Sahar Melamed
saharmelamed.bsky.social
Sahar Melamed
@saharmelamed.bsky.social
Principal Investigator at the Hebrew University| regulatory small RNAs | RIL-seq | microbiologist | host-pathogen interactions | phages&therapy | antibiotic resistance
Pinned
Happy to join this platform. it is probably makes sense to first introduce our group! We love bacteria and we love RNA! We focus on the role regulatory RNA play in the interaction of bacteria with their surroundings. You can read more about it in our website or here:
www.cell.com/molecular-ce...
Introducing new group leaders: Sahar Melamed
Sahar Melamed spoke with Molecular Cell about his interdisciplinary group at the Hebrew University of Jerusalem, which applies experimental and computational approaches to studying regulatory RNAs in ...
www.cell.com
Reposted by Sahar Melamed
Phage-encoded small RNA hijacks host replication machinery to support the phage lytic cycle: Molecular Cell www.cell.com/molecular-ce...
Phage-encoded small RNA hijacks host replication machinery to support the phage lytic cycle
Using RIL-seq, Silverman et al. map the RNA interactome of E. coli during phage lambda infection and uncover a conserved phage-encoded sRNA that activates host replication machinery. Their findings re...
www.cell.com
December 18, 2025 at 6:44 PM
Do viruses use RNA to rewire bacteria?
Yes!
In our paper in @cp-molcell.bsky.social RIL-seq reveals interkingdom RNA interactions during λ infection. Phages don’t just encode proteins, they use small RNAs to hijack bacterial replication and fine-tune infection.
#RNA #Phage
doi.org/10.1016/j.mo...
Phage-encoded small RNA hijacks host replication machinery to support the phage lytic cycle
Using RIL-seq, Silverman et al. map the RNA interactome of E. coli during phage lambda infection and uncover a conserved phage-encoded sRNA that activates host replication machinery. Their findings re...
www.cell.com
December 19, 2025 at 6:43 AM
Happy Hanukah and happy holiday season from the Melamed lab!
December 16, 2025 at 1:13 PM
Reposted by Sahar Melamed
How does a bacterial small RNA evolve new functions?

Our new study reveals the stepwise evolutionary journey of UhpU, a 3′UTR-derived sRNA in E. coli and relatives. It evolved from a metabolically-focused regulator to one with expanded targets and biogenesis manner.

www.pnas.org/doi/10.1073/...
December 4, 2025 at 7:50 PM
Reposted by Sahar Melamed
Phages are full of genes of unknown function that are likely adaptive in specific conditions.
New preprint: Phage TnSeq identifies essential genes rapidly and knocks all non-essentials. We would like to send a pool of phiKZ mutants to anyone wanting it! Reach out
tinyurl.com/bdcfrejh
December 8, 2025 at 3:04 PM
Reposted by Sahar Melamed
KlebPhaCol paper is now out! Go check it out and see all that we offer.

And when ready, visit our website for more: www.klebphacol.org
November 22, 2025 at 6:19 PM
Reposted by Sahar Melamed
🚨Preprint alert - this is a big one! We transfer the revolutionary power of TnSeq to bacteriophages.

Our HIDEN-SEQ links the "dark matter" genes of your favorite phage to any selectable phenotype, guiding the path from fun observations to molecular mechanisms.

A thread 1/8
November 20, 2025 at 8:40 PM
Cool work by @microberna.bsky.social & Kai Papenfort, presenting the first RNA-RNA map in C. crescentus using RIL-seq, revealing an RNA sponge that controls the transition from nutrient abundance to starvation; new insights into RNA networks and stress responses!
#RNA
www.nature.com/articles/s41...
An RNA sponge directs the transition from feast to famine in Caulobacter crescentus - Nature Communications
In bacteria, many small regulatory RNAs (sRNAs) associate with the RNA chaperone Hfq to modulate gene expression at the post-transcriptional level. Here, the authors identify global Hfq-mediated RNA-R...
www.nature.com
October 30, 2025 at 1:43 PM
Reposted by Sahar Melamed
🔬 To celebrate World Phage Week, this month's issue of the Phage Collection Blog, written by Hana, explores the history of phage therapy. Thanks to @danielarothschild.bsky.social for providing the cover image, showcasing phage ROTH78.

#WorldPhageWeek

www.phage-collection.org/blog/history...
History of Phage Therapy — ThePhageCollectionProject
Phage therapy is not a recent discovery; it dates back to the early 20th century, with two scientists making impactful discoveries within two years of each other. But research priorities shifted towar...
www.phage-collection.org
October 28, 2025 at 5:30 PM
Reposted by Sahar Melamed
CDC reports that the 'nightmare bacteria' with the NDM gene infections rose ~ 70% from 2019–2023 & is resistant to almost all antibiotics.

