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Barrientos NB, Shoppell EA, Boyd RJ, Culotta VC, McCallion AS. Optimized CRISPR inhibition and activation opens key avenues for systematic biological exploration in zebrafish. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.09.16.613289. [PMID: 39345571 PMCID: PMC11430107 DOI: 10.1101/2024.09.16.613289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/01/2024]
Abstract
The application of CRISPR interference (CRISPRi) and CRISPR activation (CRISPRa) technologies in zebrafish has the potential to expand its capacity for the study of gene function significantly. We have developed a codon optimized CRISPRi/a for zebrafish; here we provide proof-of-principle data across established pigmentary and growth phenotypes. We established a zebrafish codon-optimized cas9 gene, harboring mutations D10A and D839A to render the protein catalytically inactive ( dCas9 ). Similarly, codon-optimized Krüppel associated box (KRAB) and methylated CP2 (MeCP2) inactivating domains or VP64 activator domain were cloned downstream from dCas9 for CRISPRi and CRISPRa, respectively. To validate CRISPRi, we targeted key genes in melanocyte differentiation ( sox10, mitfa, and mitfb) ; and melanin production (tyrosinase; tyr ). Microinjection of CRISPRi mRNA and single guide RNAs (sgRNAs) targeting the tyr promoter or 5'-UTR resulted in larvae with hypopigmented epidermal melanocytes. Transcription factors mitfa and mitfb similarly direct differentiation and pigmentation of epidermal melanocytes ( mitfa ) and retinal pigment epithelium (RPE, mitfb ). CRISPRi-mediated targeting of their promoters or 5'-UTR also results in pronounced hypopigmentation of epidermal melanocytes ( mitfa ), and RPE ( mitfb ). So too, targeting CRISPRi to the sox10 promoter results in hypopigmentation of both epidermal melanocytes and RPE consistent with its role upstream of mitfa and mitfb , and tyr . Finally, we asked whether CRISPRi and CRISPRa could be used to modulate a single gene, to yield hypomorphic and hypermorphic effects, selecting mrap2a , as our target. This gene regulates energy homeostasis and somatic growth via inhibition of the melanocortin 4 receptor gene ( mc4r ). We demonstrate that targeting the mrap2a 5'-UTR with CRISPRa or CRISPRi significantly increases or decreases larval body length, respectively. We demonstrate the utility of CRISPRi/a for modulating control of zebrafish gene expression, facilitating efficient assay of candidate gene function and disease relevance.
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Kanai SM, Clouthier DE. Endothelin signaling in development. Development 2023; 150:dev201786. [PMID: 38078652 PMCID: PMC10753589 DOI: 10.1242/dev.201786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
Since the discovery of endothelin 1 (EDN1) in 1988, the role of endothelin ligands and their receptors in the regulation of blood pressure in normal and disease states has been extensively studied. However, endothelin signaling also plays crucial roles in the development of neural crest cell-derived tissues. Mechanisms of endothelin action during neural crest cell maturation have been deciphered using a variety of in vivo and in vitro approaches, with these studies elucidating the basis of human syndromes involving developmental differences resulting from altered endothelin signaling. In this Review, we describe the endothelin pathway and its functions during the development of neural crest-derived tissues. We also summarize how dysregulated endothelin signaling causes developmental differences and how this knowledge may lead to potential treatments for individuals with gene variants in the endothelin pathway.
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Affiliation(s)
- Stanley M. Kanai
- Department of Craniofacial Biology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - David E. Clouthier
- Department of Craniofacial Biology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
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3
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Starr AL, Gokhman D, Fraser HB. Accounting for cis-regulatory constraint prioritizes genes likely to affect species-specific traits. Genome Biol 2023; 24:11. [PMID: 36658652 PMCID: PMC9850818 DOI: 10.1186/s13059-023-02846-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 01/04/2023] [Indexed: 01/20/2023] Open
Abstract
Measuring allele-specific expression in interspecies hybrids is a powerful way to detect cis-regulatory changes underlying adaptation. However, it remains difficult to identify genes most likely to explain species-specific traits. Here, we outline a simple strategy that leverages population-scale allele-specific RNA-seq data to identify genes that show constrained cis-regulation within species yet show divergence between species. Applying this strategy to data from human-chimpanzee hybrid cortical organoids, we identify signatures of lineage-specific selection on genes related to saccharide metabolism, neurodegeneration, and primary cilia. We also highlight cis-regulatory divergence in CUX1 and EDNRB that may shape the trajectory of human brain development.
