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Embersics C, Bannasch D, Batcher K, Boudreau EC, Church M, Miller A, Platt S, Koehler J, Olby N, Rossmeisl J, Rissi D, Grahn R, Donner J, Dickinson PJ. Association of the FGF4L2 retrogene with fibrocartilaginous embolic myelopathy in dogs. J Vet Intern Med 2024; 38:258-267. [PMID: 37916855 PMCID: PMC10800192 DOI: 10.1111/jvim.16925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 10/18/2023] [Indexed: 11/03/2023] Open
Abstract
BACKGROUND Fibrocartilaginous embolic myelopathy (FCE) is a well-documented condition in dogs although rarely reported in chondrodystrophic breeds. Genetic associations have not been defined. OBJECTIVES Define the association of the chondrodystrophy-associated FGF4L2 retrogene with histopathologically confirmed cases of FCE. ANIMALS Ninety-eight dogs with a histopathologic diagnosis of FCE. METHODS Retrospective multicenter study. Dogs were genotyped for the FGF4L2 and FGF4L1 retrogenes using DNA extracted from formalin-fixed, paraffin-embedded tissue. Associations between breed, FCE and retrogene status were investigated with reference to a hospital population and known breed and general population allele frequencies. RESULTS FGF4L2 genotype was defined in 89 FCE cases. Fibrocartilaginous embolic myelopathy was present in 22 dogs from FGF4L2-segregating breeds with allele frequencies of ≥5%; however, all dogs were wild type. Two Labrador retrievers with FCE carried FGF4L2 alleles. Frequency of the FGF4L2 allele was significantly (P < .001) and negatively associated with FCE relative to predicted hospital-population dogs. FCE was overrepresented in Boxer, Great Dane, Yorkshire Terrier, Bernese Mountain Dog, Miniature Schnauzer, Rottweiler, and Shetland Sheepdog breeds. CONCLUSIONS AND CLINICAL IMPORTANCE Study data based on genotypically and histopathologically defined cases support the historical observation that FCE is uncommon in chondrodystrophic dog breeds. FGF4 plays an important role in angiogenesis and vascular integrity; anatomical studies comparing chondrodystrophic and non-chondrodystrophic dogs might provide insight into the pathogenesis of FCE.
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Affiliation(s)
- Colleen Embersics
- Veterinary Medical Teaching Hospital, UC Davis School of Veterinary MedicineUniversity of California, DavisDavisCaliforniaUSA
| | - Danika Bannasch
- Department of Population Health and ReproductionUniversity of California, DavisDavisCaliforniaUSA
| | - Kevin Batcher
- Department of Population Health and ReproductionUniversity of California, DavisDavisCaliforniaUSA
| | - Elizabeth C. Boudreau
- Department of Small Animal Clinical SciencesTexas A&M School of Veterinary Medicine & Biomedical SciencesCollege StationTexasUSA
| | - Molly Church
- Department of PathobiologyUniversity of Pennsylvania, School of Veterinary MedicinePhiladelphiaPennsylvaniaUSA
| | - Andrew Miller
- Department of Biomedical SciencesCornell University College of Veterinary MedicineIthicaNew YorkUSA
| | | | - Jey Koehler
- Department of PathobiologyAuburn University College of Veterinary MedicineAuburnAlabamaUSA
| | - Natasha Olby
- Department of Clinical SciencesNorth Carolina State University College of Veterinary MedicineRaleighNorth CarolinaUSA
| | - John Rossmeisl
- Department of Small Animal Clinical SciencesVirginia‐Maryland College of Veterinary MedicineBlacksburgVirginiaUSA
| | - Daniel Rissi
- Department of PathologyUniversity of Georgia College of Veterinary MedicineAthensGeorgiaUSA
| | - Robert Grahn
- Veterinary Genetics LaboratoryUniversity of California, DavisDavisCaliforniaUSA
| | - Jonas Donner
- Wisdom Panel Research Team, Wisdom PanelHelsinkiFinland
| | - Peter J. Dickinson
- Department of Surgical and Radiological SciencesUniversity of California, DavisDavisCaliforniaUSA
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Batcher K, Varney S, Raudsepp T, Jevit M, Dickinson P, Jagannathan V, Leeb T, Bannasch D. Ancient segmentally duplicated LCORL retrocopies in equids. PLoS One 2023; 18:e0286861. [PMID: 37289743 PMCID: PMC10249811 DOI: 10.1371/journal.pone.0286861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 05/25/2023] [Indexed: 06/10/2023] Open
Abstract
