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Masuda L, Hasegawa A, Kamura H, Hasegawa F, Yamamura M, Taniguchi K, Ito Y, Hata K, Samura O, Okamoto A. Missense BICD2 variants in fetuses with congenital arthrogryposis and pterygia. Hum Genome Var 2024; 11:32. [PMID: 39183348 PMCID: PMC11345410 DOI: 10.1038/s41439-024-00290-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2024] [Revised: 07/17/2024] [Accepted: 07/25/2024] [Indexed: 08/27/2024] Open
Abstract
Type 2 spinal muscular atrophy with lower extremity dominance (SMALED2) is caused by bicaudal D cargo adaptor 2 (BICD2) variants. However, the SMALED2 genotype and phenotype correlation have not been thoroughly characterized. We identified de novo heterozygous BICD2 missense variants in two fetuses with severe, prenatally diagnosed multiple arthrogryposis congenita. This report provides further insights into the genetics of this rare disease.
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Affiliation(s)
- Layla Masuda
- Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo, Japan.
| | - Akihiro Hasegawa
- Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo, Japan
| | - Hiromi Kamura
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - Fuyuki Hasegawa
- Center for Clinical Genetics, National Center for Child Health and Development, Tokyo, Japan
| | - Michihiro Yamamura
- Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo, Japan
| | - Kosuke Taniguchi
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo, Japan
- Department of Human Molecular Genetics, Gunma University Graduate School of Medicine, Gunma, Japan
| | - Yuki Ito
- Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo, Japan
| | - Kenichiro Hata
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo, Japan
- Department of Human Molecular Genetics, Gunma University Graduate School of Medicine, Gunma, Japan
| | - Osamu Samura
- Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo, Japan
| | - Aikou Okamoto
- Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo, Japan
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Elbert A, Dixon K, Shen Y, Hamilton S, Boerkoel CF, Jones SJ, Kanungo AK. Mitofusin 2 Variant Presenting With a Phenotype of Multiple System Atrophy of Cerebellar Subtype. Neurol Genet 2024; 10:e200114. [PMID: 38170145 PMCID: PMC10759145 DOI: 10.1212/nxg.0000000000200114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 11/01/2023] [Indexed: 01/05/2024]
Abstract
Objectives To investigate the etiology of cerebellar ataxia in an adult male patient. Methods We performed standard neurologic assessment and genome sequencing of a 62-year-old man with rapidly progressive balance and gait abnormalities. Results The propositus exhibited cognitive dysfunction, mild appendicular bradykinesia, prominent appendicular ataxia, dysarthria, and hypomimia with minimal dysautonomic symptoms. Nerve conduction studies showed mild peripheral sensory neuropathy and normal motor nerve conduction velocities. Brain imaging showed progressive cerebellar atrophy and gliosis of the olivopontocerebellar fibers, characterized by T2 hyperintensity within the pons. Genetic testing revealed a likely pathogenic germline variant in MFN2 (NM_014874: c.[838C>T];[=], p.(R280C)) in the GTPase domain (G) interface; pathogenic variants of MFN2 typically cause hereditary sensory and motor neuropathy VI or Charcot-Marie-Tooth disease 2A. The presence of progressive ataxia, "hot cross bun" sign, and dysautonomia has been associated with multiple system atrophy, cerebellar type (MSA-C). Discussion We describe progressive cerebellar ataxia in an individual with a deleterious variant in MFN2. Our findings suggest that pathogenic variants in MFN2 can result in a spectrum of phenotypes including cerebellar ataxia with cerebellar-pontine atrophy in the absence of significant neuropathy and in a manner closely resembling MSA-C.