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Affiliation(s)
| | - David Gokhman
- Department of Biology, Stanford University, Stanford, CA, USA
- Present Address: Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Hunter B Fraser
- Department of Biology, Stanford University, Stanford, CA, USA.
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Sahut-Barnola I, Lefrancois-Martinez AM, Dufour D, Jean-Marie BOTTO, Kamilaris C, Faucz FR, Stratakis CA, Val P, Martinez A. Steroidogenic factor-1 lineage origin of skin lesions in Carney complex syndrome. J Invest Dermatol 2022; 142:2949-2957.e9. [PMID: 35568059 DOI: 10.1016/j.jid.2022.04.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 03/28/2022] [Accepted: 04/16/2022] [Indexed: 02/02/2023]
Abstract
Carney complex (CNC) is a rare familial multi-neoplastic syndrome predisposing to endocrine and non-endocrine tumors due to inactivating mutations of PRKAR1A leading to perturbations of the cAMP protein kinase A (PKA) signaling pathway. Skin lesions are the most common manifestation of CNC, including lentigines, blue nevi and cutaneous myxomas, in unusual locations such as oral and genital mucosa. Unlike endocrine disorders, the pathogenesis of skin lesions remains unexplained. Here, we show that embryonic invalidation of the Prkar1a gene in Steroidogenic Factor-1-expressing cells, leads to the development of familial skin pigmentation alterations reminiscent of those in patients. Immunohistological and molecular analyses coupled with genetic monitoring of recombinant cell lineages in mouse skin, suggest that familial lentiginosis and myxomas occurs in skin areas specifically enriched in dermal melanocytes. In lentigines and blue nevi-prone areas from mutant mice and patients, Prkar1a/PRKAR1A invalidation occurs in a subset of dermal fibroblasts capable of inducing, under the influence of PKA signaling, the production of pro-melanogenic EDN3 and HGF signals. Our model strongly suggests that the origin of the typical CNC cutaneous lesions is the result of non-cell-autonomous pro-melanogenic activity of a dermal fibroblast population sharing a community of origin with SF-1 lineage.
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Affiliation(s)
| | | | - Damien Dufour
- iGReD, CNRS, Inserm, Université Clermont-Auvergne, France
| | | | | | | | | | - Pierre Val
- iGReD, CNRS, Inserm, Université Clermont-Auvergne, France
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5
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Kulikova IV. Molecular Mechanisms and Gene Regulation of Melanic Plumage Coloration in Birds. RUSS J GENET+ 2021. [DOI: 10.1134/s102279542108007x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Kriangwanich W, Piboon P, Sakorn W, Buddhachat K, Kochagul V, Pringproa K, Mekchay S, Nganvongpanit K. Consistency of dark skeletal muscles in Thai native black-bone chickens ( Gallus gallus domesticus). PeerJ 2021; 9:e10728. [PMID: 33520473 PMCID: PMC7811297 DOI: 10.7717/peerj.10728] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 12/17/2020] [Indexed: 11/20/2022] Open
Abstract
Black-bone chickens (Gallus gallus domesticus) have become economically valuable, particularly in Southeast Asia as a consequence of popular traditional Chinese medical practices. Chickens with whole body organ darkness are considered to have higher value and are, therefore, more often requested. This research study aimed to investigate the darkness in 34 skeletal muscles of 10 Thai black-bone chickens (five males and five females). The evaluation of muscle darkness was done on two levels: (i) a color chart was employed at the macroanatomical level and (ii) by using melanin pigment to evaluate the structure at the microanatomy level. The results revealed that the accumulation of melanin pigment in the muscle tissue was observed in the endomysium, perimysium and epimysium. With respect to the results of the color chart test, iliotibialis lateralis pars preacetabularis, gastrocnemius, fibularis longus and puboischiofemoralis pars medialis showed the highest degree of darkness, while serratus profundus, pectoralis, iliotibialis cranialis, flexor cruris lateralis, and flexor cruris medialis appeared to be the least dark. In addition, we found that the highest and lowest amounts of melanin pigment was noted in the flexor carpi ulnaris and pectoralis (p < 0.05), respectively; however, there was no significant difference (p > 0.05) observed between the sexes. These results reveal that the 34 specified muscles of black-bone chickens showed uneven distribution of darkness due to the differing accumulations of melanin pigments of each muscle.This information may provide background knowledge for a better understanding of melanin accumulation and lead to breeding improvements in Thai black-bone chickens.
