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Kokkorakis N, Douka K, Nalmpanti A, Politis PK, Zagoraiou L, Matsas R, Gaitanou M. Mirk/Dyrk1B controls ventral spinal cord development via Shh pathway. Cell Mol Life Sci 2024; 81:70. [PMID: 38294527 PMCID: PMC10830675 DOI: 10.1007/s00018-023-05097-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 12/14/2023] [Accepted: 12/17/2023] [Indexed: 02/01/2024]
Abstract
Cross-talk between Mirk/Dyrk1B kinase and Sonic hedgehog (Shh)/Gli pathway affects physiology and pathology. Here, we reveal a novel role for Dyrk1B in regulating ventral progenitor and neuron subtypes in the embryonic chick spinal cord (SC) via the Shh pathway. Using in ovo gain-and-loss-of-function approaches at E2, we report that Dyrk1B affects the proliferation and differentiation of neuronal progenitors at E4 and impacts on apoptosis specifically in the motor neuron (MN) domain. Especially, Dyrk1B overexpression decreases the numbers of ventral progenitors, MNs, and V2a interneurons, while the pharmacological inhibition of endogenous Dyrk1B kinase activity by AZ191 administration increases the numbers of ventral progenitors and MNs. Mechanistically, Dyrk1B overexpression suppresses Shh, Gli2 and Gli3 mRNA levels, while conversely, Shh, Gli2 and Gli3 transcription is increased in the presence of Dyrk1B inhibitor AZ191 or Smoothened agonist SAG. Most importantly, in phenotype rescue experiments, SAG restores the Dyrk1B-mediated dysregulation of ventral progenitors. Further at E6, Dyrk1B affects selectively the medial lateral motor neuron column (LMCm), consistent with the expression of Shh in this region. Collectively, these observations reveal a novel regulatory function of Dyrk1B kinase in suppressing the Shh/Gli pathway and thus affecting ventral subtypes in the developing spinal cord. These data render Dyrk1B a possible therapeutic target for motor neuron diseases.
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Affiliation(s)
- N Kokkorakis
- Laboratory of Cellular and Molecular Neurobiology-Stem Cells, Hellenic Pasteur Institute, Athens, Greece
- Division of Animal and Human Physiology, Department of Biology, National and Kapodistrian University of Athens, Athens, Greece
| | - K Douka
- Laboratory of Cellular and Molecular Neurobiology-Stem Cells, Hellenic Pasteur Institute, Athens, Greece
| | - A Nalmpanti
- Laboratory of Cellular and Molecular Neurobiology-Stem Cells, Hellenic Pasteur Institute, Athens, Greece
- Athens International Master's Programme in Neurosciences, Department of Biology, National and Kapodistrian University of Athens, Athens, Greece
| | - P K Politis
- Center of Basic Research, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
- School of Medicine, European University Cyprus, Nicosia, Cyprus
| | - L Zagoraiou
- School of Medicine, European University Cyprus, Nicosia, Cyprus
| | - R Matsas
- Laboratory of Cellular and Molecular Neurobiology-Stem Cells, Hellenic Pasteur Institute, Athens, Greece
| | - M Gaitanou
- Laboratory of Cellular and Molecular Neurobiology-Stem Cells, Hellenic Pasteur Institute, Athens, Greece.
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2
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Mohan M, Sabapathy SR. Clinical evidence of the association between radial longitudinal deficiency and radial polydactyly: a case series. J Hand Surg Eur Vol 2023; 48:1177-1183. [PMID: 37395418 DOI: 10.1177/17531934231185036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Radial longitudinal deficiency (RLD) is commonly associated with thumb hypoplasia. The association between RLD and radial polydactyly (RP) is uncommon, but case reports or case series have been reported. We report our experience of managing patients with this association. A total of 97 patients with RLD were seen in our department, of which six were children with concomitant RLD and RP. Four children had both RLD and RP in the same limb; of them, three also had RLD in the contralateral limb. The mean age at presentation was 11.6 months. Awareness of this association alerts the clinician to look for RLD in the presence of RP and vice versa. This case series supports recent experimental and clinical evidence that RP and RLD may be part of the same developmental spectrum. Further studies may guide its inclusion as a possible new category in the Oberg-Manske-Tonkin (OMT) classification of congenital upper-limb anomalies.Level of evidence: IV.
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Affiliation(s)
- Monusha Mohan
- Department of Plastic, Hand and Reconstructive Microsurgery, Ganga Hospital, Coimbatore, Tamil Nadu, India
| | - S Raja Sabapathy
- Department of Plastic, Hand and Reconstructive Microsurgery, Ganga Hospital, Coimbatore, Tamil Nadu, India
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3
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Wang S, Tanaka Y, Xu Y, Takeda S, Hirokawa N. KIF3B promotes a PI3K signaling gradient causing changes in a Shh protein gradient and suppressing polydactyly in mice. Dev Cell 2022; 57:2273-2289.e11. [DOI: 10.1016/j.devcel.2022.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Revised: 07/27/2022] [Accepted: 09/13/2022] [Indexed: 11/03/2022]
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4
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Preaxial Polydactyly in an Elderly Woman. Case Rep Orthop 2022; 2022:7031401. [PMID: 36092282 PMCID: PMC9453009 DOI: 10.1155/2022/7031401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 08/18/2022] [Indexed: 11/24/2022] Open
Abstract
A 70-year-old woman born and raised in India presented with Wassel type IV preaxial polydactyly of the right thumb and difficulty performing daily activities. She elected for surgical reconstruction after postponing the procedure for many years due to cultural norms. Her postoperative course was unremarkable. At her 3-month follow-up, she was diagnosed with carpal tunnel syndrome and underwent open carpal tunnel release. Preaxial polydactyly repair is unusual in patients older than 25 years. Though the duplication is considered lucky in South Asia, indications for this case were arthritic pain, cosmesis, and function. This case report details a unique indication for polydactyly reconstruction, arthritic pain, which may benefit hand surgeons when discussing the literature on adult polydactyly with their patients.
