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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
Sureni V Mullegama, Sarah H Elsea
No abstract text is available yet for this article.
August 2016: European Journal of Human Genetics: EJHG
I Kushima, B Aleksic, M Nakatochi, T Shimamura, T Shiino, A Yoshimi, H Kimura, Y Takasaki, C Wang, J Xing, K Ishizuka, T Oya-Ito, Y Nakamura, Y Arioka, T Maeda, M Yamamoto, M Yoshida, H Noma, S Hamada, M Morikawa, Y Uno, T Okada, T Iidaka, S Iritani, T Yamamoto, M Miyashita, A Kobori, M Arai, M Itokawa, M-C Cheng, Y-A Chuang, C-H Chen, M Suzuki, T Takahashi, R Hashimoto, H Yamamori, Y Yasuda, Y Watanabe, A Nunokawa, T Someya, M Ikeda, T Toyota, T Yoshikawa, S Numata, T Ohmori, S Kunimoto, D Mori, N Iwata, N Ozaki
Recent schizophrenia (SCZ) studies have reported an increased burden of de novo copy number variants (CNVs) and identified specific high-risk CNVs, although with variable phenotype expressivity. However, the pathogenesis of SCZ has not been fully elucidated. Using array comparative genomic hybridization, we performed a high-resolution genome-wide CNV analysis on a mainly (92%) Japanese population (1699 SCZ cases and 824 controls) and identified 7066 rare CNVs, 70.0% of which were small (<100 kb). Clinically significant CNVs were significantly more frequent in cases than in controls (odds ratio=3...
May 31, 2016: Molecular Psychiatry
Sureni V Mullegama, Sarah H Elsea
MBD5-associated neurodevelopmental disorder (MAND) is an umbrella term that describes a group of disorders, 2q23.1 deletion syndrome, 2q23.1 duplication syndrome, and MBD5 variants, that affect the function of methyl-binding domain 5 (MBD5) and share a common set of neurodevelopmental, cognitive, and behavioral impairments. This review provides a comprehensive clinical and molecular synopsis of 2q23.1 deletion syndrome. Approaches to diagnosis, genetic counseling, and up-to-date management are summarized, followed by a discussion of the molecular and functional role of MBD5...
August 2016: European Journal of Human Genetics: EJHG
Andrew E Fry, Elliott Rees, Rose Thompson, Kiran Mantripragada, Penny Blake, Glyn Jones, Sian Morgan, Sian Jose, Hood Mugalaasi, Hayley Archer, Emma McCann, Angus Clarke, Clare Taylor, Sally Davies, Frances Gibbon, Johann Te Water Naude, Louise Hartley, Gareth Thomas, Catharine White, Jaya Natarajan, Rhys H Thomas, Cheney Drew, Seo-Kyung Chung, Mark I Rees, Peter Holmans, Michael J Owen, George Kirov, Daniela T Pilz, Michael P Kerr
BACKGROUND: Copy number variants (CNVs) have been linked to neurodevelopmental disorders such as intellectual disability (ID), autism, epilepsy and psychiatric disease. There are few studies of CNVs in patients with both ID and epilepsy. METHODS: We evaluated the range of rare CNVs found in 80 Welsh patients with ID or developmental delay (DD), and childhood-onset epilepsy. We performed molecular cytogenetic testing by single nucleotide polymorphism array or microarray-based comparative genome hybridisation...
2016: BMC Medical Genetics
Carl Ernst
Several lines of evidence suggest that proliferation and differentiation in neural stem cells (NSCs) are a major convergence point of neurodevelopmental disorders (NDDs). Most genes with truncating mutations are implicated in NSC proliferation and differentiation (e.g., MBD5, CDKL5, and MECP2). Similarly, reciprocal deletion/duplication copy-number variants (CNVs), such as 1q21.1 and 16p11.2, are inversely correlated with head size. In addition, pathways such as MAPK, mTOR, and RAS, which are important in cancer, a disease of uncontrolled cell proliferation, are implicated in NDDs...
May 2016: Trends in Neurosciences
Natalie Trump, Amy McTague, Helen Brittain, Apostolos Papandreou, Esther Meyer, Adeline Ngoh, Rodger Palmer, Deborah Morrogh, Christopher Boustred, Jane A Hurst, Lucy Jenkins, Manju A Kurian, Richard H Scott
BACKGROUND: We sought to investigate the diagnostic yield and mutation spectrum in previously reported genes for early-onset epilepsy and disorders of severe developmental delay. METHODS: In 400 patients with these disorders with no known underlying aetiology and no major structural brain anomaly, we analysed 46 genes using a combination of targeted sequencing on an Illumina MiSeq platform and targeted, exon-level microarray copy number analysis. RESULTS: We identified causative mutations in 71/400 patients (18%)...
