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Chimenes ND, Caramalac SM, Caramalac SM, Fernandes TD, Basso RM, Cerri FM, Oliveira-Filho JP, Borges AS, Palumbo MIP. A complex CLCN1 variant associated with hereditary myotonia in a mixed-breed dog. J Vet Diagn Invest 2023; 35:413-416. [PMID: 37212506 PMCID: PMC10331391 DOI: 10.1177/10406387231176736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2023] Open
Abstract
Hereditary myotonia (HM) is characterized by delayed muscle relaxation after contraction as a result of a mutation in the CLCN1 gene. We describe here a complex CLCN1 variant in a mixed-breed dog with clinical and electromyographic signs of HM. Blood samples from the myotonic dog, as well as from his male littermate and parents, were analyzed via amplification of the 23 exons encoding CLCN1. After sequencing the CLCN1 gene, a complex variant was found in exon 6 c.[705T>G; 708del; 712_732del], resulting in a premature stop codon in exon 7 and a protein that was 717 amino acids shorter than the normal CLC protein. The myotonic dog was identified as homozygous recessive for the complex CLCN1 variant; its parents were heterozygous, and its male littermate was homozygous wild-type. Knowledge of the CLCN1 mutations responsible for the development of hereditary myotonia allows greater clarification of this condition.
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Affiliation(s)
- Natielly D. Chimenes
- Faculty of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Mato Grosso do Sul, Brazil
| | - Silvana M. Caramalac
- Faculty of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Mato Grosso do Sul, Brazil
| | - Simone M. Caramalac
- Faculty of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Mato Grosso do Sul, Brazil
| | - Thiago D. Fernandes
- Faculty of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Mato Grosso do Sul, Brazil
| | - Roberta M. Basso
- Department of Veterinary Clinical Science, School of Veterinary Medicine and Animal Science, São Paulo State University (Unesp), Botucatu, São Paulo, Brazil
| | - Fabrício M. Cerri
- Department of Veterinary Clinical Science, School of Veterinary Medicine and Animal Science, São Paulo State University (Unesp), Botucatu, São Paulo, Brazil
| | - José P. Oliveira-Filho
- Department of Veterinary Clinical Science, School of Veterinary Medicine and Animal Science, São Paulo State University (Unesp), Botucatu, São Paulo, Brazil
| | - Alexandre S. Borges
- Department of Veterinary Clinical Science, School of Veterinary Medicine and Animal Science, São Paulo State University (Unesp), Botucatu, São Paulo, Brazil
| | - Mariana I. P. Palumbo
- Faculty of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Mato Grosso do Sul, Brazil
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Dog-human translational genomics: state of the art and genomic resources. J Appl Genet 2022; 63:703-716. [PMID: 36074326 DOI: 10.1007/s13353-022-00721-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Revised: 08/26/2022] [Accepted: 08/30/2022] [Indexed: 10/14/2022]
Abstract
Innovative models for medical research are strongly required nowadays. Convincing evidence supports dog as the most suitable spontaneous model for several human genetic diseases. Decades of studies on dog genome allowed the identification of hundreds of mutations causing genetic disorders, many of which are proposed as counterparts responsible for human diseases. Traditionally, the murine model is the most extensively used in human translational research. However, this species shows large physiological differences from humans, and it is kept under a controlled artificial environment. Conversely, canine genetic disorders often show pathophysiological and clinical features highly resembling the human counterpart. In addition, dogs share the same environment with humans; therefore, they are naturally exposed to many risk factors. Thus, different branches of translational medicine aim to study spontaneously occurring diseases in dogs to provide a more reliable model for human disorders. This review offers a comprehensive overview of the knowledge and resources available today for all the researchers involved in the field of dog-human translational medicine. Some of the main successful examples from dog-human translational genomics are reported, such as the canine association studies which helped to identify the causal mutation in the human counterpart. We also illustrated the ongoing projects aiming to create public canine big datasets. Finally, specific online databases are discussed along with several information resources that can speed up clinical translational research.
