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BRG1/BRM

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https://www.readbyqxmd.com/read/28193841/dual-roles-of-akirin2-during-xenopus-neural-development
#1
Xiaoliang Liu, Yingjie Xia, Jixin Tang, Li Ma, Chaocui Li, Pengcheng Ma, Bingyu Mao
To ensure correct spatial and temporal patterning, embryos must maintain pluripotent cell populations and control when cells undergo commitment. The newly identified nucleoprotein Akirin has been shown to modulate the innate immune response through epigenetic regulation and to play important roles in other physiological processes, but its role in neural development remains unknown. Here, we show that Akirin2 is required for neural development in Xenopus and knockdown of Akirin2 expands the expression of the neural progenitor marker Sox2 and inhibits expression of the differentiated neuronal marker N-tubulin...
February 13, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28038711/smarca4-and-smarca2-deficiency-in-non-small-cell-lung-cancer-immunohistochemical-survey-of-316-consecutive-specimens
#2
Esther Herpel, Ralf J Rieker, Hendrik Dienemann, Thomas Muley, Michael Meister, Arndt Hartmann, Arne Warth, Abbas Agaimy
The chromatin remodeling switch sucrose nonfermentable (SWI/SNF) complex has been increasingly implicated in the pathogenesis and dedifferentiation of neoplasms from several organs with prognostic and potential therapeutic implications. We herein investigated the expression of the SWI/SNF complex catalytic subunits SMARCA4 (BRG1) and SMARCA2 (BRM) in 316 consecutive non-small cell lung cancer (NSCLC) specimens on tissue microarrays (171 adenocarcinomas [ADCAs], 130 squamous cell carcinomas [SCCs], 9 adenosquamous carcinomas, and 6 large cell carcinomas) excluding undifferentiated/giant cell or rhabdoid carcinomas...
February 2017: Annals of Diagnostic Pathology
https://www.readbyqxmd.com/read/27905400/lncbrm-initiates-yap1-signalling-activation-to-drive-self-renewal-of-liver-cancer-stem-cells
#3
Pingping Zhu, Yanying Wang, Jiayi Wu, Guanling Huang, Benyu Liu, Buqing Ye, Ying Du, Guangxia Gao, Yong Tian, Lei He, Zusen Fan
Liver cancer stem cells (CSCs) may contribute to the high rate of recurrence and heterogeneity of hepatocellular carcinoma (HCC). However, the biology of hepatic CSCs remains largely undefined. Through analysis of transcriptome microarray data, we identify a long noncoding RNA (lncRNA) called lncBRM, which is highly expressed in liver CSCs and HCC tumours. LncBRM is required for the self-renewal maintenance of liver CSCs and tumour initiation. In liver CSCs, lncBRM associates with BRM to initiate the BRG1/BRM switch and the BRG1-embedded BAF complex triggers activation of YAP1 signalling...
December 1, 2016: Nature Communications
https://www.readbyqxmd.com/read/27764136/immunohistochemistry-successfully-uncovers-intratumoral-heterogeneity-and-widespread-co-losses-of-chromatin-regulators-in-clear-cell-renal-cell-carcinoma
#4
Wei Jiang, Essel Dulaimi, Karthik Devarajan, Theodore Parsons, Qiong Wang, Lili Liao, Eun-Ah Cho, Raymond O'Neill, Charalambos Solomides, Stephen C Peiper, Joseph R Testa, Robert Uzzo, Haifeng Yang
Recent studies have shown that intratumoral heterogeneity (ITH) is prevalent in clear cell renal cell carcinoma (ccRCC), based on DNA sequencing and chromosome aberration analysis of multiple regions from the same tumor. VHL mutations were found to be universal throughout individual tumors when it occurred (ubiquitous), while the mutations in other tumor suppressor genes tended to be detected only in parts of the tumors (subclonal). ITH has been studied mostly by DNA sequencing in limited numbers of samples, either by whole genome sequencing or by targeted sequencing...
