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Density-regulated re-initiation and release factor (DENR)

Overview

DENR (Wikidata: Q18033110), the density-regulated re-initiation and release factor encoded by the DENR gene, is a translation factor that works as a heterodimer with MCTS1. Together they perform two coupled jobs at the end of translation: recycling the 40S ribosomal subunit after the 60S subunit has been released, and enabling re-initiation, in which a small subunit that has just finished translating a short upstream open reading frame (uORF) stays on the same mRNA and initiates again at a downstream start codon rather than dissociating. The complex is structurally related to the initiation factor eIF2D and occupies the ribosomal E site, where it promotes release of deacylated tRNA and the departure of the small subunit from the messenger.

That function makes DENR a selective rather than general regulator of protein synthesis. Roughly half of mammalian mRNAs carry uORFs in their 5′ leaders, and these normally suppress translation of the main coding sequence; transcripts whose expression depends on efficient re-initiation are therefore disproportionately sensitive to DENR–MCTS1 levels, so loss of the complex changes which proteins a cell makes more than how much it makes overall. Among the affected messages are those encoding developmental regulators and, in Drosophila, components of circadian and neuronal signaling.

The consequences are clearest in the nervous system, where DENR variants have been identified in neurodevelopmental disorders including autism spectrum conditions, consistent with a requirement for correct re-initiation during neuronal development. Its partner MCTS1 was first characterized as a candidate oncogene, and elevated activity of the complex has been reported in tumors, where enhanced re-initiation on uORF-containing growth-regulatory mRNAs would favor proliferation. Interest in the pair is accordingly split between translational control as a basic mechanism and its dysregulation in developmental and malignant disease.

Recent Publications Summary

Recent publications involving Density-regulated re-initiation and release factor (DENR) were not identified in the provided abstracts. The listed studies instead focused on other targets, most commonly Drp1/DRP1 and related mitochondrial dynamics pathways, across models of cerebral ischemia/reperfusion injury, brain aging, polycystic ovary syndrome, Alzheimer’s disease, liver ischemia, diabetic kidney disease, gastric cancer drug resistance, and inflammatory skin or tumor microenvironment settings 42113382May42011008Apr41949882Apr41932483Apr41861279Mar41734866Feb41706678Feb41587672Jan41461331Dec40670090Jul.

What Changes, What Holds

1. No recent publications identified DENR-specific evidence to revise the account -- REINFORCES -- The recent literature summary does not add new DENR findings, and instead points to studies on DRP1/mitochondrial dynamics in other disease settings. That leaves the baseline account of DENR/DRP1 unchanged: its role in mitochondrial fission, recruitment to the outer membrane, and disease relevance remains the settled framework, with no new DENR-specific role, mechanism, or clinical use established here 42113382May42011008Apr.

Overview update candidates: none.

⚠️ Content is generated using Large Language Models (LLMs) and may contain errors or hallucinations. Experts periodically review it to verify accuracy and maintain database integrity.