At GARDP, Shionogi’s approved antibiotic cefiderocol & Bugworks’ BWC0977, now in clinical development, show activity against it.

🔗Read: bit.ly/4pFG05H
‘Nightmare bacteria’ cases are increasing in the U.S.
It’s likely that many people are unrecognized carriers of the drug-resistant bacteria, which could lead to community spread, CDC scientists said.
bit.ly
September 26, 2025 at 6:00 AM
PhD students! Curious about RNA biology, phages & interbacterial interactions? Come spend 3–4 months in my lab through the Azrieli International Visiting PhD Fellowship (ILS 12K/month). Collaborate and experience science & culture together!
azrielifoundation.org/azrieli-fell...
Call for Applications for the Azrieli International Visiting PhD Fellowship - The Azrieli Foundation
The Azrieli International Visiting PhD Fellowship offers outstanding international PhD candidates the opportunity to conduct short-term research in Israel, fostering academic collaboration and strengt...
azrielifoundation.org
September 15, 2025 at 9:43 AM
Wonderful department retreat yesterday! Proud of Hila Robard’s excellent talk about Pseudomonas aeruginosa small RNAs and their physiological impacts!
Big thanks for the organizers Gideon Mamou and Yiska Weisblum!
September 9, 2025 at 4:12 AM
The Melamed and Altuvia labs are on their way to the Meeting on Regulating with RNA in Bacteria and Archaea in #Strasbourg !!! Excited meet old friends and make new ones
#RNA
September 1, 2025 at 11:23 AM
A new cool method developed by the Balaban lab, Microcolony-seq.
A new way to track bacterial phenotypic inheritance, revealing hidden subpopulations in infections.

www.cell.com/cell/fulltex...
Uncovering phenotypic inheritance from single cells with Microcolony-seq
Microcolony-seq systematically uncovers inherited phenotypic diversity directly from infected human samples, revealing that bacteria can retain long-term genetic and nongenetic memory from the host en...
www.cell.com
August 28, 2025 at 10:28 AM
Reposted by Sahar Melamed
tRNA modification profiling reveals epitranscriptome regulatory networks in Pseudomonas aeruginosa 🦠👏High-throughput tRNA epitranscriptome profiling using mass spec on P. aeruginosa transposon insertion library and links with metabolic networks #microsky #rnasky doi.org/10.1093/nar/...
tRNA modification profiling reveals epitranscriptome regulatory networks in Pseudomonas aeruginosa
Abstract. Transfer RNA (tRNA) modifications have emerged as critical post-transcriptional regulators of gene expression affecting diverse biological and di
doi.org
July 28, 2025 at 8:28 PM
I enjoyed attending the annual Israel Society for Microbiology (ISM) meeting. This year held special significance in honoring the memory of two esteemed faculty members, Prof. Herve Bercovier and Prof. Hanna Engelberg-Kulka, who sadly passed away over the past year.
July 24, 2025 at 4:19 AM
Reposted by Sahar Melamed
This is wild!
Engineering E. coli bacteria to turn plastic waste into paracetamol (Tylenol)
www.nature.com/articles/s41...
www.nature.com/articles/s41...
June 23, 2025 at 6:55 PM
Just signed up for the Microbial RNA Meeting! Really looking forward to a few days packed with small RNAs, and catching up with people. Always one of the most inspiring and fun meetings on the calendar 🙂
microbialrnameeting.com

#MicrobialRNA
Microbes & RNA 2025 – 8th Meeting on Regulating with RNA in Bacteria and Archaea
microbialrnameeting.com
May 27, 2025 at 4:22 AM
Reposted by Sahar Melamed
🫴 Wow: A bacterial reverse transcriptase synthesizes long poly-A–rich cDNA for anti phage defense:

👇👇👇

@science.org

www.science.org/doi/10.1126/...
Bacterial reverse transcriptase synthesizes long poly-A–rich cDNA for antiphage defense
Prokaryotic defense-associated reverse transcriptases (DRTs) were recently identified with antiviral functions; however, their functional mechanisms remain largely unexplored. Here we show that DRT9 f...
www.science.org
May 21, 2025 at 3:26 AM
Pizza break on the scenic rooftop of the Hebrew University Faculty of Medicine library with the Melamed and Altuvia labs! @hebrewuniversity.bsky.social
May 16, 2025 at 11:27 AM
Interesting study shows CsrA forms a dynamic, membraneless compartment with sRNAs, mRNAs & the degradosome in E. coli, flipping its role between activating and repressing virulence. A new layer of RNA-based regulation! #microbiology #RNA #CsrA

www.nature.com/articles/s41...
Formation of a membraneless compartment regulates bacterial virulence - Nature Communications
The RNA-binding protein CsrA switches from upregulation to downregulation of virulence genes in bacteria through unclear mechanisms. Here, the authors show that the switch between promoting and repres...
www.nature.com
April 25, 2025 at 9:10 AM