LINE-1 is an active transposable element encoding proteins capable of inserting host gene retrocopies, resulting in retro-copy number variants (retroCNVs) between individuals. Here, we performed retroCNV discovery using 86 equids and identified 437 retrocopy insertions. Only 5 retroCNVs were shared between horses and other equids, indicating that the majority of retroCNVs inserted after the species diverged. A large number (17-35 copies) of segmentally duplicated Ligand Dependent Nuclear Receptor Corepressor Like (LCORL) retrocopies were present in all equids but absent from other extant perissodactyls. The majority of LCORL transcripts in horses and donkeys originate from the retrocopies. The initial LCORL retrotransposition occurred 18 million years ago (17-19 95% CI), which is coincident with the increase in body size, reduction in digit number, and changes in dentition that characterized equid evolution. Evolutionary conservation of the LCORL retrocopy segmental amplification in the Equidae family, high expression levels and the ancient timeline for LCORL retrotransposition support a functional role for this structural variant.
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Affiliation(s)
- Kevin Batcher
- Department of Population Health and Reproduction, University of California Davis, Davis, CA, United States of America
| | - Scarlett Varney
- Department of Population Health and Reproduction, University of California Davis, Davis, CA, United States of America
| | - Terje Raudsepp
- Veterinary Integrative Biosciences, School of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, United States of America
| | - Matthew Jevit
- Veterinary Integrative Biosciences, School of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, United States of America
| | - Peter Dickinson
- Department of Surgical and Radiological Sciences, University of California Davis, Davis, CA, United States of America
| | - Vidhya Jagannathan
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Tosso Leeb
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Danika Bannasch
- Department of Population Health and Reproduction, University of California Davis, Davis, CA, United States of America
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Bianchi CA, Marcellin-Little DJ, Dickinson PJ, Garcia TC, Li CF, Batcher K, Bannasch DL. FGF4L2 retrogene copy number is associated with intervertebral disc calcification and vertebral geometry in Nova Scotia Duck Tolling Retrievers. Am J Vet Res 2023; 84:ajvr.22.09.0167. [PMID: 36662606 DOI: 10.2460/ajvr.22.09.0167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 12/23/2022] [Indexed: 01/21/2023]
Abstract
OBJECTIVES To evaluate the effects of the chondrodystrophy-associated FGF4L2 retrogene on intervertebral disc (IVD) calcification and vertebral geometry. ANIMALS 22 Nova Scotia Duck Tolling Retrievers (NSDTR) with no FGF4L2 retrogene (n = 7, wild-type dogs), 1 retrogene copy (8, heterozygous dogs), or 2 retrogene copies (7, homozygous dogs). PROCEDURES Computed tomography (CT) scans of the vertebral column were analyzed using computer-aided design (CAD) software. IVD calcification, vertebral column length, and vertebral geometry of the third cervical (C3), 13th thoracic (T13), and first lumbar (L1) vertebrae were compared. RESULTS IVD calcification was not found in wild-type dogs. IVD calcification was more frequent in homozygous dogs than heterozygous (P = .008) or wild-type dogs (P < .001) and in heterozygous dogs compared to wild-type dogs (P < .001). Four IVDs were subclinically herniated in 3 dogs (2 homozygous, 1 heterozygous). Calcified IVD had a greater volume and surface area in heterozygous dogs than homozygous dogs. C3 vertebral canal height-to-width ratio was greater in homozygous dogs than heterozygous dogs (P = .044) and wild-type dogs (P = .010). CLINICAL RELEVANCE IVD calcification and vertebral geometry can be analyzed using CAD software. The presence of 1 or 2 FGF4L2 copies in the absence of the FGF4L1 retrogene has an additive effect on the number of calcified IVD and a minor effect on vertebral geometry in NSDTR dogs. Data support the use of FGF4L2 phenotyping to reduce clinical disease in segregating breeds and to monitor the introduction of wild-type alleles into fixed breed populations.
