The proper placenta's structure and function are essential conditions to correct pregnancy's and labour's course. Nowadays the role of epigenetics in this organ is more carefully investigated. Some of epigenetics' modifications as DNA methylation, non-coding RNA action or histone modification are able to change the genes' expression without the change of DNA sequence. This phenomenon is particularly intensified in the placenta. Epigenetics placenta's irregularities can be responsible for many pregnancy pathologies, for example spontaneous miscarriage, pre-eclampsia or intrauterine growth retardation, and for many postnatal diseases, such as cancer or mental problems. In the future the monitoring of epigenetics placenta's modifications enables the estimation of pregnancy complications and postnatal diseases risk. Moreover, it will be possible to understand the role of epigenetics in functions the different kinds of cells, including cancer cells.
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PLoS Biol
January 2025
Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, Canada.
The role of epigenetics and chromatin in the maintenance of postmitotic neuronal cell identities is not well understood. Here, we show that the histone methyltransferase Trithorax (Trx) is required in postmitotic memory neurons of the Drosophila mushroom body (MB) to enable their capacity for long-term memory (LTM), but not short-term memory (STM). Using MB-specific RNA-, ChIP-, and ATAC-sequencing, we find that Trx maintains homeostatic expression of several non-canonical MB-enriched transcripts, including the orphan nuclear receptor Hr51, and the metabolic enzyme lactate dehydrogenase (Ldh).
View Article and Find Full Text PDFCell Mol Life Sci
January 2025
Department of Clinical Laboratory, Harbin Medical University Cancer Hospital, 150 Haping Road, Harbin, 150081, China.
Non-small cell lung cancer (NSCLC) has emerged as one of the most prevalent malignancies worldwide. N6-methyladenosine (mA) methylation, a pervasive epigenetic modification in long noncoding RNAs (lncRNAs), plays a crucial role in NSCLC progression. Here, we report that mA modification and the expression of the lncRNA stem cell inhibitory RNA transcript (SCIRT) was significantly upregulated in NSCLC tissues and cells.
View Article and Find Full Text PDFJ Exp Bot
January 2025
College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, China.
Flowering, a pivotal plant lifecycle event, is intricately regulated by environmental and endogenous signals via genetic and epigenetic mechanisms. Photoperiod is a crucial environmental cue that induces flowering by activating integrators through genetic and epigenetic pathways. However, the specific role of DNA methylation, a conserved epigenetic marker, in photoperiodic flowering remains unclear.
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February 2025
Medical School, Kunming University of Science and Technology, Kunming, People's Republic of China.
Hepatocellular carcinoma (HCC) is the most common primary liver cancer. Hepatitis B virus (HBV) is the main pathogen for HCC development. HBV covalently closed circular DNA (cccDNA) forms extra-host chromatin-like minichromosomes in the nucleus of hepatocytes with host histones, non-histones, HBV X protein (HBx) and HBV core protein (HBc).
View Article and Find Full Text PDFNucleic Acids Res
January 2025
MOE Key Laboratory of Evolution & Marine Biodiversity and Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao 266003, China.
DNA N6-methyladenine (6mA) is a potential epigenetic mark involved in gene transcription in eukaryotes, yet the regulatory mechanism governing its methyltransferase (MTase) activity remains obscure. Here, we exploited the 6mA MTase AMT1 to elucidate its auto-regulation in the unicellular eukaryote Tetrahymena thermophila. The detailed endogenous localization of AMT1 in vegetative and sexual stages revealed a correlation between the 6mA reestablishment in the new MAC and the occurrence of zygotically expressed AMT1.
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