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Deloison B, Sonigo P, Millischer-Bellaiche AE, Quibel T, Cavallin M, Benoist G, Quelin C, Jouk PS, Lev D, Alison M, Baumann C, Beldjord C, Razavi F, Bessières B, Boddaert N, Ville Y, Salomon LJ, Bahi-Buisson N. Prenatally diagnosed periventricular nodular heterotopia: Further delineation of the imaging phenotype and outcome. Eur J Med Genet 2018; 61:773-782. [PMID: 30391507 DOI: 10.1016/j.ejmg.2018.10.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 11/17/2017] [Revised: 10/24/2018] [Accepted: 10/28/2018] [Indexed: 12/22/2022]
Abstract
OBJECTIVES Periventricular nodular heterotopia (PNH) is a malformation of cortical development which presents with heterogeneous imaging, neurological phenotype and outcome. There is a paucity of comprehensive description detailing the prenatal diagnosis of PNH. The aim of this study is to report neuroimaging features and correlated outcomes in order to delineate the spectrum of prenatally diagnosed PNH. METHODS It was a retrospective study over 15 years in five tertiary centers. All fetuses with prenatally diagnosed PNH were collected. Fetal ultrasound and MRI were reviewed and genetic screening collected. Prenatal findings were analyzed in correlation to fetopathological analyses and post-natal follow up. RESULTS Thirty fetuses (22 females and 8 males) with PNH were identified. The two major ultrasound signs were ventriculomegaly associated with dysmorphic frontal horns (60%) and posterior fossa anomalies (73.3%). On MRI, two groups of PNH were identified: the contiguous and diffuse PNH (n = 15, 50%), often associated with megacisterna magna, and the non-diffuse, either anterior, posterior or unilateral PNH. FLNA mutations were found in 6/11 cases with diffuse PNH. Additional cortical malformations were exclusively observed in non diffuse PNH (9/15; 60%). Twenty-four pregnancies (80%) were terminated. Six children aged 6 months to 5 years are alive. Five have normal neurodevelopment (all had diffuse PNH) whereas one case with non diffuse PNH has developmental delay and epilepsy. CONCLUSION PNH is heterogeneous but patients with diffuse PNH are a common subgroup with specific findings on prenatal imaging and implications for prenatal counseling.
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Affiliation(s)
- B Deloison
- Department of Obstetrics and Gynecology and SFAPE Société Française pour l'Amélioration des Pratiques Echographiques, Necker Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; Université Paris Descartes - Sorbonne Paris Cités, France; EA 7328 FETUS, Université Paris Descartes, France
| | - P Sonigo
- Pediatric Radiology, Necker Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - A E Millischer-Bellaiche
- Pediatric Radiology, Necker Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - T Quibel
- Department of Obstetrics and Gynecology, Poissy Saint-Germain Hospital, Poissy, France
| | - M Cavallin
- Université Paris Descartes - Sorbonne Paris Cités, France; Institut Imagine-INSERM UMR-1163, Embryology and genetics of congenital malformations, France; Pediatric Neurology, Necker Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - G Benoist
- Department of Obstetrics and Gynecology, Caen Hospital, Caen Basse Normandie University, France
| | - C Quelin
- Clinical Genetic Department, Rennes Hospital, France
| | - P S Jouk
- Clinical Genetic Department, Grenoble Hospital, France
| | - D Lev
- Institute of Medical Genetics, Wolfson Medical Center, Holon, Israel
| | - M Alison
- Pediatric Radiology, Robert Debre Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - C Baumann
- Clinical Genetics Department, Robert Debre Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - C Beldjord
- Department of Molecular Genetics, Cochin-Port-Royal Université Paris Descartes - Sorbonne Paris Cités, Paris, France
| | - F Razavi
- Fetopathology Necker Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - B Bessières
- Fetopathology Necker Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - N Boddaert
- Université Paris Descartes - Sorbonne Paris Cités, France; Pediatric Radiology, Necker Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Y Ville
- Department of Obstetrics and Gynecology and SFAPE Société Française pour l'Amélioration des Pratiques Echographiques, Necker Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; Université Paris Descartes - Sorbonne Paris Cités, France; EA 7328 FETUS, Université Paris Descartes, France
| | - L J Salomon
- Department of Obstetrics and Gynecology and SFAPE Société Française pour l'Amélioration des Pratiques Echographiques, Necker Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; Université Paris Descartes - Sorbonne Paris Cités, France; EA 7328 FETUS, Université Paris Descartes, France
| | - N Bahi-Buisson
- Université Paris Descartes - Sorbonne Paris Cités, France; Institut Imagine-INSERM UMR-1163, Embryology and genetics of congenital malformations, France; Pediatric Neurology, Necker Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France.
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Bouilly J, Beau I, Barraud S, Bernard V, Azibi K, Fagart J, Fèvre A, Todeschini AL, Veitia RA, Beldjord C, Delemer B, Dodé C, Young J, Binart N. Identification of Multiple Gene Mutations Accounts for a new Genetic Architecture of Primary Ovarian Insufficiency. J Clin Endocrinol Metab 2016; 101:4541-4550. [PMID: 27603904 DOI: 10.1210/jc.2016-2152] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Idiopathic primary ovarian insufficiency (POI) is a major cause of amenorrhea and infertility. POI affects 1% of women before age 40 years, and several genetic causes have been reported. To date, POI has been considered a monogenic disorder. OBJECTIVE The aim of this study was to identify novel gene variations and to investigate if individuals with POI harbor mutation in multiple loci. PATIENTS AND METHODS One hundred well-phenotyped POI patients were systematically screened for variants in 19 known POI loci (and potential candidate genes) using next-generation sequencing. RESULTS At least one rare protein-altering gene variant was identified in 19 patients, including missense mutations in new candidate genes, namely SMC1β and REC8 (involved in the cohesin complex) and LHX8, a gene encoding a transcription factor. Novel or recurrent deleterious mutations were also detected in the known POI candidate genes NOBOX, FOXL2, SOHLH1, FIGLA, GDF9, BMP15, and GALT. Seven patients harbor mutations in two loci, and this digenicity seems to influence the age of symptom onset. CONCLUSIONS Genetic anomalies in women with POI are more frequent than previously believed. Digenic findings in several cases suggest that POI is not a purely monogenic disorder and points to a role of digenicity. The genotype-phenotype correlations in some kindreds suggest that a synergistic effect of several mutations may underlie the POI phenotype.
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Affiliation(s)
- Justine Bouilly
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Isabelle Beau
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Sara Barraud
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Valérie Bernard
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Kemal Azibi
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Jérôme Fagart
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Anne Fèvre
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Anne Laure Todeschini
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Reiner A Veitia
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Chérif Beldjord
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Brigitte Delemer
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Catherine Dodé
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Jacques Young
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
| | - Nadine Binart
- Inserm 1185 (J.B., I.B., S.B., J.F., J.Y., N.B.), Le Kremlin-Bicêtre, Université Paris-Saclay, Faculté de Médecine Paris Sud, 94270 Le Kremlin-Bicêtre, France; Service de Biochimie et Génétique Moléculaire (K.A., C.B., C.D.), Hôpital Cochin, AP-HP, Université Paris-Descartes, 75004 Paris, France; Service d'Endocrinologie-Diabète-Nutrition (A.F., B.D.), CHU de Reims-Hôpital Robert-Debré, 51100 Reims, France; Institut Jacques Monod (A.L.T., R.A.V.), Université Paris Diderot-PARIS 7/CNRS UMR7592, 75013 Paris, France; and Service d'Endocrinologie et des Maladies de la Reproduction (J.Y.), APHP, Hôpital de Bicêtre, 94270 Le Kremlin-Bicêtre, France
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Degos B, Toussaint A, Lesage S, Brice A, Vidailhet M, Beldjord C, Catala M. PINK1 and FLNA mutations association: A role for atypical parkinsonism? Parkinsonism Relat Disord 2016; 26:78-80. [PMID: 26969111 DOI: 10.1016/j.parkreldis.2016.02.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 02/20/2016] [Accepted: 02/29/2016] [Indexed: 10/22/2022]
Affiliation(s)
- Bertrand Degos
- Département des Maladies du Système Nerveux, Centre Inter-Régional de Coordination de la Maladie de Parkinson, Hôpital Pitié-Salpêtrière, APHP, Paris, 75013, France.
