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https://www.readbyqxmd.com/read/27770010/six3-dosage-mediates-the-pathogenesis-of-holoprosencephaly
#1
Xin Geng, Sandra Acosta, Oleg Lagutin, Hyea Jin Gil, Guillermo Oliver
Holoprosencephaly (HPE) is defined as the incomplete separation of the two cerebral hemispheres. The pathology of HPE is variable and, based on the severity of the defect, HPE is divided into alobar, semilobar, and lobar. Using a novel hypomorphic Six3 allele, we demonstrate in mice that variability in Six3 dosage results in different HPE phenotypes. Furthermore, we show that whereas the semilobar phenotype results from severe downregulation of Shh expression in the rostral diencephalon ventral midline, the alobar phenotype is caused by downregulation of Foxg1 expression in the anterior neural ectoderm...
December 1, 2016: Development
https://www.readbyqxmd.com/read/27760116/chromosome-conformation-elucidates-regulatory-relationships-in-developing-human-brain
#2
Hyejung Won, Luis de la Torre-Ubieta, Jason L Stein, Neelroop N Parikshak, Jerry Huang, Carli K Opland, Michael J Gandal, Gavin J Sutton, Farhad Hormozdiari, Daning Lu, Changhoon Lee, Eleazar Eskin, Irina Voineagu, Jason Ernst, Daniel H Geschwind
Three-dimensional physical interactions within chromosomes dynamically regulate gene expression in a tissue-specific manner. However, the 3D organization of chromosomes during human brain development and its role in regulating gene networks dysregulated in neurodevelopmental disorders, such as autism or schizophrenia, are unknown. Here we generate high-resolution 3D maps of chromatin contacts during human corticogenesis, permitting large-scale annotation of previously uncharacterized regulatory relationships relevant to the evolution of human cognition and disease...
October 19, 2016: Nature
https://www.readbyqxmd.com/read/27737314/analyzing-gene-expression-profiles-in-dilated-cardiomyopathy-via-bioinformatics-methods
#3
Liming Wang, L Zhu, R Luan, L Wang, J Fu, X Wang, L Sui
Dilated cardiomyopathy (DCM) is characterized by ventricular dilatation, and it is a common cause of heart failure and cardiac transplantation. This study aimed to explore potential DCM-related genes and their underlying regulatory mechanism using methods of bioinformatics. The gene expression profiles of GSE3586 were downloaded from Gene Expression Omnibus database, including 15 normal samples and 13 DCM samples. The differentially expressed genes (DEGs) were identified between normal and DCM samples using Limma package in R language...
October 10, 2016: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/27734276/targeted-next-generation-sequencing-the-diagnostic-value-in-early-onset-epileptic-encephalopathy
#4
Sarenur Gokben, Huseyin Onay, Sanem Yilmaz, Tahir Atik, Gul Serdaroglu, Hande Tekin, Ferda Ozkinay
We investigated the genetic background of early-onset epileptic encephalopathy (EE) using targeted next generation sequencing analysis. Thirty sporadic or familial cases associated with early-onset EE were included. An early-onset EE gene panel including sixteen genes (ARX, CDKL5, CNTNAP2, FOLR1, FOXG1, LAMC3, MBD5, MECP2, NTNG1, PCDH19, PNKP, SCN1A, SCN1B, SCN2A, STXBP1, KCNQ2) was constituted. Nine definite and three potential causal mutations in 30 cases (40 %) were identified. All mutations presented heterozygously except one...
October 12, 2016: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/27721656/role-of-mirna-9-in-brain-development
#5
Balachandar Radhakrishnan, A Alwin Prem Anand
MicroRNAs (miRNAs) are a class of small regulatory RNAs involved in gene regulation. The regulation is effected by either translational inhibition or transcriptional silencing. In vertebrates, the importance of miRNA in development was discovered from mice and zebrafish dicer knockouts. The miRNA-9 (miR-9) is one of the most highly expressed miRNAs in the early and adult vertebrate brain. It has diverse functions within the developing vertebrate brain. In this article, the role of miR-9 in the developing forebrain (telencephalon and diencephalon), midbrain, hindbrain, and spinal cord of vertebrate species is highlighted...
2016: Journal of Experimental Neuroscience
https://www.readbyqxmd.com/read/27640358/phenotype-differentiation-of-foxg1-and-mecp2-disorders-a-new-method-for-characterization-of-developmental-encephalopathies
#6
Mandy Ma, Heather R Adams, Laurie E Seltzer, William B Dobyns, Alex R Paciorkowski
OBJECTIVE: To differentiate developmental encephalopathies by creating a novel quantitative phenotyping tool. STUDY DESIGN: We created the Developmental Encephalopathy Inventory (DEI) to differentiate disorders with complex multisystem neurodevelopmental symptoms. We then used the DEI to study the phenotype features of 20 subjects with FOXG1 disorder and 11 subjects with MECP2 disorder. RESULTS: The DEI identified core domains of fine motor and expressive language that were severely impaired in both disorders...
