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Indra

@indrasingh.bsky.social
83 followers 250 following 27 posts

Aging | Leukemia | HSCs heterogeneity | lineage tracing | Chromatin

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Reposted by Indra
Nature @nature.com · 01/06/2026
Bad experiences with supervisors are common among early-career researchers and one of the leading reasons they leave academia go.nature.com/4dTTEgr
go.nature.com
Poor supervision is pushing young researchers out of academia
A survey finds that academic supervisors can have a huge impact on their students’ mental health.
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Indra @indrasingh.bsky.social · 14/02/2026
Loving Boston (yes, the snow as well). If you are around and work on similar things, or just passionate about science and would like to grab coffee and chat, DM me. #postdoclife
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Indra @indrasingh.bsky.social · 14/02/2026
Been a while, finished my PhD last March, moved to Boston in April, and excited about starting as a postdoc in the Buenrostro lab at the Broad. I will be continuing within hematopoiesis, this time asking how psychosocial stress and resultant endocrine signalling shape HSC fate.
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Indra @indrasingh.bsky.social · 14/02/2026
Bonus: you won’t mind Boston humor (it’s a acquired taste). Happy to chat about the role + projects in the lab + the city, speaking as someone with ~8 months of Boston experience. This could be a great fit if you’re graduating and want ~2 years of research experience before PhD.
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Indra @indrasingh.bsky.social · 14/02/2026
Come join us 🙂 The Buenrostro lab at the Broad is looking for a few Research Associates to start ~Summer 2026. If you’re comfortable with rodents, excited about single-cell tech, and weirdly into hematopoiesis… you’ll fit right in. www.buenrostrolab.com
buenrostrolab.com
Buenrostro Lab
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Indra @indrasingh.bsky.social · 14/02/2026
Grant writing is such a humbling experience, you read enough to think you can write… then you start writing, just to realise, how reading more might not be a bad idea too, lol..
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Reposted by Indra
Nature @nature.com · 24/09/2025
Nature research paper: Basal cell of origin resolves neuroendocrine–tuft lineage plasticity in cancer go.nature.com/3ViRTAP
go.nature.com
Basal cell of origin resolves neuroendocrine–tuft lineage plasticity in cancer - Nature
Basal cells, rather than neuroendocrine cells, have been identified as the probable origin of small cell lung cancer and other neuroendocrine–tuft cancers, explaining neuroendocrine–tuft heterogeneity and offering new perspectives for targeting lineage plasticity.
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Reposted by Indra
Elizabeth McKenna @elizsmckenna.bsky.social · 24/09/2025
Now online in Cancer Discovery @aacrjournals.bsky.social: Development and Prospective Validation of a Cell-free DNA-based Model for the Early Detection of Pancreatic Cancer - by Xiuchao Wang, Hongwei Wang, Meng Zhang, Jun Yu, Chuntao Gao, Yunfeng Cui, Jihui Hao, et al. doi.org/10.1158/2159...
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Reposted by Indra
Leif S. Ludwig @leifludwig.bsky.social · 24/09/2025
🚨 New preprints from our lab!
First, we introduce Cryo-mtscATAC-seq, led by Maren (@ms-maren.bsky.social ), enabling high-throughput clonal tracing from frozen human samples by isolating nuclei with their mitochondria (“CryoCells”).
👉 www.biorxiv.org/content/10.1...
biorxiv.org
Cryo-mtscATAC-seq for single-cell mitochondrial DNA genotyping and clonal tracing in archived human tissues
High-throughput clonal tracing of primary human samples relies on naturally occurring barcodes, such as somatic mitochondrial DNA (mtDNA) mutations detected via single-cell ATAC-seq (mtscATAC-seq). Fr...
