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Journal of Medical Genetics

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https://www.readbyqxmd.com/read/27920058/a-novel-somatic-mutation-achieves-partial-rescue-in-a-child-with-hutchinson-gilford-progeria-syndrome
#1
Daniel Z Bar, Martin F Arlt, Joan F Brazier, Wendy E Norris, Susan E Campbell, Peter Chines, Delphine Larrieu, Stephen P Jackson, Francis S Collins, Thomas W Glover, Leslie B Gordon
BACKGROUND: Hutchinson-Gilford progeria syndrome (HGPS) is a fatal sporadic autosomal dominant premature ageing disease caused by single base mutations that optimise a cryptic splice site within exon 11 of the LMNA gene. The resultant disease-causing protein, progerin, acts as a dominant negative. Disease severity relies partly on progerin levels. METHODS AND RESULTS: We report a novel form of somatic mosaicism, where a child possessed two cell populations with different HGPS disease-producing mutations of the same nucleotide-one producing severe HGPS and one mild HGPS...
December 5, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27899421/the-importance-of-dynamic-re-analysis-in-diagnostic-whole-exome-sequencing
#2
Anna C Need, Vandana Shashi, Kelly Schoch, Slavé Petrovski, David B Goldstein
No abstract text is available yet for this article.
November 29, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27884935/diagnostic-value-of-exome-and-whole-genome-sequencing-in-craniosynostosis
#3
Kerry A Miller, Stephen R F Twigg, Simon J McGowan, Julie M Phipps, Aimée L Fenwick, David Johnson, Steven A Wall, Peter Noons, Katie E M Rees, Elizabeth A Tidey, Judith Craft, John Taylor, Jenny C Taylor, Jacqueline A C Goos, Sigrid M A Swagemakers, Irene M J Mathijssen, Peter J van der Spek, Helen Lord, Tracy Lester, Noina Abid, Deirdre Cilliers, Jane A Hurst, Jenny E V Morton, Elizabeth Sweeney, Astrid Weber, Louise C Wilson, Andrew O M Wilkie
BACKGROUND: Craniosynostosis, the premature fusion of one or more cranial sutures, occurs in ∼1 in 2250 births, either in isolation or as part of a syndrome. Mutations in at least 57 genes have been associated with craniosynostosis, but only a minority of these are included in routine laboratory genetic testing. METHODS: We used exome or whole genome sequencing to seek a genetic cause in a cohort of 40 subjects with craniosynostosis, selected by clinical or molecular geneticists as being high-priority cases, and in whom prior clinically driven genetic testing had been negative...
November 24, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27876694/hypersuccinylacetonaemia-and-normal-liver-function-in-maleylacetoacetate-isomerase-deficiency
#4
Hao Yang, Walla Al-Hertani, Denis Cyr, Rachel Laframboise, Guy Parizeault, Shu Pei Wang, Francis Rossignol, Marie-Thérèse Berthier, Yves Giguère, Paula J Waters, Grant A Mitchell
BACKGROUND: A high level of succinylacetone (SA) in blood is a sensitive, specific newborn screening marker for hepatorenal tyrosinemia type 1 (HT1, MIM 276700) caused by deficiency of fumarylacetoacetate hydrolase (FAH). Newborns with HT1 are usually clinically asymptomatic but show liver dysfunction with coagulation abnormalities (prolonged prothrombin time and/or high international normalised ratio). Early treatment with nitisinone (NTBC) plus dietary restriction of tyrosine and phenylalanine prevents the complications of severe liver disease and neurological crises...
November 22, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27872154/genetic-determinants-of-myocardial-dysfunction
#5
REVIEW
Xianchi Li, Peiying Zhang
Heart failure (HF) is a major killer with high morbidity and mortality and nearly 37.7 million people are affected by HF globally, making this a global epidemic. HF is a complex pathophysiological syndrome in which the mechanical function of heart for pumping blood is compromised. Cardiac structural and functional abnormalities culminate in decreased cardiac output along with increased intracardiac pressures under resting or stress conditions, leading to HF. Besides the acquired risk factors, the independent role of hereditary and genetic factors in the development, progression and prognosis of HF remains to be established...
