Christophe Dessimoz's Avatar

Christophe Dessimoz

@dessimoz

Executive Director of SIB Swiss Institute of Bioinformatics @sib.swiss and Professor at the University of Lausanne (UNIL), Switzerland. @cdessimoz and @dessimoz@mstdn.science elsewhere. Comparative Genomics, Phylogenetics, Evolution, Computational Biology.

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14.11.2024
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Latest posts by Christophe Dessimoz @dessimoz

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๐Ÿ“ฃ #ECCB2026 proceedings deadline extended to 16 March 13:00 CET
Submit to 1 of our 6๏ธโƒฃ sessions:
๐Ÿ”น Genomics
๐Ÿ”น Transcriptomics & gene regulation
๐Ÿ”น Proteins & structural biology
๐Ÿ”น Systems biology
๐Ÿ”น Environmental bioinformatics
๐Ÿ”น ELIXIR Communities
๐Ÿ‘‰ More info: eccb2026.org/call-proceedings

04.03.2026 13:24 ๐Ÿ‘ 5 ๐Ÿ” 5 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Learning Paths | SIB Swiss Institute of Bioinformatics

Very nice learning paths at @sib.swiss: www.sib.swiss/training/lea...

25.02.2026 11:37 ๐Ÿ‘ 3 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Weโ€™re hiring: Research Group Leader in computational biology.

Are you generating more research ideas than you can explore? Lead cutting-edge AI & biology research at EMBL-EBI.

Apply by 11 April 2026: embl.wd103.myworkdayjobs.com/en-US/EMBL/j...

#ScienceCareers @ewaldlab.org @embl.org

10.02.2026 11:31 ๐Ÿ‘ 39 ๐Ÿ” 50 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 2
The missing link in FAIR data policy: biodata resources in life sciences - Scientific Data In the life sciences, FAIR principles have reshaped research policy, but their implementation still relies largely on individual researchers โ€“ many of whom lack the expertise or support needed to make...

How to maximise the value of public investment, strengthen #OpenScience and international collaboration, and unlock the full potential of #FAIR www.nature.com/articles/s41... with colleagues from @sib.swiss & @elixir-europe.org

10.02.2026 16:13 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
The missing link in FAIR data policy: biodata resources in life sciences - Scientific Data In the life sciences, FAIR principles have reshaped research policy, but their implementation still relies largely on individual researchers โ€“ many of whom lack the expertise or support needed to make...

From @dessimoz.bsky.social and colleagues in @nature.com 's #Scientific #Data | The missing link in FAIR data policy: biodata resources in life sciences | #FAIR #Genomics #OpenScience #OpenSource #Proteomics ๐Ÿงฌ ๐Ÿ–ฅ๏ธ ๐Ÿงช ๐Ÿ”“
โฌ‡๏ธ
www.nature.com/articles/s41...

07.02.2026 15:53 ๐Ÿ‘ 8 ๐Ÿ” 4 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Apply now! The 2026 call for the EMBO Young Investigator Programme is now open with a deadline of 1 April 12:00 midday CEST. ๐Ÿงช

More info here:
https://www.embo.org/funding/fellowships-grants-and-career-support/young-investigator-programme/
#LifeSciences #research #funding

02.02.2026 09:15 ๐Ÿ‘ 23 ๐Ÿ” 23 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 2
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Robert Waterhouse โ€” Earth BioGenome Project Rob Waterhouse has always been fascinated by lifeโ€™s many interconnections, from his childhood on an isolated ranch in Swaziland to his current role leading a community of more than 1,100 researchers a...

Spotlight @ebpgenome.bsky.social www.earthbiogenome.org/newsletter-b... --- thanks to the fantastic #biodiversity #genomics @ergabiodiv.bsky.social #community!

03.02.2026 21:42 ๐Ÿ‘ 18 ๐Ÿ” 5 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0

(1/3) I am very happy to share that Iโ€™ll be moving to Aarhus University as an Assistant Professor in March. During these years, Iโ€™ve met so many great people who supported me on this path, and even if I canโ€™t name everyone here, Iโ€™m truly grateful to all of you!

