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H4K20me1 and gene expression in adult myocyte hypertrophy

ABSTRACT: The lysine methyltransferase KMT5A is shown to mediate the effects of CDC14A in the adult cardiomyocyte by regulating H4K20 mono-methylation, such that reduced KMT5A expression promotes a phenotype resembling Dilated Cardiomyopathy.

ORGANISM(S): Rattus norvegicus

PROVIDER: GSE318470 | GEO | 2026/02/18

REPOSITORIES: GEO

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Regulation of the Balance between Concentric and Eccentric Cardiac Hypertrophy by a CDC14A-KMT5A Signaling Pathway

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Histone H4 Lysine 20 Methylation Marks Genes Dynamically Regulated During Erythroid Maturation [CUT&Run_2]

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BAHCC1 binds H4K20me1 to facilitate the MCM complex loading for DNA replication

Project description:Methylation of histone H4 lysine 20 (H4K20), such as H4K20 mono-methylation (H4K20me1), regulates the biological processes of DNA replication, cell cycle progression, and DNA damage repair1-4. Whereas H4K20me1 is knowingly written by SET85,6 (also known as PR-Set7) and erased by PHF87 (also known as KDM7B), the mechanism underlying H4K20me1-mediated regulation of DNA replication remains murky. Here, we report that a conserved tandem Tudor domain of BAHCC1 (BAHCC1TTD) specifically reads H4K20me1. Our biochemical, structural and cellular analyses demonstrated that the recognition of H4K20me1 by BAHCC1TTD facilitates the BAHCC1 recruitment onto the replication origins, where BAHCC1 interacts and recruits components of Minichromosome Maintenance (MCM) complex, a critical partner machinery of Origin Replication Complex (ORC) for mediating DNA replication8,9. Combined actions of the H4K20me1-reading BAHCC1 and the H4K20me2-reading ORC ensure optimal genomic loading of MCM proteins. Depletion of BAHCC1, or disruption of BAHCC1TTD:H4K20me1 interaction, affected H4K20me1 homeostasis and MCM complex loading, leading to impaired DNA replication and defective cell cycle progression. Together, this study identifies a conserved BAHCC1TTD as an effector linking H4K20me1 to MCM recruitment for efficient DNA replication.

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H4K20me1 and gene expression in adult myocyte hypertrophy

Project description:H4K20me1 and gene expression in adult myocyte hypertrophy

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BAHCC1 binds H4K20me1 to facilitate the MCM complex loading for DNA replication

Project description:Methylation of histone H4 lysine 20 (H4K20), such as H4K20 mono-methylation (H4K20me1), regulates the biological processes of DNA replication, cell cycle progression, and DNA damage repair. Whereas H4K20me1 is knowingly written by SET8 (also known as PR-Set7) and erased by PHF8 (also known as KDM7B), the mechanism underlying H4K20me1-mediated regulation of DNA replication remains murky. Here, we report that a conserved tandem Tudor domain of BAHCC1 (BAHCC1TTD) specifically reads H4K20me1. Our biochemical, structural and cellular analyses demonstrated that the recognition of H4K20me1 by BAHCC1TTD facilitates the BAHCC1 recruitment onto the replication origins, where BAHCC1 interacts and recruits components of Minichromosome Maintenance (MCM) complex, a critical partner machinery of Origin Replication Complex (ORC) for mediating DNA replication. Combined actions of the H4K20me1-reading BAHCC1 and the H4K20me2-reading ORC ensure optimal genomic loading of MCM proteins. Depletion of BAHCC1, or disruption of BAHCC1TTD:H4K20me1 interaction, affected H4K20me1 homeostasis and MCM complex loading, leading to impaired DNA replication and defective cell cycle progression. Together, this study identifies a conserved BAHCC1TTD as an effector linking H4K20me1 to MCM recruitment for efficient DNA replication.

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Project description:Dilated Cardiomyopathy

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Expression data from human heart right ventricular wall

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Project description:Cardiac metabolism is deranged in heart failure, but underlying mechanisms remain unclear. Lysine demethylase 8 (Kdm8) represses gene expression in the embryo and controls metabolism in cancer. However, its function in cardiac homeostasis is unknown. We show that Kdm8 maintains a mitochondrial gene network active by repressing Tbx15 to prevent dilated cardiomyopathy leading to lethal heart failure. Deletion of Kdm8 in mouse cardiomyocytes increased H3K36me2 with activation of Tbx15 and repression of target genes in the NAD+ pathway before dilated cardiomyopathy initiates. Moreover, NAD+ supplementation prevented dilated cardiomyopathy in Kdm8 mutant mice and TBX15 overexpression blunted NAD+-activated cardiomyocyte respiration. Furthermore, KDM8 was downregulated in human hearts affected by dilated cardiomyopathy and higher TBX15 expression defines a subgroup of affected hearts with the strongest downregulation of genes encoding mitochondrial proteins. Thus, KDM8 represses TBX15 to maintain cardiac metabolism. Our results suggest that epigenetic dysregulation of metabolic gene networks initiates myocardium deterioration towards heart failure and could underlie heterogeneity of dilated cardiomyopathy.

2022-12-23 | GSE215793 | GEO

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