May 2016: Journal of Medical Genetics
Yuxiang Li, Heng Deng, Min Miao, Huirong Li, Shengxiong Huang, Songhu Wang, Yongsheng Liu
In tomato (Solanum lycopersicum), high pigment mutations (hp-1 and hp-2) were mapped to genes encoding UV-damaged DNA binding protein 1 (DDB1) and de-etiolated-1 (DET1), respectively. Here we characterized a tomato methyl-CpG-binding domain protein SlMBD5 identified by yeast two-hybrid screening using SlDDB1 as a bait. Yeast two-hybrid assay demonstrated that the physical interaction of SlMBD5 with SlDDB1 is mediated by the C-termini of SlMBD5 and the β-propeller-C (BPC) of SlDDB1. Co-immunoprecipitation analyses revealed that SlMBD5 associates with SlDDB1-interacting partners including SlDET1, SlCUL4, SlRBX1a and SlRBX1b in vivo...
April 2016: New Phytologist
Xi-Ping Yan, He-He Liu, Jun-Ying Liu, Rong-Ping Zhang, Guo-Song Wang, Qing-Qing Li, Ding-Min-Cheng Wang, Liang Li, Ji-Wen Wang
Incubation temperature has an immediate and long-term influence on the embryonic development in birds. DNA methylation as an important environment-induced mechanism could serve as a potential link between embryos' phenotypic variability and temperature variation, which reprogrammed by DNA (cytosine-5)-methyltransferases (DNMTS) and Methyl-CpG binding domain proteins (MBPS) 3&5 (MBD3&5). Five genes in DNMTS and MBPS gene families were selected as target genes, given their important role in epigenetic modification...
October 2015: Poultry Science
Gilles Maussion, Alpha B Diallo, Carolina O Gigek, Elizabeth S Chen, Liam Crapper, Jean-Francois Théroux, Gary G Chen, Cristina Vasuta, Carl Ernst
Several neurodevelopmental disorders (NDDs) are caused by mutations in genes expressed in fetal brain, but little is known about these same genes in adult human brain. Here, we test the hypothesis that genes associated with NDDs continue to have a role in adult human brain to explore the idea that NDD symptoms may be partially a result of their adult function rather than just their neurodevelopmental function. To demonstrate adult brain function, we performed expression analyses and ChIPseq in human neural stem cell(NSC) lines at different developmental stages and adult human brain, targeting two genes associated with NDDs, SATB2 and EHMT1, and the WNT signaling gene TCF7L2, which has not been associated with NDDs...
October 2015: Human Genetics
Antonio Bravo-Oro, Iosif W Lurie, Gabriela Elizondo-Cárdenas, Claudia Peña-Zepeda, Abel Salazar-Martínez, Cecilia Correa-González, José Luis Castrillo, Silvia Avila, Carmen Esmer
Many chromosomal deletions encompassing the 2q23.1 region have been described ranging from small deletions of 38 kb up to >19 Mb. Most phenotypic features of the 2q23.1 deletion syndrome are due to a MBD5 gene loss independent of the size of the deletion. Here, we describe a male patient harboring a novel interstitial deletion encompassing the 2q22.3 q23.3 chromosomal region. Array-CGH revealed a 7.1 Mb deletion causing haploinsufficiency of several genes including MBD5, ACVR2, KIF5C, and EPC2. This patient presents with additional findings to those already described in individuals who have deletions of MBD5 including toes absence of halluces, pure red cell aplasia, and intestinal aganglionosis...
August 2015: American Journal of Medical Genetics. Part A
C O Gigek, E S Chen, V K Ota, G Maussion, H Peng, K Vaillancourt, A B Diallo, J P Lopez, L Crapper, C Vasuta, G G Chen, C Ernst
Genes implicated in neurodevelopmental disorders (NDDs) important in cognition and behavior may have convergent function and several cellular pathways have been implicated, including protein translational control, chromatin modification, and synapse assembly and maintenance. Here, we test the convergent effects of methyl-CpG binding domain 5 (MBD5) and special AT-rich binding protein 2 (SATB2) reduced dosage in human neural stem cells (NSCs), two genes implicated in 2q23.1 and 2q33.1 deletion syndromes, respectively, to develop a generalized model for NDDs...
2015: Translational Psychiatry
Sureni V Mullegama, Joseph T Alaimo, Li Chen, Sarah H Elsea
Roughly 20% of autism spectrum disorders (ASD) are syndromic with a well-established genetic cause. Studying the genes involved can provide insight into the molecular and cellular mechanisms of ASD. 2q23.1 deletion syndrome (causative gene, MBD5) is a recently identified genetic neurodevelopmental disorder associated with ASD. Mutations in MBD5 have been found in ASD cohorts. In this study, we provide a phenotypic update on the prevalent features of 2q23.1 deletion syndrome, which include severe intellectual disability, seizures, significant speech impairment, sleep disturbance, and autistic-like behavioral problems...