| | - Aurélie Toussaint
- Biochimie et Génétique Moléculaire, Hôpital Cochin, AP-HP, Université Paris Descartes, Paris, France
| | - Suzanne Lesage
- Sorbonne Universités, UPMC Univ Paris 6 UMR S 1127, Inserm U 1127, CNRS UMR 722, Institut du Cerveau et de la Moelle épinière, Paris, France
| | - Alexis Brice
- Sorbonne Universités, UPMC Univ Paris 6 UMR S 1127, Inserm U 1127, CNRS UMR 722, Institut du Cerveau et de la Moelle épinière, Paris, France; Institut Hospitalo-Universitaire (IHU), Hôpital Pitié-Salpêtrière, APHP, Paris, 75013, France
| | - Marie Vidailhet
- Département des Maladies du Système Nerveux, Centre Inter-Régional de Coordination de la Maladie de Parkinson, Hôpital Pitié-Salpêtrière, APHP, Paris, 75013, France; Sorbonne Universités, UPMC Univ Paris 6 UMR S 1127, Inserm U 1127, CNRS UMR 722, Institut du Cerveau et de la Moelle épinière, Paris, France; Institut Hospitalo-Universitaire (IHU), Hôpital Pitié-Salpêtrière, APHP, Paris, 75013, France
| | - Chérif Beldjord
- Biochimie et Génétique Moléculaire, Hôpital Cochin, AP-HP, Université Paris Descartes, Paris, France
| | - Martin Catala
- Département des Maladies du Système Nerveux, Centre Inter-Régional de Coordination de la Maladie de Parkinson, Hôpital Pitié-Salpêtrière, APHP, Paris, 75013, France; Université Pierre et Marie Curie-Paris 6, Laboratoire de Biologie du Développement, UMR 7622, Paris, 75005, France; Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement, UMR 7622 Paris, 75005, France
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Echevarria L, Benistan K, Toussaint A, Dubourg O, Hagege A, Eladari D, Jabbour F, Beldjord C, De Mazancourt P, Germain D. X-chromosome inactivation in female patients with Fabry disease. Clin Genet 2015; 89:44-54. [DOI: 10.1111/cge.12613] [Citation(s) in RCA: 226] [Impact Index Per Article: 25.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 05/03/2015] [Accepted: 05/12/2015] [Indexed: 12/11/2022]
Affiliation(s)
- L. Echevarria
- Division of Medical Genetics; University of Versailles; Montigny France
- Assistance Publique - Hôpitaux de Paris (AP-HP); Referral Center for Fabry Disease and Inherited Disorders of Connective Tissue; Garches France
| | - K. Benistan
- Assistance Publique - Hôpitaux de Paris (AP-HP); Referral Center for Fabry Disease and Inherited Disorders of Connective Tissue; Garches France
| | - A. Toussaint
- Laboratory of Biochemistry and Molecular Biology; University Paris V Descartes; Paris France
| | - O. Dubourg
- Department of Cardiology; University of Versailles; Boulogne France
| | - A.A. Hagege
- Department of Cardiology, HEGP (APHP); Paris France
| | - D. Eladari
- Department of Physiology, HEGP (APHP); University Paris V Descartes; Paris France
| | - F. Jabbour
- Assistance Publique - Hôpitaux de Paris (AP-HP); Referral Center for Fabry Disease and Inherited Disorders of Connective Tissue; Garches France
| | - C. Beldjord
- Laboratory of Biochemistry and Molecular Biology; University Paris V Descartes; Paris France
| | - P. De Mazancourt
- UFR des sciences de la santé; University of Versailles; Montigny France
| | - D.P. Germain
- Division of Medical Genetics; University of Versailles; Montigny France
- Assistance Publique - Hôpitaux de Paris (AP-HP); Referral Center for Fabry Disease and Inherited Disorders of Connective Tissue; Garches France
- UFR des sciences de la santé; University of Versailles; Montigny France
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Jain P, Sharma S, Bahi-Buisson N, Beldjord C, Aneja S. Bilateral frontoparietal polymicrogyria. Indian J Pediatr 2015; 82:390-1. [PMID: 25416088 DOI: 10.1007/s12098-014-1614-1] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Accepted: 10/15/2014] [Indexed: 10/24/2022]
Affiliation(s)
- Puneet Jain
- Division of Pediatric Neurology, Department of Pediatrics, Lady Hardinge Medical College and Associated Kalawati Saran Children's Hospital, New Delhi, India,
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Boudrahem-Addour N, Carion N, Moualek D, Mekki A, Benhassine T, Beldjord C. Exploration moléculaire des lissencéphalies : à propos de quatre cas. Rev Neurol (Paris) 2014. [DOI: 10.1016/j.neurol.2014.01.394] [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: 11/25/2022]
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Chaussain C, Bouazza N, Gasse B, Laffont AG, Opsahl Vital S, Davit-Béal T, Moulis E, Chabadel O, Hennequin M, Courson F, Droz D, Vaysse F, Laboux O, Tassery H, Carel JC, Alcais A, Treluyer JM, Beldjord C, Sire JY. Dental caries and enamelin haplotype. J Dent Res 2014; 93:360-5. [PMID: 24487377 DOI: 10.1177/0022034514522060] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
In the literature, the enamelin gene ENAM has been repeatedly designated as a possible candidate for caries susceptibility. Here, we checked whether ENAM variants could increase caries susceptibility. To this aim, we sequenced coding exons and exon-intron boundaries of ENAM in 250 children with a severe caries phenotype and in 149 caries-free patients from 9 French hospital groups. In total, 23 single-nucleotide polymorphisms (SNPs) were found, but none appeared to be responsible for a direct change of ENAM function. Six SNPs had a high minor allele frequency (MAF) and 6 others were identified for the first time. Statistical and evolutionary analyses showed that none of these SNPs was associated with caries susceptibility or caries protection when studied separately and challenged with environmental factors. However, haplotype interaction analysis showed that the presence, in a same variant, of 2 exonic SNPs (rs7671281 and rs3796704; MAF 0.12 and 0.10, respectively), both changing an amino acid in the protein region encoded by exon 10 (p.I648T and p.R763Q, respectively), increased caries susceptibility 2.66-fold independent of the environmental risk factors. These findings support ENAM as a gene candidate for caries susceptibility in the studied population.
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Affiliation(s)
- C Chaussain
- AP-HP, Service Odontologie Bretonneau - Louis Mourier HUPNVS and Centre de référence des maladies du métabolisme du phosphore et du calcium, Paris, France
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8
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Gasse B, Grabar S, Lafont AG, Quinquis L, Opsahl Vital S, Davit-Béal T, Moulis E, Chabadel O, Hennequin M, Courson F, Droz D, Vaysse F, Laboux O, Tassery H, Al-Hashimi N, Boillot A, Carel JC, Treluyer JM, Jeanpierre M, Beldjord C, Sire JY, Chaussain C. Common SNPs of AmelogeninX (AMELX) and dental caries susceptibility. J Dent Res 2013; 92:418-24. [PMID: 23525533 DOI: 10.1177/0022034513482941] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Genetic approaches have shown that several genes could modify caries susceptibility; AmelogeninX (AMELX) has been repeatedly designated. Here, we hypothesized that AMELX mutations resulting in discrete changes of enamel microstructure may be found in children with a severe caries phenotype. In parallel, possible AMELX mutations that could explain resistance to caries may be found in caries-free patients. In this study, coding exons of AMELX and exon-intron boundaries were sequenced in 399 individuals with extensive caries (250) or caries-free (149) individuals from nine French hospital groups. No mutation responsible for a direct change of amelogenin function was identified. Seven single-nucleotide polymorphisms (SNPs) were found, 3 presenting a high allele frequency, and 1 being detected for the first time. Three SNPs were located in coding regions, 2 of them being non-synonymous. Both evolutionary and statistical analyses showed that none of these SNPs was associated with caries susceptibility, suggesting that AMELX is not a gene candidate in our studied population.
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Affiliation(s)
- B Gasse
- UMR 7138, Université Pierre et Marie Curie, 75005 Paris, France
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9
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Marcorelles P, Laquerrière A, Adde-Michel C, Marret S, Saugier-Veber P, Beldjord C, Friocourt G. Evidence for tangential migration disturbances in human lissencephaly resulting from a defect in LIS1, DCX and ARX genes. Acta Neuropathol 2010; 120:503-15. [PMID: 20461390 DOI: 10.1007/s00401-010-0692-z] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2009] [Revised: 04/22/2010] [Accepted: 04/27/2010] [Indexed: 01/31/2023]
Abstract
During corticogenesis, neurons adopt different migration pathways to reach their final position. The precursors of pyramidal neurons migrate radially, whereas most of the GABA-containing interneurons are generated in the ventral telencephalon and migrate tangentially into the neocortex. Then, they use a radial migration mode to establish themselves in an inside-out manner in the neocortex, similarly to pyramidal neurons. In humans, the most severe defects in radial migration result in lissencephaly. Lately, a few studies suggested that lissencephaly was also associated with tangential neuronal migration deficits. In the present report, we investigated potential anomalies of this migration mode in three agyric/pachygyric syndromes due to defects in the LIS1, DCX and ARX genes. Immunohistochemistry was performed on paraffin-embedded supra- and infratentorial structures using calretinin, calbindin and parvalbumin antisera. The results were compared with age-matched control brain tissue. In the Miller-Dieker syndrome, GABAergic neurons were found both in upper layers of the cortex and in heterotopic positions in the intermediate zone and in ganglionic eminences. In the DCX mutant brain, few interneurons were dispersed in the cortical plate, with a massive accumulation in the intermediate zone and subventricular zone as well as in the ganglionic eminences. In the ARX-mutated brain, the cortical plate contained almost exclusively pyramidal cells and was devoid of interneurons. The ganglionic eminences and basal ganglia were poorly cellular, suggesting an interneuron production and/or differentiation defect. These data argue for different mechanisms of telencephalic tangential migration impairment in these three agyric/pachygyric syndromes.
