Biology subjects

Porras, L.

Publications and source records attributed to Porras, L..

2 recordsLinked to original sources

bioRxiv2025

EZH2 Inhibition Induces an Integrated Stress Response Driving Glutamine-Dependent Vulnerability in TNBC

EZH2, the catalytic subunit of Polycomb Repressive Complex II, is overexpressed and associated with poor prognosis in triple-negative breast cancer (TNBC). Although EZH2 inhibition induces significant changes in chromatin landscapes and gene expression, it has a limited impact on the growth of TNBC models, suggesting adaptive compensatory mechanisms. Here, we demonstrate that EZH2 inhibition leads to the accumulation of misfolded proteins and double-stranded RNA (dsRNA), triggering an essential integrated stress response (ISR) through PKR and PERK activation. By inducing ISR-mediated ATF4 activation, EZH2 inhibition enhances amino acid flux and promotes glutaminolysis, in turn activating mTOR signaling to support TNBC cell survival. Pharmacological targeting of this metabolic adaptation with a glutaminase (GLS) inhibitor in combination with EZH2 inhibition significantly impairs TNBC cell proliferation and tumor growth. These findings reveal a stress-driven metabolic adaptation that sustains TNBC survival upon EZH2 blockade and highlight inhibition of this pathway as a strategy to enhance the efficacy of EZH2 inhibitors in TNBC.

cancer biology↗

bioRxiv2021

Improved resolution of recalcitrant nodes in the animal phylogeny through the analysis of genome gene content and morphology

An accurate phylogeny of animals is needed to clarify their evolution, ecology, and impact on shaping the biosphere. Although datasets of several hundred thousand amino acids are nowadays routinely used to test phylogenetic hypotheses, key deep nodes in the metazoan tree remain unresolved: the root of animals, the root of Bilateria, and the monophyly of Deuterostomia. Instead of using the standard approach of amino acid datasets, we performed analyses of newly assembled genome gene content and morphological datasets to investigate these recalcitrant nodes in the phylogeny of animals. We explored extensively the choices for assembling the genome gene content dataset and model choices of morphological analyses. Our results are robust to these choices and provide additional insights into the early evolution of animals, they are consistent with sponges as the sister group of all the other animals, the worm-like bilaterian lineage Xenacoelomorpha as the sister group of the other Bilateria, and tentatively support monophyletic Deuterostomia.

evolutionary biology↗