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5
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Fan L, Jin P, Qian Y, Shen G, Shen X, Dong M. Case Report: Prenatal Diagnosis of Postaxial Polydactyly With Bi-Allelic Variants in Smoothened (SMO). Front Genet 2022; 13:887082. [PMID: 35812756 PMCID: PMC9257524 DOI: 10.3389/fgene.2022.887082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 05/13/2022] [Indexed: 12/02/2022] Open
Abstract
Postaxial polydactyly is a common congenital malformation which involves complex genetic factors. This retrospective study analyzed the cytogenetic and molecular results of a Chinese fetus diagnosed with postaxial polydactyly of all four limbs. Fetal karyotyping and chromosomal microarray analysis (CMA) did not find any abnormality while trio whole-exome sequencing (trio-WES) identified bi-allelic variants in smoothened (SMO) and (NM_005631.5: c.1219C > G, NP_005622.1: p. Pro407Ala, and NM_005631.5: c.1619C > T, NP_005622.1: p. Ala540Val). Sanger sequencing validated these variants. The mutations are highly conserved across multiple species. In-depth bioinformatics analysis and familial co-segregation implied the compound heterozygous variants as the likely cause of postaxial polydactyly in this fetus. Our findings provided the basis for genetic counseling and will contribute to a better understanding of the complex genetic mechanism that underlies postaxial polydactyly.
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Affiliation(s)
- Lihong Fan
- Center of Prenatal Diagnosis, Huzhou Maternity & Child Health Care Hospital, Huzhou, China
| | - Pengzhen Jin
- Women’s Hospital, School of Medicine Zhejiang University, Hangzhou, China
| | - Yeqing Qian
- Women’s Hospital, School of Medicine Zhejiang University, Hangzhou, China
| | - Guosong Shen
- Center of Prenatal Diagnosis, Huzhou Maternity & Child Health Care Hospital, Huzhou, China
| | - Xueping Shen
- Center of Prenatal Diagnosis, Huzhou Maternity & Child Health Care Hospital, Huzhou, China
| | - Minyue Dong
- Women’s Hospital, School of Medicine Zhejiang University, Hangzhou, China
- Key Laboratory of Reproductive Genetics (Zhejiang University), Ministry of Education, Hangzhou, China
- *Correspondence: Minyue Dong,
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6
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Zeng L, Jin JY, Luo FM, Sheng Y, Wu PF, Xiang R. ZPA Regulatory Sequence Variants in Chinese Patients With Preaxial Polydactyly: Genetic and Clinical Characteristics. Front Pediatr 2022; 10:797978. [PMID: 35652055 PMCID: PMC9149355 DOI: 10.3389/fped.2022.797978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 03/29/2022] [Indexed: 11/29/2022] Open
Abstract
Preaxial polydactyly (PPD) is a common congenital abnormality with an incidence of 0.8-1.4% in Asians, characterized by the presence of extra digit(s) on the preaxial side of the hand or foot. PPD is genetically classified into four subtypes, PPD type I-IV. Variants in six genes/loci [including GLI family zinc finger 3 (GLI3), ZPA regulatory sequence (ZRS), and pre-ZRS region] have been identified in PPD cases. Among these loci, ZRS is, perhaps, the most special and well known, but most articles only reported one or a few cases. There is a lack of reports on the ZRS-variant frequency in patients with PPD. In this study, we recruited 167 sporadic or familial cases (including 154 sporadic patients and 13 families) with PPD from Central-South China and identified four ZRS variants in four patients (2.40%, 4/167), including two novel variants (ZRS131A > T/chr7:g.156584439A > T and ZRS474C > G/chr7:g.156584096C > G) and two known variants (ZRS428T > A/chr7:g.156584142T > A and ZRS619C > T/chr7:g.156583951C > T). ZRS131A > T and ZRS428T > A were detected in PPD I cases and ZRS474C > G and ZRS619C > T combinedly acted to cause PPD II. The detectable rate of ZRS variants in PPD I was 1.60% (2/125), while PPD II was significantly higher (9.52%, 2/21). Three bilateral PPD cases harbored ZRS variants (13.64%, 3/22), suggesting that bilateral PPD was more possibly caused by genetic etiologies. This study identified two novel ZRS variants, further confirmed the association between ZRS and PPD I and reported a rare PPD II case resulted from the compound heterozygote of ZRS. This investigation preliminarily evaluated a ZRS variants rate in patients with PPD and described the general picture of PPD in Central-South China.