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Affiliation(s)
- Pascale Marcorelles
- Pathology Laboratory, Pole Pathologie-Biologie, Brest University Hospital, Brest, France.
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10
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Saillour Y, Carion N, Quelin C, Leger PL, Boddaert N, Elie C, Toutain A, Mercier S, Barthez MA, Milh M, Joriot S, des Portes V, Philip N, Broglin D, Roubertie A, Pitelet G, Moutard ML, Pinard JM, Cances C, Kaminska A, Chelly J, Beldjord C, Bahi-Buisson N. LIS1-Related Isolated Lissencephaly. ACTA ACUST UNITED AC 2009; 66:1007-15. [DOI: 10.1001/archneurol.2009.149] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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11
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Bahi-Buisson N, Boddaert N, Saillour Y, Souville I, Poirier K, Léger PL, Castelnau L, Plouin P, Carion N, Beldjord C, Chelly J. Malformations cérébrales et épilepsie : présentations radiocliniques et implications pour le diagnostic génétique. Rev Neurol (Paris) 2008; 164:995-1009. [DOI: 10.1016/j.neurol.2008.04.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2008] [Revised: 03/14/2008] [Accepted: 04/02/2008] [Indexed: 02/02/2023]
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12
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Bahi-Buisson N, Poirier K, Boddaert N, Saillour Y, Castelnau L, Philip N, Buyse G, Villard L, Joriot S, Marret S, Bourgeois M, Van Esch H, Lagae L, Amiel J, Hertz-Pannier L, Roubertie A, Rivier F, Pinard JM, Beldjord C, Chelly J. Refinement of cortical dysgeneses spectrum associated with TUBA1A mutations. J Med Genet 2008; 45:647-53. [PMID: 18728072 DOI: 10.1136/jmg.2008.058073] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
OBJECTIVE We have recently shown that de novo mutations in the TUBA1A gene are responsible for a wide spectrum of neuronal migration disorders. To better define the range of these abnormalities, we searched for additional mutations in a cohort of 100 patients with lissencephaly spectrum for whom no mutation was identified in DCX, LIS1 and ARX genes and compared these data to five previously described patients with TUBA1A mutations. RESULTS We detected de novo TUBA1A mutations in six patients and highlight the existence of a prominent form of TUBA1A related lissencephaly. In four patients, the mutations identified, c.1190T>C (p.L397P), c.1265G>A (p.R422H), c.1264C>T (p.R422C), c.1306G>T (p.G436R), have not been reported before and in two others, the mutation corresponds to a recurrent missense mutation, c.790C>T (p.R264C), likely to be a hot spot of mutation. All together, it emerges that the TUBA1A related lissencephaly spectrum ranges from perisylvian pachygyria, in the less severe form, to posteriorly predominant pachygyria in the most severe, associated with dysgenesis of the anterior limb of the internal capsule and mild to severe cerebellar hypoplasia. When compared with a large series of lissencephaly of other origins (ILS17, ILSX or unknown origin), these features appear to be specific to TUBA1A related lissencephaly. In addition, TUBA1A mutated patients share a common clinical phenotype that consists of congenital microcephaly, mental retardation and diplegia/tetraplegia. CONCLUSIONS Our data highlight the presence of consistent and specific abnormalities that should allow the differentiation of TUBA1A related lissencephalies from those related to LIS1, DCX and ARX genes.
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Affiliation(s)
- N Bahi-Buisson
- Pediatric Neurology Hopital Necker Enfants Malades, 149 rue de Sèvres, 75015 Paris, France.
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13
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Poirier K, Eisermann M, Caubel I, Kaminska A, Peudonnier S, Boddaert N, Saillour Y, Dulac O, Souville I, Beldjord C, Lascelles K, Plouin P, Chelly J, Bahi-Buisson N. Combination of infantile spasms, non-epileptic seizures and complex movement disorder: a new case of ARX-related epilepsy. Epilepsy Res 2008; 80:224-8. [PMID: 18468866 DOI: 10.1016/j.eplepsyres.2008.03.019] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2008] [Revised: 03/13/2008] [Accepted: 03/23/2008] [Indexed: 11/27/2022]
Abstract
Mutations in the ARX gene are responsible for a wide variety of mental retardation conditions including X-linked infantile spasms (ISSX) and generalized dystonia. However, electroclinical descriptions in patients with ISSX carrying ARX mutations are scarce. Here, we report on the electroclinical features of a 4-year-old boy with an expansion of the trinucleotide repeat in the ARX gene. Epilepsy started at 2 months of age with subclinical spasms that consisted of episodes of eye rolling combined with atypical hypsarrhythmia. Later, the condition evolved into severe mental retardation with polymorphic ictal episodes that consisted of nocturnal brief axial contractions followed by dyskinetic movement of all four limbs and diurnal clusters of chaotic movements combined with myoclonic jerks. EEG recording of these episodes lead to the diagnosis of non-ictal dyskinetic movements. This combination of early infantile spasms followed by a complex movement disorder contributes further to extent the pleiotropy of the ARX-linked "interneuronopathy" and should lead the clinician to ARX mutation screening.
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Affiliation(s)
- Karine Poirier
- Institut Cochin, INSERM U567, UMR 8104, Université René Descartes, Paris V, France
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14
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Frints SGM, Lenzner S, Bauters M, Jensen LR, Van Esch H, des Portes V, Moog U, Macville MVE, van Roozendaal K, Schrander-Stumpel CTRM, Tzschach A, Marynen P, Fryns JP, Hamel B, van Bokhoven H, Chelly J, Beldjord C, Turner G, Gecz J, Moraine C, Raynaud M, Ropers HH, Froyen G, Kuss AW. MCT8 mutation analysis and identification of the first female with Allan–Herndon–Dudley syndrome due to loss of MCT8 expression. Eur J Hum Genet 2008; 16:1029-37. [DOI: 10.1038/ejhg.2008.66] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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15
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Poirier K, Keays DA, Francis F, Saillour Y, Bahi N, Manouvrier S, Fallet-Bianco C, Pasquier L, Toutain A, Tuy FPD, Bienvenu T, Joriot S, Odent S, Ville D, Desguerre I, Goldenberg A, Moutard ML, Fryns JP, van Esch H, Harvey RJ, Siebold C, Flint J, Beldjord C, Chelly J. Large spectrum of lissencephaly and pachygyria phenotypes resulting from de novo missense mutations in tubulin alpha 1A (TUBA1A). Hum Mutat 2007; 28:1055-64. [PMID: 17584854 DOI: 10.1002/humu.20572] [Citation(s) in RCA: 176] [Impact Index Per Article: 10.4] [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: 11/10/2022]
Abstract
We have recently reported a missense mutation in exon 4 of the tubulin alpha 1A (Tuba1a) gene in a hyperactive N-ethyl-N-nitrosourea (ENU) induced mouse mutant with abnormal lamination of the hippocampus. Neuroanatomical similarities between the Tuba1a mutant mouse and mice deficient for Doublecortin (Dcx) and Lis1 genes, and the well-established functional interaction between DCX and microtubules (MTs), led us to hypothesize that mutations in TUBA1A (TUBA3, previous symbol), the human homolog of Tuba1a, might give rise to cortical malformations. This hypothesis was subsequently confirmed by the identification of TUBA1A mutations in two patients with lissencephaly and pachygyria, respectively. Here we report additional TUBA1A mutations identified in six unrelated patients with a large spectrum of brain dysgeneses. The de novo occurrence was shown for all mutations, including one recurrent mutation (c.790C>T, p.R264C) detected in two patients, and two mutations that affect the same amino acid (c.1205G>A, p.R402H; c.1204C>T, p.R402C) detected in two other patients. Retrospective examination of MR images suggests that patients with TUBA1A mutations share not only cortical dysgenesis, but also cerebellar, hippocampal, corpus callosum, and brainstem abnormalities. Interestingly, the specific high level of Tuba1a expression throughout the period of central nervous system (CNS) development, shown by in situ hybridization using mouse embryos, is in accordance with the brain-restricted developmental phenotype caused by TUBA1A mutations. All together, these results, in combination with previously reported data, strengthen the relevance of the known interaction between MTs and DCX, and highlight the importance of the MTs/DCX complex in the neuronal migration process.
