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Soto E, LaFrentz BR, Yun S, Megarani D, Henderson E, Piewbang C, Johnston AE, Techangamsuwan S, Ng TFF, Warg J, Surachetpong W, Subramaniam K. Diagnosis, isolation and description of a novel amnoonvirus recovered from diseased fancy guppies, Poecilia reticulata. JOURNAL OF FISH DISEASES 2024; 47:e13937. [PMID: 38440909 DOI: 10.1111/jfd.13937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 02/13/2024] [Accepted: 02/15/2024] [Indexed: 03/06/2024]
Abstract
The guppy, Poecilia reticulata, is one of the most common cultured ornamental fish species, and a popular pet fish highly desired by hobbyists worldwide due to its availability of many brilliantly coloured fish of many varieties. The susceptibility of guppies to diseases presents a remarkable concern for both breeders and hobbyists. In this study, we report the emergence of disease in fancy guppies caused by a previously uncharacterized virus in the USA. This virus was isolated from moribund guppies in two separate outbreaks in California and Alabama, from December 2021 to June 2023. The infected guppies presented with acute morbidity and mortality shortly after shipping, displaying nonspecific clinical signs and gross changes including lethargy, anorexia, swimming at the water surface, gill pallor, mild to moderate coelomic distension and occasional skin lesions including protruding scales, skin ulcers and hyperaemia. Histological changes in affected fish were mild and nonspecific; however, liver and testes from moribund fish were positive for Tilapia lake virus (TiLV), the single described member in the family Amnoonviridae, using immunohistochemistry and in situ hybridization, although the latter was weak. A virus was successfully recovered following tissue inoculation on epithelioma papulosum cyprini and snakehead fish cell lines. Whole genome sequencing and phylogenetic analyses revealed nucleotide and amino acid homologies from 78.3%-91.2%, and 78.2%-97.7%, respectively, when comparing the guppy virus genomes to TiLV isolates. Based on the criteria outlined herein, we propose the classification of this new virus, fancy tailed guppy virus (FTGV), as a member of the family Amnoonviridae, with the name Tilapinevirus poikilos (from the Greek 'poikilos', meaning of many colours; various sorts, akin to 'poecilia').
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Affiliation(s)
- Esteban Soto
- Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine University of California, Davis, California, USA
| | | | - Susan Yun
- Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine University of California, Davis, California, USA
| | - Dorothea Megarani
- Department of Infectious Diseases and Immunology, College of Veterinary Medicine, University of Florida, Gainesville, Florida, USA
| | - Eileen Henderson
- California Animal Health and Food Safety Lab, School of Veterinary Medicine, University of California, Davis, California, USA
| | - Chutchai Piewbang
- Animal Virome and Diagnostic Development Research Unit, Department of Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand
| | - Amber E Johnston
- Aquatic Animal Health Research Unit, USDA-ARS, Auburn, Alabama, USA
| | - Somporn Techangamsuwan
- Animal Virome and Diagnostic Development Research Unit, Department of Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand
| | - Terry Fei Fan Ng
- Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - Janet Warg
- Diagnostic Virology Laboratory, National Veterinary Services Laboratories, United States Department of Agriculture, Ames, Iowa, USA
| | - Win Surachetpong
- Department of Veterinary Microbiology and Immunology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok, Thailand
| | - Kuttichantran Subramaniam
- Department of Infectious Diseases and Immunology, College of Veterinary Medicine, University of Florida, Gainesville, Florida, USA
- Emerging Pathogens Institute, University of Florida, Gainesville, Florida, USA
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Ramli, Aramaki T, Watanabe M, Kondo S. Piezo1 mutant zebrafish as a model of idiopathic scoliosis. Front Genet 2024; 14:1321379. [PMID: 38259612 PMCID: PMC10801085 DOI: 10.3389/fgene.2023.1321379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Accepted: 12/20/2023] [Indexed: 01/24/2024] Open
Abstract
Scoliosis is a condition where the spine curves sideways, unique to humans due to their upright posture. However, the cause of this disease is not well understood because it is challenging to find a model for experimentation. This study aimed to create a model for human idiopathic scoliosis by manipulating the function of mechanosensitive channels called Piezo channels in zebrafish. Zebrafish were chosen because they experience similar biomechanical forces to humans, particularly in relation to the role of mechanical force in scoliosis progression. Here we describe piezo1 and piezo2a are involved in bone formation, with a double knockout resulting in congenital systemic malformations. However, an in-frame mutation of piezo1 led to fully penetrant juvenile-onset scoliosis, bone asymmetry, reduced tissue mineral density, and abnormal intervertebral discs-resembling non-congenital scoliosis symptoms in humans. These findings suggest that functional Piezo channels responding to mechanical forces are crucial for bone formation and maintaining spine integrity, providing insights into skeletal disorders.
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Affiliation(s)
- Ramli
- Laboratory of Pattern Formation, Graduate School of Frontier Biosciences, Osaka University, Suita, Japan
| | - Toshihiro Aramaki
- Laboratory of Pattern Formation, Graduate School of Frontier Biosciences, Osaka University, Suita, Japan
- Japan Science and Technology Agency, PRESTO, Tokyo, Japan
| | - Masakatsu Watanabe
- Laboratory of Pattern Formation, Graduate School of Frontier Biosciences, Osaka University, Suita, Japan
| | - Shigeru Kondo
- Laboratory of Pattern Formation, Graduate School of Frontier Biosciences, Osaka University, Suita, Japan
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3
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Ru L, Zheng H, Lian W, Zhao S, Fan Q. Knowledge mapping of idiopathic scoliosis genes and research hotspots (2002-2022): a bibliometric analysis. Front Pediatr 2023; 11:1177983. [PMID: 38111628 PMCID: PMC10725947 DOI: 10.3389/fped.2023.1177983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 11/06/2023] [Indexed: 12/20/2023] Open
Abstract
Background The etiology of idiopathic scoliosis (IS) remains unclear. Gene-based studies on genetic etiology and molecular mechanisms have improved our understanding of IS and guided treatment and diagnosis. Therefore, it is imperative to explicate and demarcate the preponderant areas of inquiry, key scholars, and their aggregate scholarly output, in addition to the collaborative associations amongst publications or researchers. Methods Documents were retrieved from the Web of Science Core Collection (WoSCC) with the following criteria: TS = ("idiopathic scoliosis" AND gene) refined by search operators (genomic OR "hereditary substance" OR "germ plasm" OR Cistrons OR genetics OR genetic OR genes OR Polygenic OR genotype OR genome OR allele OR polygenes OR Polygene) AND DOCUMENT TYPES (ARTICLE OR REVIEW), and the timespan of 2002-01-01 to 2022-11-26. The online bibliometric analysis platform (bibliometric), bibliographic item co-occurrence matrix builder (BICOMB), CiteSpace 6.1. R6 and VOS viewer were used to evaluate articles for publications, nations, institutions, journals, references, knowledge bases, keywords, and research hotspots. Results A total of 479 documents were retrieved from WoSCC. Fourty-four countries published relevant articles. The country with the most significant number of articles was China, and the institution with the most significant number of articles was Nanjing University. Citation analysis formed eight meaningful clusters and 16 high-frequency keywords. (2) The citation knowledge map included single nucleotide polymorphisms, whole exome sequencing, axonal dynamin, drug development, mesenchymal stem cells, dietary intake, curve progression, zebrafish development model, extracellular matrix, and rare variants were the current research hotspots and frontiers. Conclusions Recent research has focused on IS-related genes, whereas the extracellular matrix and unusual variants are research frontiers and hotspots. Functional analysis of susceptibility genes will prove to be valuable for identifying this disease.
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Affiliation(s)
- Like Ru
- School of Pediatrics, Henan University of Chinese Medicine, Zhengzhou, China
| | - Hong Zheng
- The First Affiliated Hospital of Henan University of Chinese Medicine, Zhengzhou, China
- School of Pediatrics, Henan University of Chinese Medicine, Zhengzhou, China
| | - Wenjun Lian
- The First Affiliated Hospital of Henan University of Chinese Medicine, Zhengzhou, China
| | - Shuying Zhao
- The First Affiliated Hospital of Henan University of Chinese Medicine, Zhengzhou, China
| | - Qimeng Fan
- The First Affiliated Hospital of Henan University of Chinese Medicine, Zhengzhou, China
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Xie H, Li M, Kang Y, Zhang J, Zhao C. Zebrafish: an important model for understanding scoliosis. Cell Mol Life Sci 2022; 79:506. [PMID: 36059018 PMCID: PMC9441191 DOI: 10.1007/s00018-022-04534-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 08/05/2022] [Accepted: 08/19/2022] [Indexed: 02/06/2023]
Abstract
Scoliosis is a common spinal deformity that considerably affects the physical and psychological health of patients. Studies have shown that genetic factors play an important role in scoliosis. However, its etiopathogenesis remain unclear, partially because of the genetic heterogeneity of scoliosis and the lack of appropriate model systems. Recently, the development of efficient gene editing methods and high-throughput sequencing technology has made it possible to explore the underlying pathological mechanisms of scoliosis. Owing to their susceptibility for developing scoliosis and high genetic homology with human, zebrafish are increasingly being used as a model for scoliosis in developmental biology, genetics, and clinical medicine. Here, we summarize the recent advances in scoliosis research on zebrafish and discuss the prospects of using zebrafish as a scoliosis model.
