0000000000586860

AUTHOR

Emil Karaulanov

showing 3 related works from this author

Impaired DNA demethylation of C/EBP sites causes premature aging

2018

Changes in DNA methylation are among the best-documented epigenetic alterations accompanying organismal aging. However, whether and how altered DNA methylation is causally involved in aging have remained elusive. GADD45α (growth arrest and DNA damage protein 45A) and ING1 (inhibitor of growth family member 1) are adapter proteins for site-specific demethylation by TET (ten-eleven translocation) methylcytosine dioxygenases. Here we show that Gadd45a/Ing1 double-knockout mice display segmental progeria and phenocopy impaired energy homeostasis and lipodystrophy characteristic of Cebp (CCAAT/enhancer-binding protein) mutants. Correspondingly, GADD45α occupies C/EBPβ/δ-dependent superenhancers …

0301 basic medicinePremature agingAgingLipodystrophyDNA damageCell Cycle ProteinsBiology03 medical and health sciencesMiceGeneticsAnimalsHomeostasisEpigeneticsCells CulturedDemethylationMice KnockoutNuclear ProteinsAging PrematureMethylationCell biologyChromatinDNA Demethylation030104 developmental biologyDNA demethylationDNA methylationCCAAT-Enhancer-Binding ProteinsInhibitor of Growth Protein 1Developmental BiologyResearch Paper
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Structural basis of PETISCO complex assembly during piRNA biogenesis in C. elegans

2021

AbstractPiwi-interacting RNAs (piRNAs) constitute a class of small RNAs that bind PIWI proteins and are essential to repress transposable elements in the animal germline, thereby promoting genome stability and maintaining fertility. C. elegans piRNAs (21U RNAs) are transcribed individually from minigenes as precursors that require 5’ and 3’ processing. This process depends on the PETISCO complex, consisting of four proteins: IFE-3, TOFU-6, PID-3, and ERH-2. We employ biochemical and structural biology approaches to characterize the PETISCO architecture and its interaction with RNA, together with its effector proteins TOST-1 and PID-1. These two proteins define different PETISCO functions: P…

Transposable elementStructural biologyChemistryEffectorProtein subunitGeneticsPiwi-interacting RNARNABiologyBinding siteBiogenesisDevelopmental BiologyCell biologyGenes & Development
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Gadd45α modulates aversive learning through post‐transcriptional regulation of memory‐related mRNA s

2018

Abstract Learning is essential for survival and is controlled by complex molecular mechanisms including regulation of newly synthesized mRNAs that are required to modify synaptic functions. Despite the well‐known role of RNA‐binding proteins (RBPs) in mRNA functionality, their detailed regulation during memory consolidation is poorly understood. This study focuses on the brain function of the RBP Gadd45α (growth arrest and DNA damage‐inducible protein 45 alpha, encoded by the Gadd45a gene). Here, we find that hippocampal memory and long‐term potentiation are strongly impaired in Gadd45a‐deficient mice, a phenotype accompanied by reduced levels of memory‐related mRNAs. The majority of the Ga…

Pain ThresholdUntranslated regionRegulatorGene ExpressionCell Cycle ProteinsHippocampusBiochemistryArticlememoryMice03 medical and health sciences0302 clinical medicineGeneticsAnimalsLearningRNA MessengerMolecular BiologyPost-transcriptional regulationGrin2a030304 developmental biologyMice Knockout0303 health sciencesMessenger RNANeuronal PlasticityBehavior AnimalbiologyLong-term potentiationArticlesRNA stabilityAmygdalaRNA BiologyCell biologyGene Expression Regulationbiology.proteinGRIN2ARNA InterferenceMemory consolidationGADD45A030217 neurology & neurosurgeryGadd45aNeuroscienceEMBO reports
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