November 21, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27856506/risk-assessment-of-maternally-inherited-sdhd-paraganglioma-and-phaeochromocytoma
#6
Nelly Burnichon, Jean-Michaël Mazzella, Delphine Drui, Laurence Amar, Jérôme Bertherat, Isabelle Coupier, Brigitte Delemer, Isabelle Guilhem, Philippe Herman, Véronique Kerlan, Antoine Tabarin, Nelly Wion, Khadija Lahlou-Laforet, Judith Favier, Anne-Paule Gimenez-Roqueplo
BACKGROUND: Germline mutations in the SDHD tumour suppressor gene (11q23.1) predispose to phaeochromocytomas and paragangliomas (PPGL) mainly on a paternal transmission. However, PPGL have been recently reported in three carriers of a maternally inherited SDHD mutation. OBJECTIVE: To assess the risk of PPGL occurrence on maternal transmission of SDHD mutation. METHODS: Pedigrees of 80 SDHD-related families have been reviewed. 35 asymptomatic subjects carrying a maternally transmitted SDHD mutation were identified...
November 17, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27834756/oral-pharmacological-chaperone-migalastat-compared-with-enzyme-replacement-therapy-in-fabry-disease-18-month-results-from-the-randomised-phase-iii-attract-study
#7
Derralynn A Hughes, Kathleen Nicholls, Suma P Shankar, Gere Sunder-Plassmann, David Koeller, Khan Nedd, Gerard Vockley, Takashi Hamazaki, Robin Lachmann, Toya Ohashi, Iacopo Olivotto, Norio Sakai, Patrick Deegan, David Dimmock, François Eyskens, Dominique P Germain, Ozlem Goker-Alpan, Eric Hachulla, Ana Jovanovic, Charles M Lourenco, Ichiei Narita, Mark Thomas, William R Wilcox, Daniel G Bichet, Raphael Schiffmann, Elizabeth Ludington, Christopher Viereck, John Kirk, Julie Yu, Franklin Johnson, Pol Boudes, Elfrida R Benjamin, David J Lockhart, Carrolee Barlow, Nina Skuban, Jeffrey P Castelli, Jay Barth, Ulla Feldt-Rasmussen
BACKGROUND: Fabry disease is an X-linked lysosomal storage disorder caused by GLA mutations, resulting in α-galactosidase (α-Gal) deficiency and accumulation of lysosomal substrates. Migalastat, an oral pharmacological chaperone being developed as an alternative to intravenous enzyme replacement therapy (ERT), stabilises specific mutant (amenable) forms of α-Gal to facilitate normal lysosomal trafficking. METHODS: The main objective of the 18-month, randomised, active-controlled ATTRACT study was to assess the effects of migalastat on renal function in patients with Fabry disease previously treated with ERT...
November 10, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27821657/the-ucl-low-density-lipoprotein-receptor-gene-variant-database-pathogenicity-update
#8
Sarah Leigh, Marta Futema, Ros Whittall, Alison Taylor-Beadling, Maggie Williams, Johan T den Dunnen, Steve E Humphries
BACKGROUND: Familial hypercholesterolaemia (OMIM 143890) is most frequently caused by variations in the low-density lipoprotein receptor (LDLR) gene. Predicting whether novel variants are pathogenic may not be straightforward, especially for missense and synonymous variants. In 2013, the Association of Clinical Genetic Scientists published guidelines for the classification of variants, with categories 1 and 2 representing clearly not or unlikely pathogenic, respectively, 3 representing variants of unknown significance (VUS), and 4 and 5 representing likely to be or clearly pathogenic, respectively...
November 7, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27811305/ammecr1-a-single-point-mutation-causes-developmental-delay-midface-hypoplasia-and-elliptocytosis
#9
Gaia Andreoletti, Eleanor G Seaby, Jennifer M Dewing, Ita O'Kelly, Katherine Lachlan, Rodney D Gilbert, Sarah Ennis
BACKGROUND: Deletions in the Xq22.3-Xq23 region, inclusive of COL4A5, have been associated with a contiguous gene deletion syndrome characterised by Alport syndrome with intellectual disability (Mental retardation), Midface hypoplasia and Elliptocytosis (AMME). The extrarenal biological and clinical significance of neighbouring genes to the Alport locus has been largely speculative. We sought to discover a genetic cause for two half-brothers presenting with nephrocalcinosis, early speech and language delay and midface hypoplasia with submucous cleft palate and bifid uvula...
November 3, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27811304/the-cerebellum-and-embodied-semantics-evidence-from-a-case-of-genetic-ataxia-due-to-stub1-mutations
#10
Adolfo M García, Sofía Abrevaya, Giselle Kozono, Indira García Cordero, Marta Córdoba, Marcelo Andrés Kauffman, Ricardo Pautassi, Edinson Muñoz, Lucas Sedeño, Agustín Ibáñez
No abstract text is available yet for this article.