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Reposted by Indra
Nature Biotechnology @natbiotech.nature.com · 23/05/2025
EPI-Clone is a transgene-free lineage tracing method that uses single-cell DNA methylation analysis to track hematopoietic stem cell clones over time #NBThighlight www.nature.com/articles/s41...
nature.com
Clonal tracing with somatic epimutations reveals dynamics of blood ageing - Nature
The discovery that DNA methylation of different CpG sites can serve as digital barcodes of clonal identity led to the development of EPI-Clone, an algorithm that enables single-cell lineage tracing th...
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Reposted by Indra
Nature Biotechnology @natbiotech.nature.com · 02/04/2025
CRISPRai simultaneously activates and represses two genes in single cells go.nature.com/4apFU9q rdcu.be/efe0E
go.nature.com
Bidirectional epigenetic editing reveals hierarchies in gene regulation - Nature Biotechnology
CRISPRai simultaneously activates and represses two genes in single cells.
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Reposted by Indra
Maya Voichek @mayavoichek.bsky.social · 17/03/2025
1/ Transposable elements are often called "jumping genes" because they mobilize within genomes. 🧬 But did you know they can also jump 𝘣𝘦𝘵𝘸𝘦𝘦𝘯 cells? 🤯 Our new study reveals how retrotransposons invade the germline directly from somatic cells. www.biorxiv.org/content/10.1... A short thread 🧵👇
Drosophila follicle showing retrotransposons (pink & yellow) expressed in somatic cells infecting the oocyte
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Reposted by Indra
Nature Biotechnology @natbiotech.nature.com · 18/03/2025
Information storage across a microbial community using universal RNA barcoding - @lauren-stadler.bsky.social @joffsilberg.bsky.social go.nature.com/440gL5E
go.nature.com
Information storage across a microbial community using universal RNA barcoding - Nature Biotechnology
Barcoding microbial ribosomal RNA creates a recording of gene transfer events without requiring translation.
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Reposted by Indra
Michael Scherer @scherermich.bsky.social · 12/03/2025
New paper out in @bloodjournal.bsky.social. In this study lead by Daria Karpova and Hector Encabo, we investigated the effect of frequent blood donations (FD) on clonal hematopoiesis (CH). Briefly, FD selects for DNMT3A mutations rendering HSC sensitive to stimulation by EPO. doi.org/10.1182/bloo...
doi.org
Clonal Hematopoiesis Landscape in Frequent Blood Donors
Key Points. CH Analysis of a unique and uniform cohort of exclusively healthy individuals exposed to a novel type of selection pressureIdentification of no
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Reposted by Indra
Elisabetta Mereu @elimereu.bsky.social · 12/03/2025
🚀 Join the #ISCO2025 community at @mdc-berlin.bsky.social on May 12-13! 🚀 Don't miss this incredible opportunity to connect with top #singlecell & #spatial omics experts and participate in a special Workshop led by @itaiyanai.bsky.social. ⏳Abstract submissions: March 21) www.isco-conference.eu
isco-conference.eu
ISCO - ISCO
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Broad Institute @broadinstitute.org · 12/03/2025
New spatial method, Perturb-FISH, combines imaging-based spatial transcriptomic measurements with CRISPR screening to reveal effects within and between cells. #Science
broad.io
New technology puts a spatial lens on CRISPR screening
Perturb-FISH reveals impacts of perturbations on gene expression and phenotype with single-cell, spatial resolution, allowing study of effects within and between cells.
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Reposted by Indra
Indra @indrasingh.bsky.social · 27/02/2025
Want to track clonality in organoids, cancer models, or in vivo transplants? Try our STRACK barcoding libraries from Addgene: www.addgene.org/233208/ www.addgene.org/233210/ www.addgene.org/233209/. If you need help establishing it, reach out—happy to collaborate and troubleshoot
addgene.org
Addgene: pLARRYv2-EGFP
Plasmid pLARRYv2-EGFP from Dr. Alejo Rodriguez-Fraticelli's lab is published in Cell Stem Cell. 2025 Apr. doi: 10.1016/j.stem.2025.01.012 This plasmid is available through Addgene.