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Affiliation(s)
- Lei Zeng
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, China
| | - Jie-Yuan Jin
- School of Life Sciences, Central South University, Changsha, China.,Hunan Key Laboratory of Animal Models for Human Diseases, School of Life Sciences, Central South University, Changsha, China
| | - Fang-Mei Luo
- School of Life Sciences, Central South University, Changsha, China.,Hunan Key Laboratory of Animal Models for Human Diseases, School of Life Sciences, Central South University, Changsha, China
| | - Yue Sheng
- School of Life Sciences, Central South University, Changsha, China
| | - Pan-Feng Wu
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, China
| | - Rong Xiang
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,School of Life Sciences, Central South University, Changsha, China.,Hunan Key Laboratory of Animal Models for Human Diseases, School of Life Sciences, Central South University, Changsha, China.,Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, China
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7
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Hussain I, Raza RZ, Ali S, Abrar M, Abbasi AA. Molecular signatures of selection on the human GLI3 associated central nervous system specific enhancers. Dev Genes Evol 2021; 231:21-32. [PMID: 33655411 DOI: 10.1007/s00427-021-00672-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 02/09/2021] [Indexed: 11/25/2022]
Abstract
The zinc finger-containing transcription factor Gli3 is a key mediator of Hedgehog (Hh) signaling pathway. In vertebrates, Gli3 has widespread expression pattern during early embryonic development. Along the anteroposterior axes of the central nervous system (CNS), dorsoventral neural pattern elaboration is achieved through Hh mediated spatio-temporal deployment of Gli3 transcripts. Previously, we and others uncovered a set of enhancers that mediate many of the known aspects of Gli3 expression during neurogenesis. However, the potential role of Gli3 associated enhancers in trait evolution has not yet received any significant attention. Here, we investigate the evolutionary patterns of Gli3 associated CNS-specific enhancers that have been reported so far. A subset of these enhancers has undergone an accelerated rate of molecular evolution in the human lineage in comparison to other primates/mammals. These fast-evolving enhancers have acquired human-specific changes in transcription factor binding sites (TFBSs). These human-unique changes within subset of Gli3 associated CNS-specific enhancers were further validated as single nucleotide polymorphisms through 1000 Genome Project Phase 3 data. This work not only infers the molecular evolutionary patterns of Gli3 associated enhancers but also provides clues for putative genetic basis of the population-specificity of gene expression regulation.
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Affiliation(s)
- Irfan Hussain
- National Center for Bioinformatics, Program of Comparative and Evolutionary Genomics, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan
| | - Rabail Zehra Raza
- Department of Biological Sciences, National University of Medical Sciences, The Mall, Rawalpindi, Pakistan
| | - Shahid Ali
- National Center for Bioinformatics, Program of Comparative and Evolutionary Genomics, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan
| | - Muhammad Abrar
- National Center for Bioinformatics, Program of Comparative and Evolutionary Genomics, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan
| | - Amir Ali Abbasi
- National Center for Bioinformatics, Program of Comparative and Evolutionary Genomics, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan.
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8
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Sylvian fissure development is linked to differential genetic expression in the pre-folded brain. Sci Rep 2020; 10:14489. [PMID: 32879369 PMCID: PMC7468287 DOI: 10.1038/s41598-020-71535-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 08/18/2020] [Indexed: 12/29/2022] Open
Abstract
The mechanisms by which the human cerebral cortex folds into its final form remain poorly understood. With most of the current models and evidence addressing secondary folds, we sought to focus on the global geometry of the mature brain by studying its most distinctive feature, the Sylvian fissure. A digital human fetal brain atlas was developed using previously obtained MRI imaging of 81 healthy fetuses between gestational ages 21 and 38 weeks. To account for the development of the Sylvian fissure, we compared the growth of the frontotemporal opercula over the insular cortex and compared the transcriptome of the developing cortices for both regions. Spatiotemporal mapping of the lateral hemispheric surface showed the highest rate of organized growth in regions bordering the Sylvian fissure of the frontal, parietal and temporal lobes. Volumetric changes were first observed in the posterior aspect of the fissure moving anteriorly to the frontal lobe and laterally in the direction of the temporal pole. The insular region, delineated by the limiting insular gyri, expanded to a much lesser degree. The gene expression profile, before folding begins in the maturing brain, was significantly different in the developing opercular cortex compared to the insula. The Sylvian fissure forms by the relative overgrowth of the frontal and temporal lobes over the insula, corresponding to domains of highly expressed transcription factors involved in neuroepithelial cell differentiation.
