BACKGROUND: DYT6 dystonia belongs to a group of isolated, genetically determined, generalized dystonia associated with mutations in the THAP1 gene. CASE PRESENTATION: We present the case of a young patient with DYT6 dystonia associated with a newly discovered c14G>A (p.Cys5Tyr) mutation in the THAP1 gene. We describe the clinical phenotype of this new mutation, effect of pallidal deep brain stimulation (DBS), which was accompanied by two rare postimplantation complications: an early intracerebral hemorrhage and delayed epileptic seizures. Among the published case reports of patients with DYT6 dystonia, the mentioned complications have not been described so far. CONCLUSIONS: DBS in the case of DYT6 dystonia is a challenge to thoroughly consider possible therapeutic benefits and potential risks associated with surgery. Genetic heterogeneity of the disease may also play an important role in predicting the development of the clinical phenotype as well as the effect of treatment including DBS. Therefore, it is beneficial to analyze the genetic and clinical relationships of DYT6 dystonia.
- MeSH
- DNA vazebné proteiny genetika MeSH
- dystonické poruchy * genetika terapie MeSH
- dystonie * genetika terapie MeSH
- hluboká mozková stimulace * škodlivé účinky MeSH
- jaderné proteiny genetika MeSH
- lidé MeSH
- proteiny regulující apoptózu genetika MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- kazuistiky MeSH
P53, P63, and P73 proteins belong to the P53 family of transcription factors, sharing a common gene organization that, from the P1 and P2 promoters, produces two groups of mRNAs encoding proteins with different N-terminal regions; moreover, alternative splicing events at C-terminus further contribute to the generation of multiple isoforms. P53 family proteins can influence a plethora of cellular pathways mainly through the direct binding to specific DNA sequences known as response elements (REs), and the transactivation of the corresponding target genes. However, the transcriptional activation by P53 family members can be regulated at multiple levels, including the DNA topology at responsive promoters. Here, by using a yeast-based functional assay, we evaluated the influence that a G-quadruplex (G4) prone sequence adjacent to the p53 RE derived from the apoptotic PUMA target gene can exert on the transactivation potential of full-length and N-terminal truncated P53 family α isoforms (wild-type and mutant). Our results show that the presence of a G4 prone sequence upstream or downstream of the P53 RE leads to significant changes in the relative activity of P53 family proteins, emphasizing the potential role of structural DNA features as modifiers of P53 family functions at target promoter sites.
- MeSH
- apoptóza genetika MeSH
- DNA genetika ultrastruktura MeSH
- G-kvadruplexy * MeSH
- konformace nukleové kyseliny MeSH
- lidé MeSH
- membránové proteiny genetika ultrastruktura MeSH
- nádorový supresorový protein p53 genetika ultrastruktura MeSH
- promotorové oblasti (genetika) genetika MeSH
- protein p73 genetika ultrastruktura MeSH
- proteiny regulující apoptózu genetika MeSH
- protoonkogenní proteiny genetika MeSH
- responzivní elementy genetika MeSH
- Saccharomyces cerevisiae genetika MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
A promising therapeutic strategy for amyotrophic lateral sclerosis (ALS) treatment is stem cell therapy. Neural progenitors derived from induced pluripotent cells (NP-iPS) might rescue or replace dying motoneurons (MNs). However, the mechanisms responsible for the beneficial effect are not fully understood. The aim here was to investigate the mechanism by studying the effect of intraspinally injected NP-iPS into asymptomatic and early symptomatic superoxide dismutase (SOD)1G93A transgenic rats. Prior to transplantation, NP-iPS were characterized in vitro for their ability to differentiate into a neuronal phenotype. Motor functions were tested in all animals, and the tissue was analyzed by immunohistochemistry, qPCR, and Western blot. NP-iPS transplantation significantly preserved MNs, slowed disease progression, and extended the survival of all treated animals. The dysregulation of spinal chondroitin sulfate proteoglycans was observed in SOD1G93A rats at the terminal stage. NP-iPS application led to normalized host genes expression (versican, has-1, tenascin-R, ngf, igf-1, bdnf, bax, bcl-2, and casp-3) and the protection of perineuronal nets around the preserved MNs. In the host spinal cord, transplanted cells remained as progenitors, many in contact with MNs, but they did not differentiate. The findings suggest that NP-iPS demonstrate neuroprotective properties by regulating local gene expression and regulate plasticity by modulating the central nervous system (CNS) extracellular matrix such as perineuronal nets (PNNs).