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Affiliation(s)
- Karine Poirier
- Institut Cochin, Université Paris Descartes, Centre national de la recherche scientifique Unité Mixte de Recherche 8104, Paris, France
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16
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de Brouwer APM, Yntema HG, Kleefstra T, Lugtenberg D, Oudakker AR, de Vries BBA, van Bokhoven H, Van Esch H, Frints SGM, Froyen G, Fryns JP, Raynaud M, Moizard MP, Ronce N, Bensalem A, Moraine C, Poirier K, Castelnau L, Saillour Y, Bienvenu T, Beldjord C, des Portes V, Chelly J, Turner G, Fullston T, Gecz J, Kuss AW, Tzschach A, Jensen LR, Lenzner S, Kalscheuer VM, Ropers HH, Hamel BCJ. Mutation frequencies of X-linked mental retardation genes in families from the EuroMRX consortium. Hum Mutat 2007; 28:207-8. [PMID: 17221867 DOI: 10.1002/humu.9482] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [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: 11/09/2022]
Abstract
The EuroMRX family cohort consists of about 400 families with non-syndromic and 200 families with syndromic X-linked mental retardation (XLMR). After exclusion of Fragile X (Fra X) syndrome, probands from these families were tested for mutations in the coding sequence of 90 known and candidate XLMR genes. In total, 73 causative mutations were identified in 21 genes. For 42% of the families with obligate female carriers, the mental retardation phenotype could be explained by a mutation. There was no difference between families with (lod score >2) or without (lod score <2) significant linkage to the X chromosome. For families with two to five affected brothers (brother pair=BP families) only 17% of the MR could be explained. This is significantly lower (P=0.0067) than in families with obligate carrier females and indicates that the MR in about 40% (17/42) of the BP families is due to a single genetic defect on the X chromosome. The mutation frequency of XLMR genes in BP families is lower than can be expected on basis of the male to female ratio of patients with MR or observed recurrence risks. This might be explained by genetic risk factors on the X chromosome, resulting in a more complex etiology in a substantial portion of XLMR patients. The EuroMRX effort is the first attempt to unravel the molecular basis of cognitive dysfunction by large-scale approaches in a large patient cohort. Our results show that it is now possible to identify 42% of the genetic defects in non-syndromic and syndromic XLMR families with obligate female carriers.
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Affiliation(s)
- Arjan P M de Brouwer
- Department of Human Genetics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
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Poirier K, Lacombe D, Gilbert-Dussardier B, Raynaud M, Desportes V, de Brouwer APM, Moraine C, Fryns JP, Ropers HH, Beldjord C, Chelly J, Bienvenu T. Screening of ARX in mental retardation families: Consequences for the strategy of molecular diagnosis. Neurogenetics 2005; 7:39-46. [PMID: 16235064 DOI: 10.1007/s10048-005-0014-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2005] [Accepted: 08/05/2005] [Indexed: 10/25/2022]
Abstract
Mutations in the human ARX gene have been shown to cause nonsyndromic X-linked mental retardation (MRX) as well as syndromic forms such as X-linked lissencephaly with abnormal genitalia (XLAG), Partington syndrome and X-linked infantile spasm. The most common causative mutation, a duplication of 24 bp, was found in families with a variety of phenotypes, but not in the more severe XLAG phenotypes. The aim of the study was to access the frequency of ARX mutations in families with established or putative X-linked mental retardation (XLMR) collected by the European XLMR Consortium. We screened the entire coding region of ARX for mutations in 197 novel XLMR families by denaturing high-performance liquid chromatography, and we identified eight mutations (six c.428_451dup24, one insertion and one novel missense mutation p.P38S). To better define the prevalence of ARX mutations, we included previously reported results of 157 XLMR families. Together, these data showed the relatively high rate (9.5%) of ARX mutations in X-linked MR families and an expectedly low rate in families with affected brother pairs (2.2%). This study confirms that the frequency of ARX mutations is high in XLMR, and the analysis of ARX in MRX should not be limited to duplication.
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Affiliation(s)
- K Poirier
- Université Paris Descartes, Faculté de Medicine René Descarte, UMR-S 8104, Paris, F-75014 France
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18
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Zanni G, Saillour Y, Nagara M, Billuart P, Castelnau L, Moraine C, Faivre L, Bertini E, Durr A, Guichet A, Rodriguez D, des Portes V, Beldjord C, Chelly J. Oligophrenin 1 mutations frequently cause X-linked mental retardation with cerebellar hypoplasia. Neurology 2005; 65:1364-9. [PMID: 16221952 DOI: 10.1212/01.wnl.0000182813.94713.ee] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.5] [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: 11/15/2022] Open
Abstract
BACKGROUND Mutations of oligophrenin 1, one of the first genes identified in nonspecific X-linked mental retardation (MRX), have been described in patients with moderate to severe cognitive impairment and predominant cerebellar hypoplasia, in the vermis. OBJECTIVE To further delineate the phenotypic and mutational spectrum of the syndrome, by screening oligophrenin 1 in two cohorts of male patients with mental retardation (MR) with or without known posterior fossa anomalies. METHODS Clinical examination, cognitive testing, MRI studies, and mutational analysis (denaturing gradient gel electrophoresis and direct sequencing) on blood lymphocytes were performed in 213 unrelated affected individuals: 196 patients classified as MRX and 17 patients with MR and previously detected cerebellar anomalies. RESULTS Four novel oligophrenin 1 mutations were identified. In the MRX group, two nonsense mutations were detected. In the MR group, two mutations were found: a deletion of exons 16 to 17 and a splice site mutation. All patients shared characteristic clinical, radiologic, and distinctive features with a degree of intrafamilial variability in motor and cognitive deficits. CONCLUSIONS Oligophrenin 1 mutations were found in 12% (2/17) of individuals with mental retardatin and known cerebellar anomalies and in 1% (2/196) of the X-linked mental retardation group.
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Affiliation(s)
- G Zanni
- University of Paris 5 René Descartes, INSERM Unité 567, CNRS UMR8104, Paris, France
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Gyan E, Frew M, Bowen D, Beldjord C, Preudhomme C, Lacombe C, Mayeux P, Dreyfus F, Porteu F, Fontenay M. Mutation in RAP1 is a rare event in myelodysplastic syndromes. Leukemia 2005; 19:1678-80. [PMID: 16118622 DOI: 10.1038/sj.leu.2403882] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Poirier K, Abriol J, Souville I, Laroche-Raynaud C, Beldjord C, Gilbert B, Chelly J, Bienvenu T. Maternal mosaicism for mutations in the ARX gene in a family with X linked mental retardation. Hum Genet 2005; 118:45-8. [PMID: 16078051 DOI: 10.1007/s00439-005-0011-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2005] [Accepted: 06/01/2005] [Indexed: 10/25/2022]
Abstract
We describe two brothers with mental retardation (MR) due to a c.428_451dup24 in the ARX gene. The mother did not apparently carry the mutation, as determined by dHPLC and by fragment size analysis. Using semiquantitative fluorescent PCR, we show however that 4% of her lymphocytes and 24% of her fibroblasts harbored the duplication. We thus show that the mother displays somatic mosaicism for the duplication thereby highlighting the need to reconsider the molecular screening in sporadic cases of MR.
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Affiliation(s)
- K Poirier
- Institut Cochin - INSERM U567, Université Paris V René Descartes, IFR116, 24 rue du Faubourg St Jacques, 75014, Paris, France
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Biancalana V, Beldjord C, Taillandier A, Szpiro-Tapia S, Cusin V, Gerson F, Philippe C, Mandel JL. Five years of molecular diagnosis of Fragile X syndrome (1997-2001): a collaborative study reporting 95% of the activity in France. Am J Med Genet A 2005; 129A:218-24. [PMID: 15326620 DOI: 10.1002/ajmg.a.30237] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [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: 11/07/2022]
Abstract
The Fragile X syndrome is the most common cause of inherited mental retardation. Clinical features are neither specific nor constant and molecular diagnosis is thus widely used since the characterization of the causal mutation in 1991. The aim of this project was to study the evolution of Fragile X diagnosis in France. A preliminary study of the efficiency of screening for the Fragile X mutation in mentally retarded probands with no previous familial diagnosis was done in the Strasbourg's laboratory with a comparison between data from 1991-1994 and 1997-2000. This study showed an improvement in the use of the Fragile X testing regarding the probands' age at diagnosis and the recruitment of sporadic and female cases. To avoid possible bias in clinical referrals and to evaluate the situation nation wide, this study was enlarged to 28 of the 30 laboratories involved in the Fragile X diagnosis in France from 1997 to 2001 (20,816 probands tested, data representative of 95% of the national screening activity). Median age at diagnosis decreased from 9.2 to 5.8 (average 16-11.6y) between the 1991-1994 and the 1997-2001 studies. Over this period, 477 new families were diagnosed with Fragile X, representing 2.8% of tested male probands (417/14,867) and 1.0% of tested female probands (60/5,949). Forty one percent of positive cases corresponded to probands with a familial history of mental retardation, compared to 66% in the initial (1991-1994) study. We also discuss issues concerning premutations discovered in affected individuals and in females with premature ovarian failure (POF).
