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Journal of Medical Genetics

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https://www.readbyqxmd.com/read/28143899/a-missense-mutation-in-the-crbn-gene-that-segregates-with-intellectual-disability-and-self-mutilating-behaviour-in-a-consanguineous-saudi-family
#1
Atia Sheereen, Manal Alaamery, Shahad Bawazeer, Yusra Al Yafee, Salam Massadeh, Wafaa Eyaid
BACKGROUND: Autosomal-recessive non-syndromic intellectual disability (ARNS-ID) is an aetiologically heterogeneous disorder. Although little is known about the function of human cereblon (CRBN), its relationship to mild cognitive deficits suggests that it is involved in the basic processes of human memory and learning. OBJECTIVES: We aim to identify the genetic cause of intellectual disability and self-mutilation in a consanguineous Saudi family with five affected members...
January 31, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28119487/stag1-mutations-cause-a-novel-cohesinopathy-characterised-by-unspecific-syndromic-intellectual-disability
#2
Daphné Lehalle, Anne-Laure Mosca-Boidron, Amber Begtrup, Odile Boute-Benejean, Perrine Charles, Megan T Cho, Amanda Clarkson, Orrin Devinsky, Yannis Duffourd, Laurence Duplomb-Jego, Bénédicte Gérard, Aurélia Jacquette, Paul Kuentz, Alice Masurel-Paulet, Carey McDougall, Sébastien Moutton, Hilde Olivié, Soo-Mi Park, Anita Rauch, Nicole Revencu, Jean-Baptiste Rivière, Karol Rubin, Ingrid Simonic, Deborah J Shears, Thomas Smol, Ana Lisa Taylor Tavares, Paulien Terhal, Julien Thevenon, Koen Van Gassen, Catherine Vincent-Delorme, Marjolein H Willemsen, Golder N Wilson, Elaine Zackai, Christiane Zweier, Patrick Callier, Christel Thauvin-Robinet, Laurence Faivre
BACKGROUND: Cohesinopathies are rare neurodevelopmental disorders arising from a dysfunction in the cohesin pathway, which enables chromosome segregation and regulates gene transcription. So far, eight genes from this pathway have been reported in human disease. STAG1 belongs to the STAG subunit of the core cohesin complex, along with five other subunits. This work aimed to identify the phenotype ascribed to STAG1 mutations. METHODS: Among patients referred for intellectual disability (ID) in genetics departments worldwide, array-comparative genomic hybridisation (CGH), gene panel, whole-exome sequencing or whole-genome sequencing were performed following the local diagnostic standards...
January 24, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28100473/delineating-the-phenotypic-spectrum-of-bainbridge-ropers-syndrome-12-new-patients-with-de-novo-heterozygous-loss-of-function-mutations-in-asxl3-and-review-of-published-literature
#3
M Balasubramanian, J Willoughby, A E Fry, A Weber, H V Firth, C Deshpande, J N Berg, K Chandler, K A Metcalfe, W Lam, D Pilz, S Tomkins
BACKGROUND: Bainbridge-Ropers syndrome (BRPS) is a recently described developmental disorder caused by de novo truncating mutations in the additional sex combs like 3 (ASXL3) gene. To date, there have been fewer than 10 reported patients. OBJECTIVES: Here, we delineate the BRPS phenotype further by describing a series of 12 previously unreported patients identified by the Deciphering Developmental Disorders study. METHODS: Trio-based exome sequencing was performed on all 12 patients included in this study, which found a de novo truncating mutation in ASXL3...
January 18, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28096187/gprasp2-a-novel-causative-gene-mutated-in-an-x-linked-recessive-syndromic-hearing-loss
#4
Guangqian Xing, Jun Yao, Chunyu Liu, Qinjun Wei, Xuli Qian, Lingxin Wu, Yajie Lu, Xin Cao
BACKGROUND: A substantial amount of nuclear genes have been identified to be implicated in genetic hearing loss, while X-linked hearing loss is genetically heterogeneous and relatively infrequent. OBJECTIVE: To identify the causative gene mutation in a five-generation Chinese family with an X-linked recessive syndromic hearing loss (SHL). METHODS: Targeted X-chromosome exome sequencing was conducted, and cosegregation analysis was performed in the members of the affected family...
