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Christian Landry

@christianlandry

Padre, curieux, scientist; sourdough engineer; evolutionary cell and systems biology; some attempts at synthetic biology and biomedical research;

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13.10.2023
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Latest posts by Christian Landry @christianlandry

At least if they are written by natural intelligence, you are helping another human fellow.

11.03.2026 14:45 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

One of the few good news this week

11.03.2026 11:36 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Thanks for sharing Clement, looks super interesting :)

06.03.2026 15:13 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

A break "on" or a break "of"? One 'f' away from serious procrastination.

05.03.2026 17:46 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Looks cool, Pedro!

04.03.2026 17:22 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Good luck to all CIHR applicants!

03.03.2026 23:32 πŸ‘ 5 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Paralog interference contributes to the preservation of genetic redundancy Duplicated self-interacting proteins can interact and interfere with each other’s function. Cisneros, Mattenberger, et al. show that selection against interfering loss-of-function alleles extends the ...

New paper alert: Paralog interference contributes to the preservation of genetic redundancy www.cell.com/current-biol...

28.02.2026 02:00 πŸ‘ 45 πŸ” 28 πŸ’¬ 0 πŸ“Œ 0

Never heard of that. Is that a new hairdo?

27.02.2026 13:09 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Hooking on McDavid and other super fast players is always more tolerated, as if refs wanted to keep the game fair.

22.02.2026 13:43 πŸ‘ 2 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

It was him vs them, even if he did not score. At moments he looked like the most motivated guy on the ice.

21.02.2026 00:46 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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The February issue of #GENETICS highlights a model developed by @christianlandry.bsky.social and colleagues that demonstrates how physical interactions between alleles determine total protein activity and contribute to phenotypic dominance and fitness. buff.ly/qqcNPoO

19.02.2026 21:01 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

On veut Desbiens avec les boys demain #goCanadago

19.02.2026 20:05 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
A bridge over an ice-covered river

A bridge over an ice-covered river

Come visit QuΓ©bec City in winter, if only to see the longest cantilever bridge floating over an iced Fleuve Saint-Laurent

15.02.2026 16:29 πŸ‘ 18 πŸ” 2 πŸ’¬ 3 πŸ“Œ 0

Go Brazil go!

14.02.2026 14:13 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Low protein expression enhances phenotypic evolvability by intensifying selection on folding stability - Nature Ecology & Evolution Directed evolution shows that low expression of the green fluorescent protein facilitates the evolution of cyan fluorescence in E. coli, which can be explained by synergy between the protein’s scarcit...

I have particularly enjoyed recent papers that show how expression levels affect protein evolution in various ways. One of them www.nature.com/articles/s41...

12.02.2026 20:58 πŸ‘ 12 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
Strategy to generate a DMS plasmid library for Your Favorite Gene (YFG) using short, degenerate libraries. 1. Segmentation of YFG into sub-fragments, each fragment corresponding to a DNA region to be synthesized. The same approach can be applied to promoter and terminator regions, if desired. 2. Example of a pool of degenerate oligonucleotides (oPool) derived from one YFG fragment associated with DNA barcodes. Each oPool contains: (i) ~40 bp of homology upstream of the YFG fragment of interest, (ii) the YFG fragment sequence with a single NNK codon, (iii) BsaI cloning sites, (iv) a DNA barcode composed of codon-position specific regions and six degenerate nucleotides (N), and (v) a conserved i7 primer binding site (PBS_i7) present in all oPools and used for rapid and efficient sequencing library preparation. Current oligonucleotide synthesis technologies allow for a total of nine degenerate positions per fragment: three are used for the degenerate codon (NNK), and six for the barcode. A complete list of all oPool sequences and their detailed composition is provided in S1 Table. 3. Protocol for constructing YFG DMS plasmid library from oPools using two cloning steps that maintain the physical barcode-mutation association. The libraries of oPools are cloned into the plasmid template by Gibson cloning. Following this step, for each fragment, a necessary short-read sequencing using PBS_i5 (included in the 5β€² sequencing primer) and PBS_i7 is performed to associate each barcode with its corresponding mutation and to assess both barcode diversity per mutation and mutation coverage for the whole fragment. The ultimate step consists in Golden Gate cloning of the missing 3β€² gene fragment between the degenerate fragment and the barcode. An additional short-read sequencing step of the barcodes can be performed to make sure that coverage and diversity have been maintained. Figure created in BioRender.