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Affiliation(s)
- Haibo Xie
- Affiliated Hospital of Guangdong Medical University and Key Laboratory of Zebrafish Model for Development and Disease of Guangdong Medical University, Zhanjiang, 524001, China.,Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China.,Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266003, China.,Sars-Fang Centre, Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China
| | - Mingzhu Li
- Affiliated Hospital of Guangdong Medical University and Key Laboratory of Zebrafish Model for Development and Disease of Guangdong Medical University, Zhanjiang, 524001, China
| | - Yunsi Kang
- Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China.,Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266003, China.,Sars-Fang Centre, Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China
| | - Jingjing Zhang
- Affiliated Hospital of Guangdong Medical University and Key Laboratory of Zebrafish Model for Development and Disease of Guangdong Medical University, Zhanjiang, 524001, China. .,The Marine Biomedical Research Institute of Guangdong Zhanjiang, Zhanjiang, 524023, China.
| | - Chengtian Zhao
- Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China. .,Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266003, China. .,Sars-Fang Centre, Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China.
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Di Biagio C, Dellacqua Z, Martini A, Huysseune A, Scardi M, Witten PE, Boglione C. A Baseline for Skeletal Investigations in Medaka ( Oryzias latipes): The Effects of Rearing Density on the Postcranial Phenotype. Front Endocrinol (Lausanne) 2022; 13:893699. [PMID: 35846331 PMCID: PMC9281570 DOI: 10.3389/fendo.2022.893699] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 05/18/2022] [Indexed: 11/17/2022] Open
Abstract
Oryzias latipes is increasingly used as a model in biomedical skeletal research. The standard approach is to generate genetic variants with particular skeletal phenotypes which resemble skeletal diseases in humans. The proper diagnosis of skeletal variation is key for this type of research. However, even laboratory rearing conditions can alter skeletal phenotypes. The subject of this study is the link between skeletal phenotypes and rearing conditions. Thus, wildtype medaka were reared from hatching to an early juvenile stage at low (LD: 5 individuals/L), medium (MD: 15 individuals/L), and high (HD: 45 individuals/L) densities. The objectives of the study are: (I) provide a comprehensive overview of the postcranial skeletal elements in medaka; (II) evaluate the effects of rearing density on specific meristic counts and on the variability in type and incidence of skeletal anomalies; (III) define the best laboratory settings to obtain a skeletal reference for a sound evaluation of future experimental conditions; (IV) contribute to elucidating the structural and cellular changes related to the onset of skeletal anomalies. The results from this study reveal that rearing densities greater than 5 medaka/L reduce the animals' growth. This reduction is related to decreased mineralization of dermal (fin rays) and perichondral (fin supporting elements) bone. Furthermore, high density increases anomalies affecting the caudal fin endoskeleton and dermal rays, and the preural vertebral centra. A series of static observations on Alizarin red S whole mount-stained preural fusions provide insights into the etiology of centra fusion. The fusion of preural centra involves the ectopic formation of bony bridges over the intact intervertebral ligament. An apparent consequence is the degradation of the intervertebral ligaments and the remodeling and reshaping of the fused vertebral centra into a biconoid-shaped centrum. From this study it can be concluded that it is paramount to take into account the rearing conditions, natural variability, skeletal phenotypic plasticity, and the genetic background along with species-specific peculiarities when screening for skeletal phenotypes of mutant or wildtype medaka.
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Affiliation(s)
- Claudia Di Biagio
- PhD Program in Evolutionary Biology and Ecology, Department of Biology, University of Rome ‘Tor Vergata’, Rome, Italy
- Laboratory of Evolutionary Developmental Biology, Gent University, Department of Biology, Gent, Belgium
| | - Zachary Dellacqua
- PhD Program in Evolutionary Biology and Ecology, Department of Biology, University of Rome ‘Tor Vergata’, Rome, Italy
- Aquaculture Research Group (GIA), Universidad de Las Palmas de Gran Canaria, Institute of Sustainable Aquaculture and Marine Ecosystems (ECOAQUA), Las Palmas, Spain
| | - Arianna Martini
- Laboratory of Experimental Ecology and Aquaculture, University of Rome ‘Tor Vergata’, Department of Biology, Rome, Italy
| | - Ann Huysseune
- Laboratory of Evolutionary Developmental Biology, Gent University, Department of Biology, Gent, Belgium
| | - Michele Scardi
- Laboratory of Experimental Ecology and Aquaculture, University of Rome ‘Tor Vergata’, Department of Biology, Rome, Italy
| | - Paul Eckhard Witten
- Laboratory of Evolutionary Developmental Biology, Gent University, Department of Biology, Gent, Belgium
| | - Clara Boglione
- Laboratory of Experimental Ecology and Aquaculture, University of Rome ‘Tor Vergata’, Department of Biology, Rome, Italy
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Leafy and weedy seadragon genomes connect genic and repetitive DNA features to the extravagant biology of syngnathid fishes. Proc Natl Acad Sci U S A 2022; 119:e2119602119. [PMID: 35733255 PMCID: PMC9245644 DOI: 10.1073/pnas.2119602119] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Seadragons are widely recognized for their derived traits, which include leaf-like appendages and extreme spinal curvature. Efforts to understand the genetic basis of these unique traits and conserve these species and their relatives have been limited by genomic resource gaps. In this paper we present full, annotated genomes of leafy and weedy seadragons, which we use to uncover surprising features of gene family and genome architecture evolution that likely relate to the extravagant phenotypic traits of seadragons and their pipefish and seahorse relatives. These genomes and their analyses are important advances for the study of elaborate vertebrate traits, leveraging this diverse, morphologically exceptional group of fishes. Seadragons are a remarkable lineage of teleost fishes in the family Syngnathidae, renowned for having evolved male pregnancy. Comprising three known species, seadragons are widely recognized and admired for their fantastical body forms and coloration, and their specific habitat requirements have made them flagship representatives for marine conservation and natural history interests. Until recently, a gap has been the lack of significant genomic resources for seadragons. We have produced gene-annotated, chromosome-scale genome models for the leafy and weedy seadragon to advance investigations of evolutionary innovation and elaboration of morphological traits in seadragons as well as their pipefish and seahorse relatives. We identified several interesting features specific to seadragon genomes, including divergent noncoding regions near a developmental gene important for integumentary outgrowth, a high genome-wide density of repetitive DNA, and recent expansions of transposable elements and a vesicular trafficking gene family. Surprisingly, comparative analyses leveraging the seadragon genomes and additional syngnathid and outgroup genomes revealed striking, syngnathid-specific losses in the family of fibroblast growth factors (FGFs), which likely involve reorganization of highly conserved gene regulatory networks in ways that have not previously been documented in natural populations. The resources presented here serve as important tools for future evolutionary studies of developmental processes in syngnathids and hold value for conservation of the extravagant seadragons and their relatives.
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Muñoz-Montecinos C, Romero A, Sepúlveda V, Vira MÁ, Fehrmann-Cartes K, Marcellini S, Aguilera F, Caprile T, Fuentes R. Turning the Curve Into Straight: Phenogenetics of the Spine Morphology and Coordinate Maintenance in the Zebrafish. Front Cell Dev Biol 2022; 9:801652. [PMID: 35155449 PMCID: PMC8826430 DOI: 10.3389/fcell.2021.801652] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 12/31/2021] [Indexed: 12/13/2022] Open
Abstract
The vertebral column, or spine, provides mechanical support and determines body axis posture and motion. The most common malformation altering spine morphology and function is adolescent idiopathic scoliosis (AIS), a three-dimensional spinal deformity that affects approximately 4% of the population worldwide. Due to AIS genetic heterogenicity and the lack of suitable animal models for its study, the etiology of this condition remains unclear, thus limiting treatment options. We here review current advances in zebrafish phenogenetics concerning AIS-like models and highlight the recently discovered biological processes leading to spine malformations. First, we focus on gene functions and phenotypes controlling critical aspects of postembryonic aspects that prime in spine architecture development and straightening. Second, we summarize how primary cilia assembly and biomechanical stimulus transduction, cerebrospinal fluid components and flow driven by motile cilia have been implicated in the pathogenesis of AIS-like phenotypes. Third, we highlight the inflammatory responses associated with scoliosis. We finally discuss recent innovations and methodologies for morphometrically characterize and analyze the zebrafish spine. Ongoing phenotyping projects are expected to identify novel and unprecedented postembryonic gene functions controlling spine morphology and mutant models of AIS. Importantly, imaging and gene editing technologies are allowing deep phenotyping studies in the zebrafish, opening new experimental paradigms in the morphometric and three-dimensional assessment of spinal malformations. In the future, fully elucidating the phenogenetic underpinnings of AIS etiology in zebrafish and humans will undoubtedly lead to innovative pharmacological treatments against spinal deformities.