- MeSH
- amyotrofická laterální skleróza terapie MeSH
- indukované pluripotentní kmenové buňky cytologie MeSH
- krysa rodu rattus MeSH
- kultivované buňky MeSH
- lidé MeSH
- nervové kmenové buňky cytologie metabolismus transplantace MeSH
- neuroplasticita * MeSH
- neurotrofní faktory genetika metabolismus MeSH
- periferní nervy fyziologie MeSH
- potkani Sprague-Dawley MeSH
- proteiny regulující apoptózu genetika metabolismus MeSH
- regenerace nervu MeSH
- tenascin genetika metabolismus MeSH
- transplantace kmenových buněk metody MeSH
- versikany genetika metabolismus MeSH
- zvířata MeSH
- Check Tag
- krysa rodu rattus MeSH
- lidé MeSH
- mužské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
BACKGROUND: One of the most unusual sources of phylogenetically restricted genes is the molecular domestication of transposable elements into a host genome as functional genes. Although these kinds of events are sometimes at the core of key macroevolutionary changes, their origin and organismal function are generally poorly understood. RESULTS: Here, we identify several previously unreported transposable element domestication events in the human and mouse genomes. Among them, we find a remarkable molecular domestication that gave rise to a multigenic family in placental mammals, the Bex/Tceal gene cluster. These genes, which act as hub proteins within diverse signaling pathways, have been associated with neurological features of human patients carrying genomic microdeletions in chromosome X. The Bex/Tceal genes display neural-enriched patterns and are differentially expressed in human neurological disorders, such as autism and schizophrenia. Two different murine alleles of the cluster member Bex3 display morphological and physiopathological brain modifications, such as reduced interneuron number and hippocampal electrophysiological imbalance, alterations that translate into distinct behavioral phenotypes. CONCLUSIONS: We provide an in-depth understanding of the emergence of a gene cluster that originated by transposon domestication and gene duplication at the origin of placental mammals, an evolutionary process that transformed a non-functional transposon sequence into novel components of the eutherian genome. These genes were integrated into existing signaling pathways involved in the development, maintenance, and function of the CNS in eutherians. At least one of its members, Bex3, is relevant for higher brain functions in placental mammals and may be involved in human neurological disorders.
- MeSH
- CRISPR-Cas systémy MeSH
- DNA vazebné proteiny genetika MeSH
- domestikace * MeSH
- fylogeneze MeSH
- jaderné proteiny genetika MeSH
- lidé MeSH
- molekulární evoluce MeSH
- mozek MeSH
- multigenová rodina * MeSH
- myši inbrední C57BL MeSH
- myši knockoutované MeSH
- myši MeSH
- neurovývojové poruchy genetika MeSH
- placenta MeSH
- placentálové genetika MeSH
- poruchy autistického spektra genetika MeSH
- proteiny nervové tkáně genetika MeSH
- proteiny regulující apoptózu genetika MeSH
- těhotenství MeSH
- TOR serin-threoninkinasy genetika MeSH
- transkripční faktory genetika MeSH
- transpozibilní elementy DNA * MeSH
- zvířata MeSH
- Check Tag
- lidé MeSH
- myši MeSH
- těhotenství MeSH
- ženské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Replication-dependent histones (RDH) are required for packaging of newly synthetized DNA into nucleosomes during the S phase when their expression is highly upregulated. However, the mechanisms of this upregulation in metazoan cells remain poorly understood. Using iCLIP and ChIP-seq, we found that human cyclin-dependent kinase 11 (CDK11) associates with RNA and chromatin of RDH genes primarily in the S phase. Moreover, its amino-terminal region binds FLASH, an RDH-specific 3'-end processing factor, which keeps the kinase on the chromatin. CDK11 phosphorylates serine 2 (Ser2) of the carboxy-terminal domain of RNA polymerase II (RNAPII), which is initiated when RNAPII reaches the middle of RDH genes and is required for further RNAPII elongation and 3'-end processing. CDK11 depletion leads to decreased number of cells in S phase, likely owing to the function of CDK11 in RDH gene expression. Thus, the reliance of RDH expression on CDK11 could explain why CDK11 is essential for the growth of many cancers.
