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Prajna Hebbar

@prajnahebbar.bsky.social
355 followers 250 following 6 posts

PhD Candidate, Computational Genomics Lab UC Santa Cruz.

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Reposted by Prajna Hebbar
jakobheinz.bsky.social @jakobheinz.bsky.social · 01/10/2026
I’m excited to share our new preprint introducing HipHap, a tool for assigning long reads to haplotype-resolved diploid reference assemblies! With Max Marin, Matthew Meyerson, and @lh3lh3.bsky.social Preprint: www.biorxiv.org/content/10.6... 🧵 1/6
biorxiv.org
HipHap: Haplotype Assignment and Confidence Scoring for Diploid Reference Genomes
Diploid genome assemblies are now routinely available, but most read aligners were designed for haploid references, which have long been the gold standard. When reads are aligned to a diploid assembly...
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Cedric Feschotte @cedricfeschotte.bsky.social · 24/09/2026
Thrilled to see this published today! Truly special because we made the initial discovery >15 yrs ago! We found two copies of a human gene called BC200 embedded in a human poxvirus. BC200 blurs the line between gene & transposon—both functional & mutagenic! www.science.org/doi/10.1126/... 🧵1/n
science.org
Escape of the BC200 gene to a human poxvirus reveals its persistent transposition in primates
Transposable elements mobilize within and occasionally between genomes, including from host to virus. We identified two insertions of the human BC200 noncoding RNA gene in the poxvirus molluscum conta...
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Human Pangenome Reference Consortium @humanpangenome.bsky.social · 24/09/2026
Shredtools is making it easier to explore regions across a pangenome by quickly finding matching genomic regions across hundreds of genomes. The tool can identify a gene region across 476 human genomes in approximately half a second.  Read more: www.biorxiv.org/content/10.6...
biorxiv.org
Navigating the pangenome coordinate system with Shredtools
Existing notions of pangenome coordinates rely on hard-to-compute multiple sequence alignments. On the other hand, pangenome-wide exact unique matches (multi-MUMs) can be computed efficiently, and rep...
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Baskin Engineering at UC Santa Cruz @baskinengineering.bsky.social · 18/09/2026
"We are probably looking at the strongest El Niño in our recorded lifetime," said #BaskinEngineering Professor of Statistics Robert Lund. This could bring sea level changes, beach erosion, damaged harbors, and inland flooding caused by heavy rainstorms. Via @ksbw.bsky.social: bit.ly/3V26CDh
bit.ly
Central Coast braces for heavy rain as strong El Niño approaches
Central Coast officials are preparing for a potentially wet winter as a strong El Niño is expected to bring heavy rain, flooding, and other impacts to the region.
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Reposted by Prajna Hebbar
Pookleblinky @pookleblinky.bsky.social · 20/03/2026
en.wikipedia.org/wiki/Plastic... Asphalt and aluminum meanwhile actually do get recycled. 99% of all asphalt in the US is recycled. 75% of all aluminum ever mined, is still in use via recycling. Plastic basically doesn't get recycled.
en.wikipedia.org
Plastic recycling - Wikipedia
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Pookleblinky @pookleblinky.bsky.social · 20/03/2026
Fun fact: plastic recycling basically doesn't exist. Only about 9% of all plastic ever made has been recycled, and only 1% more than once. www.npr.org/2022/10/24/1...
npr.org
Recycling plastic is practically impossible — and the problem is getting worse
A new report from Greenpeace found that people may be putting plastic into recycling bins — but almost none of it is actually being recycled. Meanwhile, plastic production is ramping up.
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bioRxiv Genomics @biorxiv-genomic.bsky.social · 16/09/2026
PRDM9-mediated meiotic hotspot specification is constrained in humans despite extensive sequence diversity www.biorxiv.org/content/10.64898/20…
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bioRxiv Genomics @biorxiv-genomic.bsky.social · 05/09/2026
Pangenome alignment reveals global diversity and evolution of human centromeric regions www.biorxiv.org/content/10.64898/20…
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Tony Gamble @tonygamble.eurosky.social · 27/08/2026
New collaborative paper from the lab on gecko sex chromosome and genome evolution! 🧪🦎 www.science.org/doi/10.1126/...
science.org
Genomic predisposition is associated with the direction of sex chromosome evolution
Sex chromosome evolution is among the most dynamic genomic innovations in vertebrates, yet why some lineages evolve XY while others evolve ZW remains unclear. Using chromosome-level genomes from 19 ge...