02.02.2026 18:26 ๐Ÿ‘ 7 ๐Ÿ” 2 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0
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๐Ÿงฌ Just out in Bioinformatics Advances: "OMAnnotator: A novel approach to building an annotated consensus genome sequence".ย 

Full article available: https://doi.org/10.1093/bioadv/vbag015ย 

Authors include: @dessimoz.bsky.social, @whynevers.bsky.social

29.01.2026 10:02 ๐Ÿ‘ 3 ๐Ÿ” 5 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
For each orthologous gene family, we constructed three MSAs: original, computed by applying sequence aligners directly to the input sequences; enriched, computed by aligning the combined set of orthologs and homologs identified by database search; and impoverished, obtained by removing the added homologs from the enriched MSA. We then used TCS to quantify congruence of the resulting trees against the known taxonomy. The normalized difference in congruence between the original and enriched trees captures the joint impact of sequence addition on alignment and tree inference. The normalized difference between the original and impoverished trees reflects the effect on alignment quality alone. The effect on tree inference can then be estimated by subtraction. We observed a positive impact of homolog enrichment on phylogenetic tree inference step, regardless of the sequence aligner used to build the alignments. Notably, the impact of sequence addition on alignments was marginal.

For each orthologous gene family, we constructed three MSAs: original, computed by applying sequence aligners directly to the input sequences; enriched, computed by aligning the combined set of orthologs and homologs identified by database search; and impoverished, obtained by removing the added homologs from the enriched MSA. We then used TCS to quantify congruence of the resulting trees against the known taxonomy. The normalized difference in congruence between the original and enriched trees captures the joint impact of sequence addition on alignment and tree inference. The normalized difference between the original and impoverished trees reflects the effect on alignment quality alone. The effect on tree inference can then be estimated by subtraction. We observed a positive impact of homolog enrichment on phylogenetic tree inference step, regardless of the sequence aligner used to build the alignments. Notably, the impact of sequence addition on alignments was marginal.

We devised a benchmark method to quantify the impact of homolog enrichment on phylogenetic inference, decomposing the effects on MSA quality, tree inference quality, and rooting. We show homolog enrichment improves tree inference, while effects on alignments remain marginal. ๐Ÿงต2/n

28.01.2026 06:10 ๐Ÿ‘ 7 ๐Ÿ” 2 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
AmpliPhy improves gene trees by adding homologs without affecting alignments In phylogenomics, gene tree reconstruction depends on multiple sequence alignment (MSA) and tree inference, and ongoing work continues to improve inference quality. Denser taxon sampling has been associated with improved gene tree inference, suggesting that adding homologs could be a practical route to higher accuracy as sequence databases continue to expand. However, adding sequences can influence multiple steps of typical inference pipelines, and little is known on its specific effect on the multiple sequence alignment, tree reconstruction, and rooting steps. We performed a large-scale empirical benchmark to quantify how homolog enrichment affects alignment and phylogenetic inference. Using an enrichment-impoverishment design and a measure of tree accuracy based on taxonomic congruence, we found that enrichment consistently improves tree inference quality, while effects on alignment quality are marginal. We show that this improvement is associated with accurate root placement on enriched trees when sensitive homolog search is accompanied. Notably, much of the benefit can be retained with relatively compact alignments produced by sequence addition. Building on these observations, we provide a tool, AmpliPhy, which efficiently improves phylogenetic reconstruction of protein families through homolog enrichment. The AmpliPhy open-source pipeline software is available at https://github.com/DessimozLab/ampliphy. ### Competing Interest Statement The authors have declared no competing interest. Swiss National Science Foundation, https://ror.org/00yjd3n13, 216623, 10005715

Can ever-increasing sequence databases improve phylogenetic reconstruction of a gene family? Our new preprint introduces AmpliPhy, a pipeline that automates homolog enrichment to improve gene tree inference, built on a robust phylogenomic benchmark scheme. ๐Ÿงต1/n
๐Ÿ“ƒ doi.org/10.64898/2026.01.26.701724

28.01.2026 06:10 ๐Ÿ‘ 25 ๐Ÿ” 14 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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A 5500-year-old Treponema pallidum genome from Sabana de Bogotรก, Colombia Treponematosis, a bacterial infection caused by Treponema pallidum subspecies and T. carateum (yaws, bejel, syphilis, pinta), has afflicted humans for millennia. Despite paleopathological evidence and...

Treponemal diseases might have been with us much longer than previously thought! In our recent study, we used ancient DNA to reconstruct a 5,500-year-old ๐˜›๐˜ณ๐˜ฆ๐˜ฑ๐˜ฐ๐˜ฏ๐˜ฆ๐˜ฎ๐˜ข ๐˜ฑ๐˜ข๐˜ญ๐˜ญ๐˜ช๐˜ฅ๐˜ถ๐˜ฎ genome, revealing a previously unknown divergent subspecies.
You can check it out here:
www.science.org/doi/10.1126/...