- MeSH
- chromatin genetika metabolismus MeSH
- cyklin-dependentní kinasy genetika metabolismus MeSH
- fosforylace MeSH
- genetická transkripce * MeSH
- histony genetika metabolismus MeSH
- lidé MeSH
- proteiny regulující apoptózu genetika metabolismus MeSH
- proteiny vázající vápník genetika metabolismus MeSH
- regulace genové exprese MeSH
- replikace DNA MeSH
- RNA genetika metabolismus MeSH
- S fáze MeSH
- serin metabolismus MeSH
- vazebná místa MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Leishmaniasis is one of the most important parasitic diseases after malaria. The standard treatment of leishmaniasis includes pentavalent antimonials (SbV); however, these drugs are associated with serious adverse effects. There have been very few studies pertaining to their side effects and mechanism of action in the fetus. This investigation examines the effects of meglumine antimoniate (MA) on the survival rate, angiogenesis and cellular apoptosis in the human umbilical vein endothelial cells (HUVECs). HUVECs were treated with varying doses of MA (100-800 μg/ml) for 24, 48 and 72 h and the survival rate was studied by colorimetric assay, flow cytometry, immunocytochemistry, migration (scratch) assay and tube formation assay. The results of quantitative real-time PCR (qPCR) studies indicated that the most important genes involved in presenting angiogenesis included VEGF and its receptors (Kdr and Flt-1), NP1 and Hif-1α genes including the anti-apoptotic gene of Bcl2, were significantly reduced compared to the control group (p < 0.05). In contrast, the most leading genes involved in the phenomenon of apoptosis were P53, Bax, Bak, Apaf-1 and caspases 3, 8 and 9, which were significantly up regulated compared to the control group (p < 0.05).
- MeSH
- antiprotozoální látky toxicita MeSH
- apoptóza účinky léků MeSH
- C-reaktivní protein genetika MeSH
- endoteliální buňky pupečníkové žíly (lidské) účinky léků fyziologie MeSH
- faktor 1 indukovatelný hypoxií - podjednotka alfa genetika MeSH
- fyziologická neovaskularizace účinky léků MeSH
- kultivované buňky MeSH
- lidé MeSH
- meglumin antimoniát toxicita MeSH
- nádorový supresorový protein p53 genetika MeSH
- pohyb buněk účinky léků MeSH
- proteiny nervové tkáně genetika MeSH
- proteiny regulující apoptózu genetika MeSH
- vaskulární endoteliální růstový faktor A genetika MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
p53 is one of the most studied tumor suppressor proteins that plays an important role in basic biological processes including cell cycle, DNA damage response, apoptosis, and senescence. The human TP53 gene contains alternative promoters that produce N-terminally truncated proteins and can produce several isoforms due to alternative splicing. p53 function is realized by binding to a specific DNA response element (RE), resulting in the transactivation of target genes. Here, we evaluated the influence of quadruplex DNA structure on the transactivation potential of full-length and N-terminal truncated p53α isoforms in a panel of S. cerevisiae luciferase reporter strains. Our results show that a G-quadruplex prone sequence is not sufficient for transcription activation by p53α isoforms, but the presence of this feature in proximity to a p53 RE leads to a significant reduction of transcriptional activity and changes the dynamics between co-expressed p53α isoforms.