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Affiliation(s)
- Carlos Muñoz-Montecinos
- Departamento de Biología Celular, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
- Grupo de Procesos en Biología del Desarrollo (GDeP), Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
| | - Adrián Romero
- Departamento de Biología Celular, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
- Grupo de Procesos en Biología del Desarrollo (GDeP), Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
| | - Vania Sepúlveda
- Departamento de Biología Celular, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
- Grupo de Procesos en Biología del Desarrollo (GDeP), Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
| | - María Ángela Vira
- Departamento de Biología Celular, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
- Grupo de Procesos en Biología del Desarrollo (GDeP), Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
| | - Karen Fehrmann-Cartes
- Núcleo de Investigaciones Aplicadas en Ciencias Veterinarias y Agronómicas, Universidad de las Américas, Concepción, Chile
| | - Sylvain Marcellini
- Departamento de Biología Celular, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
- Grupo de Procesos en Biología del Desarrollo (GDeP), Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
| | - Felipe Aguilera
- Grupo de Procesos en Biología del Desarrollo (GDeP), Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
| | - Teresa Caprile
- Departamento de Biología Celular, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
- Grupo de Procesos en Biología del Desarrollo (GDeP), Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
| | - Ricardo Fuentes
- Departamento de Biología Celular, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
- Grupo de Procesos en Biología del Desarrollo (GDeP), Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
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Lv X, Xu J, Jiang J, Wu P, Tan R, Wang B. Genetic animal models of scoliosis: A systematical review. Bone 2021; 152:116075. [PMID: 34174503 DOI: 10.1016/j.bone.2021.116075] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 06/16/2021] [Accepted: 06/17/2021] [Indexed: 02/07/2023]
Abstract
Scoliosis is a complex disease with undetermined pathogenesis and has a strong relationship with genetics. Models of scoliosis in animals have been established for better comprehending its pathogenesis and treatment. In this review, we searched all the genetic animal models with body curvature in databases, and reviewed the related genes and scoliosis types. Meanwhile, we also summarized the pathogenesis of scoliosis reported so far. Summarizing the positive phenotypic animal models contributes to a better understanding on the pathogenesis of scoliosis and facilitates the selection of experimental models when a possible pathogenic factor is concerned.
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Affiliation(s)
- Xin Lv
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Jinghong Xu
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Jiajiong Jiang
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Pengfei Wu
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Renchun Tan
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Bing Wang
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China.
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Lahmar S, Kessabi K, Messaoudi I. Aphanius fasciatus: a molecular model of scoliosis? Spine Deform 2021; 9:883-892. [PMID: 33512704 DOI: 10.1007/s43390-021-00291-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 01/15/2021] [Indexed: 11/25/2022]
Abstract
STUDY DESIGN Observational study of Killifish with spinal deformities OBJECTIVE: To evaluate the morphology and molecular biology of Aphanius fasciatus with severe spine deformities. Idiopathic Scoliosis affects 3% of the population and is an abnormal three-dimensional curvature of the spine with unknown cause. The lack of a model system with naturally occurring spinal curvatures has hindered research on the etiology of IS. METHODS The Mediterranean killifish Aphanius fasciatus, collected from the coast of Sfax (Tunisia), which has an inborn skeletal deformity was chosen. We used morphologic features to evaluate the severity of scoliosis according to the different types and performed a biochemical analysis using factors previously studied in humans (estradiol, melatonin and Insulin Growth Factor 1 "IGF-1"). RESULTS We have detected relevant molecular deviations that occur in Killifish deformities and the fish with severe scoliosis are smaller and less old than the ones with milder scolioses. Furthermore, a significant change in levels of ovarian estradiol, liver IGF-1 and brain melatonin was noted between deformed and normal fish. CONCLUSIONS Aphanius fasciatus could be used as a molecular model system to study the etiology of IS in humans as the characterization of the Aphanius fasciatus scoliosis syndrome has revealed morphological and biochemical parallels to IS. However, it is important to note the limitations of the proposed model, including the short lifespan of the fish. LEVEL OF EVIDENCE III.
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Affiliation(s)
- Samar Lahmar
- Université de Monastir, Institut Supérieur de Biotechnologie de Monastir, Laboratoire LR11ES41 Génétique Biodiversité et Valorisation des Bio-Ressources, 5000, Monastir, Tunisie.
| | - Kaouthar Kessabi
- Université de Monastir, Institut Supérieur de Biotechnologie de Monastir, Laboratoire LR11ES41 Génétique Biodiversité et Valorisation des Bio-Ressources, 5000, Monastir, Tunisie
| | - Imed Messaoudi
- Université de Monastir, Institut Supérieur de Biotechnologie de Monastir, Laboratoire LR11ES41 Génétique Biodiversité et Valorisation des Bio-Ressources, 5000, Monastir, Tunisie
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Zaydman AM, Strokova EL, Pahomova NY, Gusev AF, Mikhaylovskiy MV, Shevchenko AI, Zaidman MN, Shilo AR, Subbotin VM. Etiopathogenesis of adolescent idiopathic scoliosis: Review of the literature and new epigenetic hypothesis on altered neural crest cells migration in early embryogenesis as the key event. Med Hypotheses 2021; 151:110585. [PMID: 33932710 DOI: 10.1016/j.mehy.2021.110585] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 02/28/2021] [Accepted: 03/24/2021] [Indexed: 12/17/2022]
Abstract
Adolescent idiopathic scoliosis (AIS) affects 2-3% of children. Numerous hypotheses on etiologic/causal factors of AIS were investigated, but all failed to identify therapeutic targets and hence failed to offer a cure. Therefore, currently there are only two options to minimize morbidity of the patients suffering AIS: bracing and spinal surgery. From the beginning of 1960th, spinal surgery, both fusion and rod placement, became the standard of management for progressive adolescent idiopathic spine deformity. However, spinal surgery is often associated with complications. These circumstances motivate AIS scientific community to continue the search for new etiologic and causal factors of AIS. While the role of the genetic factors in AIS pathogenesis was investigated intensively and universally recognized, these studies failed to nominate mutation of a particular gene or genes combination responsible for AIS development. More recently epigenetic factors were suggested to play causal role in AIS pathogenesis. Sharing this new approach, we investigated scoliotic vertebral growth plates removed during vertebral fusion (anterior surgery) for AIS correction. In recent publications we showed that cells from the convex side of human scoliotic deformities undergo normal chondrogenic/osteogenic differentiation, while cells from the concave side acquire a neuronal phenotype. Based on these facts we hypothesized that altered neural crest cell migration in early embryogenesis can be the etiological factor of AIS. In particular, we suggested that neural crest cells failed to migrate through the anterior half of somites and became deposited in sclerotome, which in turn produced chondrogenic/osteogenic-insufficient vertebral growth plates. To test this hypothesis we conducted experiments on chicken embryos with arrest neural crest cell migration by inhibiting expression of Paired-box 3 (Pax3) gene, a known enhancer and promoter of neural crest cells migration and differentiation. The results showed that chicken embryos treated with Pax3 siRNA (microinjection into the neural tube, 44 h post-fertilization) progressively developed scoliotic deformity during maturation. Therefore, this analysis suggests that although adolescent idiopathic scoliosis manifests in children around puberty, the real onset of the disease is of epigenetic nature and takes place in early embryogenesis and involves altered neural crest cells migration. If these results confirmed and further elaborated, the hypothesis may shed new light on the etiology and pathogenesis of AIS.