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9
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Bozal-Basterra L, Gonzalez-Santamarta M, Muratore V, Bermejo-Arteagabeitia A, Da Fonseca C, Barroso-Gomila O, Azkargorta M, Iloro I, Pampliega O, Andrade R, Martín-Martín N, Branon TC, Ting AY, Rodríguez JA, Carracedo A, Elortza F, Sutherland JD, Barrio R. LUZP1, a novel regulator of primary cilia and the actin cytoskeleton, is a contributing factor in Townes-Brocks Syndrome. eLife 2020; 9:e55957. [PMID: 32553112 PMCID: PMC7363444 DOI: 10.7554/elife.55957] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 06/18/2020] [Indexed: 12/20/2022] Open
Abstract
Primary cilia are sensory organelles crucial for cell signaling during development and organ homeostasis. Cilia arise from centrosomes and their formation and function is governed by numerous factors. Through our studies on Townes-Brocks Syndrome (TBS), a rare disease linked to abnormal cilia formation in human fibroblasts, we uncovered the leucine-zipper protein LUZP1 as an interactor of truncated SALL1, a dominantly-acting protein causing the disease. Using TurboID proximity labeling and pulldowns, we show that LUZP1 associates with factors linked to centrosome and actin filaments. Here, we show that LUZP1 is a cilia regulator. It localizes around the centrioles and to actin cytoskeleton. Loss of LUZP1 reduces F-actin levels, facilitates ciliogenesis and alters Sonic Hedgehog signaling, pointing to a key role in cytoskeleton-cilia interdependency. Truncated SALL1 increases the ubiquitin proteasome-mediated degradation of LUZP1. Together with other factors, alterations in LUZP1 may be contributing to TBS etiology.
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Affiliation(s)
- Laura Bozal-Basterra
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
| | - María Gonzalez-Santamarta
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
| | - Veronica Muratore
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
| | - Aitor Bermejo-Arteagabeitia
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
| | - Carolina Da Fonseca
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
| | - Orhi Barroso-Gomila
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
| | - Mikel Azkargorta
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
- CIBERehd, Instituto de Salud Carlos IIIMadridSpain
- ProteoRed-ISCIII, Instituto de Salud Carlos IIIMadridSpain
| | - Ibon Iloro
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
- CIBERehd, Instituto de Salud Carlos IIIMadridSpain
- ProteoRed-ISCIII, Instituto de Salud Carlos IIIMadridSpain
| | - Olatz Pampliega
- Department of Neurosciences, University of the Basque Country, Achucarro Basque Center for Neuroscience-UPV/EHULeioaSpain
| | - Ricardo Andrade
- Analytical & High Resolution Biomedical Microscopy Core Facility, University of the Basque Country (UPV/EHU)LeioaSpain
| | - Natalia Martín-Martín
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
| | - Tess C Branon
- Department of Chemistry, Massachusetts Institute of TechnologyCambridgeUnited States
- Departments of Genetics, Chemistry and Biology, Stanford UniversityStanfordUnited States
| | - Alice Y Ting
- Department of Chemistry, Massachusetts Institute of TechnologyCambridgeUnited States
- Departments of Genetics, Chemistry and Biology, Stanford UniversityStanfordUnited States
- Chan Zuckerberg BiohubSan FranciscoUnited States
| | - Jose A Rodríguez
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country (UPV/EHU)LeioaSpain
| | - Arkaitz Carracedo
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
- CIBERONC, Instituto de Salud Carlos IIIMadridSpain
- Ikerbasque, Basque Foundation for ScienceBilbaoSpain
- Biochemistry and Molecular Biology Department, University of the Basque Country (UPV/EHU)BilbaoSpain
| | - Felix Elortza
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
- CIBERehd, Instituto de Salud Carlos IIIMadridSpain
- ProteoRed-ISCIII, Instituto de Salud Carlos IIIMadridSpain
| | - James D Sutherland
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
| | - Rosa Barrio
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology ParkDerioSpain
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10
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Amano T. Gene regulatory landscape of the sonic hedgehog locus in embryonic development. Dev Growth Differ 2020; 62:334-342. [PMID: 32343848 DOI: 10.1111/dgd.12668] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 03/31/2020] [Accepted: 04/15/2020] [Indexed: 12/22/2022]
Abstract
The organs of vertebrate species display a wide variety of morphology. A remaining challenge in evolutionary developmental biology is to elucidate how vertebrate lineages acquire distinct morphological features. Developmental programs are driven by spatiotemporal regulation of gene expression controlled by hundreds of thousands of cis-regulatory elements. Changes in the regulatory elements caused by the introduction of genetic variants can confer regulatory innovation that may underlie morphological novelties. Recent advances in sequencing technology have revealed a number of potential regulatory variants that can alter gene expression patterns. However, a limited number of studies demonstrate causal dependence between genetic and morphological changes. Regulation of Shh expression is a good model to understand how multiple regulatory elements organize tissue-specific gene expression patterns. This model also provides insights into how evolution of molecular traits, such as gene regulatory networks, lead to phenotypic novelty.