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Gyan E, Bowen D, Frew M, Beldjord C, Preudhomme C, Dreyfus F, Mayeux P, Lacombe C, Porteu F, Fontenay M. P-48 rap1b point mutations homologousto activating RAS mutations are uncommon during MDS leukemic transformation. Leuk Res 2005. [DOI: 10.1016/s0145-2126(05)80112-2] [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: 11/29/2022]
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Béroud C, Carrié A, Beldjord C, Deburgrave N, Llense S, Carelle N, Peccate C, Cuisset JM, Pandit F, Carré-Pigeon F, Mayer M, Bellance R, Récan D, Chelly J, Kaplan JC, Leturcq F. Dystrophinopathy caused by mid-intronic substitutions activating cryptic exons in the DMD gene. Neuromuscul Disord 2004; 14:10-8. [PMID: 14659407 DOI: 10.1016/s0960-8966(03)00169-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [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: 10/26/2022]
Abstract
In the course of a mutation search performed by muscle dystrophin transcript analysis in 72 Duchenne and Becker Muscular Dystrophies (DMD/BMD) patients without gross gene defect, we encountered four unrelated cases with additional out-of-frame sequences precisely intercalated between two intact exons of the mature muscle dystrophin mRNA. An in silico search of the whole dystrophin genomic sequence revealed that these inserts correspond to cryptic exons flanked by one strong and one weak consensus splice site and located in the mid-part of large introns (introns 60, 9, 1M, and 62, respectively). In each case we identified an intronic point mutation activating the cryptic donor or acceptor splice site. The patients exhibited a BMD/intermediate phenotype consistent with the presence of reduced amounts of normally spliced transcript and normal dystrophin. The frequency of this new type of mutation is not negligible (6% of our series of 65 patients with 'small' mutations). It would be missed if the exploration of the DMD gene is exclusively performed on exons and flanking sequences of genomic DNA.
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Affiliation(s)
- Christophe Béroud
- Institut Cochin and Laboratory of Molecular Genetics, Cochin Hospital, Paris, France
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Deconinck N, Duprez T, des Portes V, Beldjord C, Ghariani S, Sindic CJM, Sébire G. Familial bilateral medial parietooccipital band heterotopia not related to DCX or LIS1 gene defects. Neuropediatrics 2003; 34:146-8. [PMID: 12910438 DOI: 10.1055/s-2003-41271] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A father and his daughter displayed strictly similar focal brain dysplasia at MR examination, characterized by regional medial posterior laminar sub-cortical grey matter heterotopia. To our knowledge, no family presenting such anomalies has yet been described. LIS1 and DCX gene defects were excluded. Collecting patients with such inherited dysplasia should improve our knowledge of the genetic basis of cortical malformations.
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Affiliation(s)
- N Deconinck
- Service de Neurologie Pédiatrique, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain, Brussels, Belgium
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25
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Bienvenu T, Poirier K, Van Esch H, Hamel B, Moraine C, Fryns JP, Ropers HH, Beldjord C, Yntema HG, Chelly J. Rare polymorphic variants of the AGTR2 gene in boys with non-specific mental retardation. J Med Genet 2003; 40:357-9. [PMID: 12746399 PMCID: PMC1735452 DOI: 10.1136/jmg.40.5.357] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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26
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Couvert P, Poirier K, Carrié A, Chalas C, Jouannet P, Beldjord C, Bienvenu T, Chelly J, Kerjean A. DHPLC-based method for DNA methylation analysis of differential methylated regions from imprinted genes. Biotechniques 2003; 34:356-62. [PMID: 12613258 DOI: 10.2144/03342rr06] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [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: 11/23/2022] Open
Abstract
The bisulfite genomic sequencing method is one of the most widely used techniques for methylation analysis in heterogeneous unbiased PCR, amplifying for both methylated and unmethylated alleles simultaneously. However, it requires labor-intensive and time-consuming cloning and sequencing steps. In the current study, we used a denaturing high-performance liquid chromatography (DHPLC) procedure in a complementary way with the bisulfite genomic sequencing to analyze the methylation of differentially methylated regions (DMRs) of imprinted genes. We showed reliable and reproducible results in distinguishing overall methylation profiles of DMRs regions of human SNRPN, H19, MEST/PEG1, LIT1, IGF2, TSSC5, WT1 antisense, and mouse H19, Mest/Peg1, Igf2R imprinted genes. These DHPLC profiles were in accordance with bisulfite genomic sequencing data and may serve as a type of "fingerprint," revealing the overall methylation status of DMRs associated with sample heterogeneity. We conclude that DHPLC analysis could be used to increase the throughput efficiency of methylation pattern analysis of imprinted genes after the bisulfite conversion of genomic DNA and unbiased PCR amplification.
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Affiliation(s)
- P Couvert
- Université Paris V-CHU Cochin, Paris, France
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27
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des Portes V, Abaoub L, Joannard A, Souville I, Francis F, Pinard JM, Chelly J, Beldjord C, Jouk PS. So-called 'cryptogenic' partial seizures resulting from a subtle cortical dysgenesis due to a doublecortin gene mutation. Seizure 2002; 11:273-7. [PMID: 12027577 DOI: 10.1053/seiz.2001.0607] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [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: 11/11/2022] Open
Abstract
We report the case of a female suffering from resistant partial seizures, which were related to 'cryptogenic' epilepsy, as the cerebral cortex was considered normal on the initial MRI images. As her son is mentally retarded and has a pachygyria, the doublecortin gene, usually involved in band heterotopia or lissencephaly, was screened for mutations. A missense mutation was identified, shared by both the son and his mother, and a subtle discontinuous subcortical heterotopia was subsequently detected on the mother's MRI. The pathophysiology of epilepsy in this woman is discussed in the light of the role of doublecortin, not only in neuronal migration, but also in axonal growth and dendritic connectivity.
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Affiliation(s)
- V des Portes
- Service de neuropédiatrie, Hôpital Saint Vincent-de-Paul, Paris, France.
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28
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Bienvenu T, Souville I, Poirier K, Aquaviva C, Burglen L, Amiel J, Héron B, Kaminska A, Couvert P, Beldjord C, Chelly J. Five novel frameshift mutations in exon 3 and 4 of the MECP2 gene identified in Rett patients: Consequences for the molecular diagnosis strategy. Hum Mutat 2001; 18:251-2. [PMID: 11524737 DOI: 10.1002/humu.1182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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: 11/11/2022]
Abstract
Rett syndrome (RTT) is a severe progressive neurological disorder that affects almost exclusively females. The gene responsible for this disorder, MECP2, was recently identified by candidate gene strategy. Mutations were detected in 70-85% of RTT cases. We report here five novel frameshift mutations (named 345delC, 895del202, 989ins18del8, 996insAG and 1124del53) in exon 3 and 4 of the MECP2 gene. To avoid the missing of few small deletions in RTT patients using classical mutation screening approaches, we suggest that screening of the mutations in the MECP2 gene in RTT girls should include at least a large PCR to amplify exon 4 entirely.
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Affiliation(s)
- T Bienvenu
- Laboratoire de Biochimie et Génétique Moléculaire and INSERM U129-ICGM, Hôpital Cochin, 123 boulevard de Port-Royal, 75014 Paris, France.
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29
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Vourc'h P, Bienvenu T, Beldjord C, Chelly J, Barthélémy C, Müh JP, Andres C. No mutations in the coding region of the Rett syndrome gene MECP2 in 59 autistic patients. Eur J Hum Genet 2001; 9:556-8. [PMID: 11464249 DOI: 10.1038/sj.ejhg.5200660] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2001] [Revised: 03/28/2001] [Accepted: 04/03/2001] [Indexed: 11/08/2022] Open
Abstract
Autistic disorder is a pervasive developmental disorder considered to have a multigenic origin. Mental retardation is present in 75% of autistic patients. Autistic features are found in Rett syndrome, a neurological disorder affecting girls and associated with severe mental retardation. Recently, the gene responsible for the Rett syndrome, methyl CpG-binding protein (MECP2) gene, was identified on the X chromosome by a candidate gene strategy. Mutations in this gene were also observed in some mentally retarded males. In this study we tested MECP2 as a candidate gene in autistic disorder by a DGGE analysis of its coding region and intron-exon boundaries. Among 59 autistic patients, 42 males and 17 females, mentally retarded or not, no mutations or polymorphisms were present in the MECP2 gene. Taking into account the size of our sample, we conclude that MECP2 coding sequence mutations are not an important factor (less than 5% of cases) in the aetiology of autistic disorder.
