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Posts by Mark Hartmann

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4 days ago 0 0 0 0
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Editors’ Picks, March 2026: Pediatric Leukemia Development, Low-dose Tamoxifen Use, and More In March, AACR's journals editors highlighted studies on the development of pediatric leukemia, the use of low-dose tamoxifen, and more.

Editors’ Pick by Cancer Research Catalyst @aacrjournals.bsky.social

RAS-driven plasticity and oncofetal reprogramming as a key mechanism and vulnerability in JMML.

The article is freely available for a limited time:
www.aacr.org/blog/2026/03...

#hematology
#oncology
#epigenetics
#development

1 week ago 5 2 0 0

Looking forward to a great scientific program with @bethpsaila.bsky.social, Simón Méndez-Ferrer, Jian Xu and many more exciting short talks.

Join us on April 16 to discuss developmental programs in leukemia.

@isehsociety.bsky.social

2 weeks ago 1 0 0 0

Excited to present our work at the 2026 #ISEH Mini Symposium!

“Beyond the Maturation Block: Oncofetal Reprogramming and Stem Cell Plasticity in Pediatric Leukemia”

Join us on April 16 to discuss developmental programs in leukemia and beyond.
iseh.org/Webinars-Eve...

2 weeks ago 7 2 1 0
Molecular Plasticity Results in Oncofetal Reprogramming and Therapeutic Vulnerabilities in Juvenile Myelomonocytic Leukemia AbstractPersistent fetal gene expression in childhood neoplasms is usually explained by a maturation block originating in the prenatal phase. In contrast, reactivation of fetal genes in adult malignan...

JMML stem cells aren’t epigenetically “stuck” in a fetal state.

They mature postnatally—yet show striking transcriptional plasticity, with oncofetal reprogramming in high-risk disease, challenging the classic “maturation block” model.
doi.org/10.1158/2643...

#JMML #epigenetics #hematology #cancer

2 months ago 4 2 0 0
Ontogeny Dictates Oncogenic Potential, Lineage Hierarchy, and Therapy Response in Pediatric Leukemia AbstractAccumulating evidence links pediatric cancers to prenatal transformation events, yet the influence of the developmental stage on oncogenesis remains elusive. We investigated how hematopoietic ...

Same mutation ≠ same leukemia.

Wagenblast et al. show:
• fetal HSCs readily transform
• postnatal HSCs become resistant
• fetal programs create targetable vulnerabilities

Ontogeny matters: state-of-origin shapes biology & therapy response.
doi.org/10.1158/2159...

#pediatric #AML #stemcells

2 months ago 4 3 1 0
A Triumvirate of Transformation: Oncogene, Ontogeny, and Plasticity Summary:. Cancer cells display extensive heterogeneity that influences therapy response and clinical outcome, yet the underlying mechanisms remain incompletely understood. Recent studies reveal that t...

New Spotlight in @aacrjournals.bsky.social

#Oncogene × #Ontogeny × #Plasticity shape leukemia biology & therapy response.

Two complementary studies show: mutations alone don’t explain disease behavior—developmental state and cellular plasticity matter.

aacrjournals.org/bloodcancerd...

🩸🧬
EpiSci

2 months ago 7 4 1 0
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You keep us on tenterhooks, what are those exciting discoveries??? 😲

Looking forward to find out more, hopefully some time soon.
😉

2 months ago 1 0 1 0
Molecular Plasticity Results in Oncofetal Reprogramming and Therapeutic Vulnerabilities in Juvenile Myelomonocytic Leukemia Abstract. Persistent fetal gene expression in childhood neoplasms is usually explained by a maturation block originating in the prenatal phase. In contrast, reactivation of fetal genes in adult malign...

Absolutely, we see pronounced fetal signatures in JMML, too:

aacrjournals.org/bloodcancerd...

Unfortunately, LIN28B is not well captured in the scRNA data. However, I remember clusters revealing pronounced b-catenin expression patterns.
Will check this again… maybe we can find shared programs.

2 months ago 1 0 1 0

Exciting topic! Looking forward to reading this preprint.

2 months ago 1 0 1 0
Dual targeting a LIN28B:β-catenin axis in acute myeloid leukaemia Wnt/β-catenin signalling is dysregulated across several haematological malignancies, including acute myeloid leukaemia (AML), where is lacks effective targeting strategies. Previously, we discovered that β-catenin interacts with several RNA-binding proteins (RBP), and binds mRNA indirectly, indicating contributions to the post-transcriptional landscape of leukaemia cells. Here, we found the most frequent RBP-binding motif amongst β-catenin-bound mRNAs was the GGAG motif targeted by the oncofoetal expressed miRNA-regulating RBP LIN28B. We detected the β-catenin:LIN28B interaction in lymphoid and myeloid cell lines, and primary human CD34⁺ fetal liver-derived haematopoietic stem cells. LIN28B positively regulated Wnt signalling capacity by regulating LEF1 expression through a post-transcriptional mechanism requiring the let7 miRNA axis. Further miRNA sequencing of β-catenin- and LIN28B-depleted myeloid cells revealed both potential cooperative and antagonistic function in miRNA regulation. Finally, dual-targeting both β-catenin and LIN28B through either genetic or pharmacological means preferentially killed AML cells. These data reveal a potential novel synthetically lethal relationship in AML which could be exploited in the rare AML subsets where LIN28B expression becomes reactivated ### Competing Interest Statement The authors have declared no competing interest. Kay Kendall Leukaemia Fund, https://ror.org/03j2wfg84, KKL1051, KKL1446 Leukaemia & Myeloma Research UK, 4-5/06.21R Children’s Cancer & Leukaemia Group, CCLGA 2023 16 Morgan Republic of Türkiye Ministry of National Education

Very pleased to share our latest pre-print which showcases the incredible hard work and skill of Dr Okan Sevim.

