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Biallelic loss of function variants in COASY cause prenatal onset pontocerebellar hypoplasia, microcephaly, and arthrogryposis. 2018

Tessa van Dijk, and Sacha Ferdinandusse, and Jos P N Ruiter, and Mariëlle Alders, and Inge B Mathijssen, and Jillian S Parboosingh, and A Micheil Innes, and Hanne Meijers-Heijboer, and Bwee Tien Poll-The, and Francois P Bernier, and Ronald J A Wanders, and Ryan E Lamont, and Frank Baas
Department of Clinical Genetics, Academic Medical Center, Amsterdam, The Netherlands.

Pontocerebellar hypoplasia (PCH) is a heterogeneous neurodegenerative disorder with a prenatal onset. Using whole-exome sequencing, we identified variants in the gene Coenzyme A (CoA) synthase (COASY) gene, an enzyme essential in CoA synthesis, in four individuals from two families with PCH, prenatal onset microcephaly, and arthrogryposis. In family 1, compound heterozygous variants were identified in COASY: c.[1549_1550delAG]; [1486-3 C>G]. In family 2, all three affected siblings were homozygous for the c.1486-3 C>G variant. In both families, the variants segregated with the phenotype. RNA analysis showed that the c.1486-3 C>G variant leads to skipping of exon 7 with partial retention of intron 7, disturbing the reading frame and resulting in a premature stop codon (p.(Ala496Ilefs*20)). No CoA synthase protein was detected in patient cells by immunoblot analysis and CoA synthase activity was virtually absent. Partial CoA synthase defects were previously described as a cause of COASY Protein-Associated Neurodegeneration (CoPAN), a type of Neurodegeneration and Brain Iron Accumulation (NBIA). Here we demonstrate that near complete loss of function variants in COASY are associated with lethal PCH and arthrogryposis.

UI MeSH Term Description Entries
D007231 Infant, Newborn An infant during the first 28 days after birth. Neonate,Newborns,Infants, Newborn,Neonates,Newborn,Newborn Infant,Newborn Infants
D008297 Male Males
D008831 Microcephaly A congenital abnormality in which the CEREBRUM is underdeveloped, the fontanels close prematurely, and, as a result, the head is small. (Desk Reference for Neuroscience, 2nd ed.) Microlissencephaly,Severe Congenital Microcephaly,Congenital Microcephalies, Severe,Congenital Microcephaly, Severe,Microcephalies,Microcephalies, Severe Congenital,Microcephaly, Severe Congenital,Microlissencephalies,Severe Congenital Microcephalies
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D002526 Cerebellar Diseases Diseases that affect the structure or function of the cerebellum. Cardinal manifestations of cerebellar dysfunction include dysmetria, GAIT ATAXIA, and MUSCLE HYPOTONIA. Cerebellar Dysfunction,Cerebellum Diseases,Cerebellar Disorders,Cerebellar Syndromes,Cerebellar Disease,Cerebellar Disorder,Cerebellar Dysfunctions,Cerebellar Syndrome,Cerebellum Disease,Disease, Cerebellar,Disease, Cerebellum,Disorder, Cerebellar,Dysfunction, Cerebellar,Syndrome, Cerebellar
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000073658 Loss of Function Mutation A mutation that causes a decrease in or elimination of a gene product's activity. Leaky Mutation,Null Mutation,Leaky Mutations,Mutation, Leaky,Mutation, Null,Mutations, Leaky,Mutations, Null,Null Mutations
D001176 Arthrogryposis Persistent flexure or contracture of a joint. Amyoplasia Congenita,Arthromyodysplasia, Congenital,Guerin-Stern Syndrome,Myodystrophia Fetalis Deformans,Arthrogryposis Multiplex Congenita,Arthrogryposis Multiplex Congenita (AMC),Congenital Arthromyodysplasia,Congenital Multiple Arthrogryposis,Fibrous Ankylosis of Multiple Joints,Guérin-Stern Syndrome,Otto Syndrome,Rocher-Sheldon Syndrome,Rossi Syndrome,Arthrogryposes,Arthrogryposes, Congenital Multiple,Arthrogryposis Multiplex Congenitas,Arthrogryposis Multiplex Congenitas (AMC),Arthrogryposis, Congenital Multiple,Arthromyodysplasias, Congenital,Congenita, Arthrogryposis Multiplex,Congenita, Arthrogryposis Multiplex (AMC),Congenital Arthromyodysplasias,Congenital Multiple Arthrogryposes,Congenitas, Arthrogryposis Multiplex,Congenitas, Arthrogryposis Multiplex (AMC),Guerin Stern Syndrome,Guérin Stern Syndrome,Multiple Arthrogryposes, Congenital,Multiple Arthrogryposis, Congenital,Multiplex Congenita, Arthrogryposis,Multiplex Congenita, Arthrogryposis (AMC),Multiplex Congenitas, Arthrogryposis,Multiplex Congenitas, Arthrogryposis (AMC),Rocher Sheldon Syndrome,Syndrome, Guerin-Stern,Syndrome, Guérin-Stern,Syndrome, Otto,Syndrome, Rocher-Sheldon,Syndrome, Rossi
D013577 Syndrome A characteristic symptom complex. Symptom Cluster,Cluster, Symptom,Clusters, Symptom,Symptom Clusters,Syndromes
D014166 Transferases Transferases are enzymes transferring a group, for example, the methyl group or a glycosyl group, from one compound (generally regarded as donor) to another compound (generally regarded as acceptor). The classification is based on the scheme "donor:acceptor group transferase". (Enzyme Nomenclature, 1992) EC 2. Transferase

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