Strategy to generate a DMS plasmid library for Your Favorite Gene (YFG) using short, degenerate libraries. 1. Segmentation of YFG into sub-fragments, each fragment corresponding to a DNA region to be synthesized. The same approach can be applied to promoter and terminator regions, if desired. 2. Example of a pool of degenerate oligonucleotides (oPool) derived from one YFG fragment associated with DNA barcodes. Each oPool contains: (i) ~40 bp of homology upstream of the YFG fragment of interest, (ii) the YFG fragment sequence with a single NNK codon, (iii) BsaI cloning sites, (iv) a DNA barcode composed of codon-position specific regions and six degenerate nucleotides (N), and (v) a conserved i7 primer binding site (PBS_i7) present in all oPools and used for rapid and efficient sequencing library preparation. Current oligonucleotide synthesis technologies allow for a total of nine degenerate positions per fragment: three are used for the degenerate codon (NNK), and six for the barcode. A complete list of all oPool sequences and their detailed composition is provided in S1 Table. 3. Protocol for constructing YFG DMS plasmid library from oPools using two cloning steps that maintain the physical barcode-mutation association. The libraries of oPools are cloned into the plasmid template by Gibson cloning. Following this step, for each fragment, a necessary short-read sequencing using PBS_i5 (included in the 5β€² sequencing primer) and PBS_i7 is performed to associate each barcode with its corresponding mutation and to assess both barcode diversity per mutation and mutation coverage for the whole fragment. The ultimate step consists in Golden Gate cloning of the missing 3β€² gene fragment between the degenerate fragment and the barcode. An additional short-read sequencing step of the barcodes can be performed to make sure that coverage and diversity have been maintained. Figure created in BioRender.

#DeepMutationalScanning (DMS) experiments are limited by gene size due to library complexity & costs. @christianlandry.bsky.social &co develop an efficient & cost-effective barcoded cloning strategy for plasmid-based DMS libraries that enables study of large genes @plosbiology.org πŸ§ͺ plos.io/4abhyUf

11.02.2026 19:19 πŸ‘ 14 πŸ” 11 πŸ’¬ 0 πŸ“Œ 0
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Six fishermen who cast a line in the frozen Saguenay River in the Canadian province of Quebec worked for more than two hours to reel in an Atlantic halibut that broke local records. www.nytimes.com/2026/02/07/w...

08.02.2026 02:35 πŸ‘ 766 πŸ” 135 πŸ’¬ 180 πŸ“Œ 34
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In #GENETICS, a new model developed by @christianlandry.bsky.social and colleagues examines how molecular dominance determines total protein activity and contributes to phenotypic dominance. buff.ly/CfaTDp7

05.02.2026 21:00 πŸ‘ 10 πŸ” 8 πŸ’¬ 1 πŸ“Œ 0

Ils pourront toujours revenir avec le programme Impact+ :). D’un cotΓ© on leur dit de partir, de l’autre on investit pour amener du talent.

30.01.2026 14:49 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Uppsala in late autumn

Uppsala in late autumn

Join us at the Evolutionary Biology Centre at Uppsala University. We’re searching for an Assistant Professor in Biology. www.uu.se/en/about-uu/...

28.01.2026 20:28 πŸ‘ 158 πŸ” 186 πŸ’¬ 1 πŸ“Œ 5

Best gene synthesis company that does not involve sending $CAD from taxpayers' money south of the border? #synbio

28.01.2026 21:19 πŸ‘ 5 πŸ” 4 πŸ’¬ 2 πŸ“Œ 0
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La différence entre le genre de trucs qu'il dit et ce qu'on rapporte dans les médias est frappante. On 'normalise' son comportement en donnant de la structure et du contenu à ce qu'il dit. C'est un phénomène intéressant toute cette banalisation dont il bénéficie. D'autres exemples sont connus?

21.01.2026 18:00 πŸ‘ 4 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

Another way in which Denmark is helping the US!

19.01.2026 20:27 πŸ‘ 6 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

Territorial integrity and sovereignty are fundamental principles of international law. They are essential for Europe and for the international community as a whole.

17.01.2026 19:32 πŸ‘ 4220 πŸ” 989 πŸ’¬ 194 πŸ“Œ 103

Are we allowed to celebrate anything with all that is happening down the border, to our friends and colleagues, and the fear spreading across the continent?

16.01.2026 12:34 πŸ‘ 3 πŸ” 1 πŸ’¬ 2 πŸ“Œ 0
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Victoire!

11.01.2026 21:38 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Let’s go! La Victoire nous visite!

11.01.2026 20:00 πŸ‘ 3 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Muller’s ratchet but for an entire society, in real time.

09.01.2026 21:40 πŸ‘ 16 πŸ” 3 πŸ’¬ 1 πŸ“Œ 0
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Look like the ones I had recently in Okayama!

04.01.2026 10:30 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Going to the gym is risky!

02.01.2026 22:45 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0