1
|
Lamont R, King M, King A, Schellenberg K, Pfeffer G. Higher than expected incident cases of spinal bulbar muscular atrophy in western Canada. Brain 2024; 147:e43-e44. [PMID: 38366260 PMCID: PMC11068102 DOI: 10.1093/brain/awae052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 01/15/2024] [Accepted: 02/10/2024] [Indexed: 02/18/2024] Open
Affiliation(s)
- Ryan Lamont
- Department of Medical Genetics, University of Calgary, Calgary, AB, T2N 4N1, Canada
| | - Malcolm King
- College of Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5E5, Canada
- Mississaugas of the Credit First Nation, ON, Canada
| | - Alexandra King
- College of Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5E5, Canada
- Nipissing First Nation, ON, Canada
| | - Kerri Schellenberg
- College of Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5E5, Canada
| | - Gerald Pfeffer
- Department of Medical Genetics, University of Calgary, Calgary, AB, T2N 4N1, Canada
- Hotchkiss Brain Institute, Cumming School of Medicine, Department of Clinical Neurosciences, University of Calgary, Calgary, AN, T2N 4N1, Canada
| |
Collapse
|
2
|
Lecoquierre F, Punt AM, Ebstein F, Wallaard I, Verhagen R, Studencka-Turski M, Duffourd Y, Moutton S, Tran Mau-Them F, Philippe C, Dean J, Tennant S, Brooks AS, van Slegtenhorst MA, Jurgens JA, Barry BJ, Chan WM, England EM, Martinez Ojeda M, Engle EC, Robson CD, Morrow M, Innes AM, Lamont R, Sanderson M, Krüger E, Thauvin C, Distel B, Faivre L, Elgersma Y, Vitobello A. A recurrent missense variant in the E3 ubiquitin ligase substrate recognition subunit FEM1B causes a rare syndromic neurodevelopmental disorder. Genet Med 2024; 26:101119. [PMID: 38465576 DOI: 10.1016/j.gim.2024.101119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 03/04/2024] [Accepted: 03/05/2024] [Indexed: 03/12/2024] Open
Abstract
PURPOSE Fem1 homolog B (FEM1B) acts as a substrate recognition subunit for ubiquitin ligase complexes belonging to the CULLIN 2-based E3 family. Several biological functions have been proposed for FEM1B, including a structurally resolved function as a sensor for redox cell status by controlling mitochondrial activity, but its implication in human disease remains elusive. METHODS To understand the involvement of FEM1B in human disease, we made use of Matchmaker exchange platforms to identify individuals with de novo variants in FEM1B and performed their clinical evaluation. We performed functional validation using primary neuronal cultures and in utero electroporation assays, as well as experiments on patient's cells. RESULTS Five individuals with a recurrent de novo missense variant in FEM1B were identified: NM_015322.5:c.377G>A NP_056137.1:p.(Arg126Gln) (FEM1BR126Q). Affected individuals shared a severe neurodevelopmental disorder with behavioral phenotypes and a variable set of malformations, including brain anomalies, clubfeet, skeletal abnormalities, and facial dysmorphism. Overexpression of the FEM1BR126Q variant but not FEM1B wild-type protein, during mouse brain development, resulted in delayed neuronal migration of the target cells. In addition, the individuals' cells exhibited signs of oxidative stress and induction of type I interferon signaling. CONCLUSION Overall, our data indicate that p.(Arg126Gln) induces aberrant FEM1B activation, resulting in a gain-of-function mechanism associated with a severe syndromic developmental disorder in humans.
