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https://www.readbyqxmd.com/read/29330883/genotype-phenotype-correlations-in-individuals-with-pathogenic-rere-variants
#1
Valerie K Jordan, Brieana Fregeau, Xiaoyan Ge, Jessica Giordano, Ronald J Wapner, Tugce B Balci, Melissa T Carter, John A Bernat, Amanda N Moccia, Anshika Srivastava, Donna M Martin, Stephanie L Bielas, John Pappas, Melissa D Svoboda, Marlène Rio, Nathalie Boddaert, Vincent Cantagrel, Andrea M Lewis, Fernando Scaglia, Jennefer N Kohler, Jonathan A Bernstein, Annika M Dries, Jill A Rosenfeld, Colette DeFilippo, Willa Thorson, Yaping Yang, Elliott H Sherr, Weimin Bi, Daryl A Scott
Heterozygous variants in the arginine-glutamic acid dipeptide repeats gene (RERE) have been shown to cause neurodevelopmental disorder with or without anomalies of the brain, eye, or heart (NEDBEH). Here we report nine individuals with NEDBEH who carry partial deletions or deleterious sequence variants in RERE. These variants were found to be de novo in all cases in which parental samples were available. An analysis of data from individuals with NEDBEH suggests that point mutations affecting the Atrophin-1 domain of RERE are associated with an increased risk of structural eye defects, congenital heart defects, renal anomalies and sensorineural hearing loss when compared to loss-of-function variants that are likely to lead to haploinsufficiency...
January 13, 2018: Human Mutation
https://www.readbyqxmd.com/read/29321579/differentiation-potential-of-pluripotent-stem-cells-correlates-to-the-level-of-chd7
#2
Takako Yamamoto, Chiemi Takenaka, Yusuke Yoda, Yasuhiro Oshima, Kenichi Kagawa, Hiroshi Miyajima, Tetsuji Sasaki, Shin Kawamata
Embryonic Stem Cells (ESC) possesses two distinct features; self-renewal and the potential to differentiate. Here we show the differentiation potential and growth rate of ESC correlates positively with the expression level of the gene encoding chromodomain helicase DNA binding protein 7 (CHD7). When ESCs are maintained in feeder-free conditions and single cell seeding, ESC KhES-1 having 4520 copies or more of CHD7 in 5 ng total RNA show differentiation potential, but this is lost when the CHD7 copy number is reduced in KhES-1 to less than 696 by alternative culture conditions...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29311329/dysregulation-of-cotranscriptional-alternative-splicing-underlies-charge-syndrome
#3
Catherine Bélanger, Félix-Antoine Bérubé-Simard, Elizabeth Leduc, Guillaume Bernas, Philippe M Campeau, Seema R Lalani, Donna M Martin, Stephanie Bielas, Amanda Moccia, Anshika Srivastava, David W Silversides, Nicolas Pilon
CHARGE syndrome-which stands for coloboma of the eye, heart defects, atresia of choanae, retardation of growth/development, genital abnormalities, and ear anomalies-is a severe developmental disorder with wide phenotypic variability, caused mainly by mutations in CHD7 (chromodomain helicase DNA-binding protein 7), known to encode a chromatin remodeler. The genetic lesions responsible for CHD7 mutation-negative cases are unknown, at least in part because the pathogenic mechanisms underlying CHARGE syndrome remain poorly defined...
January 8, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29302581/novel-genetic-associations-between-lung-cancer-and-indoor-radon-exposure
#4
Jung Ran Choi, Sang-Baek Koh, Seong Yong Park, Hye Run Kim, Hyojin Lee, Dae Ryong Kang
Background: Lung cancer is the leading cause of cancer-related death worldwide, for which smoking is considered as the primary risk factor. The present study was conducted to determine whether genetic alterations induced by radon exposure are associated with the susceptible risk of lung cancer in never smokers. Methods: To accurately identify mutations within individual tumors, next generation sequencing was conduct for 19 pairs of lung cancer tissue. The associations of germline and somatic variations with radon exposure were visualized using OncoPrint and heatmap graphs...