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anil oza @aniloza.bsky.social · 07/08/2026
NIH is planning on revoking eligibility for international students on visas for the K99/R00 pathway, a key program that supports postdocs in establishing their own labs www.statnews.com/2026/08/07/n...
statnews.com
NIH plans to block international researchers on visas from accessing key funding avenue
The NIH plans to close the door on one of the few pathways available to international students on visas to forge a career in biomedical research in the U.S.
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Baskin Engineering at UC Santa Cruz @baskinengineering.bsky.social · 06/08/2026
Big news in genomics! #BaskinEngineering Ph.D. student @prajnahebbar.bsky.social led the complete sequencing of the DNA of a common marmoset. 🧬 “Now, we have this really complete, high-quality resource that people can take advantage of," she said. Via The Scientist: bit.ly/4q1O9C3
bit.ly
Complete Reference Genomes Set New Genomics Milestones | The Scientist
Advances in genome assembly methods helped researchers complete reference genomes for humans, marmosets, songbirds, and more, accelerating genomic research.
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Cell - a Cell Press journal @cp-cell.bsky.social · 06/08/2026
New issue alert👉https://cell.com/cell/current On the cover: The Telomere-to-Telomere Consortium has finished the complete, diploid genome of a person. The cover is inspired by a karyotype of the chromosomes in metaphase, representing the two haplotypes as different colors.
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UC Santa Cruz Genomics Institute @ucscgenomics.bsky.social · 06/08/2026
We’ve sequenced a marmoset! Grad student @prajnahebbar.bsky.social & @benedictpaten.bsky.social led the effort, and expect it to enable scientists to learn more about genes that contribute to memory loss and Alzheimer's. 🔗https://news.ucsc.edu/2026/08/first-complete-marmoset-genome/
A quote from Prajna Hebbar, graduate student at UC Santa Cruz and lead author on the T2T marmoset paper, reads "Routine T2T genomics is making findings easier... It's great to be in an era where we're not stuck with the technical problems- we can go into the biology and make discoveries relevant to human health." A small monkey is pictured on the side.
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Adam Phillippy @aphillippy.bsky.social · 06/08/2026
For the past 30 years, “whole-genome sequencing” has been a misnomer. Today the T2T Consortium publishes a dozen papers heralding a future of truly complete genomes for humans and nearly any vertebrate 👨‍🔬🐒🐦🐀🦒🐎🫏🐹🐟 (sorry, no salamanders): www.cell.com/consortium/t... 🧵[1/15]
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Carl Zimmer @carlzimmer.com · 22/07/2026
Did Thoreau encounter contagious cancer? A new study finds transmissible tumors in catfish--and raises questions about whether they could arise in humans someday. Gift link: nyti.ms/4whfi6v
nyti.ms
Deep in This Lake, a Contagious Cancer Is Spreading (Gift Article)
Transmissible tumors have been reported in a handful of animal species, but never before among fish. Is it possible in humans?
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Alexander Lees @alexanderlees.bsky.social · 13/07/2026
Our new commentary rdcu.be/ftx6h in @natecoevo.nature.com written with folks from @inaturalist.bsky.social and @cornellbirds.bsky.social shows that use of AI to manipulate existing or create new wildlife images undermines the huge value of vast citizen science databases. 🌍🪰🪶 #Ornithology 🧵 1/10
rdcu.be
Citizen science platforms must mitigate against the threat of generative AI
Nature Ecology & Evolution - Citizen science platforms must mitigate against the threat of generative AI
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Nicholas Bellono @nbellono.bsky.social · 09/07/2026
How did octopuses evolve novel traits? Rishav Mitra, Richard Han, Trey Scott, et al serendipitously discover a unique ribosome adaptation that increases the accuracy of protein synthesis and evolved alongside their elaborate nervous systems vs deep sea relatives. www.biorxiv.org/content/10.6...