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Affiliation(s)
- Wannapimol Kriangwanich
- Department of Veterinary Biosciences and Public Health, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai, Thailand
| | - Promporn Piboon
- Department of Veterinary Biosciences and Public Health, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai, Thailand
| | - Wirakorn Sakorn
- Department of Veterinary Biosciences and Public Health, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai, Thailand
| | - Kittisak Buddhachat
- Department of Biology, Faculty of Science, Naresuan University, Phitsanulok, Thailand.,Excellence Center in Veterinary Bioscience, Chiang Mai University, Chiang Mai, Thailand
| | - Varankpicha Kochagul
- Veterinary Diagnostic Laboratory, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai, Thailand
| | - Kidsadagon Pringproa
- Department of Veterinary Biosciences and Public Health, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai, Thailand.,Excellence Center in Veterinary Bioscience, Chiang Mai University, Chiang Mai, Thailand
| | - Supamit Mekchay
- Department of Animal and Aquatic Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai, Thailand
| | - Korakot Nganvongpanit
- Department of Veterinary Biosciences and Public Health, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai, Thailand.,Excellence Center in Veterinary Bioscience, Chiang Mai University, Chiang Mai, Thailand
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Significant Association of rs2147555 Genetic Polymorphism in the EDNRB Gene with Hirschsprung Disease in Southern Chinese Children. BIOMED RESEARCH INTERNATIONAL 2020; 2020:5956412. [PMID: 33178831 PMCID: PMC7648675 DOI: 10.1155/2020/5956412] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 09/26/2020] [Accepted: 10/19/2020] [Indexed: 12/13/2022]
Abstract
Hirschsprung disease (HSCR) is a human birth defect at the clinical setting, usually characterized by an absent enteric nervous system (ENS) from the distal bowel. The majority of HSCR cases represent a complex disorder resulting from the interaction of multiple genetic and environmental factors. Genetic events have been described to be involved in the abnormal development of the enteric nervous system. Although variants in several genes like RET and EDNRB have been suggested to contribute major risks to HSCR, very little is known about their involvement in the onset of HSCR. Here, we studied a large Chinese Han cohort consisting of 1,470 HSCR patients and 1,473 non-HSCR controls to further test whether there are more variants in EDNRB associated with HSCR. Our results provided the first evidence that rs2147555 in EDNRB confers a significant risk of HSCR in a Chinese Han population for both allelic frequencies (P = 4.16 × 10−3; OR = 1.29) and genotypic frequencies assuming either a dominant or recessive model (P = 0.011 and P = 0.027, respectively). When different subtypes of HSCR cases were analyzed, the association remained significant (OR = 1.33, P = 0.003 for short-segment HSCR; OR = 1.34, P = 0.044 for long segment HSCR).
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Fu M, Barlow-Anacker AJ, Kuruvilla KP, Bowlin GL, Seidel CW, Trainor PA, Gosain A. 37/67-laminin receptor facilitates neural crest cell migration during enteric nervous system development. FASEB J 2020; 34:10931-10947. [PMID: 32592286 DOI: 10.1096/fj.202000699r] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 05/28/2020] [Accepted: 06/08/2020] [Indexed: 12/16/2022]
Abstract
Enteric nervous system (ENS) development is governed by interactions between neural crest cells (NCC) and the extracellular matrix (ECM). Hirschsprung disease (HSCR) results from incomplete NCC migration and failure to form an appropriate ENS. Prior studies implicate abnormal ECM in NCC migration failure. We performed a comparative microarray of the embryonic distal hindgut of wild-type and EdnrBNCC-/- mice that model HSCR and identified laminin-β1 as upregulated in EdnrBNCC-/- colon. We identified decreased expression of 37/67 kDa laminin receptor (LAMR), which binds laminin-β1, in human HSCR myenteric plexus and EdnrBNCC-/- NCC. Using a combination of in vitro gut slice cultures and ex vivo organ cultures, we determined the mechanistic role of LAMR in NCC migration. We found that enteric NCC express LAMR, which is downregulated in human and murine HSCR. Binding of LAMR by the laminin-β1 analog YIGSR promotes NCC migration. Silencing of LAMR abrogated these effects. Finally, applying YIGSR to E13.5 EdnrBNCC-/- colon explants resulted in 80%-100% colonization of the hindgut. This study adds LAMR to the large list of receptors through which NCC interact with their environment during ENS development. These results should be used to inform ongoing integrative, regenerative medicine approaches to HSCR.