December 2017: Journal of Cancer Prevention
https://www.readbyqxmd.com/read/29300383/genetic-analysis-of-charge-syndrome-identifies-overlapping-molecular-biology
#5
Amanda Moccia, Anshika Srivastava, Jennifer M Skidmore, John A Bernat, Marsha Wheeler, Jessica X Chong, Deborah Nickerson, Michael Bamshad, Margaret A Hefner, Donna M Martin, Stephanie L Bielas
PurposeCHARGE syndrome is an autosomal-dominant, multiple congenital anomaly condition characterized by vision and hearing loss, congenital heart disease, and malformations of craniofacial and other structures. Pathogenic variants in CHD7, encoding adenosine triphosphate-dependent chromodomain helicase DNA binding protein 7, are present in the majority of affected individuals. However, no causal variant can be found in 5-30% (depending on the cohort) of individuals with a clinical diagnosis of CHARGE syndrome...
January 4, 2018: Genetics in Medicine: Official Journal of the American College of Medical Genetics
https://www.readbyqxmd.com/read/29280744/update-on-the-genetics-of-idiopathic-hypogonadotropic-hypogonadism
#6
A Kemal Topaloğlu
Traditionally, idiopathic hypogonadotropic hypogonadism (IHH) is divided into two major categories: Kallmann syndrome (KS) and normosmic IHH (nIHH). To date, inactivating variants in more than 50 genes have been reported to cause IHH. These mutations are estimated to account for up to 50% of all apparently hereditary cases. Identification of further causative gene mutations is expected to be more feasible with the increasing use of whole exome/genome sequencing. Presence of more than one IHH-associated mutant gene in a given patient/pedigree (oligogenic inheritance) is seen in 10-20% of all IHH cases...
December 27, 2017: Journal of Clinical Research in Pediatric Endocrinology
https://www.readbyqxmd.com/read/29277338/hypothalamic-abnormalities-growth-failure-due-to-defects-of-the-ghrh-receptor
#7
Manuel H Aguiar-Oliveira, Caridad Davalos, Viviane C Campos, Luiz A Oliveira Neto, Cindi G Marinho, Carla R P Oliveira
Several acquired or congenital hypothalamic abnormalities may cause growth failure (GF). We described two of these congenital abnormalities. First, a case of CHARGE syndrome, an epigenetic disorder mostly caused by heterozygous mutations in the gene encoding CHD7, a chromatin remodeling protein, causing several malformations, some life-threatening, with additional secondary hypothalamus-hypophyseal dysfunction, including GF. Second, a cohort of individuals with genetic isolated severe GH deficiency (IGHD), due to a homozygous mutation in the GH-releasing hormone (GHRH) receptor gene described in Itabaianinha County, in northeast Brazil...
December 20, 2017: Growth Hormone & IGF Research
https://www.readbyqxmd.com/read/29212025/convergence-of-bmi1-and-chd7-on-erk-signaling-in-medulloblastoma
#8
Sara Badodi, Adrian Dubuc, Xinyu Zhang, Gabriel Rosser, Mariane Da Cunha Jaeger, Michelle M Kameda-Smith, Anca Sorana Morrissy, Paul Guilhamon, Philipp Suetterlin, Xiao-Nan Li, Loredana Guglielmi, Ashirwad Merve, Hamza Farooq, Mathieu Lupien, Sheila K Singh, M Albert Basson, Michael D Taylor, Silvia Marino
We describe molecular convergence between BMI1 and CHD7 in the initiation of medulloblastoma. Identified in a functional genomic screen in mouse models, a BMI1High;CHD7Low expression signature within medulloblastoma characterizes patients with poor overall survival. We show that BMI1-mediated repression of the ERK1/2 pathway leads to increased proliferation and tumor burden in primary human MB cells and in a xenograft model, respectively. We provide evidence that repression of the ERK inhibitor DUSP4 by BMI1 is dependent on a more accessible chromatin configuration in G4 MB cells with low CHD7 expression...