Collapse
Affiliation(s)
- François Lecoquierre
- Univ Rouen Normandie, Inserm U1245 and CHU Rouen, Department of Genetics and reference center for developmental disorders, Rouen, France; UMR1231 GAD, Inserm, Université Bourgogne-Franche Comté, Dijon, France.
| | - A Mattijs Punt
- Department of Clinical Genetics, Erasmus MC, Rotterdam, The Netherlands; ENCORE Expertise Center for Neurodevelopmental Disorders, Erasmus MC, Rotterdam, The Netherlands
| | - Frédéric Ebstein
- Institut für Medizinische Biochemie und Molekularbiologie (IMBM), Universitätsmedizin Greifswald, Greifswald, Germany; Nantes Université, INSERM, CNRS, l'institut du thorax, Nantes Cedex 1, France
| | - Ilse Wallaard
- Department of Clinical Genetics, Erasmus MC, Rotterdam, The Netherlands; ENCORE Expertise Center for Neurodevelopmental Disorders, Erasmus MC, Rotterdam, The Netherlands
| | - Rob Verhagen
- Department of Clinical Genetics, Erasmus MC, Rotterdam, The Netherlands; ENCORE Expertise Center for Neurodevelopmental Disorders, Erasmus MC, Rotterdam, The Netherlands
| | - Maja Studencka-Turski
- Institut für Medizinische Biochemie und Molekularbiologie (IMBM), Universitätsmedizin Greifswald, Greifswald, Germany
| | - Yannis Duffourd
- UMR1231 GAD, Inserm, Université Bourgogne-Franche Comté, Dijon, France
| | - Sébastien Moutton
- UMR1231 GAD, Inserm, Université Bourgogne-Franche Comté, Dijon, France
| | - Frédédic Tran Mau-Them
- UMR1231 GAD, Inserm, Université Bourgogne-Franche Comté, Dijon, France; Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, Fédération Hospitalo-Universitaire-TRANSLAD, CHU Dijon Bourgogne, Dijon, France
| | - Christophe Philippe
- UMR1231 GAD, Inserm, Université Bourgogne-Franche Comté, Dijon, France; Laboratoire de Génétique, CHR Metz-Thionville, Hôpital Mercy, Metz, France
| | - John Dean
- Department of Medical Genetics, NHS Grampian, Aberdeen, United Kingdom
| | - Stephen Tennant
- NHS Grampian, Genetics & Molecular Pathology Laboratory Services, Aberdeen, United Kingdom
| | - Alice S Brooks
- Department of Clinical Genetics, Erasmus MC, Rotterdam, The Netherlands
| | | | - Julie A Jurgens
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, Boston, MA; Department of Neurology, Boston Children's Hospital, Boston, MA; Department of Neurology, Harvard Medical School, Boston, MA; Broad Institute of MIT and Harvard, Cambridge, MA
| | - Brenda J Barry
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, Boston, MA; Department of Neurology, Boston Children's Hospital, Boston, MA; Howard Hughes Medical Institute, Chevy Chase, MD
| | - Wai-Man Chan
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, Boston, MA; Department of Neurology, Boston Children's Hospital, Boston, MA; Department of Neurology, Harvard Medical School, Boston, MA; Broad Institute of MIT and Harvard, Cambridge, MA; Howard Hughes Medical Institute, Chevy Chase, MD
| | - Eleina M England
- Center for Mendelian Genomics, Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, MA; Analytic and Translational Genetics Unit, Massachusetts General Hospital, Boston, MA; Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA
| | | | - Elizabeth C Engle
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, Boston, MA; Department of Neurology, Boston Children's Hospital, Boston, MA; Department of Neurology, Harvard Medical School, Boston, MA; Broad Institute of MIT and Harvard, Cambridge, MA; Howard Hughes Medical Institute, Chevy Chase, MD; Department of Ophthalmology, Boston Children's Hospital and Harvard Medical School, Boston, MA
| | - Caroline D Robson
- Division of Neuroradiology, Department of Radiology, Boston Children's Hospital, Boston, MA; Department of Radiology, Harvard Medical School, Boston, MA