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Indra @indrasingh.bsky.social · 27/02/2025
Want to track clonality in organoids, cancer models, or in vivo transplants? Try our STRACK barcoding libraries from Addgene: www.addgene.org/233208/ www.addgene.org/233210/ www.addgene.org/233209/. If you need help establishing it, reach out—happy to collaborate and troubleshoot
addgene.org
Addgene: pLARRYv2-EGFP
Plasmid pLARRYv2-EGFP from Dr. Alejo Rodriguez-Fraticelli's lab is published in Cell Stem Cell. 2025 Apr. doi: 10.1016/j.stem.2025.01.012 This plasmid is available through Addgene.
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Indra @indrasingh.bsky.social · 27/02/2025
Clonal analysis shows that clones reliant on Dnmt3a for HSC retention are primed to resist Npm1c reprogramming—driving a Gata1-lineage bias. In contrast, clones maintaining HSCs even without Dnmt3a undergo more pronounced Npm1c-driven reprogramming.
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Indra @indrasingh.bsky.social · 27/02/2025
Gene expression analysis shows both Npm1c-only and Dnmt3a/Npm1c HSCs upregulate Npm1c signature genes. However, Npm1c-only cells activate Myc, E2F, and mTOR/PI3K programs, whereas the double mutants suppress these pathways, shifting fate bias.
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Indra @indrasingh.bsky.social · 27/02/2025
Our sequential mutagenesis experiments reveal that combining Dnmt3a‑R878H and Npm1c mutations produces a synergistic effect—with over 60% of clones retaining HSC identity, far exceeding the outcome of either mutation alone.
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Indra @indrasingh.bsky.social · 27/02/2025
Since most AML cases with Npm1c mutations are preceded by somatic mutations in epigenetic regulators like DNMT3A, we employed STRACK to track stem cell clones and assess mutational synergy
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Indra @indrasingh.bsky.social · 27/02/2025
Interestingly, our tdTom+ vs. tdTom– Npm1c gene signatures mirror the mature vs. primitive signatures from patient GSEA—pointing to cell-of-origin as a key driver of heterogeneity in AML!
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Indra @indrasingh.bsky.social · 27/02/2025
Using above mentioned Flt3-Cre system we then can separate HSCs by intrinsic fitness and found that low-fitness (tdTom⁺) HSCs, when mutated with Npm1c, shift into a primitive, low-output state with heightened Hox/Pbx/Meis activation, in line to our ex-vivo data
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Indra @indrasingh.bsky.social · 27/02/2025
Since Flt3 marks low‐fitness, high‑output HSCs, we crossed Flt3‑Cre; LSL‑tdTom reporter to Npm1c models to validate in vivo, the distinct reprogramming of HSCs sub-compartment by Npm1c mutation pmc.ncbi.nlm.nih.gov/articles/PMC... www.nature.com/articles/s41...
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Indra @indrasingh.bsky.social · 27/02/2025
Even more intriguingly, sister clone analysis revealed that Npm1c reprograms HSC fate in a heritable manner: clones with high output in WT become more primitive and differentiation-blocked upon mutation, while low-output clones mature.
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Indra @indrasingh.bsky.social · 27/02/2025
Remarkably, by day 27, Npm1c mutant HSCs not only expanded robustly with near-perfect clonality but also exhibited a striking HSC-like state.
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Indra @indrasingh.bsky.social · 27/02/2025
We next wondered if our ex vivo expansion cultures could capture mutation-specific reprogramming. Given that Npm1c is known to massively upregulate stemness program—we set out to test its impact at clonal resolution using our STRACK system. www.science.org/doi/10.1126/...
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Indra @indrasingh.bsky.social · 27/02/2025
Intriguingly, R878H HSCs and MPPs display reduced expression of early response genes, suggesting dampened inflammatory activation may underlie their competitive expansion.