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Affiliation(s)
- Takanori Amano
- Next Generation Human Disease Model Team, RIKEN BioResource Research Center, Tsukuba, Japan
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11
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Habenicht R, Mann M, Guéro S, Ezaki M, Oberg KC. Distal Dorsal Dimelia: A Disturbance of Dorsal-Ventral Digit Development. J Hand Surg Am 2019; 44:421.e1-421.e8. [PMID: 30292712 DOI: 10.1016/j.jhsa.2018.07.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 05/24/2018] [Accepted: 07/13/2018] [Indexed: 02/02/2023]
Abstract
PURPOSE Congenital palmar nail (distal dorsal dimelia [dDD]) of the hand is a rare malformation most commonly affecting the little finger. The purpose of this report was to review the features and associations of this rare disorder and discuss the suspected underlying etiology in light of our current understanding of developmental biology. METHODS In this retrospective cohort study from 3 practices, we describe our collective experience and review the reported literature on this disorder both as an isolated condition and in conjunction with other anomalies. RESULTS We examined 15 fingers with dDD, 5 of which involved little fingers. We also found dDD in 6 cases with radial polydactyly (preaxial polydactyl type II [PPD2]) and in 1 case of cleft hand involving digits adjacent to the clefted web space (the index and middle fingers). Cases of little finger dDD were also associated with prominent clefting of the adjacent web space in 4 of 5 cases. All cases had stiffness of the interphalangeal joints and loss of palmar creases consistent with dorsalization of the palmar aspect of the digit. When combined with 63 fingers reported in the literature with dDD, 3 patterns were evident. The most common form occurred in little fingers (n = 50; 64%; dDDu). The next most common form was reported in association with cleft hands (n = 16; 21%; dDDc). Radial digits in association with either radial polydactyly (PPD2) or radial longitudinal deficiency were also susceptible to dDD (n = 12; 15%; dDDr). CONCLUSIONS Congenital dDD is a disturbance of terminal dorsal-ventral digit patterning. The distribution of this condition with little fingers, clefting, and altered radial digit formation (PPD2 or radial longitudinal deficiency), as well as recent genetic and animal studies, suggests that dDD and altered dorsal-ventral patterning are linked to abnormal apical ectodermal ridge boundary formation. TYPE OF STUDY/LEVEL OF EVIDENCE Diagnostic IV.
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Affiliation(s)
- Rolf Habenicht
- Department of Hand Surgery, Catholic Children's Hospital Wilhelmstift, Hamburg, Germany
| | - Max Mann
- Department of Hand Surgery, Catholic Children's Hospital Wilhelmstift, Hamburg, Germany
| | | | - Marybeth Ezaki
- Department of Orthopedics, Texas Scottish Rite Hospital for Children, Dallas, TX
| | - Kerby C Oberg
- Department of Pathology and Human Anatomy, Loma Linda University, Loma Linda, CA.
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12
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Lam WL, Oh JDH, Johnson EJ, Pertinez SP, Stephens C, Davey MG. Experimental evidence that preaxial polydactyly and forearm radial deficiencies may share a common developmental origin. J Hand Surg Eur Vol 2019; 44:43-50. [PMID: 29587601 DOI: 10.1177/1753193418762959] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Preaxial polydactyly is a congenital hand anomaly predominantly of sporadic occurrence, which is frequently associated with abnormalities of the Sonic hedgehog signalling pathway. In experimentally induced preaxial polydactyly, radial aplasia is also frequently observed. To determine if there is a correlation between preaxial polydactyly and radial aplasia, we induced ectopic Sonic hedgehog signalling during chicken limb development with application of a smoothened-agonist (SAG) or retinoic acid. Application of SAG caused malformations in 71% limbs including preaxial polydactyly (62%) and forearm abnormalities (43%). Retinoic acid application induced malformations in 56% of limb including preaxial polydactyly (45%) and forearm abnormalities (50%). Radial dysplasia and ulnar dimelia were observed in both experimental conditions. We demonstrate that ectopic Sonic hedgehog signalling may cause both preaxial polydactyly and predictable forearm anomalies and that these conditions could potentially be classified as one embryological group. We propose a unifying model based on known models of ectopic Sonic hedgehog signalling.
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Affiliation(s)
- Wee L Lam
- 1 Royal Hospital for Sick Children, Edinburgh, UK
| | - Julia D H Oh
- 1 Royal Hospital for Sick Children, Edinburgh, UK.,2 Division of Developmental Biology, University of Edinburgh, Edinburgh, UK. In collaboration with Roslin Institute Chicken Embryology (RICE)
| | - Edward J Johnson
- 2 Division of Developmental Biology, University of Edinburgh, Edinburgh, UK. In collaboration with Roslin Institute Chicken Embryology (RICE)
| | - Sandra Poyatos Pertinez
- 2 Division of Developmental Biology, University of Edinburgh, Edinburgh, UK. In collaboration with Roslin Institute Chicken Embryology (RICE)
| | - Chloe Stephens
- 2 Division of Developmental Biology, University of Edinburgh, Edinburgh, UK. In collaboration with Roslin Institute Chicken Embryology (RICE)
| | - Megan G Davey
- 2 Division of Developmental Biology, University of Edinburgh, Edinburgh, UK. In collaboration with Roslin Institute Chicken Embryology (RICE)
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13
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Fish EW, Parnell SE, Sulik KK, Baker LK, Murdaugh LB, Lamson D, Williams KP. Preaxial polydactyly following early gestational exposure to the smoothened agonist, SAG, in C57BL/6J mice. Birth Defects Res 2018; 109:49-54. [PMID: 27801979 DOI: 10.1002/bdra.23571] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 08/01/2016] [Accepted: 08/29/2016] [Indexed: 01/13/2023]