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Vertebrate Genomes Project @vertebrategenomes.bsky.social · 06/07/2026
🚨 MANUSCRIPT ALERT 🚨 The VGP Phase I manuscript pre-print is now live on bioRxiv! 🧬 doi.org/10.64898/202... Over 8 years, the VGP generated reference genomes for more than 800 vertebrate species, spanning ~95% of vertebrate orders and delivering some of the highest-quality genomes ever produced.
A graphic announcing the release of the Vertebrate Genomes Project Phase 1 manuscript on bioRxiv with drawings of various vertebrate creatures.The title and author list of the VGP manuscript, "The Vertebrate Genomes Project Phase I: A global reference genome resource"A QR code linking to the pre-print of the VGP manuscript
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Pause AI in BC Schools @aicaution.ca · 06/07/2026
There are a horrifying number of computer science professors that still just "solve problems" with no thoughts. People who publish papers like: "We made an algorithm that can detect human shapes from infrared data, and even works with children behind tent covers."
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Iris van Rooij 💭 @irisvanrooij.bsky.social · 06/07/2026
How can one be a scientist in this world and not be an activist?
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Jon Phillips @jowiph.bsky.social · 03/07/2026
I would kill or die for Larry
A small operation in Oregon that hunts truffles with a trained dog has added an unpaid trainee. A cat named Larry accompanies the handler and the truffle dog into the woods every outing, works a patch of ground a little apart from them, and digs with tremendous confidence in places where there is nothing.
The handler says Larry has never found a truffle and shows no sign of understanding the assignment. He does not use scent the way the dog does and he does not respond when the dog makes a find.
He simply digs his own holes nearby and then inspects them. "He thinks he's on the team," the handler said. "He is emphatically not on the team."
TRUFFLE DOG FINDS THE TRUFFLES -
'TRAINEE' CAT DIGS RANDOM HOLES AND FINDS DIRT
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elizabethginexi.bsky.social @elizabethginexi.bsky.social · 03/07/2026
I made a 2-page Take Action Flyer for anyone to download and use! We need all hands on deck! drive.google.com/file/d/1ppq4...
drive.google.com
OMB Rule Flyer - Take Action.pdf
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Ferris Jabr @ferrisjabr.bsky.social · 01/07/2026
I've been documenting a pair of black-capped chickadees nesting in our garden as they fly back & forth every few minutes, hunting meals. An avg clutch of 6 to 8 chickadees requires 3,000 to 5,000 feedings over the ~16 days from hatching to fledging. Most popular foods: caterpillars, moths, spiders.
A collage of 16 photos of black-capped chickadees. Each photo depicts a closeup of a single chickadee with prey in their mouth, such as a caterpillar, adult moth, other winged insect, or spider. The chickadees are small songbirds with gray-white plumage and patches of black on their heads and throats.
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Harmit Singh Malik @harmitmalik.bsky.social · 01/07/2026
😮 @danielgorelick.bsky.social @biologyopen.bsky.social www.nature.com/articles/d41...
nature.com
Why paying peer reviewers works, according to a journal’s editor-in-chief
A biology journal that paid peer reviewers found that the approach cut the time to a first editorial decision by 85% and maintained high-quality reviews.
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Reposted by Prajna Hebbar
bioRxiv Evolutionary Biology @biorxiv-evobio.bsky.social · 29/06/2026
The evolution of structural variation across 500 million years of vertebrate evolution www.biorxiv.org/content/10.64898/20…
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Colin Carlson @colincarlson.bsky.social · 13/06/2026
too hungry to bedrot too lazy to write
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Michael Okun @michael-okun.bsky.social · 10/06/2026
I’ve officially resigned as Associate Editor for Frontiers in Systems Neuroscience. It used to be a reputable journal, but became a case study in how forced automation destroys academic integrity. 👇
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Nic Rawlence @nicrawlencenz.bsky.social · 07/06/2026
Being a bird nerd is now cool. Well, it always was cool, but the rest of the world is finally cottoning on. Nice write-up in the Sunday Star Times and The Post with quotes from me accessiblenews.xyz/article/www.... @birdsnewzealand.bsky.social
accessiblenews.xyz
Why Gen Z - and me - have gone to the birds
ESSAY: Once a pastime associated with tweed jackets and thermoses, birdwatching is now soaring in popularity among young people.
