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Histone variants

Siliang Xu, Ping Duan, Jinping Li, Tristan Senkowski, Fengbiao Guo, Haibin Chen, Alberto Romero, Yugui Cui, Jiayin Liu, Shi-Wen Jiang
SET (SE Translocation) protein carries out multiple functions including those for protein phosphatase 2A (PP2A) inhibition, histone modification, DNA repair, and gene regulation. SET overexpression has been detected in brain neurons of patients suffering Alzheimer's disease, follicle theca cells of Polycystic Ovary Syndrome (PCOS) patients, and ovarian cancer cells, indicating that SET may play a pathological role for these disorders. SET transcript 2, produced by a specific promoter, represents a major transcript variant in different cell types...
October 20, 2016: International Journal of Molecular Sciences
Deepika Jaiswal, Rashi Turniansky, Erin M Green
When yeast cells are challenged by a fluctuating environment, signaling networks activate differentiation programs that promote their individual or collective survival. These programs include the initiation of meiotic sporulation, the formation of filamentous growth structures, and the activation of programmed cell death pathways. The establishment and maintenance of these distinct cell fates are driven by massive gene expression programs that promote the necessary changes in morphology and physiology. While these genomic reprogramming events depend on a specialized network of transcription factors, a diverse set of chromatin regulators, including histone-modifying enzymes, chromatin remodelers, and histone variants, also play essential roles...
October 18, 2016: Journal of Molecular Biology
Xiaolu Zhao, Yuanyuan Wang, Yurui Wang, Yifan Liu, Shan Gao
DNA replication elongation is tightly controlled by histone-modifying enzymes. Our previous studies showed that the histone methytransferase TXR1 (Tetrahymena Trithorax related protein 1) specifically catalyzes H3K27 monomethylation and affects DNA replication elongation in Tetrahymena thermophila. In this study, we investigated whether TXR1 has a substrate preference to the canonical H3 over the replacement variant H3.3. We demonstrated by histone mutagenesis that K27Q mutation in H3.3 further aggravated the replication stress phenotype of K27Q mutation in canonical H3, supporting H3...
October 17, 2016: Science China. Life Sciences
Antonia Piazzesi, Dražen Papić, Fabio Bertan, Paolo Salomoni, Pierluigi Nicotera, Daniele Bano
Chromatin structure orchestrates the accessibility to the genetic material. Replication-independent histone variants control transcriptional plasticity in postmitotic cells. The life-long accumulation of these histones has been described, yet the implications on organismal aging remain elusive. Here, we study the importance of the histone variant H3.3 in Caenorhabditis elegans longevity pathways. We show that H3.3-deficient nematodes have negligible lifespan differences compared to wild-type animals. However, H3...
October 18, 2016: Cell Reports
Wei-Lin Wang, David Shechter
Chromatin, primarily a complex of DNA and histone proteins, is the physiological form of the genome. Chromatin is generally repressive for transcription and other information transactions that occur on DNA. A wealth of post-translational modifications on canonical histones and histone variants encode regulatory information to recruit or repel effector proteins on chromatin, promoting and further repressing transcription and thereby form the basis of epigenetic information. During metazoan oogenesis, large quantities of histone proteins are synthesized and stored in preparation for the rapid early cell cycles of development and to elicit maternal control of chromatin assembly pathways...
2016: International Journal of Developmental Biology
Pradyut K Paul, Mary E Rabaglia, Chen-Yu Wang, Donald S Stapleton, Ning Leng, Christina Kendziorski, Peter W Lewis, Mark P Keller, Alan D Attie
Anti-silencing function 1 (ASF1) is a histone H3-H4 chaperone involved in DNA replication and repair, and transcriptional regulation. Here, we identify ASF1B, the mammalian paralog to ASF1, as a proliferation-inducing histone chaperone in human β-cells. Overexpression of ASF1B led to distinct transcriptional signatures consistent with increased cellular proliferation and reduced cellular death. Using multiple methods of monitoring proliferation and mitotic progression, we show that overexpression of ASF1B is sufficient to induce human β-cell proliferation...
October 18, 2016: Cell Cycle
Natalia Papeta, Ami Patel, Vivette D D'Agati, Ali G Gharavi
HIV-1 transgenic mice on the FVB/NJ background (TgFVB) represent a validated model of HIV-associated nephropathy (HIVAN). A major susceptibility locus, HIVAN1, was previously mapped to chromosome 3A1-A3 in a cross between TgFVB and CAST/EiJ (CAST) strains, and introgression of a 51.9 Mb segment encompassing HIVAN1 from CAST into TgFVB resulted in accelerated development of nephropathy. We generated three sub-congenic strains carrying CAST alleles in the proximal or distal regions of the HIVAN1 locus (Sub-II, 3...
