF GRFP awards in 2025.
Meanwhile, Life Sciences, Social Sciences, Psychology, and Mathematical Sciences experienced the steepest declines—marking a major departure from historical funding patterns.
Meanwhile, Life Sciences, Social Sciences, Psychology, and Mathematical Sciences experienced the steepest declines—marking a major departure from historical funding patterns.
Looking forward to #Evol2025! I’ll be presenting on the genetics of a balanced polymorphism for sex timing in hermaphroditic plants in the Reproductive Systems session on June 22 at 11:15 AM
June 20, 2025 at 12:09 AM
Looking forward to #Evol2025! I’ll be presenting on the genetics of a balanced polymorphism for sex timing in hermaphroditic plants in the Reproductive Systems session on June 22 at 11:15 AM
Reposted by Jeff Groh
How bad will it be? Catastrophic.
Proposed cuts to #NSF, #NIH, and #NASA will set the US R&D landscape back 25 yrs+, cause economic and job loss now, and undermine innovations to come.
But, this is the WH's *proposed* budget.
Speak up now before it is too late.
(inflation adjusted $-s below)
Proposed cuts to #NSF, #NIH, and #NASA will set the US R&D landscape back 25 yrs+, cause economic and job loss now, and undermine innovations to come.
But, this is the WH's *proposed* budget.
Speak up now before it is too late.
(inflation adjusted $-s below)
May 31, 2025 at 2:50 AM
Reposted by Jeff Groh
1/9 Excited to share the preprint for the second half of my PhD with @mollyschumer.bsky.social: Connecting human environmental impacts to hybridization in swordtail fish through genomics, GIS, water chemistry, and histology. Thread below!
#SciSky
www.biorxiv.org/content/10.1...
#SciSky
www.biorxiv.org/content/10.1...
Increased rates of hybridization in swordtail fish are associated with water pollution
Biodiversity loss can occur when disturbance compromises the reproductive barriers between species, causing them to collapse into a single population through hybridization. Recent research has documen...
www.biorxiv.org
May 1, 2025 at 1:15 PM
1/9 Excited to share the preprint for the second half of my PhD with @mollyschumer.bsky.social: Connecting human environmental impacts to hybridization in swordtail fish through genomics, GIS, water chemistry, and histology. Thread below!
#SciSky
www.biorxiv.org/content/10.1...
#SciSky
www.biorxiv.org/content/10.1...
Congrats to my wonderful PhD advisor @gcbias.bsky.social on being elected to American Academy of Arts & Sciences! www.amacad.org/new-members-...
New Academy Members
Elected in 2025
www.amacad.org
April 24, 2025 at 4:58 PM
Congrats to my wonderful PhD advisor @gcbias.bsky.social on being elected to American Academy of Arts & Sciences! www.amacad.org/new-members-...
Reposted by Jeff Groh
Biologist Jeff Groh wrote home to Hummelstown PA 🚜 to lay out the many costs of cuts to American science infrastructure. “Let’s not ruin a good thing” 🧪🏠
Inspired by others on here I wrote a short op-ed in support of federal research funding for a local newspaper in small town PA where I grew up
April 10, 2025 at 8:39 PM
Biologist Jeff Groh wrote home to Hummelstown PA 🚜 to lay out the many costs of cuts to American science infrastructure. “Let’s not ruin a good thing” 🧪🏠
Inspired by others on here I wrote a short op-ed in support of federal research funding for a local newspaper in small town PA where I grew up
April 10, 2025 at 8:19 PM
Inspired by others on here I wrote a short op-ed in support of federal research funding for a local newspaper in small town PA where I grew up
Reposted by Jeff Groh
More than 1,200 demonstrations were held across the country on Saturday against the policies and actions of President Donald Trump and Elon Musk. See images from some of the protests in California, Florida, Washington, D.C., and more.
Photos: Nationwide Protests Against Trump and Musk
Images from some of the hundreds of anti-Trump demonstrations across the country.
bit.ly
April 6, 2025 at 8:15 PM
More than 1,200 demonstrations were held across the country on Saturday against the policies and actions of President Donald Trump and Elon Musk. See images from some of the protests in California, Florida, Washington, D.C., and more.