December 5, 2017: Cell Reports
https://www.readbyqxmd.com/read/29191495/atopic-disorders-in-charge-syndrome-a-retrospective-study-and-literature-review
#9
Fang Kong, Donna M Martin
BACKGROUND: Atopic disorders have been reported in CHARGE syndrome, but the prevalence and underlying mechanisms are not known. METHODS: We performed a retrospective study of atopic disorders in 23 individuals with CHARGE syndrome, and reviewed other published reports of atopic disorders in CHARGE syndrome. We assayed for enrichment of atopic disorders in CHARGE syndrome based on gender and presence of a CHD7 pathogenic variant. RESULTS: In our cohort, 65% (15/23) of individuals with CHARGE syndrome were found to have a pathogenic CHD7 variant...
November 27, 2017: European Journal of Medical Genetics
https://www.readbyqxmd.com/read/29179815/charge-syndrome-modeling-using-patient-ipscs-reveals-defective-migration-of-neural-crest-cells-harboring-chd7-mutations
#10
Hironobu Okuno, Francois Renault Mihara, Shigeki Ohta, Kimiko Fukuda, Kenji Kurosawa, Wado Akamatsu, Tsukasa Sanosaka, Jun Kohyama, Kanehiro Hayashi, Kazunori Nakajima, Takao Takahashi, Joanna Wysocka, Kenjiro Kosaki, Hideyuki Okano
CHARGE syndrome is caused by heterozygous mutations in the chromatin remodeler, CHD7, and is characterized by a set of malformations that, on clinical grounds, were historically postulated to arise from defects in neural crest formation during embryogenesis. To better delineate neural crest defects in CHARGE syndrome, we generated induced pluripotent stem cells (iPSCs) from two patients with typical syndrome manifestations, and characterized neural crest cells differentiated in vitro from these iPSCs (iPSC-NCCs)...
November 28, 2017: ELife
https://www.readbyqxmd.com/read/29178447/phenotype-and-genotype-analysis-of-a-french-cohort-of-119-patients-with-charge-syndrome
#11
Marine Legendre, Véronique Abadie, Tania Attié-Bitach, Nicole Philip, Tiffany Busa, Dominique Bonneau, Estelle Colin, Hélène Dollfus, Didier Lacombe, Annick Toutain, Sophie Blesson, Sophie Julia, Dominique Martin-Coignard, David Geneviève, Bruno Leheup, Sylvie Odent, Pierre-Simon Jouk, Sandra Mercier, Laurence Faivre, Catherine Vincent-Delorme, Christine Francannet, Sophie Naudion, Michèle Mathieu-Dramard, Marie-Ange Delrue, Alice Goldenberg, Delphine Héron, Philippe Parent, Renaud Touraine, Valérie Layet, Damien Sanlaville, Chloé Quélin, Sébastien Moutton, Mélanie Fradin, Aurélia Jacquette, Sabine Sigaudy, Lucile Pinson, Pierre Sarda, Anne-Marie Guerrot, Massimiliano Rossi, Alice Masurel-Paulet, Salima El Chehadeh, Xavier Piguel, Montserrat Rodriguez-Ballesteros, Stéphanie Ragot, Stanislas Lyonnet, Frédéric Bilan, Brigitte Gilbert-Dussardier
CHARGE syndrome (CS) is a genetic disorder whose first description included Coloboma, Heart disease, Atresia of choanae, Retarded growth and development, Genital hypoplasia, and Ear anomalies and deafness, most often caused by a genetic mutation in the CHD7 gene. Two features were then added: semicircular canal anomalies and arhinencephaly/olfactory bulb agenesis, with classification of typical, partial, or atypical forms on the basis of major and minor clinical criteria. The detection rate of a pathogenic variant in the CHD7 gene varies from 67% to 90%...
November 27, 2017: American Journal of Medical Genetics. Part C, Seminars in Medical Genetics
https://www.readbyqxmd.com/read/29171162/new-insights-and-advances-in-charge-syndrome-diagnosis-etiologies-treatments-and-research-discoveries
#12
Conny van Ravenswaaij-Arts, Donna M Martin
CHARGE syndrome is a multiple congenital anomaly condition caused, in a majority of individuals, by loss of function pathogenic variants in the gene CHD7. In this special issue of the American Journal of Medical Genetics part C, authors of eleven manuscripts describe specific organ system features of CHARGE syndrome, with a focus on recent developments in diagnosis, etiologies, and treatments. Since 2004, when CHD7 was identified as the major causative gene in CHARGE, several animal models (mice, zebrafish, flies, and frog) and cell-based systems have been developed to explore the underlying pathophysiology of this condition...