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Affiliation(s)
- Catarina A Bianchi
- Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Denis J Marcellin-Little
- Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Peter J Dickinson
- Department of Veterinary Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Tanya C Garcia
- Veterinary Orthopedic Research Laboratory, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Chai-Fei Li
- Department of Veterinary Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Kevin Batcher
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Danika L Bannasch
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California-Davis, Davis, CA
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Batcher K, Varney S, Affolter VK, Friedenberg SG, Bannasch D. An SNN retrocopy insertion upstream of GPR22 is associated with dark red coat color in Poodles. G3 Genes|Genomes|Genetics 2022; 12:6680184. [PMID: 36047852 PMCID: PMC9635648 DOI: 10.1093/g3journal/jkac227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 08/27/2022] [Indexed: 11/21/2022]
Abstract
Pigment production and distribution is controlled through multiple genes, resulting in a wide range of coat color phenotypes in dogs. Dogs that produce only the pheomelanin pigment vary in intensity from white to deep red. The Poodle breed has a wide range of officially recognized coat colors, including the pheomelanin-based white, cream, apricot, and red coat colors, which are not fully explained by the previously identified genetic variants involved in pigment intensity. Here, a genome-wide association study for pheomelanin intensity was performed in Poodles which identified an association on canine chromosome 18. Whole-genome sequencing data revealed an SNN retrocopy insertion (SNNL1) in apricot and red Poodles within the associated region on chromosome 18. While equal numbers of melanocytes were observed in all Poodle skin hair bulbs, higher melanin content was observed in the darker Poodles. Several genes involved in melanogenesis were also identified as highly overexpressed in red Poodle skin. The most differentially expressed gene however was GPR22, which was highly expressed in red Poodle skin while unexpressed in white Poodle skin (log2 fold change in expression 6.1, P < 0.001). GPR22 is an orphan G-protein-coupled receptor normally expressed exclusively in the brain and heart. The SNNL1 retrocopy inserted 2.8 kb upstream of GPR22 and is likely disrupting regulation of the gene, resulting in atypical expression in the skin. Thus, we identify the SNNL1 insertion as a candidate variant for the CFA18 pheomelanin intensity locus in red Poodles.
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Affiliation(s)
- Kevin Batcher
- Department of Population Health and Reproduction, University of California , Davis, Davis, CA 95616, USA
| | - Scarlett Varney
- Department of Population Health and Reproduction, University of California , Davis, Davis, CA 95616, USA
| | - Verena K Affolter
- Department of Pathology, Microbiology, & Immunology, University of California, Davis , Davis, CA 95616, USA
| | - Steven G Friedenberg
- Department of Veterinary Clinical Sciences, University of Minnesota , St Paul, MN 55455, USA
| | - Danika Bannasch
- Department of Population Health and Reproduction, University of California , Davis, Davis, CA 95616, USA
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Batcher K, Varney S, York D, Blacksmith M, Kidd JM, Rebhun R, Dickinson P, Bannasch D. Recent, full-length gene retrocopies are common in canids. Genome Res 2022; 32:gr.276828.122. [PMID: 35961775 PMCID: PMC9435743 DOI: 10.1101/gr.276828.122] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 07/19/2022] [Indexed: 02/03/2023]
Abstract
Gene retrocopies arise from the reverse transcription and insertion into the genome of processed mRNA transcripts. Although many retrocopies have acquired mutations that render them functionally inactive, most mammals retain active LINE-1 sequences capable of producing new retrocopies. New retrocopies, referred to as retro copy number variants (retroCNVs), may not be identified by standard variant calling techniques in high-throughput sequencing data. Although multiple functional FGF4 retroCNVs have been associated with skeletal dysplasias in dogs, the full landscape of canid retroCNVs has not been characterized. Here, retroCNV discovery was performed on a whole-genome sequencing data set of 293 canids from 76 breeds. We identified retroCNV parent genes via the presence of mRNA-specific 30-mers, and then identified retroCNV insertion sites through discordant read analysis. In total, we resolved insertion sites for 1911 retroCNVs from 1179 parent genes, 1236 of which appeared identical to their parent genes. Dogs had on average 54.1 total retroCNVs and 1.4 private retroCNVs. We found evidence of expression in testes for 12% (14/113) of the retroCNVs identified in six Golden Retrievers, including four chimeric transcripts, and 97 retroCNVs also had significantly elevated F ST across dog breeds, possibly indicating selection. We applied our approach to a subset of human genomes and detected an average of 4.2 retroCNVs per sample, highlighting a 13-fold relative increase of retroCNV frequency in dogs. Particularly in canids, retroCNVs are a largely unexplored source of genetic variation that can contribute to genome plasticity and that should be considered when investigating traits and diseases.