2016: PloS One
Sebastian Maciak, Katarzyna Michalak, Shiv D Kale, Pawel Michalak
Nucleolar dominance is a dramatic disruption in the formation of nucleoli and the expression of ribosomal RNA (rRNA) genes, characteristic of some plant and animal hybrids. Here, we report that F1 hybrids produced from reciprocal crosses between 2 sister species of Xenopus clawed frogs, X. muelleri and X. borealis, undergo nucleolar dominance somewhat distinct from a pattern previously reported in hybrids between phylogenetically more distant Xenopus species. Patterns of nucleolar development, 45S rRNA expression, and gene copy inheritance were investigated using a combination of immunostaining, pyrosequencing, droplet digital PCR, flow cytometry, and epigenetic inhibition...
October 12, 2016: Cytogenetic and Genome Research
Pei Zhang, Owen E Branson, Michael A Freitas, Mark R Parthun
BACKGROUND: There are 11 variants of linker histone H1 in mammalian cells. Beyond their shared abilities to stabilize and condense chromatin, the H1 variants have been found to have non-redundant functions, the mechanisms of which are not fully understood. Like core histones, there are both replication-dependent and replication-independent linker histone variants. The histone chaperones and other factors that regulate linker histone dynamics in the cell are largely unknown. In particular, it is not known whether replication-dependent and replication-independent linker histones interact with distinct or common sets of proteins...
October 1, 2016: BMC Biochemistry
Shuyuan Chen, Qin Zhang, Baoling Bai, Shengrong Ouyang, Yihua Bao, Huili Li, Ting Zhang
Dishevelled (DVL/Dvl) genes play roles in canonical and noncanonical Wnt signaling, both of which are essential in neural tube closing and are involved in balancing neural progenitor growth and differentiation, or neuroepithelial cell polarity, respectively. In mouse Dvl haploinsufficiency leads to neural tube defects (NTDs), which represent the second most common birth defects. However, DVL genes' genetic contributions in human NTDs are modest. We sought to explore the molecular impact on such genes in human NTDs in a Han Chinese cohort...
October 6, 2016: Molecular Neurobiology
L S E P W Castro, M R Kviecinski, F Ourique, E B Parisotto, V M A S Grinevicius, J F G Correia, D Wilhelm Filho, R C Pedrosa
This work evaluated the antitumor effects of albendazole (ABZ) and its relationship with modulation of oxidative stress and induction of DNA damage. The present results showed that ABZ causes oxidative cleavage on calf-thymus DNA suggesting that this compound can break DNA. ABZ treatment decreased MCF-7 cell viability (EC50=44.9 for 24h) and inhibited MCF-7 colony formation (~67.5% at 5μM). Intracellular ROS levels increased with ABZ treatment (~123%). The antioxidant NAC is able to revert the cytotoxic effects, ROS generation and loss of mitochondrial membrane potential of MCF-7 cells treated with ABZ...
September 22, 2016: Redox Biology
Aerin Yang, Sura Ha, Jihye Ahn, Rira Kim, Sungyoon Kim, Younghoon Lee, Jaehoon Kim, Dieter Söll, Hee-Yoon Lee, Hee-Sung Park
Many essential biological processes are controlled by post-translational protein modifications. The inability to synthetically attain the diversity enabled by these modifications limits functional studies of many proteins. We designed a three-step approach for installing authentic post-translational modifications into recombinant proteins. We first used the established O-phosphoserine (Sep) orthogonal translation system to create a Sep-containing recombinant protein. The Sep residue is then dephosphorylated to dehydroalanine (Dha)...
September 29, 2016: Science
A Silvina Nacht, Miguel Beato, Guillermo P Vicent
How genes are repressed by steroid hormones remains a matter of debate and several indirect mechanisms have been proposed. We found that the ligand-activated progesterone receptor (PR) recruits to the promoter of down-regulated genes a repressor complex composed of HP1γ, the lysine demethylase LSD1, histone deacetylases, coREST, the RNA SRA and the ATPase BRG1. BRG1 is needed for chromatin remodeling and facilitates the deposition of linker histone variant H1.2, which compacts chromatin and hinders RNA polymerase loading and transcription...
