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Posts by Iain Johnston

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Mito evolution special issue of Phil Trans now out! royalsocietypublishing.org/rstb/issue/3...
Excited to be part of this, with some new perspectives on mtDNA segregation from us royalsocietypublishing.org/rstb/article... and brilliant content from colleagues worldwide! Pics from current location 🇳🇴

2 weeks ago 5 1 0 0
A black-and-white historical photograph of Dr. Maud Leonora Menten (1879–1960), the Canadian physician and biochemist who co-developed the Michaelis–Menten equation for enzyme kinetics. Taken in her laboratory (likely at the University of Pittsburgh in the 1910s–1920s), she stands with a serious, focused expression—lips closed, eyes direct and thoughtful—against a backdrop of wooden shelves filled with glass bottles, jars, scientific equipment, and a wire-mesh enclosure. She wears a dark dress with a lace collar, a string of beads, and her hair styled in a neat bun. Superimposed on the image is the Michaelis–Menten equation in white text:v=Vmax⁡[S]Km+[S]v = \frac{V_{\max} [S]}{K_m + [S]}v = \frac{V_{\max} [S]}{K_m + [S]}
This iconic portrait captures Menten during her groundbreaking research in biochemistry and histochemistry, where she helped establish the foundational mathematical model of enzyme-substrate reactions still used today, while overcoming significant gender barriers as one of the first women in Canada to earn both an M.D. and a Ph.D.

A black-and-white historical photograph of Dr. Maud Leonora Menten (1879–1960), the Canadian physician and biochemist who co-developed the Michaelis–Menten equation for enzyme kinetics. Taken in her laboratory (likely at the University of Pittsburgh in the 1910s–1920s), she stands with a serious, focused expression—lips closed, eyes direct and thoughtful—against a backdrop of wooden shelves filled with glass bottles, jars, scientific equipment, and a wire-mesh enclosure. She wears a dark dress with a lace collar, a string of beads, and her hair styled in a neat bun. Superimposed on the image is the Michaelis–Menten equation in white text:v=Vmax⁡[S]Km+[S]v = \frac{V_{\max} [S]}{K_m + [S]}v = \frac{V_{\max} [S]}{K_m + [S]} This iconic portrait captures Menten during her groundbreaking research in biochemistry and histochemistry, where she helped establish the foundational mathematical model of enzyme-substrate reactions still used today, while overcoming significant gender barriers as one of the first women in Canada to earn both an M.D. and a Ph.D.

Chemist/physician Dr. Maud Menten co-authored the seminal paper 𝘋𝘪𝘦 𝘒𝘪𝘯𝘦𝘵𝘪𝘬 𝘥𝘦𝘳 𝘐𝘯𝘷𝘦𝘳𝘵𝘪𝘯𝘸𝘪𝘳𝘬𝘶𝘯𝘨, 1931. This intro'd the Michaelis–Menten equation (image). It remains a cornerstone of #biochemistry, used in drug design, metabolic studies & enzyme engineering. She was born #OTD in 1879.

#WomenInSTEM

1 month ago 191 73 1 4
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High-frequency biparental inheritance of plant mitochondria upon chilling stress and loss of a genome-degrading nuclease - Nature Plants Maternal inheritance of mitochondria breaks down in the cold when a mitochondrial DNA degrading nuclease is defective, resulting in biparental inheritance that can rescue mitochondrial mutations and g...

Mitochondria can indeed be inherited from the father! 🍀
In this new study, we uncovered the molecular mechanisms underlying mitochondrial inheritance in Nicotiana tabacum. @natplants.nature.com

doi.org/10.1038/s414...

1 month ago 28 12 1 0
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Vinterferie ❤️🇳🇴🦢

1 month ago 2 0 0 0
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A small polymerase ribozyme that can synthesize itself and its complementary strand The emergence of a chemical system capable of self-replication and evolution is a critical event in the origin of life. RNA polymerase ribozymes can replicate RNA, but their large size and structural ...

Perhaps... how life started?!
www.science.org/doi/10.1126/...

