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Wyszukujesz frazę "chromatin" wg kryterium: Temat


Wyświetlanie 1-14 z 14
Tytuł:
Can chromatin conformation technologies bring light into human molecular pathology?
Autorzy:
Kubiak, Marta
Lewandowska, Marzena
Powiązania:
https://bibliotekanauki.pl/articles/1038988.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
chromosome conformation capture
human molecular pathology
chromatin
chromatin looping
genome organization
Opis:
Regulation of gene expression in eukaryotes involves many complex processes, in which chromatin structure plays an important role. In addition to the epigenetic effects, such as DNA methylation and phosphorylation or histone modifications, gene expression is also controlled by the spatial organization of chromatin. For example, distant regulatory elements (enhancers, insulators) may come into direct physical interaction with target genes or other regulatory elements located in genomic regions of up to several hundred kilobases in size. Such long-range interactions result in the formation of chromatin loops. In the last several years, there has been a rapid increase in our knowledge of the spatial organization of chromatin in the nucleus through the chromosome conformation capture (3C) technology. Here we review and compare the original 3C and 3C-based methods including chromosome conformation capture-on-chip (4C), chromosome conformation capture carbon copy (5C), hi-resolution chromosome confomation capture (HiC). In this article, we discuss different aspects of how the nuclear organization of chromatin is associated with gene expression regulation and how this knowledge is useful in translational medicine and clinical applications. We demonstrate that the knowledge of the chromatin 3D organization may help understand the mechanisms of gene expression regulation of genes involved in the development of human diseases, such as CFTR (responsible for cystic fibrosis) or IGFBP3 (associated with breast cancer pathogenesis). Additionally, 3C-derivative methods have been also useful in the diagnosis of some leukemia subtypes.
Źródło:
Acta Biochimica Polonica; 2015, 62, 3; 483-489
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DNA microarrays, a novel approach in studies of chromatin structure.
Autorzy:
Widłak, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1043314.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
chromatin
genomics
epigenomics
DNA microarray
nucleosomes
Opis:
The DNA microarray technology delivers an experimental tool that allows surveying expression of genetic information on a genome-wide scale at the level of single genes - for the new field termed functional genomics. Gene expression profiling - the primary application of DNA microarrays technology - generates monumental amounts of information concerning the functioning of genes, cells and organisms. However, the expression of genetic information is regulated by a number of factors that cannot be directly targeted by standard gene expression profiling. The genetic material of eukaryotic cells is packed into chromatin which provides the compaction and organization of DNA for replication, repair and recombination processes, and is the major epigenetic factor determining the expression of genetic information. Genomic DNA can be methylated and this modification modulates interactions with proteins which change the functional status of genes. Both chromatin structure and transcriptional activity are affected by the processes of replication, recombination and repair. Modified DNA microarray technology could be applied to genome-wide study of epigenetic factors and processes that modulate the expression of genetic information. Attempts to use DNA microarrays in studies of chromatin packing state, chromatin/DNA-binding protein distribution and DNA methylation pattern on a genome-wide scale are briefly reviewed in this paper.
Źródło:
Acta Biochimica Polonica; 2004, 51, 1; 1-8
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy metals in the cell nucleus - role in pathogenesis
Autorzy:
Sas-Nowosielska, Hanna
Pawlas, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/1039119.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
heavy metal
nucleus
chromatin
DNA
RNA
telomere
Opis:
People are exposed to heavy metals both in an occupational and natural environment. The most pronounced effects of heavy metals result from their interaction with cellular genetic material packed in form of chromatin. Heavy metals influence chromatin, mimicking and substituting natural microelements in various processes taking place in the cell, or interacting chemically with nuclear components: nucleic acids, proteins and lipids. This paper is a review of current knowledge on the effects of heavy metals on chromatin, exerted at the level of various nuclear components.
Źródło:
Acta Biochimica Polonica; 2015, 62, 1; 7-13
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of chromatin condensation state and transcriptional activity using DNA microarrays
Autorzy:
Widłak, P.
Fujarewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/334029.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
mikromacierz DNA
chromatyny
transkrypcja
DNA microarrays
chromatin
transcription
Opis:
The DNA microarray-based technique has been developed to semi-quantitatively measure the in vivo global chromatin condensation state at the resolution of a gene. Chromatin was fractionated due to the differential solubility of histone H1-containing and histone H1-free nucleosomes. A set of genes non-randomly distributed between histone H1-free (uncondensed or open) and histone H1-containing (condensed or closed) chromatin fractions has been identified. The transcript levels have been measured for the same group of genes. The correlation between transcriptional activity and chromatin fraction distribution of particular genes has been established.
Źródło:
Journal of Medical Informatics & Technologies; 2003, 6; IP13-19
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The essential function of Swc4p - a protein shared by two chromatin-modifying complexes of the yeast Saccharomyces cerevisiae - resides within its N-terminal part
Autorzy:
Miciałkiewicz, Arkadiusz
Chełstowska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1040724.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
chromatin remodeling complexes
histone acetylation
mutagenesis
mutant phenotype
Opis:
The Swc4p protein, encoded by an essential gene, is shared by two chromatin-remodeling complexes in Saccharomyces cerevisiae cells: NuA4 (nucleosome acetyltransferase of H4) and SWR1. The SWR1 complex catalyzes ATP-dependent exchange of the nucleosomal histone H2A for H2AZ (Htz1p). The activity of NuA4 is responsible mainly for the acetylation of the H4 histone but also for the acetylation of H2A and H2AZ. In this work we investigated the role of the Swc4p protein. Using random mutagenesis we isolated a collection of swc4 mutants and showed that the essential function of Swc4p resides in its N-terminal part, within the first 269 amino acids of the 476-amino acid-long protein. We also demonstrated that Swc4p is able to accommodate numerous mutations without losing its functionality under standard growth conditions. However, when swc4 mutants were exposed to methyl methanesulfonate (MMS), hydroxyurea or benomyl, severe growth deficiencies appeared, pointing to an involvement of Swc4p in many chromatin-based processes. The mutants' phenotypes did not result from an impairment of histone acetylation, as in the mutant which bears the shortest isolated variant of truncated Swc4p, the level of overall H4 acetylation was unchanged.
Źródło:
Acta Biochimica Polonica; 2008, 55, 3; 603-612
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The HPV16 E2 transcriptional regulator mode of action depends on the physical state of the viral genome
Autorzy:
Schmidt, Marcin
Olejnik, Agnieszka
Goździcka-Józefiak, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1041324.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
E2
chromatin
transcription
HPV
retinol
steroid hormones
LCR
Opis:
Human papillomavirus (HPV) infection is a major risk factor for the development of cervical cancer. The HPV-induced immortalization of epithelial cell usually requires integration of the viral DNA into the host cell genome. The integration event causes disruption of the E2 gene and this is followed by overexpression of the E6 and E7 oncoproteins. The E2 protein is a transcription factor that regulates expression of the E6 and E7 oncoproteins by binding to four sites within the viral long control region. We used an in vitro cell culture model to explore the role of the E2 protein in the transcriptional control of the HPV16 long control region. Employing transient and stable transfection experiments we simulated the episomal and integrated states of the viral genome, respectively. We show that the E2 protein up-regulates E6/E7 transcription from episomal DNA but represses it in the case of integrated DNA. The activator function of the E2 protein seems to counteract the repressive chromatin structure formed over episomal DNA. Steroid hormones and retinol also modulate oncogene transcription differently depending on the physical structure of the viral DNA. Our data suggest regulatory mechanisms involving interactions between the E2 protein and nuclear hormone receptors.