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Affiliation(s)
- Alla M Zaydman
- Novosibirsk Research Institute of Traumatology and Orthopaedics named after Ya.L. Tsivyan, Novosibirsk, Russia
| | - Elena L Strokova
- Novosibirsk Research Institute of Traumatology and Orthopaedics named after Ya.L. Tsivyan, Novosibirsk, Russia
| | - Nataliya Y Pahomova
- Novosibirsk Research Institute of Traumatology and Orthopaedics named after Ya.L. Tsivyan, Novosibirsk, Russia
| | - Arkady F Gusev
- Novosibirsk Research Institute of Traumatology and Orthopaedics named after Ya.L. Tsivyan, Novosibirsk, Russia
| | - Mikhail V Mikhaylovskiy
- Novosibirsk Research Institute of Traumatology and Orthopaedics named after Ya.L. Tsivyan, Novosibirsk, Russia
| | - Alexander I Shevchenko
- Institute of Cytology and Genetics of the Siberian Branch of the Russian Academy of Sciences", Novosibirsk, Russia
| | | | - Andrey R Shilo
- Novosibirsk Zoo named after R.A. Shilo, Novosibirsk, Russia
| | - Vladimir M Subbotin
- Arrowhead Pharmaceuticals Inc., Madison WI, USA; University of Pittsburgh, Pittsburgh PA, USA; University of Wisconsin, Madison WI, USA.
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11
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Smit TH. Adolescent idiopathic scoliosis: The mechanobiology of differential growth. JOR Spine 2020; 3:e1115. [PMID: 33392452 PMCID: PMC7770204 DOI: 10.1002/jsp2.1115] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 07/02/2020] [Indexed: 12/16/2022] Open
Abstract
Adolescent idiopathic scoliosis (AIS) has been linked to neurological, genetic, hormonal, microbial, and environmental cues. Physically, however, AIS is a structural deformation, hence an adequate theory of etiology must provide an explanation for the forces involved. Earlier, we proposed differential growth as a possible mechanism for the slow, three-dimensional deformations observed in AIS. In the current perspective paper, the underlying mechanobiology of cells and tissues is explored. The musculoskeletal system is presented as a tensegrity-like structure, in which the skeletal compressive elements are stabilized by tensile muscles, ligaments, and fasciae. The upright posture of the human spine requires minimal muscular energy, resulting in less compression, and stability than in quadrupeds. Following Hueter-Volkmann Law, less compression allows for faster growth of vertebrae and intervertebral discs. The substantially larger intervertebral disc height observed in AIS patients suggests high intradiscal pressure, a condition favorable for notochordal cells; this promotes the production of proteoglycans and thereby osmotic pressure. Intradiscal pressure overstrains annulus fibrosus and longitudinal ligaments, which are then no longer able to remodel and grow, and consequently induce differential growth. Intradiscal pressure thus is proposed as the driver of AIS and may therefore be a promising target for prevention and treatment.
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Affiliation(s)
- Theodoor H. Smit
- Department of Orthopaedic SurgeryAmsterdam Movement Sciences, Amsterdam University Medical CentresAmsterdamNetherlands
- Department of Medical BiologyAmsterdam University Medical CentresAmsterdamNetherlands
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12
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Mueller M, Sternecker K, Milz S, Geist J. Assessing turbine passage effects on internal fish injury and delayed mortality using X-ray imaging. PeerJ 2020; 8:e9977. [PMID: 32995098 PMCID: PMC7501806 DOI: 10.7717/peerj.9977] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 08/26/2020] [Indexed: 11/28/2022] Open
Abstract
Knowledge on the extent and mechanisms of fish damage caused by hydropower facilities is important for the conservation of fish populations. Herein, we assessed the effects of hydropower turbine passage on internal fish injuries using X-ray technology. A total of 902 specimens from seven native European fish species were screened for 36 types of internal injuries and 86 external injuries evaluated with a previously published protocol. The applied systematic visual evaluation of X-ray images successfully detected skeletal injuries, swim bladder anomalies, emphysema, free intraperitoneal gas and hemorrhages. Injuries related to handling and to impacts of different parts of the hydropower structure could be clearly distinguished applying multivariate statistics and the data often explained delayed mortality within 96 h after turbine passage. The internal injuries could clearly be assigned to specific physical impacts resulting from turbine passage such as swim bladder rupture due to abrupt pressure change or fractures of skeletal parts due to blade-strike, fluid shear or severe turbulence. Generally, internal injuries were rarely depicted by external evaluation. For example, 29% of individuals with vertebral fractures did not present externally visible signs of severe injury. A combination of the external and internal injury evaluation allows quantifying and comparing fish injuries across sites, and can help to identify the technologies and operational procedures which minimize harm to fish in the context of assessing hydropower-related fish injuries as well as in assessing fish welfare.
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Affiliation(s)
- Melanie Mueller
- Aquatic Systems Biology Unit, Department of Ecology and Ecosystem Management, Technical University of Munich, Freising, Bavaria, Germany
| | | | - Stefan Milz
- Institute of Anatomy, Faculty of Medicine, LMU Munich, Munich, Bavaria, Germany
| | - Juergen Geist
- Aquatic Systems Biology Unit, Department of Ecology and Ecosystem Management, Technical University of Munich, Freising, Bavaria, Germany
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13
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Skuplik I, Cobb J. Animal Models for Understanding Human Skeletal Defects. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1236:157-188. [DOI: 10.1007/978-981-15-2389-2_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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14
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Homans JF, de Reuver S, Breetvelt EJ, Vorstman JAS, Deeney VFX, Flynn JM, McDonald-McGinn DM, Kruyt MC, Castelein RM. The 22q11.2 deletion syndrome as a model for idiopathic scoliosis - A hypothesis. Med Hypotheses 2019; 127:57-62. [PMID: 31088649 DOI: 10.1016/j.mehy.2019.03.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 03/18/2019] [Accepted: 03/26/2019] [Indexed: 12/29/2022]
Abstract
Adolescent idiopathic scoliosis (AIS), defined as a lateral deviation of the spine of at least ten degrees, is a classic enigma in orthopaedics and affects 1-4% of the general population. Despite (over) a century of intensive research, the etiology is still largely unknown. One of the major problems in all existing AIS research is the fact that most patients come to medical attention after onset of the curve. Therefore, it is impossible to know whether current investigated parameters are causative, or an effect of the scoliosis. Moreover, up until now there is no known animal model that captures the core features of AIS. In order to identify causal pathways leading to AIS we propose another approach, which has been of great value in other medical disciplines: To use a subset of the population, with a higher risk for a certain disease as a "model" for the general population. Such a "model" may allow the identification of causative mechanisms that might be applicable to the general population. The 22q11.2 deletion syndrome (22q11.2DS) is the most common microdeletion syndrome and occurs in ∼1:3000-6000 children and 1:1000 pregnancies. Nearly half of the population of patients with 22q11.2DS develop a scoliosis that in most cases resembles AIS as far as age at onset and curve pattern. We postulate that within 22q11.2DS certain causal pathways leading to scoliosis can be identified and that these are applicable to the general population.
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Affiliation(s)
- Jelle F Homans
- Department of Orthopaedic Surgery, University Medical Center Utrecht, Utrecht, The Netherlands.
| | - Steven de Reuver
- Department of Orthopaedic Surgery, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Elemi J Breetvelt
- Department of Psychiatry, Hospital for Sick Children, Toronto, Canada
| | | | - Vincent F X Deeney
- Department of Orthopaedic Surgery, The Children's Hospital of Philadelphia (CHOP) and The Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - John M Flynn
- Department of Orthopaedic Surgery, The Children's Hospital of Philadelphia (CHOP) and The Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Donna M McDonald-McGinn
- Division of Human Genetics and 22q and You Center, Children's Hospital of Philadelphia and Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Moyo C Kruyt
- Department of Orthopaedic Surgery, University Medical Center Utrecht, Utrecht, The Netherlands
| | - René M Castelein
- Department of Orthopaedic Surgery, University Medical Center Utrecht, Utrecht, The Netherlands.
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15
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Fadzan M, Bettany-Saltikov J. Etiological Theories of Adolescent Idiopathic Scoliosis: Past and Present. Open Orthop J 2017; 11:1466-1489. [PMID: 29399224 PMCID: PMC5759107 DOI: 10.2174/1874325001711011466] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 09/01/2017] [Accepted: 09/11/2017] [Indexed: 12/11/2022] Open
Abstract
Adolescent idiopathic scoliosis is one of the most common spinal deformities, yet its cause is unknown. Various theories look to biomechanical, neuromuscular, genetic, and environmental origins, yet our understanding of scoliosis etiology is still limited. Determining the cause of a disease is crucial to developing the most effective treatment. Associations made with scoliosis do not necessarily point to causality, and it is difficult to determine whether said associations are primary (playing a role in development) or secondary (develop as a result of scoliosis). Scoliosis is a complex condition with highly variable expression, even among family members, and likely has many causes. These causes could be similar among homogenous groups of AIS patients, or they could be individual. Here, we review the most prevalent theories of scoliosis etiology and recent trends in research.