| | | | - A Micheil Innes
- Alberta Children's Hospital Research Institute for Child and Maternal Health and Department of Medical Genetics, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Ryan Lamont
- Alberta Children's Hospital Research Institute for Child and Maternal Health and Department of Medical Genetics, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Matthea Sanderson
- Department of Medical Genetics, University of Alberta, Edmonton, AB, Canada
| | - Elke Krüger
- Institut für Medizinische Biochemie und Molekularbiologie (IMBM), Universitätsmedizin Greifswald, Greifswald, Germany
| | - Christel Thauvin
- UMR1231 GAD, Inserm, Université Bourgogne-Franche Comté, Dijon, France; Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, Fédération Hospitalo-Universitaire-TRANSLAD, CHU Dijon Bourgogne, Dijon, France; Centre de référence maladies rares « Déficiences Intellectuelles de Causes Rares », Centre de Génétique, FHU-TRANSLAD, CHU Dijon Bourgogne, Dijon, France
| | - Ben Distel
- Department of Clinical Genetics, Erasmus MC, Rotterdam, The Netherlands; ENCORE Expertise Center for Neurodevelopmental Disorders, Erasmus MC, Rotterdam, The Netherlands
| | - Laurence Faivre
- UMR1231 GAD, Inserm, Université Bourgogne-Franche Comté, Dijon, France; Centre de Référence maladies rares « Anomalies du Développement et Syndromes Malformatifs », Centre de Génétique, FHU-TRANSLAD, CHU Dijon Bourgogne, Dijon, France
| | - Ype Elgersma
- Department of Clinical Genetics, Erasmus MC, Rotterdam, The Netherlands; ENCORE Expertise Center for Neurodevelopmental Disorders, Erasmus MC, Rotterdam, The Netherlands
| | - Antonio Vitobello
- UMR1231 GAD, Inserm, Université Bourgogne-Franche Comté, Dijon, France; Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, Fédération Hospitalo-Universitaire-TRANSLAD, CHU Dijon Bourgogne, Dijon, France
| |
Collapse
|
3
|
Eaton A, Hartley T, Kernohan K, Ito Y, Lamont R, Parboosingh J, Barrowman N, Innes AM, Boycott K. When to think outside the autozygome: Best practices for exome sequencing in "consanguineous" families. Clin Genet 2020; 97:835-843. [PMID: 32162313 DOI: 10.1111/cge.13736] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 02/15/2020] [Accepted: 03/09/2020] [Indexed: 12/14/2022]
Abstract
Exome sequencing (ES) is an effective diagnostic tool with a high yield in consanguineous families. However, how diagnostic yield and mode of inheritance relate to family structure has not been well delineated. We reviewed ES results from families enrolled in the Care4Rare Canada research consortium with various degrees of consanguinity. We contrasted the diagnostic yield in families with parents who are second cousins or closer ("close" consanguinity) vs those more distantly related or from isolated populations ("presumed" consanguinity). We further stratified by number of affected individuals (multiple affected ["multiplex"] vs single affected [simplex]). The overall yield in 116 families was 45.7% (n = 53) with no significant difference between subgroups. Homozygous variants accounted for 100% and 75% of diagnoses in close and presumed consanguineous multiplex families, respectively. In simplex presumed consanguineous families, a striking 46.2% of diagnoses were due to de novo variants, vs only 11.8% in simplex closely consanguineous families (88.2% homozygous). Our data underscores the high yield of ES in consanguineous families and highlights that while a singleton approach may frequently be reasonable and a responsible use of resources, trio sequencing should be strongly considered in simplex families in the absence of confirmed consanguinity given the proportion of de novo variants.