2016: PloS One
https://www.readbyqxmd.com/read/27588112/h4k5-histone-acetylation-of-brg1-is-associated-with-heroin-administration-rather-than-addiction
#5
Limin Xu, Qingxiao Hong, Xiaoying Chen, Xuting Xu, Huifen Liu, Wenhua Zhou, Shiwei Duan
Diacetylmorphine hydrochloride (heroin) addiction is a chronic relapsing brain disorder that is a heavy public health burden worldwide. Brm/SWI2-related gene-1 (BRG1) is a tumor suppressor gene that can influence embryogenesis and the development of the cerebellum. The current study aimed to investigate the effect of histone H4 lysine 5 (H4K5) modifications on the BRG1 gene in brain tissue of the ventral tegmental area (VTA) of heroin-addicted rats. A total of 21 male Sprague Dawley rats were raised in a standard manner and underwent heroin self-administration training...
September 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/27188282/epigenetically-maintained-sw13-and-sw13-subtypes-have-different-oncogenic-potential-and-convert-with-hdac1-inhibition
#6
McKale R Davis, Juliane J Daggett, Agnes S Pascual, Jessica M Lam, Kathryn J Leyva, Kimbal E Cooper, Elizabeth E Hull
BACKGROUND: The BRM and BRG1 tumor suppressor genes are mutually exclusive ATPase subunits of the SWI/SNF chromatin remodeling complex. The human adrenal carcinoma SW13 cell line can switch between a subtype which expresses these subunits, SW13+, and one that expresses neither subunit, SW13-. Loss of BRM expression occurs post-transcriptionally and can be restored via histone deacetylase (HDAC) inhibition. However, most previously used HDAC inhibitors are toxic and broad-spectrum, providing little insight into the mechanism of the switch between subtypes...
2016: BMC Cancer
https://www.readbyqxmd.com/read/27125315/expression-analysis-of-baf60c-during-heart-regeneration-in-axolotls-and-neonatal-mice
#7
Ryo Nakamura, Kazuko Koshiba-Takeuchi, Megumi Tsuchiya, Mizuyo Kojima, Asuka Miyazawa, Kohei Ito, Hidesato Ogawa, Jun K Takeuchi
Some organisms, such as zebrafish, urodele amphibians, and newborn mice, have a capacity for heart regeneration following injury. However, adult mammals fail to regenerate their hearts. To know why newborn mice can regenerate their hearts, we focused on epigenetic factors, which are involved in cell differentiation in many tissues. Baf60c (BRG1/BRM-associated factor 60c), a component of ATP-dependent chromatin-remodeling complexes, has an essential role for cardiomyocyte differentiation at the early heart development...
May 2016: Development, Growth & Differentiation
https://www.readbyqxmd.com/read/27100670/pbrm1-regulates-the-expression-of-genes-involved-in-metabolism-and-cell-adhesion-in-renal-clear-cell-carcinoma
#8
Basudev Chowdhury, Elizabeth G Porter, Jane C Stewart, Christina R Ferreira, Matthew J Schipma, Emily C Dykhuizen
Polybromo-1 (PBRM1) is a component of the PBAF (Polybromo-associated-BRG1- or BRM-associated factors) chromatin remodeling complex and is the second most frequently mutated gene in clear-cell renal cell Carcinoma (ccRCC). Mutation of PBRM1 is believed to be an early event in carcinogenesis, however its function as a tumor suppressor is not understood. In this study, we have employed Next Generation Sequencing to profile the differentially expressed genes upon PBRM1 re-expression in a cellular model of ccRCC...