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Affiliation(s)
- Maja Fadzan
- Scoliosis 3DC, 3 Baldwin Green Common, Suite 204, Woburn, MA 01801, USA
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16
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Understanding Idiopathic Scoliosis: A New Zebrafish School of Thought. Trends Genet 2017; 33:183-196. [DOI: 10.1016/j.tig.2017.01.001] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 01/03/2017] [Accepted: 01/06/2017] [Indexed: 12/28/2022]
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17
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Irie K, Kuroda Y, Mimori N, Hayashi S, Abe M, Tsuji N, Sugiyama A, Furukawa S. Histopathology of a wavy medaka. J Toxicol Pathol 2016; 29:115-8. [PMID: 27182116 PMCID: PMC4866008 DOI: 10.1293/tox.2015-0070] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 01/20/2016] [Indexed: 11/19/2022] Open
Abstract
Wavy medakas are medakas that exhibit spinal curvature characterized by dorsoventrally curved vertebrae. We found a spontaneous wavy medaka in our experimental stock and subjected it to a histopathological examination. Macroscopically, the wavy medaka’s spine formed an M shape, and its vertebrae displayed a dorsoventral curvature that started at the third vertebral bone. Microscopically, the vertebral cavities were filled with fibrous tissue, which was similar to that seen in the central parts of the intervertebral discs of a normal medaka. The vertebral joints were composed of vacuolated notochord cells without intervertebral disc formation. These changes were also observed in the caudal region, which exhibited less curvature. In the normal medaka, the intervertebral discs form via the regression of the notochord that plays a key role in the development of vertebrae and disc formation. We concluded that notochordal subinvolution had induced intervertebral disc dysplasia, leading to lordokyphosis, in the wavy medaka.
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Affiliation(s)
- Kota Irie
- Biological Research Laboratories, Nissan Chemical Industries, Ltd., 1470 Shiraoka, Shiraoka, Saitama 349-0294, Japan
| | - Yusuke Kuroda
- Biological Research Laboratories, Nissan Chemical Industries, Ltd., 1470 Shiraoka, Shiraoka, Saitama 349-0294, Japan
| | - Norihiko Mimori
- Biological Research Laboratories, Nissan Chemical Industries, Ltd., 1470 Shiraoka, Shiraoka, Saitama 349-0294, Japan
| | - Seigo Hayashi
- Biological Research Laboratories, Nissan Chemical Industries, Ltd., 1470 Shiraoka, Shiraoka, Saitama 349-0294, Japan
| | - Masayoshi Abe
- Biological Research Laboratories, Nissan Chemical Industries, Ltd., 1470 Shiraoka, Shiraoka, Saitama 349-0294, Japan
| | - Naho Tsuji
- Biological Research Laboratories, Nissan Chemical Industries, Ltd., 1470 Shiraoka, Shiraoka, Saitama 349-0294, Japan
| | - Akihiko Sugiyama
- Department of Veterinary Laboratory Medicine, School of Veterinary Medicine, Faculty of Agriculture, Tottori University Biological Research Laboratories, 4-101 Minami, Koyama, Tottori 680-8550, Japan
| | - Satoshi Furukawa
- Biological Research Laboratories, Nissan Chemical Industries, Ltd., 1470 Shiraoka, Shiraoka, Saitama 349-0294, Japan
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18
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Guo L, Yamashita H, Kou I, Takimoto A, Meguro-Horike M, Horike SI, Sakuma T, Miura S, Adachi T, Yamamoto T, Ikegawa S, Hiraki Y, Shukunami C. Functional Investigation of a Non-coding Variant Associated with Adolescent Idiopathic Scoliosis in Zebrafish: Elevated Expression of the Ladybird Homeobox Gene Causes Body Axis Deformation. PLoS Genet 2016; 12:e1005802. [PMID: 26820155 PMCID: PMC4731154 DOI: 10.1371/journal.pgen.1005802] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 12/21/2015] [Indexed: 11/23/2022] Open
Abstract
Previously, we identified an adolescent idiopathic scoliosis susceptibility locus near human ladybird homeobox 1 (LBX1) and FLJ41350 by a genome-wide association study. Here, we characterized the associated non-coding variant and investigated the function of these genes. A chromosome conformation capture assay revealed that the genome region with the most significantly associated single nucleotide polymorphism (rs11190870) physically interacted with the promoter region of LBX1-FLJ41350. The promoter in the direction of LBX1, combined with a 590-bp region including rs11190870, had higher transcriptional activity with the risk allele than that with the non-risk allele in HEK 293T cells. The ubiquitous overexpression of human LBX1 or either of the zebrafish lbx genes (lbx1a, lbx1b, and lbx2), but not FLJ41350, in zebrafish embryos caused body curvature followed by death prior to vertebral column formation. Such body axis deformation was not observed in transcription activator-like effector nucleases mediated knockout zebrafish of lbx1b or lbx2. Mosaic expression of lbx1b driven by the GATA2 minimal promoter and the lbx1b enhancer in zebrafish significantly alleviated the embryonic lethal phenotype to allow observation of the later onset of the spinal curvature with or without vertebral malformation. Deformation of the embryonic body axis by lbx1b overexpression was associated with defects in convergent extension, which is a component of the main axis-elongation machinery in gastrulating embryos. In embryos overexpressing lbx1b, wnt5b, a ligand of the non-canonical Wnt/planar cell polarity (PCP) pathway, was significantly downregulated. Injection of mRNA for wnt5b or RhoA, a key downstream effector of Wnt/PCP signaling, rescued the defective convergent extension phenotype and attenuated the lbx1b-induced curvature of the body axis. Thus, our study presents a novel pathological feature of LBX1 and its zebrafish homologs in body axis deformation at various stages of embryonic and subsequent growth in zebrafish. Scoliosis is the most common type of spinal deformity with a lateral spinal curvature of at least 10 degrees, affecting 2–4% of the population. Scoliosis caused by a primary problem related to the spine itself is classified into congenital scoliosis (CS) and idiopathic scoliosis (IS). Among these, adolescent idiopathic scoliosis (AIS), the most common form of scoliosis, is known as a common polygenic disease. Severe curving of the spine in scoliosis leads to profound psychological and social impacts, but etiology-based therapies have not been established since the precise pathological mechanisms of both IS and CS remain undefined. Previously, we identified an AIS susceptibility locus near human ladybird homeobox 1 (LBX1) by a genome-wide association study. Here, we report the functional characterization of the most significantly associated single nucleotide polymorphism (SNP), rs11190870 and LBX1 as well as its zebrafish homologues. Overexpression of LBX1 and zebrafish lbx genes caused lateral body curvature in association with the impairment of non-canonical Wnt/planar cell polarity signaling. Thus, our study presents a novel pathological feature of LBX1 in body axis deformation.
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Affiliation(s)
- Long Guo
- Department of Cellular Differentiation, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Hiroshi Yamashita
- Department of Molecular Biology and Biochemistry, Division of Basic Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Ikuyo Kou
- Laboratory for Bone and Joint Diseases, RIKEN Center for Integrative Medical Sciences, Tokyo, Japan
| | - Aki Takimoto
- Department of Cellular Differentiation, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Makiko Meguro-Horike
- Division of Functional Genomics, Advanced Science Research Center, Kanazawa University, Kanazawa, Japan
| | - Shin-ichi Horike
- Division of Functional Genomics, Advanced Science Research Center, Kanazawa University, Kanazawa, Japan
| | - Tetsushi Sakuma
- Department of Mathematical and Life Sciences, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Shigenori Miura
- Department of Cellular Differentiation, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Taiji Adachi
- Department of Biomechanics, Research Center for Nano Medical Engineering, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Takashi Yamamoto
- Department of Mathematical and Life Sciences, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Shiro Ikegawa
- Laboratory for Bone and Joint Diseases, RIKEN Center for Integrative Medical Sciences, Tokyo, Japan
| | - Yuji Hiraki
- Department of Cellular Differentiation, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Chisa Shukunami
- Department of Cellular Differentiation, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
- Department of Molecular Biology and Biochemistry, Division of Basic Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
- * E-mail:
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19
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Arbuatti A, Della Salda L, Romanucci M. Spinal deformities in a wild line of Poecilia wingei bred in captivity: report of cases and review of the literature. Asian Pac J Trop Biomed 2015; 3:186-90. [PMID: 23620835 DOI: 10.1016/s2221-1691(13)60047-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2013] [Accepted: 02/12/2013] [Indexed: 10/27/2022] Open
Abstract
OBJECTIVE To describe the occurrence of various spinal deformations in a captive-bred wild line of Poecilia wingei (P. wingei). METHODS Fish belonging to a wild line of P. wingei caught from Laguna de Los Patos, Venezuela, were bred in an aquarium home-breeding system during a period of three years (2006-2009). The spinal curvature was observed to study spinal deformities in P. wingei. RESULTS Out of a total of 600 fish, 22 showed different types of deformities (scoliosis, lordosis, kyphosis), with a higher incidence in females. Growth, swimming and breeding of deformed fish were generally normal. CONCLUSIONS Possible causes for spinal curvature in fish are discussed on the basis of the current literature. While it is not possible to determine the exact cause(s) of spinal deformities observed in the present study, traumatic injuries, nutritional imbalances, genetic defects or a combination of these factors can be supposed to be involved in the pathogenesis of such lesions.
