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Congenital Diarrhea and Cholestatic Liver Disease: Phenotypic Spectrum Associated with MYO5B Mutations

D. Aldrian, GF. Vogel, TK. Frey, H. Ayyıldız Civan, AÜ. Aksu, Y. Avitzur, E. Ramos Boluda, M. Çakır, AM. Demir, C. Deppisch, HC. Duba, G. Düker, P. Gerner, J. Hertecant, J. Hornová, S. Kathemann, J. Koeglmeier, A. Koutroumpa, R. Lanzersdorfer, R....

. 2021 ; 10 (3) : . [pub] 20210128

Language English Country Switzerland

Document type Journal Article

Grant support
16678 Oesterreichische Nationalbank
18019 Oesterreichische Nationalbank
0404/2386 Tiroler Wissenschaftsförderung

Myosin Vb (MYO5B) is a motor protein that facilitates protein trafficking and recycling in polarized cells by RAB11- and RAB8-dependent mechanisms. Biallelic MYO5B mutations are identified in the majority of patients with microvillus inclusion disease (MVID). MVID is an intractable diarrhea of infantile onset with characteristic histopathologic findings that requires life-long parenteral nutrition or intestinal transplantation. A large number of such patients eventually develop cholestatic liver disease. Bi-allelic MYO5B mutations are also identified in a subset of patients with predominant early-onset cholestatic liver disease. We present here the compilation of 114 patients with disease-causing MYO5B genotypes, including 44 novel patients as well as 35 novel MYO5B mutations, and an analysis of MYO5B mutations with regard to functional consequences. Our data support the concept that (1) a complete lack of MYO5B protein or early MYO5B truncation causes predominant intestinal disease (MYO5B-MVID), (2) the expression of full-length mutant MYO5B proteins with residual function causes predominant cholestatic liver disease (MYO5B-PFIC), and (3) the expression of mutant MYO5B proteins without residual function causes both intestinal and hepatic disease (MYO5B-MIXED). Genotype-phenotype data are deposited in the existing open MYO5B database in order to improve disease diagnosis, prognosis, and genetic counseling.

1st Department of Pediatrics Athens University Medical School 11527 Athens Greece

Aghia Sofia Children's Hospital Neonatal Intensive Care Unit B 115 27 Athens Greece

Ankara Child Health and Diseases Training and Research Hospital Neonatology 06120 Ankara Turkey

Ankara Child Health and Diseases Training and Research Hospital Pediatric Gastroenterology 06130 Ankara Turkey

Assistance Publique Hôpitaux de Paris Hôpital Universitaire Necker Enfants Malades Service de Gastroentérologie Hépatologie et Nutrition Pédiatrique 149 Rue de Sèvres 75015 Paris France

Austrian Drug Screening Institute ADSI 6020 Innsbruck Austria

Children's Hospital Tübingen 72076 Tübingen Germany

Department for Pediatric Gastroenterology and Hepatology University Children's Hospital Bonn 53127 Bonn Germany

Department for Pediatric Nephrology Gastroenterology Endocrinology and Transplant Medicine Clinic for Pediatrics 2 University Children's Hospital Essen University Duisburg Essen 45147 Essen Germany

Department of Medical Genetics Kepler University Hospital School of Medicine Johannes Kepler University A 4020 Linz Austria

Department of Neonatology Johannes Kepler University Linz A 4020 Linz Austria

Department of Paediatric Gastroenterology Unit of Nutrition and Intestinal Failure Rehabilitation Great Ormond Street Hospital for Sick Children NHS Foundation Trust Great Ormond Street London WC1N 3JH UK

Department of Paediatrics and Adolescent Medicine Johannes Kepler University Linz A 4020 Linz Austria

Department of Paediatrics Helios Medical Centre Wuppertal Witten Herdecke University 58455 Witten Germany

Department of Pediatric Gastroenterology Hepatology and Nutrition Health Science University Sadi Konuk Education and Research Hospital 34147 Istanbul Turkey