October 4, 2016: Transcription
Seong-Min Park, Eun-Young Choi, Mingyun Bae, Sunshin Kim, Jong Bae Park, Heon Yoo, Jung Kyoon Choi, Youn-Jae Kim, Seung-Hoon Lee, In-Hoo Kim
Although several somatic single nucleotide variations in histone H3.3 have been investigated as cancer drivers, other types of aberration have not been well studied. Here, we demonstrate that overexpression of H3F3A, encoding H3.3, is associated with lung cancer progression and promotes lung cancer cell migration by activating metastasis-related genes. H3.3 globally activates gene expression through the occupation of intronic regions in lung cancer cells. Moreover, H3.3 binding regions show characteristics of regulatory DNA elements...
October 3, 2016: Nature Communications
Gregory Segala, Marcela A Bennesch, Deo Prakash Pandey, Nicolas Hulo, Didier Picard
Covalent modifications of histones play a crucial role in the regulation of gene expression. Histone H2B monoubiquitination has mainly been described as a regulator of transcription elongation, but its role in transcription initiation is poorly documented. We investigated the role of this histone mark (H2Bub1) on different inducible enhancers, in particular those regulated by estrogen receptor α, by loss- and gain-of-function experiments with the specific E3-ubiquitin ligase complex of H2B: RNF20/RNF40. RNF20/RNF40 overexpression causes repression of the induced activity of these enhancers...
October 20, 2016: Molecular Cell
M Hamza, S Halayem, R Mrad, S Bourgou, F Charfi, A Belhadj
BACKGROUND: The etiology of autism spectrum disorders (ASD) is complex and multifactorial, and the roles of genetic and environmental factors in its emergence have been well documented. Current research tends to indicate that these two factors act in a synergistic manner. The processes underlying this interaction are still poorly known, but epigenetic modifications could be the mediator in the gene/environment interface. The epigenetic mechanisms have been implicated in susceptibility to stress and also in the pathogenesis of psychiatric disorders including depression and schizophrenia...
September 27, 2016: L'Encéphale
Shaorong Zhao, Wei Liu, Yinghui Li, Pengjiang Liu, Shufang Li, Daolei Dou, Yue Wang, Rongcun Yang, Rong Xiang, Feifei Liu
The molecular defects which lead to multistep incidences of human T-cell leukemia have yet to be identified. The DNA-binding protein Helios (known as IKZF2), a member of the Ikaros family of Krüppel-like zinc-finger proteins, functions pivotally in T-cell differentiation and activation. In this study, we identify three novel short Helios splice variants which are T-cell leukemic specific, and demonstrate their dominant-negative function. We then test the cellular localization of distinct Helios isoforms, as well as their capability to form heterodimer with Ikaros, and the association with complexes comprising histone deacetylase (HDAC)...
2016: PloS One
Melanija Posavec Marjanović, Kerryanne Crawford, Ivan Ahel
Compaction mode of chromatin and chromatin highly organised structures regulate gene expression. Posttranslational modifications, histone variants and chromatin remodelers modulate the compaction, structure and therefore function of specific regions of chromatin. The generation of poly(ADP-ribose) (PAR) is emerging as one of the key signalling events on sites undergoing chromatin structure modulation. PAR is generated locally in response to stresses. These include genotoxic stress but also differentiation signals, metabolic and hormonal cues...
September 24, 2016: Seminars in Cell & Developmental Biology
Qianhua Dong, Feng-Xiang Yin, Feng Gao, Yuan Shen, Faben Zhang, Yang Li, Haijin He, Marlyn Gonzalez, Jinpu Yang, Shu Zhang, Min Su, Yu-Hang Chen, Fei Li
CENP-A is a centromere-specific histone 3 variant essential for centromere specification. CENP-A partially replaces canonical histone H3 at the centromeres. How the particular CENP-A/H3 ratio at centromeres is precisely maintained is unknown. It also remains unclear how CENP-A is excluded from non-centromeric chromatin. Here, we identify Ccp1, an uncharacterized NAP family protein in fission yeast that antagonizes CENP-A loading at both centromeric and non-centromeric regions. Like the CENP-A loading factor HJURP, Ccp1 interacts with CENP-A and is recruited to centromeres at the end of mitosis in a Mis16-dependent manner...