Collapse
Affiliation(s)
- Alison Eaton
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada
| | - Taila Hartley
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada
| | - Kristin Kernohan
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada.,Newborn Screening Ontario, Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada
| | - Yoko Ito
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada
| | - Ryan Lamont
- Alberta Children's Hospital Research Institute, Department of Medical Genetics, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Jillian Parboosingh
- Alberta Children's Hospital Research Institute, Department of Medical Genetics, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Nick Barrowman
- Clinical Research Unit, Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada
| | -
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada
| | - A Micheil Innes
- Alberta Children's Hospital Research Institute, Department of Medical Genetics, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Kym Boycott
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada
| |
Collapse
|
4
|
Yeates KO, Beauchamp M, Craig W, Doan Q, Zemek R, Bjornson BH, Gravel J, Mikrogianakis A, Goodyear B, Abdeen N, Beaulieu C, Dehaes M, Deschenes S, Harris A, Lebel C, Lamont R, Williamson T, Barlow KM, Bernier F, Brooks BL, Emery C, Freedman SB, Kowalski K, Mrklas K, Tomfohr-Madsen L, Schneider KJ. Advancing Concussion Assessment in Pediatrics (A-CAP): a prospective, concurrent cohort, longitudinal study of mild traumatic brain injury in children: protocol study. BMJ Open 2017; 7:e017012. [PMID: 28710227 PMCID: PMC5724225 DOI: 10.1136/bmjopen-2017-017012] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
INTRODUCTION Paediatric mild traumatic brain injury (mTBI) is a public health burden. Clinicians urgently need evidence-based guidance to manage mTBI, but gold standards for diagnosing and predicting the outcomes of mTBI are lacking. The objective of the Advancing Concussion Assessment in Pediatrics (A-CAP) study is to assess a broad pool of neurobiological and psychosocial markers to examine associations with postinjury outcomes in a large sample of children with either mTBI or orthopaedic injury (OI), with the goal of improving the diagnosis and prognostication of outcomes of paediatric mTBI. METHODS AND ANALYSIS A-CAP is a prospective, longitudinal cohort study of children aged 8.00-16.99 years with either mTBI or OI, recruited during acute emergency department (ED) visits at five sites from the Pediatric Emergency Research Canada network. Injury information is collected in the ED; follow-up assessments at 10 days and 3 and 6 months postinjury measure a variety of neurobiological and psychosocial markers, covariates/confounders and outcomes. Weekly postconcussive symptom ratings are obtained electronically. Recruitment began in September 2016 and will occur for approximately 24 months. Analyses will test the major hypotheses that neurobiological and psychosocial markers can: (1) differentiate mTBI from OI and (2) predict outcomes of mTBI. Models initially will focus within domains (eg, genes, imaging biomarkers, psychosocial markers), followed by multivariable modelling across domains. The planned sample size (700 mTBI, 300 OI) provides adequate statistical power and allows for internal cross-validation of some analyses. ETHICS AND DISSEMINATION The ethics boards at all participating institutions have approved the study and all participants and their parents will provide informed consent or assent. Dissemination will follow an integrated knowledge translation plan, with study findings presented at scientific conferences and in multiple manuscripts in peer-reviewed journals.