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20
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Sharma S, Londono D, Eckalbar WL, Gao X, Zhang D, Mauldin K, Kou I, Takahashi A, Matsumoto M, Kamiya N, Murphy KK, Cornelia R, Herring JA, Burns D, Ahituv N, Ikegawa S, Gordon D, Wise CA. A PAX1 enhancer locus is associated with susceptibility to idiopathic scoliosis in females. Nat Commun 2015; 6:6452. [PMID: 25784220 PMCID: PMC4365504 DOI: 10.1038/ncomms7452] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 01/30/2015] [Indexed: 12/12/2022] Open
Abstract
Idiopathic scoliosis (IS) is a common paediatric musculoskeletal disease that displays a strong female bias. By performing a genome-wide association study (GWAS) of 3,102 individuals, we identify significant associations with 20p11.22 SNPs for females (P=6.89 × 10−9) but not males (P=0.71). This association with IS is also found in independent female cohorts from the United States of America and Japan (overall P=2.15 × 10−10, OR=1.30 (rs6137473)). Unexpectedly, the 20p11.22 IS risk alleles were previously associated with protection from early-onset alopecia, another sexually dimorphic condition. The 174-kb associated locus is distal to PAX1, which encodes paired box 1, a transcription factor involved in spine development. We identify a sequence in the associated locus with enhancer activity in zebrafish somitic muscle and spinal cord, an activity that is abolished by IS-associated SNPs. We thus identify a sexually dimorphic IS susceptibility locus, and propose the first functionally defined candidate mutations in an enhancer that may regulate expression in specific spinal cells. Girls are tenfold more likely than boys to require surgical treatment for idiopathic scoliosis, a common paediatric skeletal disorder. Here, Sharma et al. identify the first sexually dimorphic idiopathic scoliosis risk locus, and demonstrate that it may play a role in the regulation of spinal cells.
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Affiliation(s)
- Swarkar Sharma
- Sarah M. and Charles E. Seay Center for Musculoskeletal Research, Research Department, Texas Scottish Rite Hospital for Children, Dallas, Texas 75219, USA
| | - Douglas Londono
- Department of Genetics and Human Genetics Institute, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Walter L Eckalbar
- Department of Bioengineering and Therapeutic Sciences, Institute for Human Genetics, University of California San Francisco, San Francisco, California 94143, USA
| | - Xiaochong Gao
- Sarah M. and Charles E. Seay Center for Musculoskeletal Research, Research Department, Texas Scottish Rite Hospital for Children, Dallas, Texas 75219, USA
| | - Dongping Zhang
- Sarah M. and Charles E. Seay Center for Musculoskeletal Research, Research Department, Texas Scottish Rite Hospital for Children, Dallas, Texas 75219, USA
| | - Kristen Mauldin
- Sarah M. and Charles E. Seay Center for Musculoskeletal Research, Research Department, Texas Scottish Rite Hospital for Children, Dallas, Texas 75219, USA
| | - Ikuyo Kou
- Laboratory of Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo 108-8639, Japan
| | - Atsushi Takahashi
- Laboratory for Statistical Analysis, Center for Integrative Medical Sciences, RIKEN, Yokohama 230-0045, Japan
| | - Morio Matsumoto
- Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo 108-8345, Japan
| | - Nobuhiro Kamiya
- Sarah M. and Charles E. Seay Center for Musculoskeletal Research, Research Department, Texas Scottish Rite Hospital for Children, Dallas, Texas 75219, USA
| | - Karl K Murphy
- Department of Bioengineering and Therapeutic Sciences, Institute for Human Genetics, University of California San Francisco, San Francisco, California 94143, USA
| | - Reuel Cornelia
- Sarah M. and Charles E. Seay Center for Musculoskeletal Research, Research Department, Texas Scottish Rite Hospital for Children, Dallas, Texas 75219, USA
| | | | | | - John A Herring
- 1] Department of Orthopaedics, Texas Scottish Rite Hospital for Children, Dallas, Texas 75219, USA [2] Department of Orthopaedic Surgery, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390, USA
| | - Dennis Burns
- Department of Pathology, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390, USA
| | - Nadav Ahituv
- Department of Bioengineering and Therapeutic Sciences, Institute for Human Genetics, University of California San Francisco, San Francisco, California 94143, USA
| | - Shiro Ikegawa
- Laboratory of Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo 108-8639, Japan
| | - Derek Gordon
- Department of Genetics and Human Genetics Institute, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Carol A Wise
- 1] Sarah M. and Charles E. Seay Center for Musculoskeletal Research, Research Department, Texas Scottish Rite Hospital for Children, Dallas, Texas 75219, USA [2] Department of Orthopaedic Surgery, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390, USA [3] McDermott Center for Human Growth and Development, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390, USA [4] McDermott Center for Human Growth and Development, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390, USA
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21
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Buchan JG, Gray RS, Gansner JM, Alvarado DM, Burgert L, Gitlin JD, Gurnett CA, Goldsmith MI. Kinesin family member 6 (kif6) is necessary for spine development in zebrafish. Dev Dyn 2014; 243:1646-57. [PMID: 25283277 DOI: 10.1002/dvdy.24208] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Revised: 09/16/2014] [Accepted: 09/25/2014] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Idiopathic scoliosis is a form of spinal deformity that affects 2-3% of children and results in curvature of the spine without structural defects of the vertebral units. The pathogenesis of idiopathic scoliosis remains poorly understood, in part due to the lack of a relevant animal model. RESULTS We performed a forward mutagenesis screen in zebrafish to identify new models for idiopathic scoliosis. We isolated a recessive zebrafish mutant, called skolios, which develops isolated spinal curvature that arises independent of vertebral malformations. Using meiotic mapping and whole genome sequencing, we identified a nonsense mutation in kinesin family member 6 (kif6(gw326) ) unique to skolios mutants. Three additional kif6 frameshift alleles (gw327, gw328, gw329) were generated with transcription activator-like effector nucleases (TALENs). Zebrafish homozygous or compound heterozygous for kif6 frameshift mutations developed a scoliosis phenotype indistinguishable from skolios mutants, confirming that skolios is caused by the loss of kif6. Although kif6 may play a role in cilia, no evidence for cilia dysfunction was seen in kif6(gw326) mutants. CONCLUSIONS Overall, these findings demonstrate a novel role for kif6 in spinal development and identify a new candidate gene for human idiopathic scoliosis.
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Affiliation(s)
- Jillian G Buchan
- Department of Genetics, Washington University School of Medicine, St. Louis, Missouri
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ptk7 mutant zebrafish models of congenital and idiopathic scoliosis implicate dysregulated Wnt signalling in disease. Nat Commun 2014; 5:4777. [PMID: 25182715 PMCID: PMC4155517 DOI: 10.1038/ncomms5777] [Citation(s) in RCA: 104] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 07/23/2014] [Indexed: 01/09/2023] Open
Abstract
Scoliosis is a complex genetic disorder of the musculoskeletal system, characterized by three-dimensional rotation of the spine. Curvatures caused by malformed vertebrae (congenital scoliosis (CS)) are apparent at birth. Spinal curvatures with no underlying vertebral abnormality (idiopathic scoliosis (IS)) most commonly manifest during adolescence. The genetic and biological mechanisms responsible for IS remain poorly understood due largely to limited experimental models. Here we describe zygotic ptk7 (Zptk7) mutant zebrafish, deficient in a critical regulator of Wnt signalling, as the first genetically defined developmental model of IS. We identify a novel sequence variant within a single IS patient that disrupts PTK7 function, consistent with a role for dysregulated Wnt activity in disease pathogenesis. Furthermore, we demonstrate that embryonic loss-of-gene function in maternal-zygotic ptk7 mutants (MZptk7) leads to vertebral anomalies associated with CS. Our data suggest novel molecular origins of, and genetic links between, congenital and idiopathic forms of disease. Scoliosis is a complex genetic disorder characterized by spinal curvature. Here, the authors present experimental zebrafish models of idiopathic and congenital scoliosis and suggest a role for dysregulated Wnt activity in scoliosis aetiology.