October 6, 2016: Molecular Cell
Pim van der Harst, Jessica van Setten, Niek Verweij, Georg Vogler, Lude Franke, Matthew T Maurano, Xinchen Wang, Irene Mateo Leach, Mark Eijgelsheim, Nona Sotoodehnia, Caroline Hayward, Rossella Sorice, Osorio Meirelles, Leo-Pekka Lyytikäinen, Ozren Polašek, Toshiko Tanaka, Dan E Arking, Sheila Ulivi, Stella Trompet, Martina Müller-Nurasyid, Albert V Smith, Marcus Dörr, Kathleen F Kerr, Jared W Magnani, Fabiola Del Greco M, Weihua Zhang, Ilja M Nolte, Claudia T Silva, Sandosh Padmanabhan, Vinicius Tragante, Tõnu Esko, Gonçalo R Abecasis, Michiel E Adriaens, Karl Andersen, Phil Barnett, Joshua C Bis, Rolf Bodmer, Brendan M Buckley, Harry Campbell, Megan V Cannon, Aravinda Chakravarti, Lin Y Chen, Alessandro Delitala, Richard B Devereux, Pieter A Doevendans, Anna F Dominiczak, Luigi Ferrucci, Ian Ford, Christian Gieger, Tamara B Harris, Eric Haugen, Matthias Heinig, Dena G Hernandez, Hans L Hillege, Joel N Hirschhorn, Albert Hofman, Norbert Hubner, Shih-Jen Hwang, Annamaria Iorio, Mika Kähönen, Manolis Kellis, Ivana Kolcic, Ishminder K Kooner, Jaspal S Kooner, Jan A Kors, Edward G Lakatta, Kasper Lage, Lenore J Launer, Daniel Levy, Alicia Lundby, Peter W Macfarlane, Dalit May, Thomas Meitinger, Andres Metspalu, Stefania Nappo, Silvia Naitza, Shane Neph, Alex S Nord, Teresa Nutile, Peter M Okin, Jesper V Olsen, Ben A Oostra, Josef M Penninger, Len A Pennacchio, Tune H Pers, Siegfried Perz, Annette Peters, Yigal M Pinto, Arne Pfeufer, Maria Grazia Pilia, Peter P Pramstaller, Bram P Prins, Olli T Raitakari, Soumya Raychaudhuri, Ken M Rice, Elizabeth J Rossin, Jerome I Rotter, Sebastian Schafer, David Schlessinger, Carsten O Schmidt, Jobanpreet Sehmi, Herman H W Silljé, Gianfranco Sinagra, Moritz F Sinner, Kamil Slowikowski, Elsayed Z Soliman, Timothy D Spector, Wilko Spiering, John A Stamatoyannopoulos, Ronald P Stolk, Konstantin Strauch, Sian-Tsung Tan, Kirill V Tarasov, Bosco Trinh, Andre G Uitterlinden, Malou van den Boogaard, Cornelia M van Duijn, Wiek H van Gilst, Jorma S Viikari, Peter M Visscher, Veronique Vitart, Uwe Völker, Melanie Waldenberger, Christian X Weichenberger, Harm-Jan Westra, Cisca Wijmenga, Bruce H Wolffenbuttel, Jian Yang, Connie R Bezzina, Patricia B Munroe, Harold Snieder, Alan F Wright, Igor Rudan, Laurie A Boyer, Folkert W Asselbergs, Dirk J van Veldhuisen, Bruno H Stricker, Bruce M Psaty, Marina Ciullo, Serena Sanna, Terho Lehtimäki, James F Wilson, Stefania Bandinelli, Alvaro Alonso, Paolo Gasparini, J Wouter Jukema, Stefan Kääb, Vilmundur Gudnason, Stephan B Felix, Susan R Heckbert, Rudolf A de Boer, Christopher Newton-Cheh, Andrew A Hicks, John C Chambers, Yalda Jamshidi, Axel Visel, Vincent M Christoffels, Aaron Isaacs, Nilesh J Samani, Paul I W de Bakker
BACKGROUND: Myocardial mass is a key determinant of cardiac muscle function and hypertrophy. Myocardial depolarization leading to cardiac muscle contraction is reflected by the amplitude and duration of the QRS complex on the electrocardiogram (ECG). Abnormal QRS amplitude or duration reflect changes in myocardial mass and conduction, and are associated with increased risk of heart failure and death. OBJECTIVES: This meta-analysis sought to gain insights into the genetic determinants of myocardial mass...
September 27, 2016: Journal of the American College of Cardiology
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