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Clark JA, Hooser SB, Dreger DL, Burcham GN, Ekenstedt KJ. Investigation of a common canine factor VII deficiency variant in dogs with unexplained bleeding on autopsy. J Vet Diagn Invest 2022; 34:806-812. [PMID: 35949113 PMCID: PMC9446296 DOI: 10.1177/10406387221118581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The factor VII (FVII) protein is an integral component of the extrinsic coagulation pathway. Deleterious variants in the gene encoding this protein can result in factor VII deficiency (FVIID), a bleeding disorder characterized by abnormal (slowed) clotting with a wide range of severity, from asymptomatic to life-threatening. In canids, a single FVIID-associated variant, first described in Beagles, has been observed in 24 breeds and mixed-breed dogs. Because this variant is present in breeds of diverse backgrounds, we hypothesized that it could be a contributing factor to unexplained bleeding observed in some canine autopsy cases. DNA was extracted from paraffin-embedded tissue samples from 67 anticoagulant-negative autopsy cases with unexplained etiology for gross lesions of hemorrhage. Each dog was genotyped for the c.407G>A (F71) variant. Experimental controls included 3 known heterozygotes and 2 known homozygotes for the F71 variant, 2 normal dogs with known homozygous wild-type genotypes (F7WF7W), and 5 dogs with bleeding at autopsy that tested positive for anticoagulant rodenticide and were genotyped as F7WF7W. All 67 cases tested homozygous for the wild-type allele, indicating that the common FVIID variant was not responsible for the observed unexplained bleeding. Our work demonstrates the usefulness of retrospective studies utilizing veterinary diagnostic laboratory databases and tissue archives for genetic studies. In the case of FVIID, our results suggest that a singular molecular test for the F71 variant is not a high-yield addition to postmortem screening in these scenarios.
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Affiliation(s)
- Jessica A. Clark
- Department of Basic Medical Sciences, College
of Veterinary Medicine, Purdue University, West Lafayette, IN, USA
| | - Stephen B. Hooser
- Animal Disease Diagnostic Laboratory,
Department of Comparative Pathobiology, College of Veterinary Medicine,
Purdue University, West Lafayette, IN, USA
| | - Dayna L. Dreger
- Department of Basic Medical Sciences, College
of Veterinary Medicine, Purdue University, West Lafayette, IN, USA. Current
address: National Human Genome Research Institute, NIH, Bethesda, MD,
USA
| | - Grant N. Burcham
- Animal Disease Diagnostic Laboratory,
Department of Comparative Pathobiology, College of Veterinary Medicine,
Purdue University, West Lafayette, IN, USA
| | - Kari J. Ekenstedt
- Department of Basic Medical Sciences, College
of Veterinary Medicine, Purdue University, West Lafayette, IN, USA
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Amengual-Batle P, Rusbridge C, José-López R, Golini L, Shelton GD, Mellersh CS, Gutierrez-Quintana R. Two mixed breed dogs with sensory neuropathy are homozygous for an inversion disrupting FAM134B previously identified in Border Collies. J Vet Intern Med 2018; 32:2082-2087. [PMID: 30307654 PMCID: PMC6272042 DOI: 10.1111/jvim.15312] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 05/19/2018] [Accepted: 07/31/2018] [Indexed: 01/21/2023] Open
Abstract
Two unrelated 8‐month‐old male mixed breed dogs were presented for evaluation of progressive ataxia, knuckling, and lack of pain perception in the distal limbs. Because of the similarity in age of onset, progression, and clinical findings with previously described sensory neuropathy in Border Collies, the affected dogs were screened for an FAM134B mutation and were determined to be homozygous for the mutation. Despite few phenotypic similarities with other breeds, genetic testing for specific diseases should be considered in mixed breed dogs with compatible clinical signs, especially if ancestry is unknown.
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Affiliation(s)
- Pablo Amengual-Batle
- Small Animal Hospital, School of Veterinary Medicine, University of Glasgow, Glasgow, United Kingdom
| | - Clare Rusbridge
- Fitzpatrick Referrals, Eashing, Surrey, United Kingdom.,Faculty of Health & Medical Sciences, University of Surrey, School of Veterinary Medicine, Vet School Main Building, Daphne Jackson Road, Guildford, GU2 7AL, United Kingdom
| | - Roberto José-López
- Small Animal Hospital, School of Veterinary Medicine, University of Glasgow, Glasgow, United Kingdom
| | - Lorenzo Golini
- Northwest Veterinary Specialists, Cheshire, United Kingdom
| | - G Diane Shelton
- Department of Pathology, School of Medicine, University of California, San Diego, San Diego, California
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