November 2016: Journal of Pediatrics
https://www.readbyqxmd.com/read/27606335/can-manipulation-of-differentiation-conditions-eliminate-proliferative-cells-from-a-population-of-es-cell-derived-forebrain-cells
#7
Sophie V Precious, Claire M Kelly, Nicholas D Allen, Anne E Rosser
There is preliminary evidence that implantation of primary fetal striatal cells provides functional benefit in patients with Huntington's disease, a neurodegenerative condition resulting in loss of medium-sized spiny neurons (MSN) of the striatum. Scarcity of primary fetal tissue means it is important to identify a renewable source of cells from which to derive donor MSNs. Embryonic stem (ES) cells, which predominantly default to telencephalic-like precursors in chemically defined medium (CDM), offer a potentially inexhaustible supply of cells capable of generating the desired neurons...
2016: Neurogenesis (Austin, Tex.)
https://www.readbyqxmd.com/read/27555878/the-effect-of-inhibiting-glycinamide-ribonucleotide-formyl-transferase-on-the-development-of-neural-tube-in-mice
#8
Lin Xu, Li Wang, JianHua Wang, ZhiQiang Zhu, Ge Chang, Ying Guo, XinLi Tian, Bo Niu
BACKGROUND: Folate deficiency is closely related to the development of neural tube defects (NTDs). However, the exact mechanism is not completely understood. This study aims to induce murine NTDs by inhibiting one of the folate metabolic pathways, de novo purine synthesis and preliminarily investigate the potential mechanisms. The key enzyme, glycinamide ribonucleotide formyl transferase (GARFT) was inhibited by a specific inhibitor, lometrexol (DDATHF) in the pregnant mice. METHODS: Pregnant mice were intraperitoneally injected with various doses of DDATHF on gestational day 7...
2016: Nutrition & Metabolism
https://www.readbyqxmd.com/read/27541642/whole-exome-sequencing-of-rett-syndrome-like-patients-reveals-the-mutational-diversity-of-the-clinical-phenotype
#9
Mario Lucariello, Enrique Vidal, Silvia Vidal, Mauricio Saez, Laura Roa, Dori Huertas, Mercè Pineda, Esther Dalfó, Joaquin Dopazo, Paola Jurado, Judith Armstrong, Manel Esteller
Classical Rett syndrome (RTT) is a neurodevelopmental disorder where most of cases carry MECP2 mutations. Atypical RTT variants involve mutations in CDKL5 and FOXG1. However, a subset of RTT patients remains that do not carry any mutation in the described genes. Whole exome sequencing was carried out in a cohort of 21 female probands with clinical features overlapping with those of RTT, but without mutations in the customarily studied genes. Candidates were functionally validated by assessing the appearance of a neurological phenotype in Caenorhabditis elegans upon disruption of the corresponding ortholog gene...
December 2016: Human Genetics
https://www.readbyqxmd.com/read/27486480/partial-monosomy14q-involving-foxg1-and-nova1-in-an-infant-with-microcephaly-seizures-and-severe-developmental-delay
#10
H Fryssira, E Tsoutsou, S Psoni, S Amenta, T Liehr, E Anastasakis, Ch Skentou, A Ntouflia, I Papoulidis, E Manolakos, N Chaliasos
BACKGROUND: FOXG1 gene mutations have been associated with the congenital variant of Rett syndrome (RTT) since the initial description of two patients in 2008. The on-going accumulation of clinical data suggests that the FOXG1-variant of RTT forms a distinguishable phenotype, consisting mainly of postnatal microcephaly, seizures, hypotonia, developmental delay and corpus callosum agenesis. CASE PRESENTATION: We report a 6-month-old female infant, born at 38 weeks of gestation after in vitro fertilization, who presented with feeding difficulties, irritability and developmental delay from the first months of life...
