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A pseudoautosomal glycosylation disorder prompts the revision of dolichol biosynthesis

MP. Wilson, T. Kentache, CR. Althoff, C. Schulz, G. de Bettignies, G. Mateu Cabrera, L. Cimbalistiene, B. Burnyte, G. Yoon, G. Costain, S. Vuillaumier-Barrot, D. Cheillan, D. Rymen, L. Rychtarova, H. Hansikova, M. Bury, JP. Dewulf, F. Caligiore,...

. 2024 ; 187 (14) : 3585-3601.e22. [pub] 20240530

Language English Country United States

Document type Journal Article

Dolichol is a lipid critical for N-glycosylation as a carrier for activated sugars and nascent oligosaccharides. It is commonly thought to be directly produced from polyprenol by the enzyme SRD5A3. Instead, we found that dolichol synthesis requires a three-step detour involving additional metabolites, where SRD5A3 catalyzes only the second reaction. The first and third steps are performed by DHRSX, whose gene resides on the pseudoautosomal regions of the X and Y chromosomes. Accordingly, we report a pseudoautosomal-recessive disease presenting as a congenital disorder of glycosylation in patients with missense variants in DHRSX (DHRSX-CDG). Of note, DHRSX has a unique dual substrate and cofactor specificity, allowing it to act as a NAD+-dependent dehydrogenase and as a NADPH-dependent reductase in two non-consecutive steps. Thus, our work reveals unexpected complexity in the terminal steps of dolichol biosynthesis. Furthermore, we provide insights into the mechanism by which dolichol metabolism defects contribute to disease.

AP HP Biochimie Métabolique et Cellulaire and Département de Génétique Hôpital Bichat Claude Bernard and Université de Paris Faculté de Médecine Xavier Bichat INSERM U1149 CRI Paris France

Department of Molecular Genetics University of Toronto Toronto ON Canada

Department of Paediatrics University of Toronto Toronto ON Canada

Department of Pediatrics Center for Metabolic Diseases University Hospitals Leuven Leuven Belgium

Developmental Brain Disorders Laboratory Université Paris Cité INSERM UMR1163 Imagine Institute Paris France

Division of Clinical and Metabolic Genetics Hospital for Sick Children Toronto ON Canada

Division of Neurology Hospital for Sick Children Toronto ON Canada

Institute of Biomedical Sciences Faculty of Medicine Vilnius University Vilnius Lithuania

Laboratoire Carmen Inserm U1060 INRAE UMR1397 Université Claude Bernard Lyon 1 Lyon France

Laboratory for Molecular Diagnosis Center for Human Genetics KU Leuven Leuven Belgium

Laboratory for Study of Mitochondrial Disorders Department of Paediatrics and Inherited Metabolic Disorders 1st Faculty of Medicine and General University Hospital Prague Charles University Prague Czechia

Metabolic Research Group de Duve Institute Université Catholique de Louvain Brussels Belgium

Program in Genetics and Genome Biology SickKids Research Institute Toronto ON Canada

Service Biochimie et Biologie Moléculaire Hospices Civils de Lyon

Univ Lille CNRS UMR 8576 UGSF Unité de Glycobiologie Structurale et Fonctionnelle 59000 Lille France

WELBIO Department WEL Research Institute Wavre Belgium

References provided by Crossref.org

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$a A pseudoautosomal glycosylation disorder prompts the revision of dolichol biosynthesis / $c MP. Wilson, T. Kentache, CR. Althoff, C. Schulz, G. de Bettignies, G. Mateu Cabrera, L. Cimbalistiene, B. Burnyte, G. Yoon, G. Costain, S. Vuillaumier-Barrot, D. Cheillan, D. Rymen, L. Rychtarova, H. Hansikova, M. Bury, JP. Dewulf, F. Caligiore, J. Jaeken, V. Cantagrel, E. Van Schaftingen, G. Matthijs, F. Foulquier, GT. Bommer
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$a Dolichol is a lipid critical for N-glycosylation as a carrier for activated sugars and nascent oligosaccharides. It is commonly thought to be directly produced from polyprenol by the enzyme SRD5A3. Instead, we found that dolichol synthesis requires a three-step detour involving additional metabolites, where SRD5A3 catalyzes only the second reaction. The first and third steps are performed by DHRSX, whose gene resides on the pseudoautosomal regions of the X and Y chromosomes. Accordingly, we report a pseudoautosomal-recessive disease presenting as a congenital disorder of glycosylation in patients with missense variants in DHRSX (DHRSX-CDG). Of note, DHRSX has a unique dual substrate and cofactor specificity, allowing it to act as a NAD+-dependent dehydrogenase and as a NADPH-dependent reductase in two non-consecutive steps. Thus, our work reveals unexpected complexity in the terminal steps of dolichol biosynthesis. Furthermore, we provide insights into the mechanism by which dolichol metabolism defects contribute to disease.
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$a Mateu Cabrera, Gisèle $u Laboratory for Molecular Diagnosis, Center for Human Genetics, KU Leuven, Leuven, Belgium
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$a Costain, Gregory $u Division of Clinical and Metabolic Genetics, Hospital for Sick Children, Toronto, ON, Canada; Department of Paediatrics, University of Toronto, Toronto, ON, Canada; Program in Genetics and Genome Biology, SickKids Research Institute, Toronto, ON, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
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$a Rymen, Daisy $u Department of Pediatrics, Center for Metabolic Diseases, University Hospitals Leuven, Leuven, Belgium
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$a Hansikova, Hana $u Laboratory for Study of Mitochondrial Disorders, Department of Paediatrics and Inherited Metabolic Disorders, First Faculty of Medicine and General University Hospital in Prague, Charles University, Prague, Czechia
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$a Bury, Marina $u Metabolic Research Group, de Duve Institute, Université Catholique de Louvain, Brussels, Belgium; WELBIO Department, WEL Research Institute, Wavre, Belgium
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$a Jaeken, Jaak $u Department of Pediatrics, Center for Metabolic Diseases, University Hospitals Leuven, Leuven, Belgium
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$a Cantagrel, Vincent $u Developmental Brain Disorders Laboratory, Université Paris Cité, INSERM UMR1163, Imagine Institute, Paris, France
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$a Bommer, Guido T $u Metabolic Research Group, de Duve Institute, Université Catholique de Louvain, Brussels, Belgium; WELBIO Department, WEL Research Institute, Wavre, Belgium. Electronic address: guido.bommer@uclouvain.be
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