Abstract
BACKGROUND While pharmacological activation of the Hedgehog (HH) signaling pathway may have therapeutic benefits for developmental and adult diseases, its teratogenic potential is of concern. The membrane molecule Smoothened (SMO) transduces HH signaling and can be acutely modulated by antagonists and agonists. The objective of the current experiments was to determine how maternal treatment with the Smo agonist, SAG, affects the developing limb. METHODS Pregnant C57BL/6J mice received a single injection of SAG (15, 17, or 20 mg/kg, i.p.) or its vehicle on gestational day (GD) 9.25, the time of limb bud induction. Embryos were examined on GD 15 for gross dysmorphology and skeletal staining was performed to visualize the number and type of digits on the fore- and hindlimbs. Additionally, in situ hybridization was performed 4 hr after GD 9.25 SAG administration to determine SAG's effects on Gli1 and Gli2 mRNA expression. RESULTS The most prevalent effect of SAG was the dose-dependent induction of pre-axial polydactyly; defects ranged from a broad thumb to the duplication of two finger-like digits on the preaxial side of the thumb. The highest SAG dose was effective in ca. 80% of the embryos and increased Gli1 and Gli2 mRNA expression in the limb bud, with Gli1 mRNA being the most upregulated. CONCLUSION Preaxial polydactyly can be caused in the developing embryo by acute maternal administration of a Smo agonist that activates HH signaling. These results are consistent with the preaxial polydactyly induced in developmental disorders associated with mutations in HH signaling genes.Birth Defects Research 109:49-54, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Eric W Fish
- Bowles Center for Alcohol Studies, University of North Carolina, Chapel Hill, North Carolina
| | - Scott E Parnell
- Bowles Center for Alcohol Studies, University of North Carolina, Chapel Hill, North Carolina.,Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, North Carolina.,Carolina Institute for Developmental Disabilities, University of North Carolina, Chapel Hill, North Carolina
| | - Kathleen K Sulik
- Bowles Center for Alcohol Studies, University of North Carolina, Chapel Hill, North Carolina.,Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, North Carolina.,Carolina Institute for Developmental Disabilities, University of North Carolina, Chapel Hill, North Carolina
| | - Lorinda K Baker
- Bowles Center for Alcohol Studies, University of North Carolina, Chapel Hill, North Carolina
| | - Laura B Murdaugh
- Bowles Center for Alcohol Studies, University of North Carolina, Chapel Hill, North Carolina
| | - David Lamson
- Department of Pharmaceutical Sciences, BRITE Institute, North Carolina Central University, Durham, North Carolina
| | - Kevin P Williams
- Department of Pharmaceutical Sciences, BRITE Institute, North Carolina Central University, Durham, North Carolina
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14
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Zhang Z, Yi D, Xie R, Hamilton JL, Kang QL, Chen D. Postaxial limb hypoplasia (PALH): the classification, clinical features, and related developmental biology. Ann N Y Acad Sci 2017; 1409:67-78. [PMID: 28990185 PMCID: PMC5730483 DOI: 10.1111/nyas.13440] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 06/18/2017] [Accepted: 06/28/2017] [Indexed: 12/29/2022]
Abstract
Postaxial limb hypoplasia (PALH) is a group of nonhereditary diseases with congenital lower limb deficiency affecting the fibular ray, including fibular hemimelia, proximal femoral focal deficiency, and tarsal coalition. The etiology and the developmental biology of the anomaly are still not fully understood. Here, we review the previous classification systems, present the clinical features, and discuss the developmental biology of PALH.
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Affiliation(s)
- Zeng Zhang
- Department of Orthopedic Surgery, Shanghai Jiao-Tong University Affiliated the Sixth People’s Hospital, Shanghai, China
| | - Dan Yi
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois
| | - Rong Xie
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois
| | - John L. Hamilton
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois
| | - Qing-Lin Kang
- Department of Orthopedic Surgery, Shanghai Jiao-Tong University Affiliated the Sixth People’s Hospital, Shanghai, China
| | - Di Chen
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois
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15
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Chu Q, Yan Z, Zhang J, Usman T, Zhang Y, Liu H, Wang H, Geng A, Liu H. Association of SNP rs80659072 in the ZRS with polydactyly in Beijing You chickens. PLoS One 2017; 12:e0185953. [PMID: 29016641 PMCID: PMC5633194 DOI: 10.1371/journal.pone.0185953] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Accepted: 09/24/2017] [Indexed: 12/16/2022] Open
Abstract
The Beijing You chicken is a Chinese native breed with superior meat quality and a unique appearance. The G/T mutation of SNP rs80659072 in the Shh long-range regulator of GGA2 is highly associated with the polydactyly phenotype in some chicken breeds. In the present study, this SNP was genotyped using the TaqMan detection method, and its association with the number of toes was analyzed in a flock of 158 birds of the Beijing You population maintained at the Beijing Academy of Agriculture and Forestry Sciences. Furthermore, the skeletal structure of the digits was dissected and assembled in 113 birds. The findings revealed that the toes of Beijing You chickens were rich and more complex than expected. The plausible mutation rs80659072 in the zone of polarizing activity regulatory sequence (ZRS) in chickens was an essential but not sufficient condition for polydactyly and polyphalangy in Beijing You chickens. Several individuals shared the T allele but showed normal four-digit conformations. However, breeding trials demonstrated that the T allele could serve as a strong genetic marker for five-toe selection in Beijing You chickens.