Our continued exploration of β-catenin's contribution to the post transcriptional landscape of blood cells led us to a LIN28B interaction.

1/7

www.biorxiv.org/content/10.6...

2 months ago 10 3 2 2

Congratulations, Julius and all Co-Authors!

3 months ago 1 0 0 0
Job » Luxembourg Institute of Health Applications including a letter detailing your motivation and a curriculum vitae should be sent through our website via the apply button below.

🚨We have an opening for Data Scientists or Bioinformaticians using machine learning and AI with all kinds of molecular data to support cancer research. 🧬
Permanent position, fantastic team, exciting projects—what more could you ask for?
www.lih.lu/en/job/?valu...

3 months ago 4 3 0 0

Out in print this week @bloodjournal.bsky.social . Very proud of this collaborative work with Prof Karadimitris @imperialimmuno.bsky.social. Thanks to @cancerresearchuk.org and CwC_UK for funding this work. #InfantALL @paediatrics.ox.ac.uk @imm.ox.ac.uk

3 months ago 8 4 0 0

Thanks for sharing our study!

#Kinderkrebs
#Leukämie
@dkfz.bsky.social
@nct-heidelberg.bsky.social

3 months ago 0 0 0 0
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Interesting story about the role of #oncofetal RNA-binding proteins in #immune #evasion in #ovarian #cancer.

3 months ago 0 0 0 0

Epigenetics that matters! Very cool work on hard to hard-to-access cell types . Finally some solid epigenetics examples that should be used in textbooks! Congrats to Mathieu and team @embl.org Rome!

3 months ago 4 2 0 0
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Neue Erkenntnisse zu frühkindlicher Leukämie: Leukämiezellen können Programme aus der fetalen Entwicklung erneut aktivieren. Die Ergebnisse eröffnen neue Angriffspunkte für Diagnostik und Therapie.
www.nct-heidelberg.de/das-nct/news...

@dkfz.bsky.social @mphartmann.bsky.social @dblipka.bsky.social

4 months ago 7 3 0 0

Thank you so much, Tim!!!

And I agree! Our first experience with Blood Cancer Discovery @aacrjournals.bsky.social was really really great. Very quick, communicative and professional, but also absolutely supportive, proactive, flexible and courteous!

4 months ago 4 0 0 0

Of course, it’s always a pleasure to talk to you! :)

4 months ago 0 0 0 0

Thanks, Tim!

I will let him know… ;) unfortunately, he’s not on bluesky.

4 months ago 1 0 1 0

@simonhaas.bsky.social
@mhaniffa.bsky.social
Jan-Philipp Mallm
Sam Behjati
Marc-Jan Bonder
@stefanfrohling.bsky.social
Elliot Stieglitz
Charlotte M. Niemeyer

4 months ago 2 0 0 0

Fatemeh Alikarami
@littleoldmewi.bsky.social
Jun Wang
Tobias Boch
@viktoriaflore.bsky.social
@pavlolutsik.bsky.social
@milsommick.bsky.social
Simon Raffel
Christian Buske

4 months ago 1 0 0 0
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Jovana Rajak
Valentin Maurer
Ling Hai
Katharina Bauer
Mariam Hakobyan
Sina Stäble
Jens Langstein
Laura Jardine
Roland Roelz
Sheila Bohler
Eleonora Khabirova
Abdul-Habib Maag
Dominik Vonficht
Dirk Lebrecht
Katrin M. Bernt
@kaitanlab.bsky.social
Changya Chen

4 months ago 0 0 0 0

Fantastic environment at our host institutes @dkfz.bsky.social & @nct-heidelberg.bsky.social

Thanks to all co-authors of this publication:

4 months ago 3 0 3 0

Deep gratitude to

my friend and shared first co-author Maximilian Schönung

the last authors @joschkah.bsky.social, Christian Flotho, Christoph Plass, Miriam Erlacher, Matthias Schlesner, and especially @dblipka.bsky.social

4 months ago 3 0 2 0
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Multi-omics integration reveals risk-associated gene expression signatures, identifying CD52 as a potential therapeutic target for high-risk JMML.

Anti-CD52 treatment depletes JMML stem cells and disrupts disease propagation in a JMML PDX model.

4 months ago 2 0 1 0
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RAS-pathway mutations induce fetal-like gene expression programs in a JMML mouse model, suggesting RAS-driven oncofetal reprogramming in murine JMML stem cells.

4 months ago 2 0 1 0
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Fetal HSC signatures are enriched in patients without detectable JMML driver mutations at birth.

4 months ago 2 0 1 0
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JMML stem cells show transcriptional plasticity, hijacking parts of distinct developmental programs, including fetal HSC marker genes, leading to mosaic-like developmental expression programs.

This suggests the reactivation rather than preservation of oncofetal signatures.

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