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Adam Phillippy @aphillippy.bsky.social · 08/06/2026
T2T assemblies for nearly all major Y chromosome haplogroups courtesy of a collab between @humanpangenome.bsky.social and HGSVC! What was once the hardest human chromosome to finish can now be routinely assembled thanks to ONT + Verkko www.biorxiv.org/content/10.6...
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Prajna Hebbar @prajnahebbar.bsky.social · 08/06/2026
Happy to have played a small role in this really cool paper!
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Molly Przeworski @mollyprz.bsky.social · 15/05/2026
Happy to highlight new findings by Vanesa Getseva and Lin Poyraz about the sources of variation in germline mutation rates among humans: www.biorxiv.org/content/10.6... Joint work with Anastasia Stolyarova and @ipsitaagarwal.bsky.social. 1/n
biorxiv.org
A sibling study of variation in parental mutation rates
People are born with variable numbers of de novo germline mutations (DNMs), depending primarily on the ages of their parents. To explore additional causes, we developed an approach to call DNMs from nucleotide differences between siblings in genomic regions inherited identical by descent from both parents. Applying it to whole genome sequences from 28,985 sibling pairs of diverse genetic ancestries present in the UK Biobank and All of Us datasets, as well as 2,330 trios, we identified >800K autosomal DNMs and characterized mutation phenotypes in 27,645 sets of parents. We found subtle shifts in the mutation spectrum but no differences in total DNM rates among genetic ancestry groups, or between smokers and non-smokers. Testing for associations between parental mutation phenotypes and their burden of loss-of-function and deleterious missense variants in a set of 180 DNA repair and maintenance genes, we discovered that disruptions in REV1 and LIG1 increase germline mutation rates, and thus that rare mutator alleles segregate in population cohorts. ### Competing Interest Statement The authors have declared no competing interest. NIH, R35 GM083098
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Human Pangenome Reference Consortium @humanpangenome.bsky.social · 14/05/2026
Recent research explores the evolution and regulation of the human-specific NOTCH2NL gene family using near-complete long-read assemblies from humans and apes. Uncover the science behind it: www.cell.com/cell-genomic...
cell.com
Genetic diversity and regulatory features of human-specific NOTCH2NL duplications
Human-specific NOTCH2NL segmental duplications are implicated in brain cortical expansion. Analysis of 82 long-read assemblies from apes and humans shows independent duplications. Human-specific NOTCH...
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Ghostly Bree @mostlybree.kitrocha.com · 12/05/2026
dear god PLEASE let this also lead to a wider acceptance that treatment needs to include *improving quality of life* and not just "how to make them have baby"
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Dr. Brendan "Doesn't-go-to-Ravenholm" Pinto @drpintothe2nd.bsky.social · 29/04/2026
Happy to announce two-fold news! 1) The SCINKD paper is now published in @molbioevol.bsky.social - doi.org/10.1093/molb... 2) SCINKD [v2.2.4] release has reduced runtimes (about 2x) and the revitalized mode for genomes >5Gb is now live and tested on genomes up to 21Gb! 🐸 github.com/DrPintoThe2n...
doi.org
Sex chromosome identification and genome curation from a single individual with SCINKD
Abstract. In most animal species, the sex-determining pathway is typically initiated by the presence/absence of a primary genetic cue at a critical point d
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Prajna Hebbar @prajnahebbar.bsky.social · 28/03/2026
We built the first complete genome for the common marmoset, fully resolving regions that were previously missing: centromeres, acrocentric short arms, and more. A new reference genome for anyone working with marmosets. This was an awesome collaborative effort & I’m grateful to all my co-authors! 🧬
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bioRxiv Genomics @biorxiv-genomic.bsky.social · 27/03/2026
A Complete Genome for the Common Marmoset www.biorxiv.org/content/10.64898/20…
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Adam Phillippy @aphillippy.bsky.social · 02/02/2026
Time for a thread on our Christmas preprint “Origin and evolution of acrocentric chromosomes in human and great apes”. I had so much fun with this project and paper. It will be hard to summarize in a thread, but I’ll try www.biorxiv.org/content/10.6... [1/21]
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Prajna Hebbar @prajnahebbar.bsky.social · 03/02/2026
This was such a fun project. Adam's thread on it is a great summary!
