Alejandro Brenes
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ajbrenes.com
Alejandro Brenes
@ajbrenes.com
PostDoc @walmsley-lab.bsky.social @edinuni-irr.bsky.social @edinburgh-uni.bsky.social

| neutrophils single cell proteomics | road cyclist and aero bike enthusiast 🇨🇷🏴󠁧󠁢󠁳󠁣󠁴󠁿

Creator of the Immunological Proteome Resource @immpres.bsky.social
Pinned
Happy to share our latest preprint doing low cell number (mini-bulk) and single cell #proteomics on tumour associated neutrophils from human glioblastoma where we find multiple functional states that would be invisible to scRNAseq, some showing pro-tumoural states with potential therapeutic value
Single cell proteomic analysis defines discrete neutrophil functional states in human glioblastoma
Neutrophils are vital innate immune cells shown to infiltrate glioblastomas, however we currently lack the molecular understanding of their functional states within the tumour niche. Neutrophils are k...
www.biorxiv.org
Reposted by Alejandro Brenes
May Institute on Computation & Statistics for MS and Proteomics is taking great shape. Fantastic new and repeat instructors and lots of new content. We are grateful to our sponsors Fragmatics and Biognosys. Keep an eye on the website computationalproteomics.khoury.northeastern.edu
November 10, 2025 at 4:39 PM
Reposted by Alejandro Brenes
📣 Paper alert!

I am delighted that our paper exploring the impact of Neanderthal-derived variants on the activity of a disease-associated craniofacial enhancer has been published in Development today!
journals.biologists.com/dev/article/...
November 10, 2025 at 11:11 AM
Reposted by Alejandro Brenes
Proteoforms matter:
Protein functions change due to sequence variants and diverse modifications regulating their activities.

𝐓𝐨 𝐬𝐞𝐞 𝐛𝐢𝐨𝐥𝐨𝐠𝐲 (𝐚𝐧𝐝 𝐝𝐢𝐬𝐞𝐚𝐬𝐞) 𝐜𝐥𝐞𝐚𝐫𝐥𝐲, 𝐰𝐞 𝐧𝐞𝐞𝐝 𝐩𝐫𝐨𝐭𝐞𝐨𝐟𝐨𝐫𝐦-𝐥𝐞𝐯𝐞𝐥 𝐪𝐮𝐚𝐧𝐭𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐚𝐭 𝐬𝐜𝐚𝐥𝐞.

1/2
A beautiful example illustrating a difference between plasma protein analysis by different technologies.

Peptides from some proteoforms correlate better to epitope-based measurements (Olink) than others.

The measurements differ because they reflect different proteoforms !
November 8, 2025 at 3:02 PM
Reposted by Alejandro Brenes
Well done to all our CIR PhD students for their brilliant presentations at last week's Annual Poster Day 🎉! Congratulations to our award winners:

Best Presentation: Marcin Maniak (left)
Best Science: Broc Drury (middle)
Best Poster: Saule Zubyte (right)

@cmvm-edinburghuni.bsky.social
November 7, 2025 at 8:43 AM
🎉Thrilled to share that my Wellcome ECA has been funded.🎉 I'll be using ultra-sensitive proteomics—mini-bulk and single-cell—to map neutrophil functional states in COPD.

Hugely grateful to @wellcometrust.bsky.social, my host @walmsley-lab.bsky.social and @edinuni-irr.bsky.social colleagues 🙏.
November 6, 2025 at 7:05 PM
Reposted by Alejandro Brenes
Looking forward to the BMSS Single cell SIG today!
November 5, 2025 at 9:25 AM
Reposted by Alejandro Brenes
Highlight of @natimmunol.nature.com paper by @mas-g.bsky.social @walmsley-lab.bsky.social showing epigenetic reprogramming of neutrophils in response to hypoxia to reduce lung tissue damage
#immunosky
Hypoxia-induced epigenetic reprogramming of neutrophil progenitors - Nature Reviews Immunology
Sanchez-Garcia et al. report that systemic hypoxia-induced epigenetic reprogramming of neutrophil progenitors in the bone marrow reduces their effector function to limit lung tissue damage.
www.nature.com
November 5, 2025 at 11:43 AM
Reposted by Alejandro Brenes
Ecstatic to share out latest research looking at the role of mitochondrial ABHD11 in controlling T-cell responses. We think this may be a viable target for autoimmunity. Please do give it a read, we would love to hear your thoughts.