Collapse
Affiliation(s)
- Keith Owen Yeates
- Department of Psychology, University of Calgary, Calgary, Alberta, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
| | - Miriam Beauchamp
- Department of Psychology, Universite de Montreal and Ste Justine Hospital, Montreal, Québec, Canada
| | - William Craig
- Department of Pediatrics, University of Alberta and Stollery Children’s Hospital, Edmonton, Alberta, Canada
| | - Quynh Doan
- Department of Pediatrics, University of British Columbia and BC Children’s Hospital, Vancouver, British Columbia, Canada
| | - Roger Zemek
- Department of Pediatrics and Emergency Medicine, Children’s Hospital of Eastern Ontario, University of Ottawa, Ottawa, Ontario, Canada
| | - Bruce H Bjornson
- Department of Pediatrics, University of British Columbia and BC Children’s Hospital, Vancouver, British Columbia, Canada
| | - Jocelyn Gravel
- Department of Pediatrics, Universite de Montreal and Ste Justine Hospital, Montreal, Québec, Canada
| | - Angelo Mikrogianakis
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
| | - Bradley Goodyear
- Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
- Department of Radiology, University of Calgary, Calgary, Alberta, Canada
| | - Nishard Abdeen
- Department of Radiology, University of Ottawa and Children’s Hospital of Eastern Ontario, Ottawa, Ontario, Canada
| | - Christian Beaulieu
- Department of Biomedical Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Mathieu Dehaes
- Department of Radiology, Radiooncology and Nuclear Medicine, Université de Montréal and Ste Justine Hospital, Montreal, Québec, Canada
| | - Sylvain Deschenes
- Department of Radiology, Radiooncology and Nuclear Medicine, Université de Montréal and Ste Justine Hospital, Montreal, Québec, Canada
| | - Ashley Harris
- Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
- Department of Radiology, University of Calgary, Calgary, Alberta, Canada
| | - Catherine Lebel
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
- Department of Radiology, University of Calgary, Calgary, Alberta, Canada
| | - Ryan Lamont
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
- Department of Medical Genetics, University of Calgary and Alberta Children’s Hospital, Calgary, Alberta, Canada
| | - Tyler Williamson
- Department of Community Health Sciences, University of Calgary, Calgary, Alberta, Canada
| | - Karen Maria Barlow
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
- Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada
- Department of Pediatrics, University of Calgary and Alberta Children’s Hospital, Calgary, Alberta, Canada
| | - Francois Bernier
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
- Department of Medical Genetics, University of Calgary and Alberta Children’s Hospital, Calgary, Alberta, Canada
| | - Brian L Brooks
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
- Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada
- Department of Pediatrics, University of Calgary and Alberta Children’s Hospital, Calgary, Alberta, Canada
| | - Carolyn Emery
- Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
- Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
| | - Stephen B Freedman
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
- Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada
| | - Kristina Kowalski
- Department of Psychology, University of Calgary, Calgary, Alberta, Canada
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
| | - Kelly Mrklas
- Research Innovation and Analytics, Alberta Health Services, Calgary, Alberta, Canada
| | - Lianne Tomfohr-Madsen
- Department of Psychology, University of Calgary, Calgary, Alberta, Canada
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
| | - Kathryn J Schneider
- Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
- Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
| |
Collapse
|
5
|
Clare L, Nelis S, Wu Y, Martyr A, Knapp M, Henderson C, Lamont R, Matthews F. IMPROVING THE EXPERIENCE OF DEMENTIA AND ENHANCING ACTIVE LIFE (THE IDEAL STUDY): COHORT PROFILE. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.4934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- L. Clare
- University of Exeter, Exeter, United Kingdom,
| | - S. Nelis
- University of Exeter, Exeter, United Kingdom,
| | - Y. Wu
- University of Exeter, Exeter, United Kingdom,
| | - A. Martyr
- University of Exeter, Exeter, United Kingdom,
| | - M. Knapp
- London School of Economics, London, United Kingdom,
| | - C. Henderson
- London School of Economics, London, United Kingdom,
| | - R. Lamont
- University of Exeter, Exeter, United Kingdom,
| | - F. Matthews
- Newcastle University, England, United Kingdom