Źródło:
Acta Biochimica Polonica; 2005, 52, 4; 823-832
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Direct interaction of Gas41 and Myc encoded by amplified genes in nervous system tumours
Autorzy:
Piccinni, Eugenia
Chelstowska, Anna
Hanus, Jakub
Widlak, Piotr
Loreti, Simona
Tata, Ada
Augusti-Tocco, Gabriella
Bianchi, Michele
Negri, Rodolfo
Powiązania:
https://bibliotekanauki.pl/articles/1039845.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
transcription regulation
Gas41
n-Myc
brain tumours
chromatin modification
Opis:
In order to understand better the role of the human Tip60 complex component Gas41, we analysed its expression levels in brain tumours and searched for possible interactors. Two-hybrid screening of a human foetal brain library allowed identification of some molecular interactors of Gas41. Among them we found n-Myc transcription factor. The interaction between Gas41 and n-Myc was validated by pull-down experiments. We showed that Gas41 is able to bind both n-Myc and c-Myc proteins, and that the levels of expression of Gas41 and Myc proteins were similar to each other in such brain tumors as neuroblastomas and glioblastomas. Finally, in order to identify which region of Gas41 is involved in the interaction with Myc proteins, we analysed the ability of Gas41 to substitute for its orthologue Yaf9 in yeast; we showed that the N-terminal portions of the two proteins, containing the YEATS domains, are interchangeable, while the C-terminal portions are species-specific. In fact we found that Gas41 C-terminal portion is required for Myc protein interaction in human.
Źródło:
Acta Biochimica Polonica; 2011, 58, 4; 529-534
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High mobility group proteins stimulate DNA cleavage by apoptotic endonuclease DFF40/CAD due to HMG-box interactions with DNA
Autorzy:
Kalinowska-Herok, Magdalena
Widłak, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1040769.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
CAD
cisplatin
HMGB1 protein
chromatin
nuclease
HMG-box
DFF
Opis:
The DFF40/CAD endonuclease is primarily responsible for internucleosomal DNA cleavage during the terminal stages of apoptosis. It has been previously demonstrated that the major HMG-box-containing chromatin proteins HMGB1 and HMGB2 stimulate naked DNA cleavage by DFF40/CAD. Here we investigate the mechanism of this stimulation and show that HMGB1 neither binds to DFF40/CAD nor enhances its ability for stable binding to DNA. Comparison of the stimulatory activities of different truncated forms of HMGB1 protein indicates that a structural array of two HMG-boxes is required for such stimulation. HMG-boxes are known to confer specific local distortions of DNA structure upon binding. Interestingly, the presence of DNA strand cross-links formed by cisplatin or transplatin, which may somehow mimic distortions induced by HMG-boxes, also affects DNA cleavage by the nuclease. The data presented suggest that changes induced in DNA conformation upon HMG-box binding makes the substrate more accessible to cleavage by DFF40/CAD nuclease and thus may contribute to preferential linker DNA cleavage during apoptosis.
Źródło:
Acta Biochimica Polonica; 2008, 55, 1; 21-26
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chromatin immunoprecipitation — new approach for revealing histone modifications in plants under heavy metal stress — theoretical review on advantages, drawbacks and questions
Autorzy:
Kwaśniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/115479.pdf
Data publikacji:
2010
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
chromatin dynamics
heavy metal stress
ecophysiology
ChIP
immunoprecipitation
histone modifications
epigenetic
Opis:
Heavy metal contamination is a major environmental problem. A coordinated network of molecular processes participates in plant response to heavy metals. The metal-dependent gene expression is regulated on multiple levels and may include chromatin modifi cations. One of the methods which allows to understand the role of histone post-translational modifi cations in plant cell response to heavy metals may be chromatin immunoprecipitation.
Źródło:
Challenges of Modern Technology; 2010, 1, 1; 7-10
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear morphology, polyploidy, and chromatin elimination in tissue culture of Allium fistulosum L.
Autorzy:
Joachimiak, A
Ilnicki, T.