January 17, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28087721/joubert-syndrome-neuroimaging-findings-in-110-patients-in-correlation-with-cognitive-function-and-genetic-cause
#5
Andrea Poretti, Joseph Snow, Angela C Summers, Aylin Tekes, Thierry A G M Huisman, Nafi Aygun, Kathryn A Carson, Dan Doherty, Melissa A Parisi, Camilo Toro, Deniz Yildirimli, Meghana Vemulapalli, Jim C Mullikin, Andrew R Cullinane, Thierry Vilboux, William A Gahl, Meral Gunay-Aygun
BACKGROUND: Joubert syndrome is a clinically and genetically heterogeneous ciliopathy. Neuroimaging findings have not been systematically evaluated in a large cohort of patients with Joubert syndrome in correlation with molecular genetic cause and cognitive function. METHODS: Brain MRI of 110 patients with Joubert syndrome was included in this study. A comprehensive evaluation of brain MRI studies for infratentorial and supratentorial morphological abnormalities was performed...
January 13, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28087720/a-liminal-stage-after-predictive-testing-for-huntington-disease
#6
Marcela Gargiulo, Sophie Tezenas du Montcel, Marie France Jutras, Ariane Herson, Cecile Cazeneuve, Alexandra Durr
BACKGROUND: Following predictive testing for Huntington disease (HD), knowledge of one's carrier status may have consequences on disease onset. Our study aimed to address two questions. First, does knowledge of being a carrier of the pathological HD mutation trigger onset of the disease? Second, does this knowledge influence self-awareness and allow carriers to identify signs and symptoms of disease onset? METHODS: Between 2012 and 2015, 75 HD mutation carriers were examined using the Unified Huntington's Disease Rating Scale (UHDRS) motor score...
January 13, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28087719/genetics-insight-into-the-amyotrophic-lateral-sclerosis-frontotemporal-dementia-spectrum
#7
REVIEW
Ai-Ling Ji, Xia Zhang, Wei-Wei Chen, Wen-Juan Huang
Recent genetic discoveries have dramatically changed our understanding of two major neurodegenerative conditions. Amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) are common, devastating diseases of the brain. For decades, ALS and FTD were classified as movement and cognitive disorders, respectively, due to their distinct clinical phenotypes. The recent identification of chromosome 9 open reading frame 72 (C9orf72) as the major gene causative of familial forms of ALS and FTD uncovered a new reality of a continuous FTD/ALS spectrum...
January 13, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28069933/no-correlation-between-mtdna-amount-and-methylation-levels-at-the-cpg-island-of-polg-exon-2-in-wild-type-and-mutant-human-differentiated-cells
#8
Julie Steffann, Aurore Pouliet, Houda Adjal, Christine Bole, Cécile Fourrage, Jelena Martinovic, Louise Rolland-Galmiche, Agnes Rotig, Frédéric Tores, Arnold Munnich, Jean-Paul Bonnefont
BACKGROUND: While mitochondrial DNA (mtDNA) copy number is strictly regulated during differentiation and according to cell type, very little is known regarding the mechanism which accurately controls mtDNA copy number in human. Exon 2 of the human POLG gene, encoding the catalytic subunit of the mitochondrial-specific DNA polymerase gamma, contains a CpG island, highly conserved in mice and human. Changes of DNA methylation at the POLG locus have been shown to modulate mtDNA copy number during cell differentiation in both mouse and human...