2 months ago 11 4 0 1
The visualization of two bacterial genomes, of 50 and 52kb, representing independent instances of extreme genomic reduction in ancient heritable endosymbionts of planthoppers.

The visualization of two bacterial genomes, of 50 and 52kb, representing independent instances of extreme genomic reduction in ancient heritable endosymbionts of planthoppers.

Our new paper in @natcomms.nature.com is now online-early!

We describe independent evolution of bacterial genomes of only ~50–52 kb — the smallest known outside cellular organelles — revealing striking convergence toward minimal gene sets.

🔗 doi.org/10.1038/s414...

2 months ago 83 31 5 7

1. The thing about science that these jokers don't understand is that science cannot be vibe-coded.

Whatever its flaws, the point with vibe coding is that you're trying to quickly make something that sorta works, where you can immediately sorta see if it sorta works and then sorta use it.

2 months ago 968 284 26 24
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Check out our latest Special Section guest edited by @mitopozzi.bsky.social and Sophie Breton:

Beyond ATP: New insight into mitochondrial function and evolution

🎨 Cover image - artwork by Iain G Johnston

academic.oup.com/jeb/pages/be...

2 months ago 9 4 5 0
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Local mitochondrial physiology defined by mtDNA quality guides purifying selection Author summary Mitochondria are essential organelles in our cells that convert nutrients into usable cellular energy. They contain their own DNA, and mutations in this DNA can compromise mitochondrial...

How do cells assess mtDNA quality?

Local ATP and membrane-potential gradients reflect mtDNA integrity and drive intracellular purifying selection.

We introduce FAST, a scalable mtDNA QC assay in S. cerevisiae.

Great collaboration with the Schmoller Lab.

journals.plos.org/plosgenetics...
🧬⚡

3 months ago 31 10 1 2
Book front cover with illustrations of fern leaves and the title: Ferns, lessons in survival from Earth’s most adaptable plants
Written by: Fat-Wei Li and Jacob S. Suissa
Illustrated by Laura Silburn

Book front cover with illustrations of fern leaves and the title: Ferns, lessons in survival from Earth’s most adaptable plants Written by: Fat-Wei Li and Jacob S. Suissa Illustrated by Laura Silburn

Looking for a new 📕 to read about plants??
I highly recommend the brilliant book ‘Ferns, Lessons in survival from Earth’s most adaptable plants’
Written by @fernway.bsky.social and Jacob Suissa with amazing illustrations by Laura Silburn
🌿 #FernFriday 🌿

3 months ago 77 20 4 1

1. Apply for one of the positions below (lab or theory) by Jan 18th
2. Learn interdisc skills and discover cool new things about how mitochondria move and socialise
3. Explore some of Norway's beautiful nature (both the below, Rundemanen and Gullfjellet, <10km from work)

3 months ago 5 8 0 0
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2026 ❤️ 🇳🇴

3 months ago 2 0 1 0

‼️Two new PhD positions open! One experimental, one modelling, exploring these beautiful collective dynamics in mitochondria across species. 🇳🇴, good pay, full staff benefits. [Shares much appreciated]
Lab: www.jobbnorge.no/en/available...
Modelling: www.jobbnorge.no/en/available...

4 months ago 4 5 0 2

Thrilled to see our review article "The evolutionary origins of synaptic proteins" highlighted on the cover of Nature Reviews Neuroscience 🤩.

www.nature.com/articles/s41...

@msarscentre.bsky.social 🧠✨🧬🌊🪼🧽

4 months ago 120 37 1 2
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Mitochondria, hypercubes, and a blackboard -- what a lot of favourite things for J Evol Biol this month! Thanks to all involved for a smooth and pleasant review editorial process; academic.oup.com/jeb/article/...

4 months ago 5 0 0 0
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Ski season!

5 months ago 4 0 0 0
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Paradise up on the mountain trails

5 months ago 2 0 0 0
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We have wondered what a complex archaeal cell might look like ever since 2014. It’s been a long road (and the journey is far from over), but it’s a good time to pause for breath and look. These Asgard archaeal cells are a surprise! And that is the joy of being a cell biologist.