2016: PloS One
https://www.readbyqxmd.com/read/27039070/brg1-and-brm-swi-snf-atpases-redundantly-maintain-cardiomyocyte-homeostasis-by-regulating-cardiomyocyte-mitophagy-and-mitochondrial-dynamics-in-vivo
#9
Scott J Bultman, Darcy Wood Holley, Gustaaf G de Ridder, Salvatore V Pizzo, Tatiana N Sidorova, Katherine T Murray, Brian C Jensen, Zhongjing Wang, Ariana Bevilacqua, Xin Chen, Megan T Quintana, Manasi Tannu, Gary B Rosson, Kumar Pandya, Monte S Willis
There has been an increasing recognition that mitochondrial perturbations play a central role in human heart failure. Mitochondrial networks, whose function is to maintain the regulation of mitochondrial biogenesis, autophagy ('mitophagy') and mitochondrial fusion/fission, are new potential therapeutic targets. Yet our understanding of the molecular underpinning of these processes is just emerging. We recently identified a role of the SWI/SNF ATP-dependent chromatin remodeling complexes in the metabolic homeostasis of the adult cardiomyocyte using cardiomyocyte-specific and inducible deletion of the SWI/SNF ATPases BRG1 and BRM in adult mice (Brg1/Brm double mutant mice)...
May 2016: Cardiovascular Pathology: the Official Journal of the Society for Cardiovascular Pathology
https://www.readbyqxmd.com/read/26702435/selective-targeting-of-the-brg-pb1-bromodomains-impairs-embryonic-and-trophoblast-stem-cell-maintenance
#10
Oleg Fedorov, Josefina Castex, Cynthia Tallant, Dafydd R Owen, Sarah Martin, Matteo Aldeghi, Octovia Monteiro, Panagis Filippakopoulos, Sarah Picaud, John D Trzupek, Brian S Gerstenberger, Chas Bountra, Dominica Willmann, Christopher Wells, Martin Philpott, Catherine Rogers, Philip C Biggin, Paul E Brennan, Mark E Bunnage, Roland Schüle, Thomas Günther, Stefan Knapp, Susanne Müller
Mammalian SWI/SNF [also called Brg/Brahma-associated factors (BAFs)] are evolutionarily conserved chromatin-remodeling complexes regulating gene transcription programs during development and stem cell differentiation. BAF complexes contain an ATP (adenosine 5'-triphosphate)-driven remodeling enzyme (either BRG1 or BRM) and multiple protein interaction domains including bromodomains, an evolutionary conserved acetyl lysine-dependent protein interaction motif that recruits transcriptional regulators to acetylated chromatin...
November 2015: Science Advances
https://www.readbyqxmd.com/read/26356327/dual-loss-of-the-swi-snf-complex-atpases-smarca4-brg1-and-smarca2-brm-is-highly-sensitive-and-specific-for-small-cell-carcinoma-of-the-ovary-hypercalcaemic-type
#11
Anthony N Karnezis, Yemin Wang, Pilar Ramos, William Pd Hendricks, Esther Oliva, Emanuela D'Angelo, Jaime Prat, Marisa R Nucci, Torsten O Nielsen, Christine Chow, Samuel Leung, Friedrich Kommoss, Stefan Kommoss, Annacarolina Silva, Brigitte M Ronnett, Joseph T Rabban, David D Bowtell, Bernard E Weissman, Jeffrey M Trent, C Blake Gilks, David G Huntsman
Small cell carcinoma of the ovary, hypercalcaemic type (SCCOHT) is a lethal and sometimes familial ovarian tumour of young women and children. We and others recently discovered that over 90% of SCCOHTs harbour inactivating mutations in the chromatin remodelling gene SMARCA4 with concomitant loss of its encoded protein SMARCA4 (BRG1), one of two mutually exclusive ATPases of the SWI/SNF chromatin remodelling complex. To determine the specificity of SMARCA4 loss for SCCOHT, we examined the expression of SMARCA4 by immunohistochemistry in more than 3000 primary gynaecological tumours...