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Fish: a suitable system to model human bone disorders and discover drugs with osteogenic or osteotoxic activities. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.ddmod.2014.08.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Identification of the relationships between sagittal plane and coronal plane curvature in guppy models. Int J Surg 2013; 12:41-4. [PMID: 24215817 DOI: 10.1016/j.ijsu.2013.10.015] [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: 09/02/2013] [Revised: 10/11/2013] [Accepted: 10/31/2013] [Indexed: 11/21/2022]
Abstract
OBJECTIVE To explore the relationship between sagittal plane and coronal plane curvatures in guppies by investigating the curvature angles of sagittal and sagittal-coronal guppies. METHODS After mating between 1000 spinal curvature guppies, 124 guppies (3-month old) were screened from progenies for the present study. Photos of all fishes were taken and the sagittal and coronal angles were calculated via angle measure tool of Photoshop 12.0 software. All data were analyzed by SPSS 11.0. RESULTS In sagittal and sagittal-coronal curvature guppies, there was a significant linear correlation between sagittal angles and coronal angles. In 48 sagittal-coronal curvatures, their sagittal angles were above 40°, meanwhile, in 76 sagittal guppies, their sagittal angles were mostly below 40°. CONCLUSIONS These findings indicated that the occurrence of coronal curvature might be later than sagittal curvature and could be influenced by other factors. Sagittal angles 40° might be involved in the onset of coronal curvature.
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Ouellet J, Odent T. Animal models for scoliosis research: state of the art, current concepts and future perspective applications. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2013; 22 Suppl 2:S81-95. [PMID: 23099524 PMCID: PMC3616476 DOI: 10.1007/s00586-012-2396-7] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Revised: 05/21/2012] [Accepted: 05/28/2012] [Indexed: 11/24/2022]
Abstract
PURPOSE The purpose of this study was to provide the readers with a reliable source of animal models currently being utilized to perform state-of-the-art scoliotic research. MATERIALS AND METHODS A comprehensive search was undertaken to review all publications on animal models for the study of scoliosis within the database from 1946 to January 2011. RESULTS The animal models have been grouped under specific headings reflecting the underlying pathophysiology behind the development of the spinal deformities produced in the animals: genetics, neuroendocrine, neuromuscular, external constraints, internal constraints with or without tissue injury, vertebral growth modulation and iatrogenic congenital malformations, in an attempt to organize and classify these multiple scoliotic animal models. As it stands, there are no animal models that mimic the human spinal anatomy with all its constraints and weaknesses, which puts it at risk of developing scoliosis. What we do have are a multitude of models, which produce spinal deformities that come close to the idiopathic scoliosis deformity. CONCLUSION All these different animal models compel us to believe that the clinical phenotype of what we call idiopathic scoliosis may well be caused by a variety of different underlying pathologies.
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Affiliation(s)
- Jean Ouellet
- />McGill Scoliosis and Spinal Research Chair, Deputy Chief Shriners Hospital, Montreal, Canada
- />Division of Orthopaedic Surgery, McGill University Health Hospital, Centre, Montreal Children Hospital, 2300 Tupper Street, Montreal, QC H3H 1P3 Canada
| | - Thierry Odent
- />Department of Orthopaedic Surgery, Hopital des Enfants Malade, Necker, Paris Descartes, France
- />Université Paris Descartes - Sorbonne Paris Cité - Service d’orthopédie pédiatrique - Hôpital Universitaire Necker - Enfants-Malades, Paris, France
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The creation of scoliosis by scapula-to-contralateral ilium tethering procedure in bipedal rats: a kyphoscoliosis model. Spine (Phila Pa 1976) 2011; 36:1340-9. [PMID: 21224778 DOI: 10.1097/brs.0b013e3181f3d164] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Randomized trial. OBJECTIVE To create a new scoliotic model. SUMMARY OF BACKGROUND DATA Although there were a lot of modeling techniques producing scoliosis, failed was the creation of a scoliotic animal model all characterized by the evident axial rotation of vertebrae body, the simulation of the human erect posture, and avoiding direct traumas to the spine, the spinal cord, ribs, or glands in modeling techniques. METHODS A total of 45 4-week-old female wistar rats were randomly divided into three groups. Group 1 underwent subcutaneous left scapula-to-contralateral ilium tethering procedure with a nonadsorbable suture, which made the spine convex toward right side, and then removed forelimbs and tails of rats to create the bipedal rats. Tethering sutures were cut at postoperative eighth week, and the spines of rats were then observed during 2 weeks. Group 2 was the same as group 1 but in which scapula-to-ipsilateral ilium tethering procedure was performed. Group 3 was the same as group 1 except that the bipedal rats were not created. All postoperative rats were fed separately in special high cages for groups 1 and 2 or in standard cages for group 3. RESULTS At 2 weeks after tether release, the incidence of vertebral rotation was significantly higher in group 1 than in group 2 (P = 0.004). The differences in degrees of scoliosis and kyphosis between groups at the time of initial tethering were not found to be significant (P > 0.05), whereas those at 2 weeks after tether release were significantly larger in group 1 than in group 3 (P < 0.01). There were no significant differences in postoperative first food-taking duration, body weight, spinal relative length, modeling mortality, the incidences of reoperation, and scoliosis between groups (all P > 0.05). CONCLUSION The scoliotic model created by scapula-to-contralateral ilium tethering procedure in bipedal rats can preferably simulate the human scoliosis.
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Gorman KF, Christians JK, Parent J, Ahmadi R, Weigel D, Dreyer C, Breden F. A major QTL controls susceptibility to spinal curvature in the curveback guppy. BMC Genet 2011; 12:16. [PMID: 21269476 PMCID: PMC3039624 DOI: 10.1186/1471-2156-12-16] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 01/26/2011] [Indexed: 01/14/2023] Open
Abstract
Background Understanding the genetic basis of heritable spinal curvature would benefit medicine and aquaculture. Heritable spinal curvature among otherwise healthy children (i.e. Idiopathic Scoliosis and Scheuermann kyphosis) accounts for more than 80% of all spinal curvatures and imposes a substantial healthcare cost through bracing, hospitalizations, surgery, and chronic back pain. In aquaculture, the prevalence of heritable spinal curvature can reach as high as 80% of a stock, and thus imposes a substantial cost through production losses. The genetic basis of heritable spinal curvature is unknown and so the objective of this work is to identify quantitative trait loci (QTL) affecting heritable spinal curvature in the curveback guppy. Prior work with curveback has demonstrated phenotypic parallels to human idiopathic-type scoliosis, suggesting shared biological pathways for the deformity. Results A major effect QTL that acts in a recessive manner and accounts for curve susceptibility was detected in an initial mapping cross on LG 14. In a second cross, we confirmed this susceptibility locus and fine mapped it to a 5 cM region that explains 82.6% of the total phenotypic variance. Conclusions We identify a major QTL that controls susceptibility to curvature. This locus contains over 100 genes, including MTNR1B, a candidate gene for human idiopathic scoliosis. The identification of genes associated with heritable spinal curvature in the curveback guppy has the potential to elucidate the biological basis of spinal curvature among humans and economically important teleosts.
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Affiliation(s)
- Kristen F Gorman
- Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada.
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Gorman KF, Handrigan GR, Jin G, Wallis R, Breden F. Structural and micro-anatomical changes in vertebrae associated with idiopathic-type spinal curvature in the curveback guppy model. SCOLIOSIS 2010; 5:10. [PMID: 20529276 PMCID: PMC2890417 DOI: 10.1186/1748-7161-5-10] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2010] [Accepted: 06/07/2010] [Indexed: 12/13/2022]
Abstract
BACKGROUND The curveback lineage of guppy is characterized by heritable idiopathic-type spinal curvature that develops during growth. Prior work has revealed several important developmental similarities to the human idiopathic scoliosis (IS) syndrome. In this study we investigate structural and histological aspects of the vertebrae that are associated with spinal curvature in the curveback guppy and test for sexual dimorphism that might explain a female bias for severe curve magnitudes in the population. METHODS Vertebrae were studied from whole-mount skeletal specimens of curved and non-curved adult males and females. A series of ratios were used to characterize structural aspects of each vertebra. A three-way analysis of variance tested for effects of sex, curvature, vertebral position along the spine, and all 2-way interactions (i.e., sex and curvature, sex and vertebra position, and vertebra position and curvature). Histological analyses were used to characterize micro-architectural changes in affected vertebrae and the intervertebral region. RESULTS In curveback, vertebrae that are associated with curvature demonstrate asymmetric shape distortion, migration of the intervertebral ligament, and vertebral thickening on the concave side of curvature. There is sexual dimorphism among curved individuals such that for several vertebrae, females have more slender vertebrae than do males. Also, in the region of the spine where lordosis typically occurs, curved and non-curved females have a reduced width at the middle of their vertebrae, relative to males. CONCLUSIONS Based on similarities to human spinal curvatures and to animals with induced curves, the concave-convex biases described in the guppy suggest that there is a mechanical component to curve pathogenesis in curveback. Because idiopathic-type curvature in curveback is primarily a sagittal deformity, it is structurally more similar to Scheuermann kyphosis than IS. Anatomical differences between teleosts and humans make direct biomechanical comparisons difficult. However, study of basic biological systems involved in idiopathic-type spinal curvature in curveback may provide insight into the relationship between a predisposing aetiology, growth, and biomechanics. Further work is needed to clarify whether observed sex differences in vertebral characteristics are related to the female bias for severe curves that is observed in the population.