Department of Pediatric Sheikh Khalifa Medical City College of Medicine and Health Sciences Khalife University Abu Dhabi 127788 United Arab Emirates

Department of Pediatrics 1 Medical University of Innsbruck A 6020 Innsbruck Austria

Department of Pediatrics and Adolescent Medicine Faculty of Medicine Medical Center University of Freiburg 79106 Freiburg Germany

Department of Pediatrics and Adolescent Medicine University Medical Center Ulm Eythstr 24 89075 Ulm Germany

Department of Pediatrics Faculty of Medicine Comenius University National Institute of Children Diseases 814 99 Bratislava Slovakia

Department of Pediatrics University of Oxford Oxford OX3 9DU UK

Departments of Pediatric Gastroenterology Hepatology and Nutrition Faculty of Medicine Karadeniz Technical University 61080 Trabzon Turkey

Division of Cell Biology Biocenter Innsbruck Medical University A 6020 Innsbruck Austria

Division of Cell Biology Medical University of Innsbruck A 6020 Innsbruck Austria

Division of Gastroenterology Hepatology and Nutrition The Hospital for Sick Children Toronto ON M5G 0A4 Canada

Division of Human Genetics Medical University of Innsbruck A 6020 Innsbruck Austria

Emma Children's Hospital AMC 1105 Amsterdam The Netherlands

Genetics Metabolics Service Tawam Hospital Al Ain 15258 United Arab Emirates

Hospital Universitario San Vicente de Paúl Medellín Antioquia 50022 Colombia

Institute of Histology and Embryology Medical University of Innsbruck A 6020 Innsbruck Austria

Intestinal Rehabilitation Unit Pediatric Gastroenterology and Nutrition Unit University Hospital La Paz 28046 Madrid Spain

Paediatrics at the Medical Faculty Université de Paris 75005 Paris France

Pediatric Gastroenterology Department of Pediatrics Faculty of Medicine in Hradec Králové Charles University 110 00 Prague Czech Republic

Pediatric Gastroenterology Shaare Zedek Medical Center 9103102 Jerusalem Israel

SW Thames Regional Genetics Service St George's University NHS Foundation Trust London SW17 0QT UK

Translational Gastroenterology Unit University of Oxford Oxford OX3 9DU UK

Unidade de Gastrenterologia Pediátrica Centro Hospitalar do Porto 4099 001 Porto Portugal

Universitätsklinik für Kinder und Jugendmedizin Tübingen Pädiatrische Gastroenterologie und Hepatologie Hoppe Seyler Straße 1 72076 Tübingen Germany

University of Health Sciences Sami Ulus Maternity and Child Health and Diseases Training and Research Hospital 06120 Ankara Turkey

References provided by Crossref.org

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$a Myosin Vb (MYO5B) is a motor protein that facilitates protein trafficking and recycling in polarized cells by RAB11- and RAB8-dependent mechanisms. Biallelic MYO5B mutations are identified in the majority of patients with microvillus inclusion disease (MVID). MVID is an intractable diarrhea of infantile onset with characteristic histopathologic findings that requires life-long parenteral nutrition or intestinal transplantation. A large number of such patients eventually develop cholestatic liver disease. Bi-allelic MYO5B mutations are also identified in a subset of patients with predominant early-onset cholestatic liver disease. We present here the compilation of 114 patients with disease-causing MYO5B genotypes, including 44 novel patients as well as 35 novel MYO5B mutations, and an analysis of MYO5B mutations with regard to functional consequences. Our data support the concept that (1) a complete lack of MYO5B protein or early MYO5B truncation causes predominant intestinal disease (MYO5B-MVID), (2) the expression of full-length mutant MYO5B proteins with residual function causes predominant cholestatic liver disease (MYO5B-PFIC), and (3) the expression of mutant MYO5B proteins without residual function causes both intestinal and hepatic disease (MYO5B-MIXED). Genotype-phenotype data are deposited in the existing open MYO5B database in order to improve disease diagnosis, prognosis, and genetic counseling.
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