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Affiliation(s)
- P Vourc'h
- Laboratoire de Biochimie et Biologie Moléculaire, INSERM U 316, 2 bis Bd Tonnellé, 37032 Tours Cedex, France
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30
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Girard M, Couvert P, Carrié A, Tardieu M, Chelly J, Beldjord C, Bienvenu T. Parental origin of de novo MECP2 mutations in Rett syndrome. Eur J Hum Genet 2001; 9:231-6. [PMID: 11313764 DOI: 10.1038/sj.ejhg.5200618] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2000] [Revised: 11/22/2000] [Accepted: 11/27/2000] [Indexed: 11/08/2022] Open
Abstract
Rett syndrome (RTT) is a neurodevelopmental disorder occurring almost exclusively in females as sporadic cases. Recently, DNA mutations in the MECP2 gene have been detected in approximately 70% of patients with RTT. To explain the sex-limited expression of RTT, it has been suggested that de novo X-linked mutations occur exclusively in male germ cells resulting therefore only in affected daughters. To test this hypothesis, we have analysed 19 families with RTT syndrome due to MECP2 molecular defects. In seven informative families we have found by DHPLC a nucleotide variant which could be used to differentiate between the maternal and the paternal allele. In each subject investigated from these families, we have amplified specifically each allele and sequenced allele-specific PCR products to identify the allele bearing the mutation as well as the parental origin of each X chromosome. This approach allowed us to determine the parental origin of de novo mutations in all informative families. In five cases, the de novo MECP2 mutations have a paternal origin and in the two other cases a maternal origin. In all transitions at CpG, the de novo mutation observed was of paternal origin. The high frequency of male germ-line transmission of the mutation (71% of RTT informative cases) is consistent with a predominant occurrence of the disease in females.
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Affiliation(s)
- M Girard
- Laboratoire de Génétique et Physiopathologie des retards mentaux-ICGM, Faculté de Médecine Cochin, 24 rue du Faubourg Saint Jacques, 75014 Paris, France
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31
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Bienvenu T, des Portes V, McDonell N, Carrié A, Zemni R, Couvert P, Ropers HH, Moraine C, van Bokhoven H, Fryns JP, Allen K, Walsh CA, Boué J, Kahn A, Chelly J, Beldjord C. Missense mutation in PAK3, R67C, causes X-linked nonspecific mental retardation. Am J Med Genet 2000; 93:294-8. [PMID: 10946356 DOI: 10.1002/1096-8628(20000814)93:4<294::aid-ajmg8>3.0.co;2-f] [Citation(s) in RCA: 111] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
X-linked mental retardation is a very common condition that affects approximately 1 in 600 males. Despite recent progress, in most cases the molecular defects underlying this disorder remain unknown. Recently, a study using the candidate gene approach demonstrated the presence of mutations in PAK3 (p21-activating kinase) associated with nonspecific mental retardation. PAK3 is a member of the larger family of PAK genes. PAK proteins have been implicated as critical downstream effectors that link Rho-GTPases to the actin cytoskeleton and to MAP kinase cascades, including the c-Jun amino-terminal kinase (JNK) and p38. We screened 12 MRX pedigrees that map to a large region overlying Xq21-q24. Mutation screening of the whole coding region of the PAK3 gene was performed by using a combination of denaturing gradient gel electrophoresis and direct sequencing. We have identified a novel missense mutation in exon 2 of PAK3 gene (R67C) in MRX47. This confirms the involvement of PAK3 in MRX following the report of a nonsense mutation recently reported in MRX30. In the MRX47 family, all affected males show moderate to severe mental retardation. No seizures, statural growth deficiency, or minor facial or other abnormal physical features were observed. This mutation R67C is located in a conserved polybasic domain (AA 66-68) of the protein that is predicted to play a major role in the GTPases binding and stimulation of Pak activity.
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Affiliation(s)
- T Bienvenu
- Institut National de la Santé et de la Recherche Médicale U129-ICGM, Faculté de Médecine Cochin, Paris, France.
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32
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Laradi S, Haj Khelil A, Omri H, Chaieb A, Mahjoub T, Benlimam H, Amri F, Saad A, Miled A, Leturcq F, Ben Chibani J, Beldjord C. [Molecular analysis and prenatal diagnosis of beta-thalassemia: about our experience in central Tunisia]. Ann Biol Clin (Paris) 2000; 58:453-60. [PMID: 10932046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
Beta-thalassemia, by its high frequency and its heterogeneity, constitutes a real problem of health in Tunisia. Prenatal diagnosis by DNA analysis represents the only reality for couples at risk. The denaturant gradient (urea and formamide) on polyacrylamide gel electrophoresis has been performed in our laboratory, using psoralen as chemical clamps. This method is simple, reliable, safe, rapid, without radioactivity and has a reasonable cost (chemical clamps). Even if it needs an informatic modelization in other laboratories, this method seems to be adapted to our economic and work conditions and to the molecular heterogeneity of the Tunisian beta-thalassemia. We present the results of an epidemiological molecular study on 75 patients with beta-thalassemia and the results of ten prenatal diagnosis. The molecular lesions codon 39 (C-T) and IVS1 nt2 (T-G) are the most frequent in our study. This technical approach provides genetic counselling for at risk families by offering prenatal diagnosis (reducing as possible the cost and the delay of the result) after prealable family study and identification of the mutation(s).
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Affiliation(s)
- S Laradi
- Laboratoire de biochimie, CHU F.-Hached, Sousse, Tunisie
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33
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Bienvenu T, Carrié A, de Roux N, Vinet MC, Jonveaux P, Couvert P, Villard L, Arzimanoglou A, Beldjord C, Fontes M, Tardieu M, Chelly J. MECP2 mutations account for most cases of typical forms of Rett syndrome. Hum Mol Genet 2000; 9:1377-84. [PMID: 10814719 DOI: 10.1093/hmg/9.9.1377] [Citation(s) in RCA: 218] [Impact Index Per Article: 9.1] [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: 11/12/2022] Open
Abstract
Rett syndrome (RTT) is a severe progressive neurological disorder that affects almost exclusively females, with an estimated prevalence of approximately one in 10 000-15 000 female births. Most cases are sporadic, but several reports about familial recurrence support X-linked dominant inheritance with male lethality. The gene responsible for this disorder, MECP2, was recently identified by candidate gene strategy. Mutations were detected in <25% of RTT cases in this first report. To characterize the spectrum of mutations in the MECP2 gene in RTT patients, we selected 46 typical RTT patients and performed mutation screening by denaturing gradient gel electrophoresis combined with direct sequencing. We identified 30 mutations, accounting for 65% of RTT patients. They include 12 novel mutations (11 located in exon 3 and one in exon 2). Mutations, such as R270X and frameshift deletions in a (CCACC) (n) rich region, have been found with multiple recurrences. Most of the mutations were de novo, except in one family where the non-affected transmitter mother exhibited a bias of X inactivation. Although this study showed that MECP2 mutations account for most cases of typical forms of RTT (65%) and mutations in non-coding regions cannot be excluded for the remaining cases, an alternative hypothesis that takes into account the homogeneous phenotype and exclusive involvement of females, could be the implication in RTT of a putative second X-linked gene.
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Affiliation(s)
- T Bienvenu
- Laboratoire de Génétique et Physiopathologie des retards mentaux-ICGM, Faculté de Médecine Cochin, 24 rue du Faubourg Saint Jacques, 75014 Paris, France
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34
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Affiliation(s)
- V Des Portes
- Service de neuropédiatrie, hôpital Saint-Vincent-de-Paul, Paris, France
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35
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Lucas H, Patrat C, Jouannet P, Beldjord C, Bienvenu T. A novel, rapid, and accurate method for detecting microdeletion involving the DAZ gene in infertile men. Fertil Steril 2000; 73:242-7. [PMID: 10685522 DOI: 10.1016/s0015-0282(99)00504-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 10/17/2022]
Abstract
OBJECTIVE To report on a novel, accurate method for detecting microdeletion involving the DAZ gene in infertile men. DESIGN Retrospective clinical study. SETTING University Infertility Center of Cochin Hospital, Paris, France. PATIENT(S) Infertile patients (n = 25) consulting our infertility department during 1998. The patient cohort included subjects with nonobstructive azoospermia and oligoasthenospermia. INTERVENTION(S) Blood samples were collected from each subject. MAIN OUTCOME MEASURE(S) DNA analysis using polymerase chain reaction (PCR)-denaturing gradient gel electrophoresis (DGGE). RESULT(S) We used a new molecular genetic strategy to rapidly identify deletions of the Y chromosome that include the DAZ locus. The experiment consists of amplifying simultaneously exon 4 of the DAZ and DAZLA genes with the use of specific primers that are complementary to intronic sequences of these genes. DGGE was used to separate the two PCR products, with good resolution. In infertile men with a microdeletion of the DAZ gene, this method allows amplification of an internal control when a deletion of that portion of the Yq chromosome is observed on a single amplification. CONCLUSION(S) This PCR-DGGE method for detection of DAZ gene deletion is simple and fast and does not require the use of radioactive elements. Compared with the classic PCR approach, this new method allows the amplification of the DAZLA copy to be used as an effective internal control in infertile men with microdeletion of the DAZ locus. This procedure could be particularly useful in screening for the DAZ locus in the diagnostic workup of nonobstructive azoospermia and severe oligoasthenoteratozoospermia.