www.nature.com/articles/s41...
Mitochondrial ABHD11 inhibition drives sterol metabolism to modulate T-cell effector function - Nature Communications
α/β-hydrolase domain-containing protein 11 (ABHD11) is a mitochondrial hydrolase, and its expression in CD4 + T-cells has been linked to remission status in rheumatoid arthritis. Here the authors repo...
www.nature.com
November 3, 2025 at 10:20 AM
Reposted by Alejandro Brenes
Changes to UniProt proteomes www.ebi.ac.uk/about/...

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#proteomics #prot-other
November 4, 2025 at 5:20 PM
Reposted by Alejandro Brenes
pmultiqc: An open-source, lightweight, and metadata-oriented QC reporting library for MS proteomics www.biorxiv.org/cont...

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#proteomics #prot-preprint
November 4, 2025 at 3:40 PM
Reposted by Alejandro Brenes
Hey @asms.org peeps. I’m running for VP for programs and I’d like your vote. Check out the asms web site for details and you will see an email with voting instructions in the near future. I approach this position with lots of experience organizing scientific conferences & I ❤️ asms. Please re-sky.
a spongebob squarepants scene with a mailbox and a flower
ALT: a spongebob squarepants scene with a mailbox and a flower
media.tenor.com
October 28, 2025 at 4:39 PM
#Neutrophils are short lived cells, yet in ARDS display long term changes, with impaired neutrophil functions even after 6 months. How can they undergo long term reprogramming?

this is what @mas-g.bsky.social answered, mapping changes to neut. progenitors. @walmsley-lab.bsky.social #immunosky
Hypoxia induces histone clipping and H3K4me3 loss in neutrophil progenitors resulting in long-term impairment of neutrophil immunity - Nature Immunology
Walmsley and colleagues report that systemic hypoxia induces persistent loss of histone H3K4me3 marks and epigenetic reprogramming in neutrophil progenitors, resulting in long-term impairment of subse...
www.nature.com
October 28, 2025 at 11:55 AM
Reposted by Alejandro Brenes
Our most recent work entitled “Hypoxia induces histone clipping and H3K4me3 loss in neutrophil progenitors resulting in long-term impairment of neutrophil immunity” is now published. Well done @mas-g.bsky.social. rdcu.be/eM5MT
Hypoxia induces histone clipping and H3K4me3 loss in neutrophil progenitors resulting in long-term impairment of neutrophil immunity
Nature Immunology - Walmsley and colleagues report that systemic hypoxia induces persistent loss of histone H3K4me3 marks and epigenetic reprogramming in neutrophil progenitors, resulting in...
rdcu.be
October 28, 2025 at 11:24 AM
Reposted by Alejandro Brenes
Very concerning.

New research coordinated by the European Broadcasting Union (EBU) and led by the BBC has found that AI assistants – already a daily information gateway for millions of people – routinely misrepresent news content no matter which language, territory, or AI platform is tested.
October 26, 2025 at 2:22 PM
Reposted by Alejandro Brenes
We are delighted to inform you that BSPR 2026 will be held at the @ebi.embl.org campus in Cambridge from the 13th to the 15th of July. Make sure to save the data and join us for the a meeting full of great science focused on British & Irish Proteomics.