Powiązania:
https://bibliotekanauki.pl/articles/59216.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
chromatin
heterochromatin
tissue culture
polyploidy
Alliaceae
morphology
Monocotyledoneae
micronucleus
Allium fistulosum
Opis:
The morphology of cell nuclei in callus obtained from root-tip meristems of Allium fistulosum L. (Monocotyledoneae, Alliaceae) was analysed. The most interesting phenomena observed in long-term callus culture were the different mechanisms of cell polyploidization, enlargement of telomeric segments of heterochromatin, and extensive chromatin elimination, associated with instability of nuclei size and DNA content. Protruding heterochromatin "spikes" were observed on the surface of some di- and polyploid nuclei. The presence of these spikes was connected with the formation of small heterochromatic micronuclei frequently found in the cytoplasm. It is suggested that these micronuclei are produced by direct elimination of heterochromatin from the interphase nuclei. Polyploid cells accumulated with each successive cell collection. The ploidy level attained by highly polyploid cells was 15C-220C. The shape of the nuclei and heterochromatin distribution suggest that polyploid nuclei in A. fistulosum tissue culture are produced by endoreduplication and by restitution cycles.
Źródło:
Acta Societatis Botanicorum Poloniae; 2003, 72, 1
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in DNA methylation in maize under herbicide stress conditions
Autorzy:
Tyczewska, A.
Gracz, J.
Szymkowiak, J.
Twardowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/951318.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DNA methylation
chromatin modification
gene silencing
gene transcription
maize
herbicide stress
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 1
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intrinsic and extrinsic molecular determinants or modulators for epigenetic remodeling and reprogramming of somatic cell-derived genome in mammalian nuclear-transferred oocytes and resultant embryos
Autorzy:
Samiec, M.
Skrzyszowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2087775.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
somatic cell nucleus
reconstructed oocyte
epigenomic maturity
nuclear-transferred embryo
somatic cell-inherited chromatin remodeling
donor nuclear reprogramming
epigenetic modulator/modifier
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 1; 217-227
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chromatin acetylation, β-amyloid precursor protein and its binding partner FE65 in DNA double strand break repair
Autorzy:
Szumiel, Irena
Foray, Nicolas
Powiązania:
https://bibliotekanauki.pl/articles/1039940.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
chromatin acetylation
FE65
MOF acetyltransferase
DNA double strand break repair
β-amyloid precursor protein
Tip60 histone acetyltransferase
heterochromatin protein 1
Opis:
Among post-translational modifications of chromatin proteins taking place in DNA double strand break (DSB) repair, acetylation plays a prominent role. This review lists several facts and hypotheses concerning this process. Lack of acetyltransferase TIP60 (HIV-Tat interacting protein of 60 kDa) activity results in cells with defective DSB repair. The enzyme is present in the nucleus in a multimeric protein complex. TIP60 dependent activation of ATM (ataxia telangiectasia mutated kinase) is an early event in the response to DNA breakage. Other important acetylations are those of histones H4 and γH2AX. Correct reconstruction of the damaged site is critical for survival and prevention of genetic and epigenetic changes in the cell that may affect the function of its daughter cells. Recently, two proteins with previously unsuspected functions in DSB repair have been identified as active in this process: Alzheimer β-amyloid precursor protein (APP) and its binding partner FE65, β-amyloid precursor binding protein. Their participation in DSB repair in both neuronal and non-neuronal cells is related to acetylation carried out by the acetyltransferase complex. The same function is ascribed to heterochromatin protein 1 (HP1). So far, the relations (if any) between TIP60 activation by HP1 and by the FE65 complex remain unidentified.
Źródło:
Acta Biochimica Polonica; 2011, 58, 1; 11-18
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in distribution of 5 methylcytosine in male and female gametophyte of Hyacinthus orientalis before and after fertilization
Autorzy:
Kozlowska, M.
Niedojadlo, K.
Bednarska-Kozakiewicz, E.
Powiązania:
https://bibliotekanauki.pl/articles/80166.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
gene activity
chromatin structure
5-methylcytosine
female gametophyte
male gametophyte
seed development
flowering plant
Hyacinthus orientalis
fertilization
transcriptional activity
epigenetic factor
DNA methylation
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-14 z 14

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