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Affiliation(s)
- H Lucas
- Service d'Histo-Embryologie, Biologie de la Reproduction, Hôpital Cochin, Paris, France
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36
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Zemni R, Bienvenu T, Vinet MC, Sefiani A, Carrié A, Billuart P, McDonell N, Couvert P, Francis F, Chafey P, Fauchereau F, Friocourt G, des Portes V, Cardona A, Frints S, Meindl A, Brandau O, Ronce N, Moraine C, van Bokhoven H, Ropers HH, Sudbrak R, Kahn A, Fryns JP, Beldjord C, Chelly J. A new gene involved in X-linked mental retardation identified by analysis of an X;2 balanced translocation. Nat Genet 2000; 24:167-70. [PMID: 10655063 DOI: 10.1038/72829] [Citation(s) in RCA: 169] [Impact Index Per Article: 7.0] [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: 11/08/2022]
Abstract
X-linked forms of mental retardation (MR) affect approximately 1 in 600 males and are likely to be highly heterogeneous. They can be categorized into syndromic (MRXS) and nonspecific (MRX) forms. In MRX forms, affected patients have no distinctive clinical or biochemical features. At least five MRX genes have been identified by positional cloning, but each accounts for only 0.5%-1.0% of MRX cases. Here we show that the gene TM4SF2 at Xp11.4 is inactivated by the X breakpoint of an X;2 balanced translocation in a patient with MR. Further investigation led to identification of TM4SF2 mutations in 2 of 33 other MRX families. RNA in situ hybridization showed that TM4SF2 is highly expressed in the central nervous system, including the cerebral cortex and hippocampus. TM4SF2 encodes a member of the tetraspanin family of proteins, which are known to contribute in molecular complexes including beta-1 integrins. We speculate that through this interaction, TM4SF2 might have a role in the control of neurite outgrowth.
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Affiliation(s)
- R Zemni
- INSERM Unité 129 - ICGM, CHU Cochin, Paris, France
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37
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Bienvenu T, Bousquet S, Vidaud D, Hubert D, Francoual C, Beldjord C, Kaplan JC. A novel missense mutation D513G in exon 10 of the cystic fibrosis transmembrane conductance regulator (CFTR) gene identified in a French CBAVD patient. Mutations in brief no. 175. Online. Hum Mutat 2000; 12:213-4. [PMID: 10651488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
Congenital bilateal absence of the vas deferens (CBAVD) with obstructive azoospermia is a congenital reproductive disorder that affects one in 10000 male individuals. The observation that many men presenting with CBAVD have mutations in their CFTR genes had led to the proposal that CBAVD may be a primary genital form of cystic fibrosis. We report here one novel mutation located in exon 10 of the CFTR gene. This mutation, named D513G (A-->G at position 1670), has been found in one of 83 patients with CBAVD from France, the analysis of exon 10 using a chemical clamp DGGE assay allowed us to identify three CF mutations AEF508 (37/166; 22%), AE1507 (1/166; 0/6%) and D513G (1/166; 0.6%), and two variants M470V and E528E (1716 G>A). The novel D513G mutation has not been found in more than 200 non-CF chromosomes and in a sample of 300 CF chromosomes from French classical CF patients.
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Affiliation(s)
- T Bienvenu
- Laboratoire de Biochimie et Génétique Moléculaire, CHU Cochin, 123 bld Port-Royal, 75014 Paris, France.
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38
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Billuart P, Chelly J, Carrié A, Vinet M, Couvert P, McDonell N, Zemni R, Kahn A, Moraine C, Beldjord C, Bienvenu T. Determination of the gene structure of human oligophrenin-1 and identification of three novel polymorphisms by screening of DNA from 164 patients with non-specific X-linked mental retardation. Ann Genet 2000; 43:5-9. [PMID: 10818214 DOI: 10.1016/s0003-3995(00)00015-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have recently shown that mutations in oligophrenin-1 (OPHN1) are responsible for non-specific X-linked mental retardation (MRX). The structure of the gene encoding the OPHN1 protein was determined by isolation of genomic DNA clones from the human cosmid library. Genomic fragments containing exons were sequenced, and the sequences of the exons and flanking introns were defined. Knowledge of the genomic structure of the OPHN1 gene, which spans at least 500 kb and consists of 25 exons, will facilitate the search for additional mutations in OPHN1. OPHN1 was screened for mutations in 164 subjects with non-specific mental retardation. Three nucleotide substitutions were identified, one of which was a silent mutation in the codon threonine 301 at position 903 (G-->C). The other substitutions were located in exon 2, a G-->A substitution at position 133 (A45T), and in exon 10, a C-->T substitution at position 902 (T301M), but these are common polymorphisms rather than disease-causing mutations.
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Affiliation(s)
- P Billuart
- Inserm U129-ICGM, faculté de médecine Cochin, 27, rue du Faubourg Saint Jacques, 75014, Paris, France
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39
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Bienvenu T, Bousquet S, Souville I, Beldjord C. [Interference of P1290 P polymorphism (4002 A--> G) in molecular diagnosis of mucoviscidosis using the cystic fibrosis assay: an example of a diagnostic trap]. Ann Biol Clin (Paris) 1999; 57:741-2. [PMID: 10572229] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Affiliation(s)
- T Bienvenu
- Laboratoire de biochimie et de génétique moléculaire, Hôpital Cochin, 123, boulevard de Port-Royal, 75014 Paris
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40
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Carrié A, Jun L, Bienvenu T, Vinet MC, McDonell N, Couvert P, Zemni R, Cardona A, Van Buggenhout G, Frints S, Hamel B, Moraine C, Ropers HH, Strom T, Howell GR, Whittaker A, Ross MT, Kahn A, Fryns JP, Beldjord C, Marynen P, Chelly J. A new member of the IL-1 receptor family highly expressed in hippocampus and involved in X-linked mental retardation. Nat Genet 1999; 23:25-31. [PMID: 10471494 DOI: 10.1038/12623] [Citation(s) in RCA: 214] [Impact Index Per Article: 8.6] [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: 11/08/2022]
Abstract
We demonstrate here the importance of interleukin signalling pathways in cognitive function and the normal physiology of the CNS. Thorough investigation of an MRX critical region in Xp22.1-21.3 enabled us to identify a new gene expressed in brain that is responsible for a non-specific form of X-linked mental retardation. This gene encodes a 696 amino acid protein that has homology to IL-1 receptor accessory proteins. Non-overlapping deletions and a nonsense mutation in this gene were identified in patients with cognitive impairment only. Its high level of expression in post-natal brain structures involved in the hippocampal memory system suggests a specialized role for this new gene in the physiological processes underlying memory and learning abilities.
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Affiliation(s)
- A Carrié
- INSERM Unité 129-ICGM, CHU Cochin, 24 Rue du Faubourg Saint Jacques, 75014 Paris, France
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41
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des Portes V, Beldjord C, Chelly J, Hamel B, Kremer H, Smits A, van Bokhoven H, Ropers HH, Claes S, Fryns JP, Ronce N, Gendrot C, Toutain A, Raynaud M, Moraine C. X-linked nonspecific mental retardation (MRX) linkage studies in 25 unrelated families: the European XLMR consortium. Am J Med Genet 1999; 85:263-5. [PMID: 10398240 DOI: 10.1002/(sici)1096-8628(19990730)85:3<263::aid-ajmg15>3.0.co;2-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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42
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Jemaa LB, des Portes V, Zemni R, Mrad R, Maazoul F, Beldjord C, Chaabouni H, Chelly J. Refined 2.7 centimorgan locus in Xp21.3-22.1 for a nonspecific X-linked mental retardation gene (MRX54). Am J Med Genet 1999; 85:276-82. [PMID: 10398243 DOI: 10.1002/(sici)1096-8628(19990730)85:3<276::aid-ajmg18>3.0.co;2-i] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Nonspecific X-linked mental retardation (MRX) is a heterogeneous condition in which mental retardation (MR) appears to be the only consistent manifestation. A large genetic interval of assignment obtained on individual families by linkage analysis, genetic, heterogeneity, and phenotypic variability usually are major obstacles to fine-map and identify the related disease genes. Here we report on a large Tunisian family (MRX54) with an MRX condition. X-linked recessive inheritance is strongly suggested by the segregation of MR through seven unaffected carrier females to 14 affected males in two generations. Two-point linkage analysis demonstrated significant linkage between the disorder and several markers in Xp21.3-22.1 (maximum LOD score Zmax = 3.56, recombination fraction 0 = 0 at DXS1202), which was confirmed by multipoint linkage analyses. Recombinant events observed with the flanking markers DXS989 and DXS1218 delineate a refined locus of approximately 2.7 cM in accordance with the physical distance between these two markers. The small interval of assignment observed in this family overlaps not only with nine large MRX loci previously reported in Xp21.3-22.1 but also with two inherited microdeletions in Xp21.3-22.1 involved in nonspecific MR. Although the involvement of several genes located in the Xp21.3-22.1 region cannot be ruled out, data reported in this study could be used as a starting point for the search of such gene(s).