22.01.2026 19:21 ๐Ÿ‘ 31 ๐Ÿ” 14 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

๐Ÿงฌ Une dรฉcouverte d'une รฉquipe internationale, dont des scientifiques de l'Unil et du CHUV, apporte de nouveaux รฉlรฉments attestant d'une grande #diversitรฉ de #pathogรจnes dans les Amรฉriques bien avant l'arrivรฉe des Europรฉens.
๐Ÿ‘‰ www.unil.ch/news/fr/1768...

@unil.bsky.social @sib.swiss #ADNancien #chuv

22.01.2026 22:22 ๐Ÿ‘ 2 ๐Ÿ” 2 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Millenia-old pathogen DNA shed light onto its evolution
Millenia-old pathogen DNA shed light onto its evolution YouTube video by Dรฉpartement de Biologie Computationnelle - UNIL

๐Ÿ‘ Congratulations on this new publication and the great video about the discovery www.youtube.com/watch?v=qewc...

22.01.2026 22:26 ๐Ÿ‘ 2 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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In remembrance of Peer Borkย  | EMBL EMBL and its community are deeply saddened by the death of Peer Bork, the organisationโ€™s Interim Director General.

Shocking and very sad news. Peer Bork passed away much too soon. Our thoughts are with his family, friends, and the entire EMBL community. www.embl.org/news/embl-an...

16.01.2026 20:00 ๐Ÿ‘ 7 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Three further SIB knowledgebases gain prestigious European recognition A total of eight expertly curated knowledgebases developed by SIB scientists are now designated as ELIXIR Core Data Resources (CDRs) โ€“ with the three new additions representing half of those sel...

๐ŸŽ‰ Congratulations to Bgee and the two complementary SwissOrthology knowledgebases, OMA and OrthoDB, for being selected as ELIXIR Core Data Resources! See more๐Ÿ‘‡

@bgee.org @marcrr.bsky.social @dessimoz.bsky.social @elixir-europe.org

12.01.2026 10:26 ๐Ÿ‘ 7 ๐Ÿ” 7 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

This needs boosting.
How we share data now, determines how prepared we are for tomorrow. That includes having access to *all* who need it (inccitizen scientists like @ryanhisner.bsky.social) & being able to use it in dashboards & apps.
Having one place control it all - is dangerous.

#OpenScience

08.01.2026 15:05 ๐Ÿ‘ 33 ๐Ÿ” 20 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0
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Fresh conflicts erupt around giant database for flu and COVID-19 sequences Critics say โ€œautocraticโ€ behavior by GISAID could hamper response to a future pandemic

โ€œ[P]utting data into GISAID is like dropping it in a mail slot in an unmarked building,โ€ says @colincarlson.bsky.social. โ€œItโ€™s wonderful that thereโ€™s so much cool stuff in that building. It would be great if we knew who owned it, or who paid for it, or what they plan to do with it.โ€
#IDsky ๐Ÿงช

07.01.2026 09:51 ๐Ÿ‘ 49 ๐Ÿ” 19 ๐Ÿ’ฌ 4 ๐Ÿ“Œ 4
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We are pleased to welcome 3 new Group Leaders to SIB as of 1 January 2026.
Nadine Fournier leads the Biomedical Data Science Facility at UNIGE
Tim Roloff-Handschin and Helena Seth-Smith (UZH) join SIBโ€™s microbial genomics community.
These appointments strengthen SIBโ€™s network and expertise.

05.01.2026 15:07 ๐Ÿ‘ 9 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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#TAIR is a key reference tool #plantscience. That's why nearly 100 volunteers chose to contribute to the soon-to-be-released reannotation of the #Arabidopsis genome. ๐Ÿงช

Meet one of those volunteers: Emmanuel Boutet: bit.ly/4p6FagQ

#plantbiology #genomics #TAIR12 #plantbiology #scisky

29.12.2025 18:06 ๐Ÿ‘ 11 ๐Ÿ” 5 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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๐Ÿ‘‰ Point your friends, family and connections to our new video ๐Ÿ“น on the point of bioinformatics!

The 90-second video is available in:

๐Ÿ‡ฌ๐Ÿ‡ง youtu.be/yjbv1WZcM2M
๐Ÿ‡ซ๐Ÿ‡ท youtu.be/BG-h_nxwSE4
๐Ÿ‡ฉ๐Ÿ‡ช youtu.be/e4S4m1IhfiU
๐Ÿ‡ฎ๐Ÿ‡น youtu.be/V4QcZHjnsGo

10.12.2025 08:55 ๐Ÿ‘ 11 ๐Ÿ” 6 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Full Stack Web Developer for Life Science Research

We are hiring for a web developer position, ideally with some experience in bioinformatics. This position is aimed at helping us turn our research in human genetics into useful tools. A background in either bioinformatics or web development is required.

jobs.ethz.ch/job/view/JOP...