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Affiliation(s)
- Kevin Batcher
- Department of Population Health and Reproduction, University of California, Davis, Davis, California 95616, USA
| | - Scarlett Varney
- Department of Population Health and Reproduction, University of California, Davis, Davis, California 95616, USA
| | - Daniel York
- Department of Surgical and Radiological Sciences, University of California, Davis, Davis, California 95616, USA
| | - Matthew Blacksmith
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, Michigan 48109, USA
| | - Jeffrey M Kidd
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, Michigan 48109, USA
- Department of Computational Medicine and Bioinformatics, University of Michigan Medical School, Ann Arbor, Michigan 48109, USA
| | - Robert Rebhun
- Department of Surgical and Radiological Sciences, University of California, Davis, Davis, California 95616, USA
| | - Peter Dickinson
- Department of Surgical and Radiological Sciences, University of California, Davis, Davis, California 95616, USA
| | - Danika Bannasch
- Department of Population Health and Reproduction, University of California, Davis, Davis, California 95616, USA
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Batcher K, Dickinson P, Maciejczyk K, Brzeski K, Rasouliha SH, Letko A, Drögemüller C, Leeb T, Bannasch D. Multiple FGF4 Retrocopies Recently Derived within Canids. Genes (Basel) 2020; 11:genes11080839. [PMID: 32717834 PMCID: PMC7465015 DOI: 10.3390/genes11080839] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 07/21/2020] [Accepted: 07/21/2020] [Indexed: 12/17/2022] Open
Abstract
Two transcribed retrocopies of the fibroblast growth factor 4 (FGF4) gene have previously been described in the domestic dog. An FGF4 retrocopy on chr18 is associated with disproportionate dwarfism, while an FGF4 retrocopy on chr12 is associated with both disproportionate dwarfism and intervertebral disc disease (IVDD). In this study, whole-genome sequencing data were queried to identify other FGF4 retrocopies that could be contributing to phenotypic diversity in canids. Additionally, dogs with surgically confirmed IVDD were assayed for novel FGF4 retrocopies. Five additional and distinct FGF4 retrocopies were identified in canids including a copy unique to red wolves (Canis rufus). The FGF4 retrocopies identified in domestic dogs were identical to domestic dog FGF4 haplotypes, which are distinct from modern wolf FGF4 haplotypes, indicating that these retrotransposition events likely occurred after domestication. The identification of multiple, full length FGF4 retrocopies with open reading frames in canids indicates that gene retrotransposition events occur much more frequently than previously thought and provide a mechanism for continued genetic and phenotypic diversity in canids.