November 3, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27799409/acbd5-deficiency-causes-a-defect-in-peroxisomal-very-long-chain-fatty-acid-metabolism
#11
Sacha Ferdinandusse, Kim D Falkenberg, Janet Koster, Petra A Mooyer, Richard Jones, Carlo W T van Roermund, Amy Pizzino, Michael Schrader, Ronald J A Wanders, Adeline Vanderver, Hans R Waterham
BACKGROUND: Acyl-CoA binding domain containing protein 5 (ACBD5) is a peroxisomal membrane protein with a cytosolic acyl-CoA binding domain. Because of its acyl-CoA binding domain, ACBD5 has been assumed to function as an intracellular carrier of acyl-CoA esters. In addition, a role for ACBD5 in pexophagy has been suggested. However, the precise role of ACBD5 in peroxisomal metabolism and/or functioning has not yet been established. Previously, a genetic ACBD5 deficiency was identified in three siblings with retinal dystrophy and white matter disease...
October 31, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27799408/congenital-valvular-defects-associated-with-deleterious-mutations-in-the-pld1-gene
#12
Asaf Ta-Shma, Kai Zhang, Ekaterina Salimova, Alma Zernecke, Daniel Sieiro-Mosti, David Stegner, Milena Furtado, Avraham Shaag, Zeev Perles, Bernhard Nieswandt, Azaria J J T Rein, Nadia Rosenthal, Aaron M Neiman, Orly Elpeleg
BACKGROUND: The underlying molecular aetiology of congenital heart defects is largely unknown. The aim of this study was to explore the genetic basis of non-syndromic severe congenital valve malformations in two unrelated families. METHODS: Whole-exome analysis was used to identify the mutations in five patients who suffered from severe valvular malformations involving the pulmonic, tricuspid and mitral valves. The significance of the findings was assessed by studying sporulation of yeast carrying a homologous Phospholipase D (PLD1) mutation, in situ hybridisation in chick embryo and echocardiography and histological examination of hearts of PLD1 knockout mice...
October 31, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27794048/the-impact-of-a-panel-of-18-snps-on-breast-cancer-risk-in-women-attending-a-uk-familial-screening-clinic-a-case-control-study
#13
D Gareth Evans, Adam Brentnall, Helen Byers, Elaine Harkness, Paula Stavrinos, Anthony Howell, William G Newman, Jack Cuzick
BACKGROUND: Breast cancer familial risk clinics offer screening and preventive strategies. While BRCA1/BRCA2 genetic testing provides important risk information for some women, panels of more common breast cancer risk genetic variants may have relevance to greater numbers of women with familial risk. METHODS: Three polygenic risk scores (PRS) based on 18 SNPs were investigated in a case-control study of women attending a familial risk clinic. PRS were derived from published general European population allele ORs and frequencies (18-SNPs (SNP18))...
October 28, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27789573/a-de-novo-missense-mutation-of-gabrb2-causes-early-myoclonic-encephalopathy
#14
Atsushi Ishii, Jing-Qiong Kang, Cara C Schornak, Ciria C Hernandez, Wangzhen Shen, Joseph C Watkins, Robert L Macdonald, Shinichi Hirose
BACKGROUND: Early myoclonic encephalopathy (EME), a disease with a devastating prognosis, is characterised by neonatal onset of seizures and massive myoclonus accompanied by a continuous suppression-burst EEG pattern. Three genes are associated with EMEs that have metabolic features. Here, we report a pathogenic mutation of an ion channel as a cause of EME for the first time. METHODS: Sequencing was performed for 214 patients with epileptic seizures using a gene panel with 109 genes that are known or suspected to cause epileptic seizures...
October 27, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27738188/genotype-phenotype-correlation-and-functional-studies-in-patients-with-cystic-fibrosis-bearing-cftr-complex-alleles
#15
Vito Terlizzi, Giuseppe Castaldo, Donatello Salvatore, Marco Lucarelli, Valeria Raia, Adriano Angioni, Vincenzo Carnovale, Natalia Cirilli, Rosaria Casciaro, Carla Colombo, Antonella Miriam Di Lullo, Ausilia Elce, Paola Iacotucci, Marika Comegna, Manuela Scorza, Vincenzina Lucidi, Anna Perfetti, Roberta Cimino, Serena Quattrucci, Manuela Seia, Valentina Maria Sofia, Federica Zarrilli, Felice Amato
BACKGROUND: The effect of complex alleles in cystic fibrosis (CF) is poorly defined for the lack of functional studies. OBJECTIVES: To describe the genotype-phenotype correlation and the results of either in vitro and ex vivo studies performed on nasal epithelial cells (NEC) in a cohort of patients with CF carrying cystic fibrosis transmembrane conductance regulator (CFTR) complex alleles. METHODS: We studied 70 homozygous, compound heterozygous or heterozygous for CFTR mutations: p...