09.12.2025 17:09 ๐Ÿ‘ 7 ๐Ÿ” 11 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Creation of new junior research groups at the Institut Pasteur - Call for applications 2026 - Research The Institut Pasteur is launching an international call to recruit new junior research group leaders leveraging cutting-edge transdisciplinary approaches to exploring infectious diseases, host-microbe...

๐Ÿ”ฌ Call to create junior research groups at the Institut Pasteur

Focus: Infectious diseases, host-microbe interactions, vaccines
Special interest: AI methodologies

๐Ÿ“… Deadline: Feb 9, 2026
๐Ÿ‘ฅ 2-12 years post-PhD

Apply now ๐Ÿ“ research.pasteur.fr/en/call/crea...

#JobOpportunity #Research

08.12.2025 08:53 ๐Ÿ‘ 99 ๐Ÿ” 136 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 9
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Amos Bairoch, Swiss pioneer of bioinformatics, passes away We are deeply saddened to announce the passing of our co-founder and Group Leader Amos Bairoch. Emeritus professor at the University of Geneva, he shaped the development of bioinformatics over more th...

We are deeply saddened to share the passing of Amos Bairoch, pioneer of bioinformatics and co-founder of SIB. His lifelong commitment for high-quality, open data transformed global research. We honour his legacy by continuing to build the future of bioinformatics.

02.12.2025 08:24 ๐Ÿ‘ 35 ๐Ÿ” 16 ๐Ÿ’ฌ 4 ๐Ÿ“Œ 8

I will be giving several talks this coming week at universities in Switzerland: Lausanne, Neuchรขtel, Basel, and Bern. Hope to see some of you there!

29.11.2025 13:37 ๐Ÿ‘ 64 ๐Ÿ” 10 ๐Ÿ’ฌ 5 ๐Ÿ“Œ 1
Call for Applications: Pathogen Data CUREsโ€”Curriculum Development Workshop

Interested in learning materials to prepare undergraduate students for working with pathogens and pathogen data? Iโ€™m hosting a small curriculum development sprint/workshop. Industry/clinical and educators needed.

Please share. Apply by November 28, 2025
dnalc.cshl.edu/pdn-2026-wor...

11.11.2025 20:29 ๐Ÿ‘ 10 ๐Ÿ” 13 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 1
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๐Ÿš€ Partner with ECCB 2026 in Geneva (31 Augโ€“4 Sept), gathering 1,000+ experts in compbio, bioinformatics, AI, biodiversity & data-driven health, to:
๐Ÿ”นShowcase your innovations
๐Ÿ”นIncrease your visibility in Europe
๐Ÿ”นRecruit top talents
๐Ÿ‘‰ Explore our packages: eccb2026.org/become-partner

25.11.2025 11:14 ๐Ÿ‘ 6 ๐Ÿ” 3 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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PhyloWeaver โ€“ Interactive phylogenetic tree editor Edit and visualize phylogenetic trees directly in your browser. PhyloWeaver lets you interactively rearrange tree topologies and export high-quality figures for publications and presentations.

Iโ€™ve released a tool to sketch and edit phylogenetic trees!
yawak.jp/PhyloWeaver/

Load a Newick file and intuitively add/remove/resize branches.
Useful for quick conceptual trees, extracting subtrees, or turning ideas into Newick.

18.11.2025 01:59 ๐Ÿ‘ 145 ๐Ÿ” 74 ๐Ÿ’ฌ 4 ๐Ÿ“Œ 1
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Interested in the newest developments in orthology? Check out the last Quest for Orthologs (QfO9) meeting report:
link.springer.com/article/10.1...
#orthology #function #domains #AI #paralogy
Thanks to @sinamajidian.bsky.social and all co-authors for their valuable contribution.

18.11.2025 11:52 ๐Ÿ‘ 16 ๐Ÿ” 5 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Building a continuous benchmarking ecosystem in bioinformatics Benchmarking, which involves collecting reference datasets and demonstrating method performance, is a requirement for the development of new computational tools, but also becomes a domain of its own t...

From @csoneson.bsky.social , @markrobinsonca.bsky.social & colleagues in @plos.org #Computational #Biology | Building a continuous #benchmarking ecosystem in #bioinformatics | #Education ๐Ÿงฌ ๐Ÿ–ฅ๏ธ ๐Ÿงช ๐Ÿ”“ ย 
โฌ‡๏ธ
journals.plos.org/ploscompbiol...

15.11.2025 17:11 ๐Ÿ‘ 15 ๐Ÿ” 11 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1