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Affiliation(s)
- Qin Chu
- Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, P. R. China
| | - Zhixun Yan
- Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, P. R. China
| | - Jian Zhang
- Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, P. R. China
| | - Tahir Usman
- College of Veterinary Science and Animal Husbandry, Garden Campus, Abdul Wali Khan University Mardan, Mardan, Pakistan
| | - Yao Zhang
- Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, P. R. China
| | - Hui Liu
- Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, P. R. China
| | - Haihong Wang
- Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, P. R. China
| | - Ailian Geng
- Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, P. R. China
| | - Huagui Liu
- Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, P. R. China
- * E-mail:
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16
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Abstract
An enhancer named MFCS1 regulates Sonic hedgehog (Shh) expression in the posterior mesenchyme of limb buds. Several mutations in MFCS1 induce ectopic Shh expression in the anterior limb bud, and these result in preaxial polydactyly (PPD). However, the molecular basis of ectopic Shh expression remains elusive, although some mutations are known to disrupt the negative regulation of Shh expression in the anterior limb bud. Here, we analyzed the molecular mechanism of ectopic Shh expression in PPD including in a mouse mutation-hemimelic extra toes (Hx)-and in other MFCS1 mutations in different species. First, we generated transgenic mouse lines with a LacZ reporter cassette flanked with tandem repeats of 40 bp MFCS1 fragments harboring a mutation. The transgenic mouse line with the Hx-type fragment showed reporter expression exclusively in the anterior, but not in the posterior margins of limb buds. In contrast, no specific LacZ expression was observed in lines carrying the MFCS1 fragment with other mutations. Yeast one-hybrid assays revealed that the msh-like homeodomain protein, MSX1, bound specifically to the Hx sequence of MFCS1. Thus, PPD caused by mutations in MFCS1 has two major types of molecular etiology: loss of a cis-motif for negative regulation of Shh, and acquisition of a new cis-motif binding to a preexisting transcription factor, as represented by the Hx mutation.
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17
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Matsubara H, Saito D, Abe G, Yokoyama H, Suzuki T, Tamura K. Upstream regulation for initiation of restricted Shh expression in the chick limb bud. Dev Dyn 2017; 246:417-430. [PMID: 28205287 DOI: 10.1002/dvdy.24493] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 02/06/2017] [Accepted: 02/10/2017] [Indexed: 11/07/2022] Open
Abstract
BACKGROUND The organizing center, which serves as a morphogen source, has crucial functions in morphogenesis in animal development. The center is necessarily located in a certain restricted area in the morphogenetic field, and there are several ways in which an organizing center can be restricted. The organizing center for limb morphogenesis, the ZPA (zone of polarizing activity), specifically expresses the Shh gene and is restricted to the posterior region of the developing limb bud. RESULTS The pre-pattern along the limb anteroposterior axis, provided by anterior Gli3 expression and posterior Hand2 expression, seems insufficient for the initiation of Shh expression restricted to a narrow, small spot in the posterior limb field. Comparison of the spatiotemporal patterns of gene expression between Shh and some candidate genes (Fgf8, Hoxd10, Hoxd11, Tbx2, and Alx4) upstream of Shh expression suggested that a combination of these genes' expression provides the restricted initiation of Shh expression. CONCLUSIONS Taken together with results of functional assays, we propose a model in which positive and negative transcriptional regulatory networks accumulate their functions in the intersection area of their expression regions to provide a restricted spot for the ZPA, the source of morphogen, Shh. Developmental Dynamics 246:417-430, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Haruka Matsubara
- Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Aobayama Aoba-ku, Sendai, 980-8578, Japan
| | - Daisuke Saito
- Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Aobayama Aoba-ku, Sendai, 980-8578, Japan.,Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Aobayama Aoba-ku, Sendai, 980-8578, Japan
| | - Gembu Abe
- Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Aobayama Aoba-ku, Sendai, 980-8578, Japan
| | - Hitoshi Yokoyama
- Department of Biochemistry and Molecular Biology, Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki, 036-8561, Japan
| | - Takayuki Suzuki
- Division of Biological Science, Graduate School of Science, Nagoya University, Furo-Cho, Chikusa-ku, Nagoya, 464-8602, Japan
| | - Koji Tamura
- Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Aobayama Aoba-ku, Sendai, 980-8578, Japan
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18
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Leal F, Cohn M. Loss and Re-emergence of Legs in Snakes by Modular Evolution of Sonic hedgehog and HOXD Enhancers. Curr Biol 2016; 26:2966-2973. [DOI: 10.1016/j.cub.2016.09.020] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 08/29/2016] [Accepted: 09/12/2016] [Indexed: 01/19/2023]
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19
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Ramsbottom SA, Pownall ME, Roelink H, Conway SJ. Regulation of Hedgehog Signalling Inside and Outside the Cell. J Dev Biol 2016; 4:23. [PMID: 27547735 PMCID: PMC4990124 DOI: 10.3390/jdb4030023] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The hedgehog (Hh) signalling pathway is conserved throughout metazoans and plays an important regulatory role in both embryonic development and adult homeostasis. Many levels of regulation exist that control the release, reception, and interpretation of the hedgehog signal. The fatty nature of the Shh ligand means that it tends to associate tightly with the cell membrane, and yet it is known to act as a morphogen that diffuses to elicit pattern formation. Heparan sulfate proteoglycans (HSPGs) play a major role in the regulation of Hh distribution outside the cell. Inside the cell, the primary cilium provides an important hub for processing the Hh signal in vertebrates. This review will summarise the current understanding of how the Hh pathway is regulated from ligand production, release, and diffusion, through to signal reception and intracellular transduction.