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Affiliation(s)
- Adrienne Elbert
- From the Department of Medical Genetics (A.E., K.D., C.F.B., S.J.J.), University of British Columbia; Provincial Medical Genetics Program (A.E., S.H., C.B.), B.C. Women's Hospital and Health Centre; Canada's Michael Smith Genome Sciences Centre (K.D., Y.S., S.J.J.), BC Cancer; Fraser Health Movement Disorders Clinic (A.K.K.), Jim Pattison Outpatient Care and Surgery Centre, Surrey; and Department of Medicine (A.K.K.), Division of Neurology, University of British Columbia, Vancouver, Canada
| | - Katherine Dixon
- From the Department of Medical Genetics (A.E., K.D., C.F.B., S.J.J.), University of British Columbia; Provincial Medical Genetics Program (A.E., S.H., C.B.), B.C. Women's Hospital and Health Centre; Canada's Michael Smith Genome Sciences Centre (K.D., Y.S., S.J.J.), BC Cancer; Fraser Health Movement Disorders Clinic (A.K.K.), Jim Pattison Outpatient Care and Surgery Centre, Surrey; and Department of Medicine (A.K.K.), Division of Neurology, University of British Columbia, Vancouver, Canada
| | - Yaoqing Shen
- From the Department of Medical Genetics (A.E., K.D., C.F.B., S.J.J.), University of British Columbia; Provincial Medical Genetics Program (A.E., S.H., C.B.), B.C. Women's Hospital and Health Centre; Canada's Michael Smith Genome Sciences Centre (K.D., Y.S., S.J.J.), BC Cancer; Fraser Health Movement Disorders Clinic (A.K.K.), Jim Pattison Outpatient Care and Surgery Centre, Surrey; and Department of Medicine (A.K.K.), Division of Neurology, University of British Columbia, Vancouver, Canada
| | - Sara Hamilton
- From the Department of Medical Genetics (A.E., K.D., C.F.B., S.J.J.), University of British Columbia; Provincial Medical Genetics Program (A.E., S.H., C.B.), B.C. Women's Hospital and Health Centre; Canada's Michael Smith Genome Sciences Centre (K.D., Y.S., S.J.J.), BC Cancer; Fraser Health Movement Disorders Clinic (A.K.K.), Jim Pattison Outpatient Care and Surgery Centre, Surrey; and Department of Medicine (A.K.K.), Division of Neurology, University of British Columbia, Vancouver, Canada
| | - Cornelius F Boerkoel
- From the Department of Medical Genetics (A.E., K.D., C.F.B., S.J.J.), University of British Columbia; Provincial Medical Genetics Program (A.E., S.H., C.B.), B.C. Women's Hospital and Health Centre; Canada's Michael Smith Genome Sciences Centre (K.D., Y.S., S.J.J.), BC Cancer; Fraser Health Movement Disorders Clinic (A.K.K.), Jim Pattison Outpatient Care and Surgery Centre, Surrey; and Department of Medicine (A.K.K.), Division of Neurology, University of British Columbia, Vancouver, Canada
| | - Steven J Jones
- From the Department of Medical Genetics (A.E., K.D., C.F.B., S.J.J.), University of British Columbia; Provincial Medical Genetics Program (A.E., S.H., C.B.), B.C. Women's Hospital and Health Centre; Canada's Michael Smith Genome Sciences Centre (K.D., Y.S., S.J.J.), BC Cancer; Fraser Health Movement Disorders Clinic (A.K.K.), Jim Pattison Outpatient Care and Surgery Centre, Surrey; and Department of Medicine (A.K.K.), Division of Neurology, University of British Columbia, Vancouver, Canada
| | - Anish K Kanungo
- From the Department of Medical Genetics (A.E., K.D., C.F.B., S.J.J.), University of British Columbia; Provincial Medical Genetics Program (A.E., S.H., C.B.), B.C. Women's Hospital and Health Centre; Canada's Michael Smith Genome Sciences Centre (K.D., Y.S., S.J.J.), BC Cancer; Fraser Health Movement Disorders Clinic (A.K.K.), Jim Pattison Outpatient Care and Surgery Centre, Surrey; and Department of Medicine (A.K.K.), Division of Neurology, University of British Columbia, Vancouver, Canada
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Matsui S, Iwatani S, Morisada N, Takenouchi T, Yoshimoto S. Vocal cord paralysis in autosomal dominant spinal muscular atrophy due to BICD2. Congenit Anom (Kyoto) 2023; 63:52-53. [PMID: 36517450 DOI: 10.1111/cga.12500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 10/23/2022] [Accepted: 11/16/2022] [Indexed: 12/23/2022]
Affiliation(s)
- Sachiko Matsui
- Department of Neonatology, Hyogo Prefectural Kobe Children's Hospital, Kobe, Hyogo, Japan
| | - Sota Iwatani
- Department of Neonatology, Hyogo Prefectural Kobe Children's Hospital, Kobe, Hyogo, Japan
| | - Naoya Morisada
- Department of Clinical Genetics, Hyogo Prefectural Kobe Children's Hospital, Kobe, Hyogo, Japan
| | - Toshiki Takenouchi
- Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan
| | - Seiji Yoshimoto
- Department of Neonatology, Hyogo Prefectural Kobe Children's Hospital, Kobe, Hyogo, Japan
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