January 9, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28039329/a-genome-wide-interaction-analysis-of-tricyclic-tetracyclic-antidepressants-and-rr-and-qt-intervals-a-pharmacogenomics-study-from-the-cohorts-for-heart-and-aging-research-in-genomic-epidemiology-charge-consortium
#9
Raymond Noordam, Colleen M Sitlani, Christy L Avery, James D Stewart, Stephanie M Gogarten, Kerri L Wiggins, Stella Trompet, Helen R Warren, Fangui Sun, Daniel S Evans, Xiaohui Li, Jin Li, Albert V Smith, Joshua C Bis, Jennifer A Brody, Evan L Busch, Mark J Caulfield, Yii-Der I Chen, Steven R Cummings, L Adrienne Cupples, Qing Duan, Oscar H Franco, Rául Méndez-Giráldez, Tamara B Harris, Susan R Heckbert, Diana van Heemst, Albert Hofman, James S Floyd, Jan A Kors, Lenore J Launer, Yun Li, Ruifang Li-Gao, Leslie A Lange, Henry J Lin, Renée de Mutsert, Melanie D Napier, Christopher Newton-Cheh, Neil Poulter, Alexander P Reiner, Kenneth M Rice, Jeffrey Roach, Carlos J Rodriguez, Frits R Rosendaal, Naveed Sattar, Peter Sever, Amanda A Seyerle, P Eline Slagboom, Elsayed Z Soliman, Nona Sotoodehnia, David J Stott, Til Stürmer, Kent D Taylor, Timothy A Thornton, André G Uitterlinden, Kirk C Wilhelmsen, James G Wilson, Vilmundur Gudnason, J Wouter Jukema, Cathy C Laurie, Yongmei Liu, Dennis O Mook-Kanamori, Patricia B Munroe, Jerome I Rotter, Ramachandran S Vasan, Bruce M Psaty, Bruno H Stricker, Eric A Whitsel
BACKGROUND: Increased heart rate and a prolonged QT interval are important risk factors for cardiovascular morbidity and mortality, and can be influenced by the use of various medications, including tricyclic/tetracyclic antidepressants (TCAs). We aim to identify genetic loci that modify the association between TCA use and RR and QT intervals. METHODS AND RESULTS: We conducted race/ethnic-specific genome-wide interaction analyses (with HapMap phase II imputed reference panel imputation) of TCAs and resting RR and QT intervals in cohorts of European (n=45 706; n=1417 TCA users), African (n=10 235; n=296 TCA users) and Hispanic/Latino (n=13 808; n=147 TCA users) ancestry, adjusted for clinical covariates...
December 30, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28039328/outcome-of-24%C3%A2-years-national-surveillance-in-different-hereditary-colorectal-cancer-subgroups-leading-to-more-individualised-surveillance
#10
Lars Joachim Lindberg, Steen Ladelund, Birgitte Lidegaard Frederiksen, Lars Smith-Hansen, Inge Bernstein
BACKGROUND: Individuals with hereditary non-polyposis colorectal cancer (HNPCC) have a high risk of colorectal cancer (CRC). The benefits of colonic surveillance in Lynch syndrome and Amsterdam-positive (familial CRC type X familial colorectal cancer type X (FCCTX)) families are clear; only the interval between colonoscopies is debated. The potential benefits for families not fulfilling the Amsterdam criteria are uncertain. The aim of this study was to compare the outcome of colonic surveillance in different hereditary subgroups and to evaluate the surveillance programmes...
December 30, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28031252/compound-heterozygosity-for-severe-and-hypomorphic-ndufs2-mutations-cause-non-syndromic-lhon-like-optic-neuropathy
#11
Sylvie Gerber, Martina G Ding, Xavier Gérard, Klaus Zwicker, Xavier Zanlonghi, Marlène Rio, Valérie Serre, Sylvain Hanein, Arnold Munnich, Agnès Rotig, Lucas Bianchi, Patrizia Amati-Bonneau, Orly Elpeleg, Josseline Kaplan, Ulrich Brandt, Jean-Michel Rozet
BACKGROUND: Non-syndromic hereditary optic neuropathy (HON) has been ascribed to mutations in mitochondrial fusion/fission dynamics genes, nuclear and mitochondrial DNA-encoded respiratory enzyme genes or nuclear genes of poorly known mitochondrial function. However, the disease causing gene remains unknown in many families. The objective of the present study was to identify the molecular cause of non-syndromic LHON-like disease in siblings born to non-consanguineous parents of French origin...