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Affiliation(s)
- Kevin Batcher
- Department of Population Health and Reproduction, University of California-Davis, Davis, CA 95616, USA; (K.B.); (K.M.)
| | - Peter Dickinson
- Department of Surgical and Radiological Sciences, University of California-Davis, Davis, CA 95616, USA;
| | - Kimberly Maciejczyk
- Department of Population Health and Reproduction, University of California-Davis, Davis, CA 95616, USA; (K.B.); (K.M.)
| | - Kristin Brzeski
- College of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI 49931, USA;
| | - Sheida Hadji Rasouliha
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (S.H.R.); (A.L.); (C.D.); (T.L.)
| | - Anna Letko
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (S.H.R.); (A.L.); (C.D.); (T.L.)
| | - Cord Drögemüller
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (S.H.R.); (A.L.); (C.D.); (T.L.)
| | - Tosso Leeb
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (S.H.R.); (A.L.); (C.D.); (T.L.)
| | - Danika Bannasch
- Department of Population Health and Reproduction, University of California-Davis, Davis, CA 95616, USA; (K.B.); (K.M.)
- Correspondence:
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Leeb T, Leuthard F, Jagannathan V, Kiener S, Letko A, Roosje P, Welle MM, Gailbreath KL, Cannon A, Linek M, Banovic F, Olivry T, White SD, Batcher K, Bannasch D, Minor KM, Mickelson JR, Hytönen MK, Lohi H, Mauldin EA, Casal ML. A Missense Variant Affecting the C-Terminal Tail of UNC93B1 in Dogs with Exfoliative Cutaneous Lupus Erythematosus (ECLE). Genes (Basel) 2020; 11:E159. [PMID: 32028618 PMCID: PMC7074252 DOI: 10.3390/genes11020159] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 01/27/2020] [Accepted: 01/31/2020] [Indexed: 01/20/2023] Open
Abstract
Cutaneous lupus erythematosus (CLE) in humans encompasses multiple subtypes that exhibit a wide array of skin lesions and, in some cases, are associated with the development of systemic lupus erythematosus (SLE). We investigated dogs with exfoliative cutaneous lupus erythematosus (ECLE), a dog-specific form of chronic CLE that is inherited as a monogenic autosomal recessive trait. A genome-wide association study (GWAS) with 14 cases and 29 controls confirmed a previously published result that the causative variant maps to chromosome 18. Autozygosity mapping refined the ECLE locus to a 493 kb critical interval. Filtering of whole genome sequence data from two cases against 654 controls revealed a single private protein-changing variant in this critical interval, UNC93B1:c.1438C>A or p.Pro480Thr. The homozygous mutant genotype was exclusively observed in 23 ECLE affected German Shorthaired Pointers and an ECLE affected Vizsla, but absent from 845 controls. UNC93B1 is a transmembrane protein located in the endoplasmic reticulum and endolysosomes, which is required for correct trafficking of several Toll-like receptors (TLRs). The p.Pro480Thr variant is predicted to affect the C-terminal tail of the UNC93B1 that has recently been shown to restrict TLR7 mediated autoimmunity via an interaction with syndecan binding protein (SDCBP). The functional knowledge on UNC93B1 strongly suggests that p.Pro480Thr is causing ECLE in dogs. These dogs therefore represent an interesting spontaneous model for human lupus erythematosus. Our results warrant further investigations of whether genetic variants affecting the C-terminus of UNC93B1 might be involved in specific subsets of CLE or SLE cases in humans and other species.
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Affiliation(s)
- Tosso Leeb
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland; (F.L.); (V.J.); (S.K.); (A.L.)
- Dermfocus, University of Bern, 3001 Bern, Switzerland; (P.R.); (M.M.W.)
| | - Fabienne Leuthard
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland; (F.L.); (V.J.); (S.K.); (A.L.)
- Dermfocus, University of Bern, 3001 Bern, Switzerland; (P.R.); (M.M.W.)
| | - Vidhya Jagannathan
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland; (F.L.); (V.J.); (S.K.); (A.L.)
- Dermfocus, University of Bern, 3001 Bern, Switzerland; (P.R.); (M.M.W.)
| | - Sarah Kiener
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland; (F.L.); (V.J.); (S.K.); (A.L.)
- Dermfocus, University of Bern, 3001 Bern, Switzerland; (P.R.); (M.M.W.)
| | - Anna Letko
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland; (F.L.); (V.J.); (S.K.); (A.L.)