November 24, 2017: American Journal of Medical Genetics. Part C, Seminars in Medical Genetics
https://www.readbyqxmd.com/read/29168327/distinct-cerebellar-foliation-anomalies-in-a-chd7-haploinsufficient-mouse-model-of-charge-syndrome
#13
Danielle E Whittaker, Sahrunizam Kasah, Alex P A Donovan, Jacob Ellegood, Kimberley L H Riegman, Holger A Volk, Imelda McGonnell, Jason P Lerch, M Albert Basson
Mutations in the gene encoding the ATP dependent chromatin-remodeling factor, CHD7 are the major cause of CHARGE (Coloboma, Heart defects, Atresia of the choanae, Retarded growth and development, Genital-urinary anomalies, and Ear defects) syndrome. Neurodevelopmental defects and a range of neurological signs have been identified in individuals with CHARGE syndrome, including developmental delay, lack of coordination, intellectual disability, and autistic traits. We previously identified cerebellar vermis hypoplasia and abnormal cerebellar foliation in individuals with CHARGE syndrome...
November 23, 2017: American Journal of Medical Genetics. Part C, Seminars in Medical Genetics
https://www.readbyqxmd.com/read/29152903/reproductive-endocrine-phenotypes-relating-to-chd7-mutations-in-humans
#14
REVIEW
Ravikumar Balasubramanian, William F Crowley
Mutations in the gene CHD7 cause CHARGE syndrome, a rare multi-organ syndromic disorder. Gonadal defects are common in individuals with CHARGE syndrome (seen in ∼60-80% of cases) and represent the letter "G" in the CHARGE syndrome acronym. The gonadal defect in CHARGE syndrome results from congenital deficiency of the hypothalamic hormone Gonadotropin-releasing hormone (GnRH), which manifests clinically as pubertal failure and infertility, and biochemically as hypogonadotropic hypogonadism (low sex steroid hormone levels with inappropriately normal or low gonadotropin levels)...
November 20, 2017: American Journal of Medical Genetics. Part C, Seminars in Medical Genetics
https://www.readbyqxmd.com/read/29144511/evaluating-charge-syndrome-in-congenital-hypogonadotropic-hypogonadism-patients-harboring-chd7-variants
#15
Cheng Xu, Daniele Cassatella, Almer M van der Sloot, Richard Quinton, Michael Hauschild, Christian De Geyter, Christa Flück, Katrin Feller, Deborah Bartholdi, Attila Nemeth, Irene Halperin, Sandra Pekic Djurdjevic, Philippe Maeder, Georgios Papadakis, Andrew A Dwyer, Laura Marino, Lucie Favre, Duarte Pignatelli, Nicolas J Niederländer, James Acierno, Nelly Pitteloud
PurposeCongenital hypogonadotropic hypogonadism (CHH), a rare genetic disease caused by gonadotropin-releasing hormone deficiency, can also be part of complex syndromes (e.g., CHARGE syndrome). CHD7 mutations were reported in 60% of patients with CHARGE syndrome, and in 6% of CHH patients. However, the definition of CHD7 mutations was variable, and the associated CHARGE signs in CHH were not systematically examined.MethodsRare sequencing variants (RSVs) in CHD7 were identified through exome sequencing in 116 CHH probands, and were interpreted according to American College of Medical Genetics and Genomics guidelines...
November 16, 2017: Genetics in Medicine: Official Journal of the American College of Medical Genetics
https://www.readbyqxmd.com/read/29082625/charged-with-neural-crest-defects
#16
REVIEW
Silke Pauli, Ruchi Bajpai, Annette Borchers
Neural crest cells are highly migratory pluripotent cells that give rise to diverse derivatives including cartilage, bone, smooth muscle, pigment, and endocrine cells as well as neurons and glia. Abnormalities in neural crest-derived tissues contribute to the etiology of CHARGE syndrome, a complex malformation disorder that encompasses clinical symptoms like coloboma, heart defects, atresia of the choanae, retarded growth and development, genital hypoplasia, ear anomalies, and deafness. Mutations in the chromodomain helicase DNA-binding protein 7 (CHD7) gene are causative of CHARGE syndrome and loss-of-function data in different model systems have firmly established a role of CHD7 in neural crest development...