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Affiliation(s)
- L B Jemaa
- Service des Maladies congénitales et héréditaires, Hôpital Charles Nicolle, Tunis, Tunisie
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43
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Carrié A, Nepotes V, Billuart P, Beldjord C, Bienvenu T, Chelly J, Bruls T, Heilig R, Weissenbach J, Jun L, Marynen P. Construction of a highly annotated cosmid contig spanning 550Kb within the X-linked nonspecific mental retardation candidate region at Xp21.3-22.1. Am J Med Genet 1999; 85:252-4. [PMID: 10398238 DOI: 10.1002/(sici)1096-8628(19990730)85:3<252::aid-ajmg13>3.0.co;2-a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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44
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Rodriguez-Macias KA, Thibaud E, Houang M, Duflos C, Beldjord C, Rappaport R. Follow up of precocious pseudopuberty associated with isolated ovarian follicular cysts. Arch Dis Child 1999; 81:53-6. [PMID: 10373136 PMCID: PMC1717969 DOI: 10.1136/adc.81.1.53] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The clinical outcomes of seven girls presenting with pseudosexual precocity caused by isolated autonomous ovarian follicular cysts are presented. Six of the seven girls, aged 11 months to 6.9 years, had a unilateral ovarian cyst detected by ultrasound at the first acute episode. Plasma oestradiol was raised in only five of the cases, but all had a low response to luteinising hormone releasing hormone stimulation. Follow up lasted for up to eight years with recurrent episodes of variable frequency and severity in all seven patients. Evidence of McCune-Albright syndrome appeared later in only three patients. It could not be predicted from the initial symptoms or the clinical course. Mutations of the G(s)alpha protein leading to activation were investigated in the lymphocytes and ovarian and bone tissues of four patients. Only one patient showed a mutation in bone tissue. Close follow up with repeated searches for skeletal lesions remains necessary since the distribution of somatic mutations cannot be assessed by molecular studies. Most patients with recurrent ovarian cysts require a conservative approach.
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Affiliation(s)
- K A Rodriguez-Macias
- Pediatric Endocrinology Unit, Hôpital des Enfants Malades, 149 rue de Sèvres, 75015 Paris, France
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45
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Steffann J, Vidaud D, Bousquet S, Jullien M, Ninot A, Kaplan JC, Beldjord C, Bienvenu T. Novel double mutant CF allele identified in a cystic fibrosis patient with meconium ileus. Ann Genet 1999; 41:213-5. [PMID: 9881185] [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] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Affiliation(s)
- J Steffann
- Laboratoire de Biochimie et Génétique Moléculaire, Hôpital Cochin, Paris, France
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46
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Cartault F, Steffann J, Vidaud D, Bousquet S, Lesure F, Renouil M, McDonell N, Feingold J, Beldjord C, Bienvenu T. Detection of more than 91% cystic fibrosis mutations in a sample of the population from Reunion Island and identification of two novel mutations (A309G, S1255L) and one novel polymorphism (L49L). Clin Genet 1998; 54:437-9. [PMID: 9842999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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47
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Billuart P, Bienvenu T, Ronce N, des Portes V, Vinet MC, Zemni R, Carrié A, Beldjord C, Kahn A, Moraine C, Chelly J. Oligophrenin 1 encodes a rho-GAP protein involved in X-linked mental retardation. Pathol Biol (Paris) 1998; 46:678. [PMID: 9885813] [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] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Affiliation(s)
- P Billuart
- INSERM U129-ICGM, Faculté de Médecine Cochin, Paris
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de Keyzer Y, René P, Beldjord C, Lenne F, Bertagna X. Overexpression of vasopressin (V3) and corticotrophin-releasing hormone receptor genes in corticotroph tumours. Clin Endocrinol (Oxf) 1998; 49:475-82. [PMID: 9876345 DOI: 10.1046/j.1365-2265.1998.00560.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE The molecular mechanisms underlying ACTH-secreting tumour formation remain unknown. Transmembrane signalling pathways play an important role in several endocrine disorders including pituitary tumours. To investigate the role of the pituitary vasopressin (V3) receptor (R) in ACTH-secreting tumours we have qualitatively and quantitatively analysed its mRNA. DESIGN RT-PCR, denaturing gradient gel electrophoresis and S1 nuclease protection experiments were used to analyse V3 mRNA structure in ACTH-secreting tumours. We also developed a competitive RT-PCR system to compare the levels of expression of POMC, V3 and CRH-R genes. This system used as competitor a single mutant template (termed multi-mutant) containing primers for the three genes flanking an unrelated core sequence allowing multiple quantifications from the same cDNA preparations. We analysed 12 normal pituitaries, 15 corticotroph pituitary adenomas and 6 ACTH-secreting bronchial carcinoids. RESULTS The V3 mRNA structure and sequence were found to be identical in normal and tumoural pituitary indicating that the tumoural Vs mRNA codes for a normal receptor. POMC RT-PCR signals in the pituitary tumour group were approximately 7-fold higher than in the normal pituitary group. Similarly, V3 and CRH-R signal were increased in pituitary tumors (mean +/- SEM: 5.87 x 10(-6) +/- 1.73 x 10(-6), and 2.33 x 10(-4) +/- 1.4 x 10(-4), respectively), when compared to normal pituitaries (1.19 x 10(-7) +/- 2.39 x 10(-8), and 1.7 x 10(-6) +/- 4.65 x 10(-7), respectively) suggesting that these two genes are expressed at very high levels in corticotroph tumours. When expressed relative to the corresponding POMC signals, increases in V3 and CRH-R signals reached 49-fold and 137-fold, respectively, in pituitary tumours. In ACTH-secreting bronchial carcinoids V3 gene expression level was also higher than in normal pituitary, whereas CRH-R signals were detected in only 4 of the 6 tumours with wide variations. CONCLUSION Our results show that both vasopressin and CRH receptor genes are overexpressed in ACTH-secreting pituitary tumours. They suggest that overexpression of G protein-coupled receptors may be an additional mechanism through which membrane receptors may play a role in human tumours.
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Affiliation(s)
- Y de Keyzer
- Groupe d'Etudes en Physiopathologie Endocrinienne, Université René Descartes, Paris, France
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49
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Des Portes V, Pinard JM, Francis F, Vinet MC, Koulakoff A, Motte J, Catala M, Beldjord C, Chelly J. Identification du gène XLIS, codant pour la doublecortine et impliqué dans les hétérotopies laminaires sous-corticales et les lissencéphalies liées à l'X. Arch Pediatr 1998. [DOI: 10.1016/s0929-693x(99)80031-1] [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: 11/30/2022]
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50
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Bienvenu T, des Portes V, Saint Martin A, McDonell N, Billuart P, Carrié A, Vinet MC, Couvert P, Toniolo D, Ropers HH, Moraine C, van Bokhoven H, Fryns JP, Kahn A, Beldjord C, Chelly J. Non-specific X-linked semidominant mental retardation by mutations in a Rab GDP-dissociation inhibitor. Hum Mol Genet 1998; 7:1311-5. [PMID: 9668174 DOI: 10.1093/hmg/7.8.1311] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.1] [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: 11/13/2022] Open
Abstract
Non-specific X-linked mental retardation (MRX) is a very common disorder which affects approximately 1 in 600 males. Despite this high frequency, little is known about the molecular defects underlying this disorder, mainly because of the clinical and genetic heterogeneity which is evident from linkage studies. Recently, a collaborative study using the candidate gene approach demonstrated the presence of mutations in GDIalpha, a Rab GDP-dissociation inhibitor encoded by a gene localized in Xq28, associated with non-specific mental retardation. GDIalpha is mainly a brain-specific protein that plays a critical role in the recycling of Rab GTPases involved in membrane vesicular transport. The study presented here was designed to assess the prevalence of mutations in the GDIalpha in mentally retarded patients and to discuss the clinical phenotypes observed in affected individuals. Mutation screening of the whole coding region of the GDIalpha gene, using a combination of denaturing gradient gel electrophoresis and direct sequencing, was carried out in 164 patients found negative for expansions across the FRAXA GCC repeat. In addition to the nonsense mutation recently reported in MRX48, we have identified a novel missense mutation in exon 11 of the GDIalpha gene in one familial form of non-specific mental retardation. In this family (family R), all affected males show moderate to severe mental retardation, and the X-linked semidominant inheritance is strongly suggested by the severe phenotypes in males with respect to mildly affected females or unaffected obligatory carriers. This study showed that the prevalence of GDIalpha mutations in non-specific mental retardation could be estimated to be 0.5-1%, and molecular diagnosis and genetic counselling in some cases of non-specific mental handicap can now be provided.
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Affiliation(s)
- T Bienvenu
- INSERM U129, Institut Cochin de Génétique Moléculaire, 24 rue du Faubourg Saint-Jacques, 75014 Paris, France.
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