- Dermfocus, University of Bern, 3001 Bern, Switzerland; (P.R.); (M.M.W.)
| | - Petra Roosje
- Dermfocus, University of Bern, 3001 Bern, Switzerland; (P.R.); (M.M.W.)
- Division of Clinical Dermatology, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland
| | - Monika M. Welle
- Dermfocus, University of Bern, 3001 Bern, Switzerland; (P.R.); (M.M.W.)
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland
| | | | | | - Monika Linek
- AniCura Tierärztliche Spezialisten, 22043 Hamburg, Germany;
| | - Frane Banovic
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA;
| | - Thierry Olivry
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA;
| | - Stephen D. White
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California Davis, Davis, CA 95616, USA;
| | - Kevin Batcher
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, CA 95616, USA; (K.B.); (D.B.)
| | - Danika Bannasch
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, CA 95616, USA; (K.B.); (D.B.)
| | - Katie M. Minor
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Saint Paul, MN 55108, USA; (K.M.M.); (J.R.M.)
| | - James R. Mickelson
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Saint Paul, MN 55108, USA; (K.M.M.); (J.R.M.)
| | - Marjo K. Hytönen
- Department of Veterinary Biosciences, University of Helsinki, 00014 Helsinki, Finland; (M.K.H.); (H.L.)
- Department of Medical and Clinical Genetics, University of Helsinki, 00014 Helsinki, Finland
- Folkhälsan Research Center, 00290 Helsinki, Finland
| | - Hannes Lohi
- Department of Veterinary Biosciences, University of Helsinki, 00014 Helsinki, Finland; (M.K.H.); (H.L.)
- Department of Medical and Clinical Genetics, University of Helsinki, 00014 Helsinki, Finland
- Folkhälsan Research Center, 00290 Helsinki, Finland
| | - Elizabeth A. Mauldin
- School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (E.A.M.); (M.L.C.)
| | - Margret L. Casal
- School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (E.A.M.); (M.L.C.)
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Murphy BG, Dickinson P, Marcellin-Little DJ, Batcher K, Raverty S, Bannasch D. Pathologic Features of the Intervertebral Disc in Young Nova Scotia Duck Tolling Retrievers Confirms Chondrodystrophy Degenerative Phenotype Associated With Genotype. Vet Pathol 2019; 56:895-902. [PMID: 31526126 DOI: 10.1177/0300985819868731] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Chondrodystrophy results in predictable and progressive biochemical and structural changes to the intervertebral disc, resulting in early onset degeneration and dystrophic mineralization of the disc. Accelerated degeneration and mineralization of the intervertebral disc are common in multiple dog breeds and can result in compromised function, herniation, pain, and a variety of neurological sequelae. A mutation responsible for chondrodystrophy in dogs has been identified as an aberrant fibroblast growth factor 4 (FGF4) retrogene insertion on chromosome 12 (CFA12) and is associated with short stature of the Nova Scotia Duck Tolling Retriever. Segregation of the CFA12 FGF4 retrogene in this dog breed provides an opportunity to examine the effect of retrogene presence on radiographic and histologic appearance of chondrodystrophic disc degeneration within a single breed. Here we found that in the intervertebral discs isolated from 2 dogs with the CFA12 FGF4 genotype, the nucleus pulposus was largely replaced by cartilaginous tissue, and physaliferous notochordal cells were rarely if ever identified. These findings are in contrast to the normal histologic findings in 2 breed-matched dogs lacking the mutation. The findings are consistent with premature chondroid degeneration of the intervertebral disc and suggest that the presence of the CFA12 FGF4 retrogene is sufficient to cause the chondrodystrophic phenotype.
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Affiliation(s)
- Brian G Murphy
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - Peter Dickinson
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - Denis J Marcellin-Little
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - Kevin Batcher
- Department of Population Health and Reproduction, University of California, Davis, CA, USA
| | | | - Danika Bannasch
- Department of Population Health and Reproduction, University of California, Davis, CA, USA
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