#proteomics #BSPR2026 #massspectrometry
October 26, 2025 at 12:35 PM
Reposted by Alejandro Brenes
Excited to see this published in JPR. For years I've wanted a simple way to standardize the signal between instruments. We use the precision of an intraspectrum ratio to assess the relationship between the reported signal and the number of ions. pubs.acs.org/doi/10.1021/...
Evaluation of a Prototype Orbitrap Astral Zoom Mass Spectrometer for Quantitative Proteomics─Beyond Identification Lists
Mass spectrometry instrumentation continues to evolve rapidly, yet quantifying these advances beyond conventional peptide and protein detections remains challenging. Here, we evaluate a modified Orbit...
pubs.acs.org
October 22, 2025 at 3:32 PM
Reposted by Alejandro Brenes
Several years before onset of symptoms of multiple sclerosis, there is evidence of central nervous system myelin injury
nature.com/articles/s41...
Myelin injury precedes axonal injury and symptomatic onset in multiple sclerosis - Nature Medicine
Myelin damage in multiple sclerosis can be detected up to 7 years before symptoms, with early immune pathway activation and a 21-protein panel showing promise for presymptomatic diagnosis.
nature.com
October 20, 2025 at 4:24 PM
Reposted by Alejandro Brenes
CNPN2025 will be held on November 8th to kick off HUPO2025!

We have the honor to introduce our keynote speaker and fantastic invited speaker 🥳
@kislingerthomas.bsky.social and @philipplange.bsky.social

For more info about the program: cnpn.ca/cnpn2025/

#precisionmedicine #biomarkerdiscovery
October 17, 2025 at 7:39 PM
Reposted by Alejandro Brenes
Our universal peptide spectrum Annotator (and codebase rustyms) is now published in Analytical Chemistry, check it out!
pubs.acs.org/doi/10.1021/...
github.com/snijderlab/a...
github.com/jspaezp/rust...
A Universal Spectrum Annotator for Complex Peptidoforms in Mass Spectrometry-Based Proteomics
Accurate and comprehensive peptide spectrum annotation is a crucial step to interpreting mass spectrometry-based proteomics data. While peak assignment in peptide fragmentation spectra is central to a broad range of proteomics applications, current tools tend to be specialized to a specific task. Here, we present a more comprehensive interactive graphical tool (Annotator), along with the underlying codebase written in Rust (rustyms). Annotator enables unified spectrum annotation for bottom-up, middle-down, top-down, cross-linked, and glycopeptide fragmentation mass spectra from all fragmentation methods, including all ion types: a/b/c, x/y/z, d/v/w, and immonium ions. The Annotator integrates all known post-translational modifications from common databases and additionally allows for the definition of custom fragmentation models and modifications. Modifications allow for diagnostic fragment ions, site-specific neutral losses, and multiple breakage sites for cross-linkers. The underlying library used for the theoretical fragmentation and matching is based on the unified peptidoform notation ProForma 2.0 and is made available as a Rust library with Python bindings. This enables spectrum annotation in an interactive, graphical interface of diverse and complex peptidoforms across the broad range of mass spectrometry-based proteomics applications.
pubs.acs.org
October 14, 2025 at 2:02 PM
Reposted by Alejandro Brenes
proteomicsnews.blogspot.com/2025/10/its-... -- Monday November 10th at 2pm! Main exhibit hall! Kebab vendors watch out, I'm heading to Toronto with secret special guest(s?)
It's official! The Proteomics Show will be live at International HUPO!
Since no one asked for it (and ASMS ignored me)!  THE Proteomics Show will record live at International HUPO on Monday, November 10th. Mai...
proteomicsnews.blogspot.com
October 14, 2025 at 10:45 AM
Saw the term "Single Live-Cell Mass Spectrometry (SiLC-MS) using the tims-TOF Ultra system, a technology capable of capturing minute protein quantities in single cells"

I dont think we need a new term to describe what everyone is already doing...
October 13, 2025 at 2:10 PM
Reposted by Alejandro Brenes
A genome-to-proteome map reveals how natural variants drive proteome diversity and shape fitness www.science.org/doi/...

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#proteomics #prot-paper
October 10, 2025 at 1:20 PM