2016: Molecular Cytogenetics
https://www.readbyqxmd.com/read/27442528/apoptotic-activity-of-mecp2-is-enhanced-by-c-terminal-truncating-mutations
#11
Alison A Williams, Vera J Mehler, Christina Mueller, Fernando Vonhoff, Robin White, Carsten Duch
Methyl-CpG binding protein 2 (MeCP2) is a widely abundant, multifunctional protein most highly expressed in post-mitotic neurons. Mutations causing Rett syndrome and related neurodevelopmental disorders have been identified along the entire MECP2 locus, but symptoms vary depending on mutation type and location. C-terminal mutations are prevalent, but little is known about the function of the MeCP2 C-terminus. We employ the genetic efficiency of Drosophila to provide evidence that expression of p.Arg294* (more commonly identified as R294X), a human MECP2 E2 mutant allele causing truncation of the C-terminal domains, promotes apoptosis of identified neurons in vivo...
2016: PloS One
https://www.readbyqxmd.com/read/27426041/development-of-gonadotropin-releasing-hormone-secreting-neurons-from-human-pluripotent-stem-cells
#12
Carina Lund, Kristiina Pulli, Venkatram Yellapragada, Paolo Giacobini, Karolina Lundin, Sanna Vuoristo, Timo Tuuri, Parinya Noisa, Taneli Raivio
Gonadotropin-releasing hormone (GnRH) neurons regulate human puberty and reproduction. Modeling their development and function in vitro would be of interest for both basic research and clinical translation. Here, we report a three-step protocol to differentiate human pluripotent stem cells (hPSCs) into GnRH-secreting neurons. Firstly, hPSCs were differentiated to FOXG1, EMX2, and PAX6 expressing anterior neural progenitor cells (NPCs) by dual SMAD inhibition. Secondly, NPCs were treated for 10 days with FGF8, which is a key ligand implicated in GnRH neuron ontogeny, and finally, the cells were matured with Notch inhibitor to bipolar TUJ1-positive neurons that robustly expressed GNRH1 and secreted GnRH decapeptide into the culture medium...
August 9, 2016: Stem Cell Reports
https://www.readbyqxmd.com/read/27265524/a-novel-cdkl5-mutation-in-a-japanese-patient-with-atypical-rett-syndrome
#13
Antonius Christianto, Syouichi Katayama, Isamu Kameshita, Tetsuya Inazu
Rett syndrome (RTT) is a severe X-linked dominant inheritance disorder with a wide spectrum of clinical manifestations. Mutations in Methyl CpG binding protein 2 (MECP2), Cyclin dependent kinase-like 5 (CDKL5) and Forkhead box G1 (FOXG1) have been associated with classic and/or variant RTT. This study was conducted to identify the responsible gene(s) in atypical RTT patient, and to examine the effect of the mutation on protein function. DNA sequence analysis showed a novel heterozygous mutation in CDKL5 identified as c...
August 1, 2016: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/27232954/gm3-synthase-deficiency-due-to-st3gal5-variants-in-two-korean-female-siblings-masquerading-as-rett-syndrome-like-phenotype
#14
Jin Sook Lee, Yongjin Yoo, Byung Chan Lim, Ki Joong Kim, Junghan Song, Murim Choi, Jong-Hee Chae
There have been a few reports of GM3 synthase deficiency since the disease of the ganglioside biosynthetic pathway was first reported in 2004. It is characterized by infantile-onset epilepsy with severe intellectual disability, blindness, cutaneous dyspigmentation, and choreoathetosis. Here we report the cases of two Korean female siblings with ST3GAL5 variants, who presented with a Rett-like phenotype. They had delayed speech, hand stereotypies with a loss of purposeful hand movements, and choreoathetosis, but no clinical seizures...
August 2016: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/27224923/the-foxg1-foxo-smad-network-balances-proliferation-and-differentiation-of-cortical-progenitors-and-activates-kcnh3-expression-in-mature-neurons
#15
Riccardo Vezzali, Stefan Christopher Weise, Nicole Hellbach, Venissa Machado, Stefanie Heidrich, Tanja Vogel
Transforming growth factor β (TGFβ)-mediated anti-proliferative and differentiating effects promote neuronal differentiation during embryonic central nervous system development. TGFβ downstream signals, composed of activated SMAD2/3, SMAD4 and a FOXO family member, promote the expression of cyclin-dependent kinase inhibitor Cdkn1a. In early CNS development, IGF1/PI3K signaling and the transcription factor FOXG1 inhibit FOXO- and TGFβ-mediated Cdkn1a transcription. FOXG1 prevents cell cycle exit by binding to the SMAD/FOXO-protein complex...