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Affiliation(s)
- Kristen F Gorman
- Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Gregory R Handrigan
- Department of Oral Health Sciences, Faculty of Dentistry, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Ge Jin
- Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Rob Wallis
- Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Felix Breden
- Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
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Abstract
STUDY DESIGN A comparative allometric study of body lengths in an animal model for human idiopathic-type scoliosis. OBJECTIVE To compare body length variation among adult curved and noncurved curveback female guppies. SUMMARY OF BACKGROUND DATA Tallness and/or abnormal anthropometric parameters have been correlated to idiopathic-type scoliosis (IS) in numerous studies. Heritable curvature in curveback has demonstrated morphologic and developmental similarities to human IS. Because control of body length in the guppy is heritable and variable, we investigated whether length might also be correlated to curvature in the curveback population. METHODS Component body lengths were measured from digital photographs for 321 (246 curved and 75 noncurved) females. Sources of experimental variation were omitted by only measuring 2-dimensional curves in mature females all from the same pedigree, and raised under controlled conditions of diet and environment. Body length was divided into 2 component parts (precaudal and caudal). Body lengths were tested statistically for correlation to curvature and curve magnitude. RESULTS Although absolute length does not correlate to curvature, this survey of length in the curveback model reveals 2 important similarities to anthropometric studies of IS: that there are disproportionate body lengths among females with curvature, and the suggestion of an underlying growth abnormality among curved individuals. CONCLUSION In order to better characterize the relationship between growth, length disproportion, and curvature in the guppy, further studies are warranted. However, this inquiry further supports the usefulness of curveback as a model for understanding the basic biology of idiopathic-type scoliosis and encourages study of growth-related factors.
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Yang Z, Xie Y, Chen J, Zhang D, Yang C, Li M. High selenium may be a risk factor of adolescent idiopathic scoliosis. Med Hypotheses 2010; 75:126-7. [PMID: 20189316 DOI: 10.1016/j.mehy.2010.02.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Accepted: 02/03/2010] [Indexed: 11/17/2022]
Abstract
The pathogenesis of adolescent idiopathic scoliosis (AIS) remains little understood. Previous work has shown that guppy fish is an ideal animal model of idiopathic scoliosis which has similar epidemiological and morphological characteristic with AIS. However, some research speculated that the high-selenium environment could also induce idiopathic-type scoliosis of fish. We believe that the high-selenium related deformity of spine and guppy curveback syndrome may have the same pathogenesis. And high selenium may be a risk factor of AIS.
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Affiliation(s)
- Zongde Yang
- Scoliosis Research Center, Orthopedic Department, Changhai Hospital, Second Military Medical University, Shanghai 200433, China
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Critical early roles for col27a1a and col27a1b in zebrafish notochord morphogenesis, vertebral mineralization and post-embryonic axial growth. PLoS One 2009; 4:e8481. [PMID: 20041163 PMCID: PMC2794549 DOI: 10.1371/journal.pone.0008481] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2009] [Accepted: 11/24/2009] [Indexed: 01/27/2023] Open
Abstract
Background Fibrillar collagens are well known for their links to human diseases, with which all have been associated except for the two most recently identified fibrillar collagens, type XXIV collagen and type XXVII collagen. To assess functions and potential disease phenotypes of type XXVII collagen, we examined its roles in zebrafish embryonic and post-embryonic development. Methodology/Principal Findings We identified two type XXVII collagen genes in zebrafish, col27a1a and col27a1b. Both col27a1a and col27a1b were expressed in notochord and cartilage in the embryo and early larva. To determine sites of type XXVII collagen function, col27a1a and col27a1b were knocked down using morpholino antisense oligonucleotides. Knockdown of col27a1a singly or in conjunction with col27a1b resulted in curvature of the notochord at early stages and formation of scoliotic curves as well as dysmorphic vertebrae at later stages. These defects were accompanied by abnormal distributions of cells and protein localization in the notochord, as visualized by transmission electron microscopy, as well as delayed vertebral mineralization as detected histologically. Conclusions/Significance Together, our findings indicate a key role for type XXVII collagen in notochord morphogenesis and axial skeletogenesis and suggest a possible human disease phenotype.
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Gorman KF, Breden F. Idiopathic-type scoliosis is not exclusive to bipedalism. Med Hypotheses 2008; 72:348-52. [PMID: 19070438 DOI: 10.1016/j.mehy.2008.09.052] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2008] [Revised: 09/12/2008] [Accepted: 09/12/2008] [Indexed: 12/11/2022]
Abstract
Human familial/idiopathic-type scoliosis (IS) is a complex genetic disorder for which the cause is unknown. The curve phenotype characteristically demonstrates pronounced morphological and developmental variability that is likely a consequence of biomechanical, environmental, and genetic differences between individuals. In addition, risk factors that affect the propensity for curves to progress to severity are unknown. Progress in understanding the fundamental biology of idiopathic-type scoliosis has been limited by the lack of a genetic/developmental animal model. Prior to consideration of teleosts, developmental idiopathic-type scoliosis has been considered to be exclusive to humans. Consequently, there is the notion that the syndrome is a result of bipedalism, and many studies try to explain the deformity from this anthrocentric viewpoint. This perspective has been reinforced by the choice of animals used for study, in that chickens and bipedal rats and mice demonstrate idiopathic-type curvature when made melatonin-deficient, but quadrupedal animals do not. Overlooked is the fact that teleosts also demonstrate similar curvature when made melatonin-deficient. Our characterization of the guppy curveback has demonstrated that non-induced idiopathic-type curvature is not exclusive to humans, nor bipedalism. We hypothesize that unique morphological, developmental and genetic parallels between the human and guppy syndromes are due to common molecular pathways involved in the etiopathogenesis of both phenotypes. We explore established gene conservation between human and teleost genomes that are in pathways hypothesized to be involved in the IS syndrome. We present non-induced vertebral wedging as a unique shared feature in IS and curveback that suggests a similar interaction between a molecular phenotype on the level of the vertebral anatomy, and biomechanics. We propose that rather than bipedalism per se, expression of idiopathic-type scoliosis is dependent on normal spinal loading applied along the cranio-caudal axis that interacts with an unknown factor causing the primary curve. In this regard, a comparative biological approach using a simplified teleost model will promote discovery of basic processes integral to idiopathic-type scoliosis in teleosts and humans, and highlight human-specific aspects of the deformity.
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Affiliation(s)
- Kristen F Gorman
- Department of Biological Sciences, Simon Fraser University, 8888 University Dr, Burnaby, BC, Canada V5A 1S6.
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Neues F, Epple M. X-ray microcomputer tomography for the study of biomineralized endo- and exoskeletons of animals. Chem Rev 2008; 108:4734-41. [PMID: 18754688 DOI: 10.1021/cr078250m] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Frank Neues
- Inorganic Chemistry and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 45117 Essen, Germany
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Neues F, Goerlich R, Renn J, Beckmann F, Epple M. Skeletal deformations in medaka (Oryzias latipes) visualized by synchrotron radiation micro-computer tomography (SRmicroCT). J Struct Biol 2007; 160:236-40. [PMID: 17905598 DOI: 10.1016/j.jsb.2007.08.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2007] [Revised: 08/15/2007] [Accepted: 08/18/2007] [Indexed: 11/26/2022]
Abstract
Synchrotron radiation micro-computer tomography (SRmicroCT) offers the possibility to investigate biomineralized structures in high detail. Two animals of adult medaka fish (Oryzias latipes) were analyzed by SRmicroCT with a resolution of 6.55 microm: the wild-type animal was normally developed whereas the second animal showed an idiopathic deformation of the cranial and axial skeleton. These deformations could be followed on the macro- and on the microscale (i.e., on the level of the individual ribs and fin bones). Our study clearly demonstrates that SRmicroCT is an excellent technique to study alterations in the skeletal structure of fish in detail.
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Affiliation(s)
- Frank Neues
- Inorganic Chemistry, University of Duisburg-Essen, Universitaetsstrasse 5-7, 45117 Essen, Germany
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Recent Papers on Zebrafish and Other Aquarium Fish Models. Zebrafish 2007. [DOI: 10.1089/zeb.2007.9987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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