Reposted by Jeff Groh
We would love feedback on a new NCBI-BLAST service we are launching today: sky-blast.com
Under the hood it's the same BLAST executable and databases provided by NCBI, with a replica of the NIH's interface - providing an alternative to the US gov service that's less congested, faster & more reliable
Under the hood it's the same BLAST executable and databases provided by NCBI, with a replica of the NIH's interface - providing an alternative to the US gov service that's less congested, faster & more reliable
March 11, 2025 at 11:50 PM
We would love feedback on a new NCBI-BLAST service we are launching today: sky-blast.com
Under the hood it's the same BLAST executable and databases provided by NCBI, with a replica of the NIH's interface - providing an alternative to the US gov service that's less congested, faster & more reliable
Under the hood it's the same BLAST executable and databases provided by NCBI, with a replica of the NIH's interface - providing an alternative to the US gov service that's less congested, faster & more reliable
I'm excited to share our new preprint on the molecular evolution of heterodichogamy in two wingnut genera of Juglandaceae. Heterodichogamy features two morphs synchronously alternating male and female flowering phases in time to generate disassortative mating.
doi.org/10.1101/2025...
doi.org/10.1101/2025...
March 11, 2025 at 5:34 PM
I'm excited to share our new preprint on the molecular evolution of heterodichogamy in two wingnut genera of Juglandaceae. Heterodichogamy features two morphs synchronously alternating male and female flowering phases in time to generate disassortative mating.
doi.org/10.1101/2025...
doi.org/10.1101/2025...
Reposted by Jeff Groh
Allelic turnover and dominance reversal at a single-gene balanced polymorphism controlling heterodichogamous flowering in wingnuts (Juglandaceae) https://www.biorxiv.org/content/10.1101/2025.03.10.642504v1
March 11, 2025 at 12:31 PM
Allelic turnover and dominance reversal at a single-gene balanced polymorphism controlling heterodichogamous flowering in wingnuts (Juglandaceae) https://www.biorxiv.org/content/10.1101/2025.03.10.642504v1
Reposted by Jeff Groh
WHERE WILL YOU BE TOMORROW?
March 6, 2025 at 3:11 PM
WHERE WILL YOU BE TOMORROW?
Reposted by Jeff Groh
1/10 *** New paper out *** (on behalf of Nick Peoples who is not on Bluesky). I am beyond excited to present our new paper out now in @Nature! Here, we show that rapid gain and loss of tooth complexity accelerates diversification in fishes! www.nature.com/articles/s41...
Evolutionary lability of a key innovation spurs rapid diversification - Nature
A study shows that the rapid diversification of cichlids in African lakes is driven by their ability to evolve between having simple or complex teeth.
www.nature.com
March 4, 2025 at 5:32 AM
1/10 *** New paper out *** (on behalf of Nick Peoples who is not on Bluesky). I am beyond excited to present our new paper out now in @Nature! Here, we show that rapid gain and loss of tooth complexity accelerates diversification in fishes! www.nature.com/articles/s41...
This one hits close to home. Rachel was one of the collections managers for a nat'l germplasm repository in Winters, CA where I've done a lot of my research. Invaluable resource that that will take a big hit from this www.nytimes.com/2025/03/02/u...
Horticulturalists, Biologists, Engineers: Federal ‘Bloat’ or Valued Experts?
President Trump’s effort to remake the government is a direct challenge to a decades-long effort to build a civil service stocked with experts. Critics say it will backfire.
www.nytimes.com
March 2, 2025 at 5:27 PM
This one hits close to home. Rachel was one of the collections managers for a nat'l germplasm repository in Winters, CA where I've done a lot of my research. Invaluable resource that that will take a big hit from this www.nytimes.com/2025/03/02/u...
Reposted by Jeff Groh
I usually reserve this account for my personal views; but today I want to represent my position as President of @asn-amnat.bsky.social to post a message that will shortly go out to the membership of the American Society of Naturalists from the ASN Executive Council
February 6, 2025 at 4:28 PM
I usually reserve this account for my personal views; but today I want to represent my position as President of @asn-amnat.bsky.social to post a message that will shortly go out to the membership of the American Society of Naturalists from the ASN Executive Council