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Affiliation(s)
- Simon A. Ramsbottom
- Institute of Genetic Medicine, International Centre for Life, Newcastle University, NE1 3BZ Newcastle upon Tyne, UK
- Correspondence: ; Tel.: +44-(0)191-241-8612
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20
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Zhang Z, Nie C, Jia Y, Jiang R, Xia H, Lv X, Chen Y, Li J, Li X, Ning Z, Xu G, Chen J, Yang N, Qu L. Parallel Evolution of Polydactyly Traits in Chinese and European Chickens. PLoS One 2016; 11:e0149010. [PMID: 26859147 PMCID: PMC4747547 DOI: 10.1371/journal.pone.0149010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Accepted: 01/26/2016] [Indexed: 12/26/2022] Open
Abstract
Polydactyly is one of the most common hereditary congenital limb malformations in chickens and other vertebrates. The zone of polarizing activity regulatory sequence (ZRS) is critical for the development of polydactyly. The causative mutation of polydactyly in the Silkie chicken has been mapped to the ZRS; however, the causative mutations of other chicken breeds are yet to be established. To understand whether the same mutation decides the polydactyly phenotype in other chicken breeds, we detected the single-nucleotide polymorphism in 26 different chicken breeds, specifically, 24 Chinese indigenous breeds and 2 European breeds. The mutation was found to have fully penetrated chickens with polydactyly in China, indicating that it is causative for polydactyly in Chinese indigenous chickens. In comparison, the mutation showed no association with polydactyly in Houdan chickens, which originate from France, Europe. Based on the different morphology of polydactyly in Chinese and European breeds, we assumed that the trait might be attributable to different genetic foundations. Therefore, we subsequently performed genome-wide association analysis (GWAS) to locate the region associated with polydactyly. As a result, a ~0.39 Mb genomic region on GGA2p was identified. The region contains six candidate genes, with the causative mutation found in Chinese indigenous breeds also being located in this region. Our results demonstrate that polydactyly in chickens from China and Europe is caused by two independent mutation events that are closely located in the chicken genome.
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Affiliation(s)
- Zebin Zhang
- Department of Animal Genetics and Breeding, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Changsheng Nie
- Department of Animal Genetics and Breeding, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Yaxiong Jia
- Beijing Municipal General Station of Animal Science, Beijing, 100107, China
| | - Runshen Jiang
- College of Animal Science and Technology, Anhui Agricultural University, Hefei, 230036, China
| | - Haijian Xia
- Department of Animal Genetics and Breeding, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Xueze Lv
- Beijing Municipal General Station of Animal Science, Beijing, 100107, China
| | - Yu Chen
- Beijing Municipal General Station of Animal Science, Beijing, 100107, China
| | - Junying Li
- Department of Animal Genetics and Breeding, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Xianyao Li
- College of Animal Science, Shandong Agricultural University, Taian, 271018, China
| | - Zhonghua Ning
- Department of Animal Genetics and Breeding, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Guiyun Xu
- Department of Animal Genetics and Breeding, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Jilan Chen
- Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Ning Yang
- Department of Animal Genetics and Breeding, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Lujiang Qu
- Department of Animal Genetics and Breeding, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
- * E-mail:
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21
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Ibisler A, Hehr U, Barth A, Koch M, Epplen JT, Hoffjan S. Novel KIF7 Mutation in a Tunisian Boy with Acrocallosal Syndrome: Case Report and Review of the Literature. Mol Syndromol 2015; 6:173-80. [PMID: 26648833 DOI: 10.1159/000439414] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/23/2015] [Indexed: 12/14/2022] Open
Abstract
Acrocallosal syndrome (ACLS) is a rare autosomal recessive disorder characterized by agenesis of the corpus callosum, facial dysmorphism, postaxial polydactyly of the hands as well as preaxial polydactyly of the feet, and developmental delay. Mutations in the KIF7 gene, encoding a molecule within the Sonic hedgehog (SHH) pathway, have been identified as causative for ACLS but also for the fatal hydrolethalus syndrome and some cases of Joubert syndrome. We report here on a Tunisian boy who shows the clinical characteristics of ACLS and was found to have a novel homozygous KIF7 nonsense mutation. Further, we summarize the current knowledge about the clinical spectrum associated with KIF7 mutations as well as genetic and/or phenotypic overlap with ciliopathies and other mutations in the SHH pathway.
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Affiliation(s)
- Aysegül Ibisler
- Department of Human Genetics, Ruhr University, Bochum, Germany
| | - Ute Hehr
- Center for and Department of Human Genetics, University of Regensburg, Regensburg, Germany
| | - Andre Barth
- Children's Hospital Datteln, University Witten/Herdecke, Datteln, Germany
| | - Margarete Koch
- Children's Hospital Datteln, University Witten/Herdecke, Datteln, Germany
| | - Jörg T Epplen
- Department of Human Genetics, Ruhr University, Bochum, Germany
| | - Sabine Hoffjan
- Department of Human Genetics, Ruhr University, Bochum, Germany
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