| |
Collapse
|
6
|
Xi Y, Parboosingh J, Johnson H, Graham L, Lamont R. MG-125 CYP21A2 mutation spectrum in congenital adrenal hyperplasia identified from molecular genetic testing. J Med Genet 2015. [DOI: 10.1136/jmedgenet-2015-103578.25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
7
|
Shamseldin H, Alazami A, Manning M, Hashem A, Caluseiu O, Tabarki B, Esplin E, Schelley S, Innes A, Parboosingh J, Lamont R, Majewski J, Bernier F, Alkuraya F, Alkuraya FS. RTTN Mutations Cause Primary Microcephaly and Primordial Dwarfism in Humans. Am J Hum Genet 2015; 97:862-8. [PMID: 26608784 DOI: 10.1016/j.ajhg.2015.10.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Accepted: 10/20/2015] [Indexed: 10/22/2022] Open
Abstract
Primary microcephaly is a developmental brain anomaly that results from defective proliferation of neuroprogenitors in the germinal periventricular zone. More than a dozen genes are known to be mutated in autosomal-recessive primary microcephaly in isolation or in association with a more generalized growth deficiency (microcephalic primordial dwarfism), but the genetic heterogeneity is probably more extensive. In a research protocol involving autozygome mapping and exome sequencing, we recruited a multiplex consanguineous family who is affected by severe microcephalic primordial dwarfism and tested negative on clinical exome sequencing. Two candidate autozygous intervals were identified, and the second round of exome sequencing revealed a single intronic variant therein (c.2885+8A>G [p.Ser963(∗)] in RTTN exon 23). RT-PCR confirmed that this change creates a cryptic splice donor and thus causes retention of the intervening 7 bp of the intron and leads to premature truncation. On the basis of this finding, we reanalyzed the exome file of a second consanguineous family affected by a similar phenotype and identified another homozygous change in RTTN as the likely causal mutation. Combined linkage analysis of the two families confirmed that RTTN maps to the only significant linkage peak. Finally, through international collaboration, a Canadian multiplex family affected by microcephalic primordial dwarfism and biallelic mutation of RTTN was identified. Our results expand the phenotype of RTTN-related disorders, hitherto limited to polymicrogyria, to include microcephalic primordial dwarfism with a complex brain phenotype involving simplified gyration.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh 11211, Saudi Arabia; Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh 11533, Saudi Arabia.
| |
Collapse
|
8
|
Hillier SL, Rabe LK, Beamer MA, Stoner K, Austin M, Petrina M, Crowe DS, Chaiworapongsa T, Lamont R, Ahmed A, Hassan S, Romero R. O13.1 The broad diversity of cultivable microbiota in pregnant women and the detection of novel organisms. Br J Vener Dis 2015. [DOI: 10.1136/sextrans-2015-052270.147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
9
|
Caluseriu O, Lowry BR, McLeod R, Lamont R, Parboosingh JS, Bernier FP, Innes AM. The hutterite variant of treacher collins syndrome: A 28-year-old story solved. Am J Med Genet A 2013; 161A:2855-9. [DOI: 10.1002/ajmg.a.36172] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Accepted: 07/17/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Oana Caluseriu
- Department of Medical Genetics; University of Calgary; Calgary AB Canada
- Department of Medical Genetics; University of Alberta; Edmonton AB Canada
| | - Brian R. Lowry
- Department of Medical Genetics; University of Calgary; Calgary AB Canada
- Alberta Children's Hospital Research Institute; Calgary AB Canada
- Department of Pediatrics; University of Calgary; Calgary AB Canada
| | - Ross McLeod
- Department of Medical Genetics; University of Calgary; Calgary AB Canada
- Department of Pediatrics; University of Calgary; Calgary AB Canada
| | - Ryan Lamont
- Department of Medical Genetics; University of Calgary; Calgary AB Canada
- Genetic Laboratory Services; Alberta Health Services; Calgary AB Canada
| | - Jillian S. Parboosingh
- Department of Medical Genetics; University of Calgary; Calgary AB Canada
- Alberta Children's Hospital Research Institute; Calgary AB Canada
- Genetic Laboratory Services; Alberta Health Services; Calgary AB Canada
| | - Francois P. Bernier
- Department of Medical Genetics; University of Calgary; Calgary AB Canada
- Alberta Children's Hospital Research Institute; Calgary AB Canada
| | - A. Micheil Innes
- Department of Medical Genetics; University of Calgary; Calgary AB Canada
- Alberta Children's Hospital Research Institute; Calgary AB Canada
| |
Collapse
|
10
|