October 13, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27738187/chitayat-syndrome-hyperphalangism-characteristic-facies-hallux-valgus-and-bronchomalacia-results-from-a-recurrent-c-266a-g-p-tyr89cys-variant-in-the-erf-gene
#16
M Balasubramanian, H Lord, S Levesque, H Guturu, F Thuriot, G Sillon, A M Wenger, D L Sureka, T Lester, D S Johnson, J Bowen, A R Calhoun, D H Viskochil, G Bejerano, J A Bernstein, D Chitayat
BACKGROUND: In 1993, Chitayat et al., reported a newborn with hyperphalangism, facial anomalies, and bronchomalacia. We identified three additional families with similar findings. Features include bilateral accessory phalanx resulting in shortened index fingers; hallux valgus; distinctive face; respiratory compromise. OBJECTIVES: To identify the genetic aetiology of Chitayat syndrome and identify a unifying cause for this specific form of hyperphalangism. METHODS: Through ongoing collaboration, we had collected patients with strikingly-similar phenotype...
October 13, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27738186/erratum-the-kinetochore-protein-cenpf-is-mutated-in-human-ciliopathy-and-microcephaly-phenotypes
#17
(no author information available yet)
No abstract text is available yet for this article.
October 13, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27707803/a-novel-trappc11-mutation-in-two-turkish-families-associated-with-cerebral-atrophy-global-retardation-scoliosis-achalasia-and-alacrima
#18
Katrin Koehler, Miroslav P Milev, Keshika Prematilake, Felix Reschke, Susann Kutzner, Ramona Jühlen, Dana Landgraf, Eda Utine, Filiz Hazan, Gulden Diniz, Markus Schuelke, Angela Huebner, Michael Sacher
BACKGROUND: Triple A syndrome (MIM #231550) is associated with mutations in the AAAS gene. However, about 30% of patients with triple A syndrome symptoms but an unresolved diagnosis do not harbour mutations in AAAS. OBJECTIVE: Search for novel genetic defects in families with a triple A-like phenotype in whom AAAS mutations are not detected. METHODS: Genome-wide linkage analysis, whole-exome sequencing and functional analyses were used to discover and verify a novel genetic defect in two families with achalasia, alacrima, myopathy and further symptoms...
October 5, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27694521/mutations-in-the-phosphatidylinositol-glycan-c-pigc-gene-are-associated-with-epilepsy-and-intellectual-disability
#19
Simon Edvardson, Yoshiko Murakami, Thi Tuyet Mai Nguyen, Maher Shahrour, Anik St-Denis, Avraham Shaag, Nadira Damseh, Françoise Le Deist, Yenan Bryceson, Bassam Abu-Libdeh, Philippe M Campeau, Taroh Kinoshita, Orly Elpeleg
BACKGROUND: Of our 1400 exome-studied patients, 67% originate from consanguineous families. ∼80% suffer from variable degree of intellectual disability (ID). The search for disease causing genes using homozygosity mapping was progressing slowly until 2010, then markedly accelerated by the introduction of exome analysis. OBJECTIVES: To identify the disease causing mutation(s) in three patients from two unrelated families who suffered from global developmental delay, severe ID and drug-responsive seizure disorder...
September 30, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27683825/coa7-c1orf163-resa1-mutations-associated-with-mitochondrial-leukoencephalopathy-and-cytochrome-c-oxidase-deficiency
#20
Anabel Martinez Lyons, Anna Ardissone, Aurelio Reyes, Alan J Robinson, Isabella Moroni, Daniele Ghezzi, Erika Fernandez-Vizarra, Massimo Zeviani
BACKGROUND: Assembly of cytochrome c oxidase (COX, complex IV, cIV), the terminal component of the mitochondrial respiratory chain, is assisted by several factors, most of which are conserved from yeast to humans. However, some of them, including COA7, are found in humans but not in yeast. COA7 is a 231aa-long mitochondrial protein present in animals, containing five Sel1-like tetratricopeptide repeat sequences, which are likely to interact with partner proteins. METHODS: Whole exome sequencing was carried out on a 19 year old woman, affected by early onset, progressive severe ataxia and peripheral neuropathy, mild cognitive impairment and a cavitating leukodystrophy of the brain with spinal cord hypotrophy...
September 28, 2016: Journal of Medical Genetics
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