February 2016: Journal of Pathology
https://www.readbyqxmd.com/read/26345631/frequent-loss-of-the-expression-of-multiple-subunits-of-the-swi-snf-complex-in-large-cell-carcinoma-and-pleomorphic-carcinoma-of-the-lung
#12
Taichiro Yoshimoto, Daisuke Matsubara, Tomoyuki Nakano, Tomoko Tamura, Shunsuke Endo, Yukihiko Sugiyama, Toshiro Niki
The switch/sucrose non-fermenting (SWI/SNF) complex has recently emerged as a novel tumor suppressor in various human cancers. In the present study, we analyzed the expression of multiple SWI/SNF subunits in primary non-small cell lung cancer (NSCLC). A total of 133 NSCLC, consisting of 25 squamous cell carcinomas (SCC), 70 adenocarcinomas (AD), 16 large cell carcinomas (LC), and 22 pleomorphic carcinomas (PL), were immunohistochemically examined for the expression of BRG1, BRM, BAF47, ARID1A, and ARID1B. The frequency at which reductions in the expression of BRG1 were observed was significantly higher in the LC-PL group (13/38, 34...
November 2015: Pathology International
https://www.readbyqxmd.com/read/26136374/brahma-is-required-for-cell-cycle-arrest-and-late-muscle-gene-expression-during-skeletal-myogenesis
#13
Sonia Albini, Paula Coutinho Toto, Alessandra Dall'Agnese, Barbora Malecova, Carlo Cenciarelli, Armando Felsani, Maurizia Caruso, Scott J Bultman, Pier Lorenzo Puri
Although the two catalytic subunits of the SWI/SNF chromatin-remodeling complex--Brahma (Brm) and Brg1--are almost invariably co-expressed, their mutually exclusive incorporation into distinct SWI/SNF complexes predicts that Brg1- and Brm-based SWI/SNF complexes execute specific functions. Here, we show that Brg1 and Brm have distinct functions at discrete stages of muscle differentiation. While Brg1 is required for the activation of muscle gene transcription at early stages of differentiation, Brm is required for Ccnd1 repression and cell cycle arrest prior to the activation of muscle genes...
August 2015: EMBO Reports
https://www.readbyqxmd.com/read/26121422/knockdown-of-brm-and-baf170-components-of-chromatin-remodeling-complex-facilitates-reprogramming-of-somatic-cells
#14
Zongliang Jiang, Yong Tang, Xueming Zhao, Mingyuan Zhang, David M Donovan, Xiuchun Cindy Tian
The SWI/SNF (SWItch/Sucrose NonFermentable or BAF, Brg/Brahma-associated factors) complexes are epigenetic modifiers of chromatin structure and undergo progressive changes in subunit composition during cellular differentiation. For example, in embryonic stem cells, esBAF contains Brg1 and Baf155, while their homologs, Brm and Baf170, are present in BAF of somatic cells. In this study, we sought to determine whether Brm and Baf170 play any roles in induced pluripotent stem cell (iPSC) reprogramming by using shRNA-mediated knockdown studies in the mouse model...
October 1, 2015: Stem Cells and Development
https://www.readbyqxmd.com/read/26097869/induction-of-functional-brm-protein-from-brm-knockout-mice
#15
Kenneth W Thompson, Stefanie B Marquez, Li Lu, David Reisman
Once the knockout of the Brm gene was found to be nontumorigenic in mice, the study of BRM's involvement in cancer seemed less important compared with that of its homolog, Brg1. This has likely contributed to the disparity that has been observed in the publication ratio between BRG1 and BRM. We show that a previously published Brm knockout mouse is an incomplete knockout whereby a truncated isoform of Brm is detected in normal tissue and in tumors. We show that this truncated Brm isoform has functionality comparable to wild type Brm...
2015: Oncoscience
https://www.readbyqxmd.com/read/25904594/swi-snf-chromatin-remodeling-enzymes-brahma-related-gene-1-brg1-and-brahma-brm-are-dispensable-in-multiple-models-of-postnatal-angiogenesis-but-are-required-for-vascular-integrity-in-infant-mice
#16
Mandi M Wiley, Vijay Muthukumar, Timothy M Griffin, Courtney T Griffin
BACKGROUND: Mammalian SWItch/Sucrose NonFermentable (SWI/SNF) adenosine triphosphate (ATP)-dependent chromatin-remodeling complexes play important roles in embryonic vascular development by modulating transcription of specific target genes. We sought to determine whether SWI/SNF complexes likewise impact postnatal physiological and pathological angiogenesis. METHODS AND RESULTS: Brahma-related gene 1 (BRG1) and Brahma gene (BRM) are ATPases within mammalian SWI/SNF complexes and are essential for the complexes to function...