2015: International Journal of Molecular Sciences
Sureni V Mullegama, Sarah H Elsea
2q23.1 deletion syndrome is characterized by intellectual disability, speech impairment, seizures, disturbed sleep pattern, behavioral problems, and hypotonia. Core features of this syndrome are due to haploinsufficiency of MBD5. Deletions that include coding and noncoding exons show reduced MBD5 mRNA expression. We report a patient with a neurological and behavioral phenotype similar to 2q23.1 deletion syndrome with an inherited intronic deletion in the 5-prime untranslated region of MBD5. Our data show that this patient has normal MBD5 mRNA expression; therefore, this deletion is likely not causative for 2q23...
2014: Molecular Cytogenetics
Fadi F Hamdan, Myriam Srour, Jose-Mario Capo-Chichi, Hussein Daoud, Christina Nassif, Lysanne Patry, Christine Massicotte, Amirthagowri Ambalavanan, Dan Spiegelman, Ousmane Diallo, Edouard Henrion, Alexandre Dionne-Laporte, Anne Fougerat, Alexey V Pshezhetsky, Sunita Venkateswaran, Guy A Rouleau, Jacques L Michaud
Genetics is believed to have an important role in intellectual disability (ID). Recent studies have emphasized the involvement of de novo mutations (DNMs) in ID but the extent to which they contribute to its pathogenesis and the identity of the corresponding genes remain largely unknown. Here, we report a screen for DNMs in subjects with moderate or severe ID. We sequenced the exomes of 41 probands and their parents, and confirmed 81 DNMs affecting the coding sequence or consensus splice sites (1.98 DNMs/proband)...
October 2014: PLoS Genetics
Sureni V Mullegama, Loren Pugliesi, Brooke Burns, Zalak Shah, Raiha Tahir, Yanghong Gu, David L Nelson, Sarah H Elsea
Individuals with autism spectrum disorders (ASD) who have an identifiable single-gene neurodevelopmental disorder (NDD), such as fragile X syndrome (FXS, FMR1), Smith-Magenis syndrome (SMS, RAI1), or 2q23.1 deletion syndrome (del 2q23.1, MBD5) share phenotypic features, including a high prevalence of sleep disturbance. We describe the circadian deficits in del 2q23.1 through caregiver surveys in which we identify several frequent sleep anomalies, including night/early awakenings, coughing/snoring loudly, and difficulty falling asleep...
June 2015: European Journal of Human Genetics: EJHG
Vladimir Camarena, Lei Cao, Clemer Abad, Alexander Abrams, Yaima Toledo, Kimi Araki, Masatake Araki, Katherina Walz, Juan I Young
2q23.1 microdeletion syndrome is characterized by intellectual disability, motor delay, autistic-like behaviors, and a distinctive craniofacial phenotype. All patients carry a partial or total deletion of methyl-CpG-binding domain protein 5 (MBD5), suggesting that haploinsufficiency of this gene is responsible for the phenotype. To confirm this hypothesis and to examine the role of MBD5 in vivo, we have generated and characterized an Mbd5 gene-trap mouse model. Our study indicates that the Mbd5(+/) (GT) mouse model recapitulates most of the hallmark phenotypes observed in 2q23...
2014: EMBO Molecular Medicine
Deborah Y Kwon, Zhaolan Zhou
No abstract text is available yet for this article.
2014: EMBO Molecular Medicine
Xiaonan Du, Yu An, Lifei Yu, Renchao Liu, Yanrong Qin, Xiaohong Guo, Daokan Sun, Shuizhen Zhou, Bailin Wu, Yong-Hui Jiang, Yi Wang
BACKGROUND: Infantile spasms (IS) is a specific type of epileptic encephalopathy associated with severe developmental disabilities. Genetic factors are strongly implicated in IS, however, the exact genetic defects remain unknown in the majority of cases. Rare mutations in a single gene or in copy number variants (CNVs) have been implicated in IS of children in Western countries. The objective of this study was to dissect the role of copy number variations in Chinese children with infantile spasms...
2014: BMC Medical Genetics
Wen-Hann Tan, Lynne M Bird, Ronald L Thibert, Charles A Williams
Angelman syndrome (AS) is caused by a lack of expression of the maternally inherited UBE3A gene in the brain. However, about 10% of individuals with a clinical diagnosis of AS do not have an identifiable molecular defect. It is likely that most of those individuals have an AS-like syndrome that is clinically and molecularly distinct from AS. These AS-like syndromes can be broadly classified into chromosomal microdeletion and microduplication syndromes, and single-gene disorders. The microdeletion/microduplication syndromes are now easily identified by chromosomal microarray analysis and include Phelan–McDermid syndrome (chromosome 22q13...
April 2014: American Journal of Medical Genetics. Part A
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