May 21, 2016: Oncotarget
https://www.readbyqxmd.com/read/27171548/enrichment-of-mutations-in-chromatin-regulators-in-people-with-rett-syndrome-lacking-mutations-in-mecp2
#16
Samin A Sajan, Shalini N Jhangiani, Donna M Muzny, Richard A Gibbs, James R Lupski, Daniel G Glaze, Walter E Kaufmann, Steven A Skinner, Fran Annese, Michael J Friez, Jane Lane, Alan K Percy, Jeffrey L Neul
PURPOSE: Rett syndrome (RTT) is a neurodevelopmental disorder caused primarily by de novo mutations in MECP2 and sometimes in CDKL5 and FOXG1. However, some RTT patients lack mutations in these genes. METHODS: Twenty-two RTT patients without apparent MECP2, CDKL5, and FOXG1 mutations were subjected to both whole-exome sequencing and single-nucleotide polymorphism array-based copy-number variant (CNV) analyses. RESULTS: Three patients had MECP2 mutations initially missed by clinical testing...
May 12, 2016: Genetics in Medicine: Official Journal of the American College of Medical Genetics
https://www.readbyqxmd.com/read/27148860/14q13-distal-microdeletion-encompassing-nkx2-1-and-pax9-patient-report-and-refinement-of-the-associated-phenotype
#17
Mattia Gentile, Delia De Mattia, Angela Pansini, Federico Schettini, Antonia Lucia Buonadonna, Manuela Capozza, Romina Ficarella, Nicola Laforgia
Chromosome 14q11-q22 deletion syndrome (OMIM 613457) is a rare genomic disorder whose associated phenotype is heterogeneous, depending on the size, and, mostly, on the deleted region. We report the clinical and molecular characterization of a female newborn, whose phenotype was characterized by poor growth, dysmorphic facial features, subclinical hypothyroidism, and mild reduction of CD3CD8 Lymphocytes with increased CD4/CD8 ratio. By array-CGH, we identified a 4.08 de novo interstitial deletion of the 14q13...
July 2016: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/27062609/rett-like-phenotypes-expanding-the-genetic-heterogeneity-to-the-kcna2-gene-and-first-familial-case-of-cdkl5-related-disease
#18
L Allou, S Julia, D Amsallem, S El Chehadeh, L Lambert, J Thevenon, Y Duffourd, A Saunier, P Bouquet, S Pere, A Moustaïne, L Ruaud, V Roth, P Jonveaux, C Philippe
Several genes have been implicated in Rett syndrome in its typical and variant forms. We applied next-generation sequencing to evaluate for mutations in known or new candidate genes in patients with variant forms of Rett or Rett-like phenotypes of unknown molecular aetiology. In the first step, we used NGS with a custom panel including MECP2, CDKL5, FOXG1, MEF2C and IQSEC2. In addition to a FOXG1 mutation in a patient with all core features of the congenital variant of RTT, we identified a missense (p.Ser240Thr) in CDKL5 in a patient who appeared to be seizure free...
April 7, 2016: Clinical Genetics
https://www.readbyqxmd.com/read/27053772/cultured-networks-of-excitatory-projection-neurons-and-inhibitory-interneurons-for-studying-human-cortical-neurotoxicity
#19
Jin-Chong Xu, Jing Fan, Xueqing Wang, Stephen M Eacker, Tae-In Kam, Li Chen, Xiling Yin, Juehua Zhu, Zhikai Chi, Haisong Jiang, Rong Chen, Ted M Dawson, Valina L Dawson
Translating neuroprotective treatments from discovery in cell and animal models to the clinic has proven challenging. To reduce the gap between basic studies of neurotoxicity and neuroprotection and clinically relevant therapies, we developed a human cortical neuron culture system from human embryonic stem cells or human inducible pluripotent stem cells that generated both excitatory and inhibitory neuronal networks resembling the composition of the human cortex. This methodology used timed administration of retinoic acid to FOXG1(+) neural precursor cells leading to differentiation of neuronal populations representative of the six cortical layers with both excitatory and inhibitory neuronal networks that were functional and homeostatically stable...
April 6, 2016: Science Translational Medicine
https://www.readbyqxmd.com/read/27044840/mir-200b-promotes-the-cell-proliferation-and-metastasis-of-cervical-cancer-by-inhibiting-foxg1
#20
Fei Zeng, Min Xue, Ting Xiao, Yueran Li, Songshu Xiao, Bin Jiang, Caiping Ren
BACKGROUND: Previous studies have revealed the important role of miR-200b in cancer biology, including its upregulation in cervical cancer. However, miR-200b function in cervical cancer progression remains unclear. Thus, this study aims to explore the functional role of miR-200b in cervical cancer development, involving its potential regulation on FoxG1, one transcriptional repressor. METHODS: Thirty paired cervical cancer samples were used to analyze the expression of miR-200b and FoxG1 by real time PCR and western blot analysis...
April 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
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