Gordon PMK, Dimnik L, Lamont R, Innes M, Bernier F, Parboosingh J. Optimizing genotype quality metrics for individual exomes and cohort analysis. BMC Proc 2012. [PMCID: PMC3467544 DOI: 10.1186/1753-6561-6-s6-p42] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
11
|
|
12
|
Geary M, Gibson P, Wilkins R, Lamont R. Novel treatment of extensive thrombo-embolic disease in pregnancy with a temporary vena cava filter. J OBSTET GYNAECOL 2009; 17:282-3. [PMID: 15511853 DOI: 10.1080/01443619750113302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- M Geary
- Northwick Park Hospital and St Mark's NHS Trust, Harrow, UK
| | | | | | | |
Collapse
|
13
|
Lamont R, Childs S. Motoneurons influence angiogenesis in the developing zebrafish via class 3 semaphorins. Dev Biol 2007. [DOI: 10.1016/j.ydbio.2007.03.265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
14
|
Lamont R, Childs S. [P94]: Class 3 semaphorins expressed in motoneurons influence angiogenesis in the developing zebrafish. Int J Dev Neurosci 2006. [DOI: 10.1016/j.ijdevneu.2006.09.156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Affiliation(s)
- R. Lamont
- Department of Biochemistry and Molecular BiologyCanada
| | - S. Childs
- Department of Biochemistry and Molecular BiologyCanada
| |
Collapse
|
15
|
Frosk P, Greenberg CR, Tennese AAP, Lamont R, Nylen E, Hirst C, Frappier D, Roslin NM, Zaik M, Bushby K, Straub V, Zatz M, de Paula F, Morgan K, Fujiwara TM, Wrogemann K. The most common mutation in FKRP causing limb girdle muscular dystrophy type 2I (LGMD2I) may have occurred only once and is present in Hutterites and other populations. Hum Mutat 2006; 25:38-44. [PMID: 15580560 DOI: 10.1002/humu.20110] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Limb girdle muscular dystrophy (LGMD) is common in the Hutterite population of North America. We previously identified a mutation in the TRIM32 gene in chromosome region 9q32, causing LGMD2H in approximately two-thirds of the 60 Hutterite LGMD patients studied to date. A genomewide scan was undertaken in five families who did not show linkage to the LGMD2H locus on chromosome 9. A second LGMD locus, LGMD2I, was identified in chromosome region 19q13.3, and the causative mutation was identified as c.826C>A (L276I), a missense mutation in the FKRP gene. A comparison of the clinical characteristics of the two LGMD patient groups in this population reveals some differences. LGMD2I patients generally have an earlier age at diagnosis, a more severe course, and higher serum creatine kinase (CK) levels. In addition, some of these patients show calf hypertrophy, cardiac symptoms, and severe reactions to general anesthesia. None of these features are present among LGMD2H patients. A single common haplotype surrounding the FKRP gene was identified in the Hutterite LGMD2I patients. An identical core haplotype was also identified in 19 other non-Hutterite LGMD2I patients from Europe, Canada, and Brazil. The occurrence of this mutation on a common core haplotype suggests that L276I is a founder mutation that is dispersed among populations of European origin.
Collapse
Affiliation(s)
- Patrick Frosk
- Department of Biochemistry, University of Manitoba, Winnipeg, Canada
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
|
17
|
|
18
|
Abstract
We sought to determine the relationship between an isolated choroid plexus cyst diagnosed antenatally and fetal aneuploidy in an unselected population at a district general hospital. Over a 5-year period all women attending for a detailed anomaly scan at 18-20 weeks' gestation were screened for evidence of a fetal choroid plexus cyst. All cases of choroid plexus cyst were recorded prospectively. The size, position and number of the cysts were noted and associated abnormalities seen on ultrasound were also recorded. Cases of choroid plexus cyst associated with fetal aneuploidy were noted. A total of 13,690 women were screened, and 84 cases of choroid plexus cyst were identified (0.6%). Of these, 41% underwent prenatal karyotyping by amniocentesis; 78 of 84 cases (93%) were isolated. Six had other markers for aneuploidy, and three of these fetuses had trisomy 18. All cases of isolated choroid plexus cyst resulted in chromosomally normal neonates. This was confirmed by either normal antenatal karyotype or postnatal examination by the pediatricians. The size, position and number of cysts did not appear to influence the risk of aneuploidy. We conclude that the risk of aneuploidy for a case of isolated choroid plexus cyst in an unselected population appears to be very low, and in this series was 0%. In this setting, we suggest detailed ultrasound examination is essential, rather than routine karyotyping.