April 2015: Journal of the American Heart Association
https://www.readbyqxmd.com/read/25894978/the-chromatin-remodeler-chd8-is-required-for-activation-of-progesterone-receptor-dependent-enhancers
#17
María Ceballos-Chávez, Alicia Subtil-Rodríguez, Eugenia G Giannopoulou, Daniel Soronellas, Elena Vázquez-Chávez, Guillermo P Vicent, Olivier Elemento, Miguel Beato, José C Reyes
While the importance of gene enhancers in transcriptional regulation is well established, the mechanisms and the protein factors that determine enhancers activity have only recently begun to be unravelled. Recent studies have shown that progesterone receptor (PR) binds regions that display typical features of gene enhancers. Here, we show by ChIP-seq experiments that the chromatin remodeler CHD8 mostly binds promoters under proliferation conditions. However, upon progestin stimulation, CHD8 re-localizes to PR enhancers also enriched in p300 and H3K4me1...
April 2015: PLoS Genetics
https://www.readbyqxmd.com/read/25808524/the-swi-snf-atpases-are-required-for-triple-negative-breast-cancer-cell-proliferation
#18
Qiong Wu, Pasil Madany, Jacqueline Akech, Jason R Dobson, Stephen Douthwright, Gillian Browne, Jennifer L Colby, Georg E Winter, James E Bradner, Jitesh Pratap, Greenfield Sluder, Rohit Bhargava, Simion I Chiosea, Andre J van Wijnen, Janet L Stein, Gary S Stein, Jane B Lian, Jeffrey A Nickerson, Anthony N Imbalzano
The Brahma (BRM) and Brahma-related Gene 1 (BRG1) ATPases are highly conserved homologs that catalyze the chromatin remodeling functions of the multi-subunit human SWI/SNF chromatin remodeling enzymes in a mutually exclusive manner. SWI/SNF enzyme subunits are mutated or missing in many cancer types, but are overexpressed without apparent mutation in other cancers. Here, we report that both BRG1 and BRM are overexpressed in most primary breast cancers independent of the tumor's receptor status. Knockdown of either ATPase in a triple negative breast cancer cell line reduced tumor formation in vivo and cell proliferation in vitro...
November 2015: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/25801033/dynamic-recruitment-of-functionally-distinct-swi-snf-chromatin-remodeling-complexes-modulates-pdx1-activity-in-islet-%C3%AE-cells
#19
Brian McKenna, Min Guo, Albert Reynolds, Manami Hara, Roland Stein
Pdx1 is a transcription factor of fundamental importance to pancreas formation and adult islet β cell function. However, little is known about the positive- and negative-acting coregulators recruited to mediate transcriptional control. Here, we isolated numerous Pdx1-interacting factors possessing a wide range of cellular functions linked with this protein, including, but not limited to, coregulators associated with transcriptional activation and repression, DNA damage response, and DNA replication. Because chromatin remodeling activities are essential to developmental lineage decisions and adult cell function, our analysis focused on investigating the influence of the Swi/Snf chromatin remodeler on Pdx1 action...
March 31, 2015: Cell Reports
https://www.readbyqxmd.com/read/25774356/beyond-mutations-additional-mechanisms-and-implications-of-swi-snf-complex-inactivation
#20
REVIEW
Stefanie B Marquez, Kenneth W Thompson, Li Lu, David Reisman
UNLABELLED: SWI/SNF is a major regulator of gene expression. Its role is to facilitate the shifting and exposure of DNA segments within the promoter and other key domains to transcription factors and other essential cellular proteins. This complex interacts with a wide range of proteins and does not function within a single, specific pathway; thus, it is involved in a multitude of cellular processes, including DNA repair, differentiation, development, cell adhesion, and growth control...
2014: Frontiers in Oncology
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