- MeSH
- G-kvadruplexy * MeSH
- lidé MeSH
- nádorový supresorový protein p53 genetika metabolismus MeSH
- promotorové oblasti (genetika) genetika MeSH
- protein - isoformy genetika metabolismus MeSH
- proteiny regulující apoptózu genetika metabolismus MeSH
- protoonkogenní proteiny genetika metabolismus MeSH
- responzivní elementy genetika MeSH
- vazba proteinů MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
Brassinosteroid (BR) hormone signaling controls multiple processes during plant growth and development and is initiated at the plasma membrane through the receptor kinase BRASSINOSTEROID INSENSITIVE1 (BRI1) together with co-receptors such as BRI1-ASSOCIATED RECEPTOR KINASE1 (BAK1). BRI1 abundance is regulated by endosomal recycling and vacuolar targeting, but the role of vacuole-related proteins in BR receptor dynamics and BR responses remains elusive. Here, we show that the absence of two DUF300 domain-containing tonoplast proteins, LAZARUS1 (LAZ1) and LAZ1 HOMOLOG1 (LAZ1H1), causes vacuole morphology defects, growth inhibition, and constitutive activation of BR signaling. Intriguingly, tonoplast accumulation of BAK1 was substantially increased and appeared causally linked to enhanced BRI1 trafficking and degradation in laz1 laz1h1 plants. Since unrelated vacuole mutants exhibited normal BR responses, our findings indicate that DUF300 proteins play distinct roles in the regulation of BR signaling by maintaining vacuole integrity required to balance subcellular BAK1 pools and BR receptor distribution.
- MeSH
- Arabidopsis cytologie genetika metabolismus MeSH
- brassinosteroidy metabolismus MeSH
- mutace MeSH
- proteiny huseníčku genetika metabolismus MeSH
- proteiny regulující apoptózu genetika metabolismus MeSH
- signální transdukce * MeSH
- transport proteinů MeSH
- vakuoly metabolismus MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Neurodegenerative disorders, such as Alzheimer's disease (AD) and Parkinson's disease (PD), are increasing in prevalence. Currently, there are no effective and specific treatments for these disorders. Recently, positive effects of the orexigenic hormone ghrelin on memory and learning were demonstrated in mouse models of AD and PD. In this study, we tested the potential neuroprotective properties of a stable and long-lasting ghrelin analog, Dpr(3)ghrelin (Dpr(3)ghr), in SH-SY5Y neuroblastoma cells stressed with 1.2 mM methylglyoxal (MG), a toxic endogenous by-product of glycolysis, and we examined the impact of Dpr(3)ghr on apoptosis. Pre-treatment with both 10(-5) and 10(-7) M Dpr(3)ghr resulted in increased viability in SH-SY5Y cells (determined by MTT staining), as well as reduced cytotoxicity of MG in these cells (determined by LDH assay). Dpr(3)ghr increased viability by altering pro-apoptotic and viability markers: Bax was decreased, Bcl-2 was increased, and the Bax/Bcl-2 ratio was attenuated. The ghrelin receptor GHS-R1 and Dpr(3)ghr-induced activation of PBK/Akt were immuno-detected in SH-SY5Y cells to demonstrate the presence of GHS-R1 and GHS-R1 activation, respectively. We demonstrated that Dpr(3)ghr protected SH-SY5Y cells against MG-induced neurotoxicity and apoptosis. Our data suggest that stable ghrelin analogs may be candidates for the effective treatment of neurodegenerative disorders.