October 30, 2017: American Journal of Medical Genetics. Part C, Seminars in Medical Genetics
https://www.readbyqxmd.com/read/29082607/inner-ear-manifestations-in-charge-abnormalities-treatments-animal-models-and-progress-toward-treatments-in-auditory-and-vestibular-structures
#17
REVIEW
Daniel I Choo, Kareem O Tawfik, Donna M Martin, Yehoash Raphael
The inner ear contains the sensory organs for hearing and balance. Both hearing and balance are commonly affected in individuals with CHARGE syndrome (CS), an autosomal dominant condition caused by heterozygous pathogenic variants in the CHD7 gene. Semicircular canal dysplasia or aplasia is the single most prevalent feature in individuals with CHARGE leading to deficient gross motor skills and ambulation. Identification of CHD7 as the major gene affected in CHARGE has enabled acceleration of research in this field...
October 30, 2017: American Journal of Medical Genetics. Part C, Seminars in Medical Genetics
https://www.readbyqxmd.com/read/29046629/cerebellar-vermis-and-midbrain-hypoplasia-upon-conditional-deletion-of-chd7-from-the-embryonic-mid-hindbrain-region
#18
Alex P A Donovan, Tian Yu, Jacob Ellegood, Kimberley L H Riegman, Christa de Geus, Conny van Ravenswaaij-Arts, Cathy Fernandes, Jason P Lerch, M Albert Basson
Reduced fibroblast growth factor (FGF) signaling from the mid-hindbrain or isthmus organizer (IsO) during early embryonic development results in hypoplasia of the midbrain and cerebellar vermis. We previously reported evidence for reduced Fgf8 expression and FGF signaling in the mid-hindbrain region of embryos heterozygous for Chd7, the gene mutated in CHARGE (Coloboma, Heart defects, choanal Atresia, Retarded growth and development, Genitourinary anomalies and Ear defects) syndrome. However, Chd7(+/-) animals only exhibit mild cerebellar vermis anomalies...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/29033785/versatile-roles-of-the-chromatin-remodeler-chd7-during-brain-development-and-disease
#19
REVIEW
Weijun Feng, Chunxuan Shao, Hai-Kun Liu
CHD7 (Chromo-Helicase-DNA binding protein 7) protein is an ATP-dependent chromatin remodeler. Heterozygous mutation of the CHD7 gene causes a severe congenital disease known as CHARGE syndrome. Most CHARGE syndrome patients have brain structural anomalies, implicating an important role of CHD7 during brain development. In this review, we summarize studies dissecting developmental functions of CHD7 in the brain and discuss pathogenic mechanisms behind neurodevelopmental defects caused by mutation of CHD7. As we discussed, CHD7 protein exhibits a remarkably specific and dynamic expression pattern in the brain...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/29018080/chd7-deficiency-delays-leukemogenesis-in-mice-induced-by-cbfb-myh11
#20
Tao Zhen, Erika Kwon, Ling Zhao, Jingmei Hsu, R Katherine Hyde, Ying Lu, Lemlem Alemu, Nancy A Speck, P Paul Liu
Inversion of chromosome 16 is a consistent finding in patients with acute myeloid leukemia subtype M4 with eosinophilia (AML M4Eo), which generates a CBFB-MYH11 fusion gene. Previous studies showed that the interaction between CBFβ-SMMHC (encoded by CBFB-MYH11) and RUNX1 plays a critical role in the pathogenesis of this leukemia. Recently, it was shown that chromodomain-helicase-DNA binding protein 7 (CHD7) interacts with RUNX1 and suppresses RUNX1-induced expansion of hematopoietic stem and progenitor cells...
October 10, 2017: Blood
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