December 28, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28007939/single-synonymous-mutation-in-factor-ix-alters-protein-properties-and-underlies-haemophilia-b
#12
Vijaya L Simhadri, Nobuko Hamasaki-Katagiri, Brian C Lin, Ryan Hunt, Sujata Jha, Sandra C Tseng, Andrew Wu, Amber A Bentley, Ran Zichel, Qi Lu, Lily Zhu, Darón I Freedberg, Dougald M Monroe, Zuben E Sauna, Robert Peters, Anton A Komar, Chava Kimchi-Sarfaty
BACKGROUND: Haemophilia B is caused by genetic aberrations in the F9 gene. The majority of these are non-synonymous mutations that alter the primary structure of blood coagulation factor IX (FIX). However, a synonymous mutation c.459G>A (Val107Val) was clinically reported to result in mild haemophilia B (FIX coagulant activity 15%-20% of normal). The F9 mRNA of these patients showed no skipping or retention of introns and/or change in mRNA levels, suggesting that mRNA integrity does not contribute to the origin of the disease in affected individuals...
December 22, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28003323/precise-long-non-coding-rna-modulation-in-visual-maintenance-and-impairment
#13
REVIEW
Peixing Wan, Wenru Su, Yehong Zhuo
Long non-coding RNAs (lncRNAs) are remarkably powerful, flexible and pervasive cellular regulators. With the help of cheaper RNA-seq, high-throughput screening of lncRNAs has become widely applied and has identified large numbers of specific lncRNAs in various physiological or pathological processes. Vision is known to be a complex and vital perception that comprises 80% of the sensory information we receive. A consensus has been reached that normal visual maintenance and impairment are primarily driven by gene regulation...
December 21, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27986801/decreased-telomere-length-in-children-with-cartilage-hair-hypoplasia
#14
Svetlana Kostjukovits, Sofie Degerman, Minna Pekkinen, Paula Klemetti, Mattias Landfors, Göran Roos, Mervi Taskinen, Outi Mäkitie
BACKGROUND: Cartilage-hair hypoplasia (CHH) is an autosomal recessive chondrodysplasia caused by RMRP (RNA component of mitochondrial RNA processing endoribonuclease) gene mutations. Manifestations include short stature, variable immunodeficiency, anaemia and increased risk of malignancies, all of which have been described also in telomere biology disorders. RMRP interacts with the telomerase RT (TERT) subunit, but the influence of RMRP mutations on telomere length is unknown. We measured relative telomere length (RTL) in patients with CHH, their first-degree relatives and healthy controls and correlated RTL with clinical and laboratory features...
December 16, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27965375/recessive-progressive-symmetric-erythrokeratoderma-results-from-a-homozygous-loss-of-function-mutation-of-krt83-and-is-allelic-with-dominant-monilethrix
#15
Khadim Shah, Muhammad Ansar, Zaib-Un-Nisa Mughal, Falak Sher Khan, Wasim Ahmad, Tracey M Ferrara, Richard A Spritz
BACKGROUND: Progressive symmetric erythrokeratoderma (PSEK) is a rare skin disorder characterised by symmetrically distributed demarcated hyperkeratotic plaques, often with associated palmoplantar hyperkeratosis, with new plaques appearing over time. Most cases are inherited in an autosomal dominant manner, although a few cases exhibit apparent autosomal recessive inheritance. OBJECTIVE: To identify the gene underlying autosomal recessive PSEK in a large Pakistani kindred...
December 13, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27941131/genome-wide-association-study-identifies-variants-in-hormad2-associated-with-tonsillectomy
#16
Bjarke Feenstra, Peter Bager, Xueping Liu, Henrik Hjalgrim, Ellen A Nohr, David M Hougaard, Frank Geller, Mads Melbye
BACKGROUND: Inflammation of the tonsils is a normal response to infection, but some individuals experience recurrent, severe tonsillitis and massive hypertrophy of the tonsils in which case surgical removal of the tonsils may be considered. OBJECTIVE: To identify common genetic variants associated with tonsillectomy. METHODS: We used tonsillectomy information from Danish health registers and carried out a genome-wide association study comprising 1464 patients and 12 019 controls of Northwestern European ancestry, with replication in an independent sample set of 1575 patients and 1367 controls...
December 9, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27920058/a-novel-somatic-mutation-achieves-partial-rescue-in-a-child-with-hutchinson-gilford-progeria-syndrome
#17
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
#18
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
#19
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
#20
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
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