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Indra @indrasingh.bsky.social · 27/02/2025
Dnmt3a‑R878H mutant HSC clones expand more robustly than their WT sisters. While overall behaviors appear similar, most R878H clones gain extra HSCs—reprogramming differentiation‑biased cells to favor self‑renewal.
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Indra @indrasingh.bsky.social · 27/02/2025
Next, To investigate how different cancer driver mutations influence stem cell fates, we performed STRACK on E-SLAM HSCs from a mouse model carrying conditional knockin of Dnmt3a-R878H mutation (R878H) that can be activated using cre recombinases
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Indra @indrasingh.bsky.social · 27/02/2025
Our ex vivo cultures recapitulate not only the functional and transcriptional heterogeneity but also showed long-term maintenance and propagation of these programs. Providing unparalleled clonal resolution to explore how cancer driver mutations further shape these dynamics.
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Indra @indrasingh.bsky.social · 27/02/2025
Despite starting from a pure HSC pool, we observed a gradual loss of clonality, Our fate heatmaps revealed a spectrum of behavior patterns: some clones initiate early, producing committed progeny yet fading over time, while others emerge later and persist with robust self-renewal
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Indra @indrasingh.bsky.social · 27/02/2025
Labeled HSC clones tracked over 27 days showed a spectrum of differentiation and self-renewal behavior
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Indra @indrasingh.bsky.social · 27/02/2025
But can long‐term ex vivo HSC cultures truly mimic native stem cell heterogeneity? To establish this, we first labeled and tracked WT HSCs and their progeny for 27 days to understand the dynamic of expanded culture.
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Indra @indrasingh.bsky.social · 27/02/2025
To address these discrepancies we developed STRACK which combines a genetic barcoding tool allowing state-fate mapping, ex-vivo expansion culture and transgenic mice containing floxed AML driver mutation www.science.org/doi/10.1126/... www.nature.com/articles/s41... www.nature.com/articles/s41...
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Indra @indrasingh.bsky.social · 27/02/2025
More recently, advances in single-cell technologies revealed that stem-progenitor cells, once deemed homogeneous due to surface markers, are highly diverse in both transcriptional and functional profiles. www.cell.com/cell/fulltex... www.cell.com/cell/fulltex... www.nature.com/articles/nat...
cell.com
Transcriptional Heterogeneity and Lineage Commitment in Myeloid Progenitors
Single-cell transcriptomic analysis of bone marrow myeloid progenitor populations reveals early transcriptional priming toward seven different fates and absence of progenitors of mixed lineages, chall...
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Indra @indrasingh.bsky.social · 27/02/2025
Previous efforts across different fields to study the cancer cell‐of‐origin model, have suggested that the type of cell acquiring driver mutations is very important and dictates tumor behavior. www.nature.com/articles/nat... www.nature.com/articles/nat... www.nature.com/articles/leu...
nature.com
Crypt stem cells as the cells-of-origin of intestinal cancer - Nature
Intestinal tumours can originate from Lgr5+ intestinal stem cells after genetic activation of the Wnt signalling pathway.
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Indra @indrasingh.bsky.social · 27/02/2025
Beyond excited to say my first PhD paper is out today in @CellStemCell 📷. Here, we explored the role of epigenetic heterogeneity on malignant expansion, using a new approach called STRACK www.cell.com/cell-stem-ce...
cell.com
Pre-existing stem cell heterogeneity dictates clonal responses to the acquisition of leukemic driver mutations
Singh, Fernandez-Perez, et al. use hematopoietic stem cell barcoding to study clones with and without activation of cancer driver mutations, identifying that pre-existing stem cell states can dictate ...
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IRB Barcelona @irbbarcelona.org · 25/02/2025
🧪New technique reveals how the same mutations give rise to very different types of #leukaemia. 📰 Cell Stem Cell, supported by #CRISContraelCáncer. ✍️ Indranil Singh, Daniel Fernández-Pérez, Pedro Sánchez Sánchez, @alejofraticelli.bsky.social. ➡️ bit.ly/3QyrAnJ 📌 doi.org/10.1016/j.st...