5 months ago 162 48 8 4
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Convergent pathways of reductive mitochondrial evolution characterized with hypercubic inference Abstract. For a striking example of mitochondrial behaviour beyond adenosine triphosphate (ATP) generation, consider mitochondrion-related organelles (MROs

In some species, #mitochondria have lost functions: from specific complexes to the ability to produce #ATP (and more!). We examine the evolutionary pathways of this reduction, from yeast and mistletoe to parasite "MROs":

doi.org/10.1093/jeb/...

@mitomaths.bsky.social et al. 2025

5 months ago 3 1 0 0
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Global diversity, predictors, and predictions of AMR evolutionary pathways in Klebsiella pneumoniae Antimicrobial resistance (AMR) is a substantial and growing global health burden. Understanding, and predicting, its evolution in specific pathogens will help responses across scales from individual p...

Would love to hear any feedback; we continue to believe that EvAM applied to AMR (learning evolutionary history) can be a powerful complement to genomic surveys (focussing on the present). Thanks for reading!
www.biorxiv.org/content/10.1...
5/5

6 months ago 2 0 0 0
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Understanding evolutionary dynamics lets us form future predictions. We tested these predictions with newly sequenced data from decades of clinical study in Tanzania. Fitted model retrospectively predicted those previously unobserved accumulation dynamics! 4/

6 months ago 1 0 1 0
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Interesting, but very high-dimensional, so we project down to find the principal axes of diversity in evolutionary behaviour -- and what predicts them. They're linked both to public health region and drug use regimens 3/

6 months ago 0 0 1 0
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Following the ideas in journals.asm.org/doi/full/10.... about applying evol accumulation modelling (EvAM) to AMR, we use genomics data to infer the orderings of character accumulation behind observed Klebsiella AMR profiles across countries (e.g. Romania here), with global average in D 2/

6 months ago 0 0 1 0
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Great to see this out there! We infer the evolutionary pathways behind patterns of AMR in Klebsiella across 102 states, finding globally consistent principles, state-specific deviations (and covariates), and validating evol predictions with new genomes. biorxiv.org/content/10.1... 1/

6 months ago 11 4 1 0
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Recruitment of Talented Researchers to Norway The Research Council supports the recruitment of talented international researchers to the Research Council's centre calls and for projects funded ...

There'll be 2 PhD positions (math / microscopy) on MitoPhyto. But the Norwegian research council is also offering opportunities for non-European postdocs to come to Norway for 3 years associated with FRIPRO projects. Please DM me if interested!
www.forskningsradet.no/en/call-for-...

10 months ago 2 2 0 0
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Celebrating grant award with a mountain run! MitoPhyto, a FRIPRO project, will combine modelling and microscopy to explore mitochondrial and mtDNA maintenance across non-bilaterian multicellular eukaryotes. Opportunities to come to Norway: please see next post

10 months ago 1 1 1 0
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Gratulerer med dagen alle sammen!
(non-Norway-based folks, happy Norwegian Constitution Day!)

11 months ago 0 0 0 0
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Cytoplasmic Inheritance: The Transmission of Plastid and Mitochondrial Genomes Across Cells and Generations Abstract. In photosynthetic organisms, genetic material is stored in the nucleus and the two cytoplasmic organelles: plastids and mitochondria. While both

Glad to share this review, which takes a narrative approach to explore mechanisms governing cytoplasmic inheritance. It highlights exciting advances in the field, while also pointing to the many open questions that remain. Have a read here: doi.org/10.1093/plph...

11 months ago 10 6 1 0
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Had a brilliant time at the 54th Jírovec’s Protozoological Days in Frymburk. Amazing organisms, amazing science, lots of exciting organelle work. Beautiful setting too! Thanks to all www.chromera.org/konference/5...

11 months ago 1 0 0 0
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May trails on the way to the final Applied Statistics lecture of the semester!

11 months ago 2 0 0 0