- MeSH
- apoptóza účinky léků MeSH
- ghrelin analogy a deriváty farmakologie MeSH
- glykolýza účinky léků MeSH
- L-laktátdehydrogenasa metabolismus MeSH
- lidé MeSH
- MAP kinasový signální systém účinky léků MeSH
- membránový potenciál mitochondrií účinky léků MeSH
- nádorové buněčné linie MeSH
- neuroprotektivní látky farmakologie MeSH
- neurotoxické syndromy prevence a kontrola MeSH
- proteiny regulující apoptózu biosyntéza genetika MeSH
- pyruvaldehyd toxicita MeSH
- receptory ghrelinu biosyntéza MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
Východiska: Epiteliální ovariální karcinomy jsou v české populaci jednou z nejčastějších příčin úmrtí na gynekologické malignity. Tato skupina nádorů je charakterizována značnou heterogenitou jak z hlediska její patogeneze, tak i odpovědí na terapii. Je otázkou, zda pokroky v objasnění molekulární patogeneze jednotlivých typů epiteliálních ovariálních karcinomů mohou v budoucnu přispět k aplikaci cílené personalizované léčby. Cíle: Tato práce se snaží shrnout současné poznatky o kancerogenezi a molekulární podstatě epiteliálních nádorů ovaria a ukázat na možné využití těchto poznatků v klinické praxi. Pro základní charakterizaci epiteliálních ovariálních karcinomů je využit dualistický model, který rozděluje tyto nádory do dvou skupin na základě odlišného původu a mechanizmu kancerogeneze. Typ I zahrnuje low-grade serózní karcinomy, endometrioidní karcinomy, mucinózní karcinomy a Brennerův tumor, typ II pak high-grade serózní karcinomy. Závěr: Nově získané poznatky získané sekvenováním nové generace ukazují zásadní odlišnosti v genetických alteracích u obou skupin nádorů. Rozdíly v genetické nestabilitě mezi oběma skupinami nádorů určují způsob jejich kancerogeneze a poukazují na nové cesty pro aplikaci cílené terapie. Porucha homologní rekombinace a vysoká genetická nestabilita u nádorů typu II je hlavní příčinou jejich senzitivity k platinovým cytostatikům a inhibitorům PARP (poly-ADP ribose polymerase). Na druhou stranu karcinogeneze méně agresivních, ale často rezistentních nádorů typu I je závislá na aktivaci signalizačních drah PI3K/AKT a RAS/BRAF/MEK/ERK. Cílená inhibice těchto drah u nádorů typu I by tak v budoucnu mohla představovat efektivnější terapii s nižší toxicitou.
Background: Epithelial ovarian carcinomas are one of the most common causes of death among gynecologic malignancies in the Czech population. This group of tumors is characterized by considerable heterogeneity in terms of its pathogenesis and response to therapy. It is questionable whether advances in the elucidation of molecular pathogenesis of various types of epithelial ovarian carcinomas can contribute to application of personalized targeted therapy. Aims: This work aims to summarize current knowledge on carcinogenesis and molecular basis of epithelial ovarian cancers and point out their potential applications in clinical practice. The characterization of the epithelial ovarian carcinomas is based on a dualistic model, which divides these tumors into two groups based on their different origins and mechanisms of carcinogenesis. Type I includes low-grade serous carcinomas, endometrioid carcinomas, mucinous carcinomas and Brenner tumor. Type II then comprises high-grade serous carcinomas. Conclusion: The new findings acquired by next generation sequencing revealed major differences in the genetic alterations in both groups of tumors. Differences in genetic instability between the two groups of tumors determine the mechanisms of their carcinogenesis and show new ways for application of targeted therapy. Deficient homologous recombination and high genetic instability in type II tumors is a prerequisite for efficient application of platinum cytostatics and PARP (poly-ADP ribose polymerase) inhibitors. On the other hand, carcinogenesis of the less aggressive, but often resistant type I tumous is dependent on the activation of signaling pathways PI3K/AKT and RAS/BRAF/MEK/ERK pathway. Targeted inhibition of these pathways could efficiently improve therapy of type I tumors and decrease serious adverse side effects.
- MeSH
- genetická heterogenita MeSH
- lidé MeSH
- mucinózní adenokarcinom diagnóza patologie MeSH
- nádorová transformace buněk genetika patologie MeSH
- nádory endometria patologie MeSH
- nádory vaječníků * diagnóza klasifikace patologie MeSH
- onkogeny fyziologie genetika MeSH
- poruchy opravy DNA genetika patologie MeSH
- protein BRCA1 fyziologie MeSH
- protein BRCA2 fyziologie MeSH
- proteiny regulující apoptózu fyziologie genetika MeSH
- transkripční faktory fyziologie genetika MeSH
- tyrosinkinasy fyziologie genetika MeSH
- Check Tag
- lidé MeSH
- ženské pohlaví MeSH
- Publikační typ
- práce podpořená grantem MeSH