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bioRxiv Genomics @biorxiv-genomic.bsky.social · 24/12/2025
Origin and evolution of acrocentric chromosomes in human and great apes www.biorxiv.org/content/10.64898/20…
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Leo @leogdlima.bsky.social · 24/12/2025
Congratulations, To you, Steven and Prajna. Super cool findings.
media.tenor.com
a group of gorillas are standing in a cage looking out of a hole .
ALT: a group of gorillas are standing in a cage looking out of a hole .
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Adam Phillippy @aphillippy.bsky.social · 24/12/2025
If you’ve heard me talk in the past ~5 years, you will know I have developed an obsession with acrocentric chromosomes. This is all of that, condensed into one paper. I will do a full thread in the new year, but for those that want something to read over the holidays, have at it. Such a cool story!
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samuel mehr @mehr.nz · 17/11/2025
periodic reminder of the existence of Atkinson Hyperlegible, a free font available from the Braille Institute designed to improve readability for people with low vision I use it in talks because it's pretty and also because, as an audience member, I am perpetually squinting at people's slides
brailleinstitute.org
Atkinson Hyperlegible Font - Braille Institute
Read easier with Atkinson Hyperlegible Font, crafted for low-vision readers. Download for free and enjoy clear letters and numbers on your computer!
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Science Magazine @science.org · 09/10/2025
As the Moon eclipsed the Sun on 8 April 2024, birds took note. Leveraging nature’s own experiment, scientists and the public joined forces to show how different species responded to sudden midafternoon darkness followed by a new “dawn.” Learn more this week in Science: scim.ag/48WbhLL
As the Moon eclipsed the Sun on 8 April 2024, birds like these rock pigeons (Columba livia) took note.
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Xian Chang @xian-chang.bsky.social · 02/10/2025
🦒Long read giraffe is out!🦒 Mapping long reads to pangenome graphs is ~10x faster than with GraphAligner, with veeery slightly better mapping accuracy, short variant calling, and SV genotyping than GraphAligner or Minimap2
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Melissa Wilson @sexchrlab.bsky.social · 07/05/2025
Our work looking at the effects of using autosomal assumptions for calling variation on X and Y. We used simulated data to compare to a ground truth. Tldr: Accurate ploidy is important for reducing false positives; appropriate alignment reduces false negatives. www.biorxiv.org/content/10.1...
biorxiv.org
Best practices for improving alignment and variant calling on human sex chromosomes
Sex chromosome complement is the largest karyotypic variation observed in humans. X and Y chromosomes were once a pair of homologous autosomes. Although chromosome X and Y differentiated from one anot...
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Adam Phillippy @aphillippy.bsky.social · 12/05/2025
The human pangenome continues to grow and improve! Release 2 is here! Click through for the details, but this is a pretty amazing dataset including not just the phased assemblies, but PacBio HiFi, ONT Ultralong, Dovetail/Illumina Hi-C, PacBio Kinnex, and Illumina WGS for all samples
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Human Pangenome Reference Consortium @humanpangenome.bsky.social · 12/05/2025
📢 HPRC Release 2 is here! Now with phased genomes from 200+ individuals, a 5x increase from Release 1. Explore sequencing data, assemblies, annotations & alignments in our interactive data explorer ⬇️: humanpangenome.org/hprc-data-re...
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Prajna Hebbar @prajnahebbar.bsky.social · 10/04/2025
Our primate T2T paper came out in Nature yesterday! It was a huge effort and I'm so grateful that I got the opportunity to work with this amazing group of scientists over the first two years of my PhD! www.nature.com/articles/s41...
nature.com
Complete sequencing of ape genomes - Nature
Complete sequences of chromosomes telomere-to-telomere from chimpanzee, bonobo, gorilla, Bornean orangutan, Sumatran orangutan and siamang provide a comprehensive and valuable resource for future evol...
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