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Teif lab @teiflab.bsky.social · 14/01/2025
Here is a growing list of conferences and schools in gene regulation for 2025 generegulation.org/conferences-.... You can order/filter this list by the date, deadline, location. Please reply here to suggest new events* *should be specific to gene regulation
generegulation.org
Conferences & Schools – 2025 – Gene Regulation – Teif Lab
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Nature Portfolio @natureportfolio.nature.com · 18/01/2025
Epidemiological studies have linked dirty air to dementia and other brain disorders. Nature reports on how researchers are trying to determine how pollutants do their damage, and how much harm they cause. 🧪
go.nature.com
Air pollution and brain damage: what the science says
Epidemiological studies have linked dirty air to dementia and other brain disorders. Now researchers are trying to determine how pollutants do their damage, and how much harm they cause.
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Jeff Mold @jeffmold.bsky.social · 16/01/2025
Very interesting work - @alejofraticelli.bsky.social @shalinhnaik.bsky.social www.nature.com/articles/s41...
nature.com
High-resolution, noninvasive single-cell lineage tracing in mice and humans based on DNA methylation epimutations - Nature Methods
This work presents a computational tool MethylTree to infer cell lineages based on epimutations on DNA methylation.
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Anders Sejr Hansen @andersshansen.bsky.social · 16/01/2025
Excited to share James Jusuf's preprint: By integrating Micro-C with SuperRes Live-Imaging we can calibrate genomics&imaging to perform absolute quantification of looping (e.g. this loop is present 3%) We quantify mESC 36k loops: <loops> are generally rare (2.3%) www.biorxiv.org/content/10.1...
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danapeer.bsky.social @danapeer.bsky.social · 31/12/2024
Sometimes, the exciting papers with more surprising findings have a harder time in the current scientific community. This is such an example. I think how cells remember past exposures and how this impacts their future fates is still poorly understood.
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Luis G. Palma @luigalpal.bsky.social · 31/12/2024
Chromatin-based memory as a self-stabilizing influence on cell identity | Genome Biology #Chromatin #CellFate #Review genomebiology.biomedcentral.com/articles/10....
genomebiology.biomedcentral.com
Chromatin-based memory as a self-stabilizing influence on cell identity - Genome Biology
Cell types are traditionally thought to be specified and stabilized by gene regulatory networks. Here, we explore how chromatin memory contributes to the specification and stabilization of cell states...
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Edouard Hannezo @ehannezo.bsky.social · 17/12/2024
Happy to share the latest work from Preeti Sahu, with Adriana Sanchez-Danes on the biomechanics of cell fate choices during tumor initiation! We implement/test a 3D vertex model with proliferation and fate choices for multilayered tissues! See 🧵 below (1/n) bit.ly/3ZXxJzk
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Itai Yanai @itaiyanai.bsky.social · 29/12/2024
The big 4 of grant writing: 1. Credibility: The topic fits your expertise 2. Narrative: It's clear what is the problem, the solution, and why you’re the right person for it 3. Juicy details: Flex your mastery of the topic 4. The concept: You connect every part to the big question
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Antoine Zalc @antoinezalc.bsky.social · 19/12/2024
Extremely cool system for in vitro culture! Synthetic organizer cells, engineered to spatially self-assemble around stem cells, can be used to create specific morphogen gradients and systematically guide in vitro development Congrats to everyone involved! www.cell.com/cell/abstrac...
cell.com
Synthetic organizer cells guide development via spatial and biochemical instructions
Synthetic organizer cells, engineered to spatially self-assemble around stem cells, can be used to create specific morphogen gradients and systematically guide in vitro development.
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Karun Kiani @karun-kiani.bsky.social · 11/12/2024
This is so cool
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