Collapse
Affiliation(s)
- M Geary
- Department of Obstetrics and Gynaecology, Northwick Park Hospital, Harrow, UK
| | | | | |
Collapse
|
19
|
Abstract
The structure of aggregates of lithium perfluorooctanesulfonate (LiFOS) adsorbed to the interface between graphite and aqueous solution have been measured. This fluorocarbon surfactant produces aggregates which are long ( approximately 100 nm) and thin ( approximately 5 nm), and about one molecule ( approximately 1.3 nm) deep. The aggregates lie in straight, parallel arrays on the surface with a characteristic repeat distance, or period, perpendicular to the long axis. As the bulk concentration of LiCl is increased, the period decreases, but as the bulk concentration of LiFOS is increased, the period increases. The decrease in period on addition of salt is similar to that observed for sodium dodecyl sulfate (SDS) and is explicable in terms of electrostatic forces. The increase in period on addition of surfactant is in sharp contrast to the behavior of SDS and may be due to a higher surfactant packing-parameter for LiFOS.
Collapse
Affiliation(s)
- R Lamont
- Department of Chemistry, University of Otago, Dunedin, New Zealand
| | | |
Collapse
|
20
|
Sheehan M, Lamont R. Bacterial vaginosis. Mod Midwife 1996; 6:14-8. [PMID: 8696807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Bacterial vaginosis is the most common cause of vaginal infectious morbidity, including vaginal discharge. The condition is easily diagnosed and treated. If undiagnosed or left untreated, the condition is associated with serious adverse sequelae in both obstetrics and gynaecology. If bacterial vaginosis is detected in early pregnancy, the woman has a five-fold increased risk of late miscarriage or preterm delivery compared with women without the condition. Further research is necessary to establish whether adverse sequelae such as premature labour, preterm prelabour rupture of the membranes, late miscarriage or postpartum endometritis can be reduced by treating the condition in early pregnancy.
Collapse
|
21
|
Underwood K, Sjöström K, Darveau R, Lamont R, Schenkein H, Gunsolley J, Page R, Engel D. Serum antibody opsonic activity against Actinobacillus actinomycetemcomitans in human periodontal diseases. J Infect Dis 1993; 168:1436-43. [PMID: 8245527 DOI: 10.1093/infdis/168.6.1436] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Actinobacillus actinomycetemcomitans is frequently associated with severe periodontitis. Many periodontitis patients have elevated levels of serum IgG antibodies to A. actinomycetemcomitans, but the role of these antibodies is unknown. This study evaluated the functional capacity of anti-A. actinomycetemcomitans IgG antibody to enhance phagocytosis of A. actinomycetemcomitans by polymorphonuclear leukocytes. Chemoluminescence assays were done using sera from 64 subjects, 61 of whom had severe periodontitis; results were compared with the subject's anti-A. actinomycetemcomitans IgG titer and avidity. There was a strong correlation between chemoluminescence and antibody log titer (P < .00001) and a weak correlation between chemoluminescence and antibody avidity (P < .05). The results support the hypothesis that anti-A. actinomycetemcomitans IgG antibodies are important in promoting phagocytosis and killing of A. actinomycetemcomitans. Subjects who develop high levels of highly avid antibodies against A. actinomycetemcomitans may have greater resistance to continued or repeated infection by this pathogen.
Collapse
Affiliation(s)
- K Underwood
- Dept. of Periodontics, University of Washington, Seattle 98195
| | | | | | | | | | | | | | | |
Collapse
|