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Affiliation(s)
- Ming Fu
- Division of Pediatric Surgery, Department of Surgery, University of Tennessee Health Sciences Center, Memphis, TN, USA
| | - Amanda J Barlow-Anacker
- Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Korah P Kuruvilla
- Division of Pediatric Surgery, Department of Surgery, University of Tennessee Health Sciences Center, Memphis, TN, USA
| | - Gary L Bowlin
- Department of Biomedical Engineering, University of Memphis, Memphis, TN, USA
| | | | - Paul A Trainor
- Stowers Institute for Medical Research, Kansas City, MO, USA.,Department of Anatomy and Cell Biology, University of Kansas School of Medicine, Kansas City, KS, USA
| | - Ankush Gosain
- Division of Pediatric Surgery, Department of Surgery, University of Tennessee Health Sciences Center, Memphis, TN, USA.,Children's Foundation Research Institute, Le Bonheur Children's Hospital, Memphis, TN, USA
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Role of alpha-melanocyte stimulating hormone (α-MSH) in modulating the molecular mechanism adopted by melanocytes of Bos indicus under UVR stress. Mol Cell Biochem 2019; 465:141-153. [PMID: 31823188 DOI: 10.1007/s11010-019-03674-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 12/07/2019] [Indexed: 12/23/2022]
Abstract
Ultraviolet radiations (UVR) are responsible for a wide variety of acute and chronic effects on the animal skin. However, the effect of UVR-induced oxidative stress and protection through paracrine factors on animal skin has received little attention. We previously demonstrated how heat stress-induced adaptation in Bos indicus melanocytes was dependent on the level of melanin and reduction of apoptosis. Therefore, in the present investigation, the survival mechanisms adopted by melanocytes under UV stress and the role of α-MSH in cell survival under in vitro conditions were studied. After the treatment of melanocyte cells with UVR (using Osram ultravitalux 300 W lamp), analysis of Gene expression using Real-Time PCR was done to study the adopted molecular pathways under stressful conditions. In addition, α-MSH was used to assess its modulating role in cell survival under stress. This study revealed the increase in the expression of genes related to melanogenesis, cell cycle, heat shock proteins, and apoptosis of the cells after UVR stress and demonstrated the role of paracrine factor (α-MSH) in elevating the protection response to stressful conditions like UVR stress by increasing the melanogenesis and decreasing the mitochondrial-mediated apoptosis. Based on the results of the present study, it can be stated that α-MSH can play a pivotal role in the protection of animal skin cells under stressful conditions in climate-changing scenario.
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Luzón‐Toro B, Villalba‐Benito L, Torroglosa A, Fernández RM, Antiñolo G, Borrego S. What is new about the genetic background of Hirschsprung disease? Clin Genet 2019; 97:114-124. [DOI: 10.1111/cge.13615] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 07/23/2019] [Accepted: 07/25/2019] [Indexed: 01/01/2023]
Affiliation(s)
- Berta Luzón‐Toro
- Department of Maternofetal Medicine, Genetics and Reproduction, Institute of Biomedicine of Seville (IBIS)University Hospital Virgen del Rocío/CSIC/University of Seville Seville Spain
- Centre for Biomedical Network Research on Rare Diseases (CIBERER) Seville Spain
| | - Leticia Villalba‐Benito
- Department of Maternofetal Medicine, Genetics and Reproduction, Institute of Biomedicine of Seville (IBIS)University Hospital Virgen del Rocío/CSIC/University of Seville Seville Spain
- Centre for Biomedical Network Research on Rare Diseases (CIBERER) Seville Spain
| | - Ana Torroglosa
- Department of Maternofetal Medicine, Genetics and Reproduction, Institute of Biomedicine of Seville (IBIS)University Hospital Virgen del Rocío/CSIC/University of Seville Seville Spain
- Centre for Biomedical Network Research on Rare Diseases (CIBERER) Seville Spain
| | - Raquel M. Fernández
- Department of Maternofetal Medicine, Genetics and Reproduction, Institute of Biomedicine of Seville (IBIS)University Hospital Virgen del Rocío/CSIC/University of Seville Seville Spain
- Centre for Biomedical Network Research on Rare Diseases (CIBERER) Seville Spain
| | - Guillermo Antiñolo
- Department of Maternofetal Medicine, Genetics and Reproduction, Institute of Biomedicine of Seville (IBIS)University Hospital Virgen del Rocío/CSIC/University of Seville Seville Spain
- Centre for Biomedical Network Research on Rare Diseases (CIBERER) Seville Spain
| | - Salud Borrego
- Department of Maternofetal Medicine, Genetics and Reproduction, Institute of Biomedicine of Seville (IBIS)University Hospital Virgen del Rocío/CSIC/University of Seville Seville Spain
- Centre for Biomedical Network Research on Rare Diseases (CIBERER) Seville Spain
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New Genotypes and Phenotypes in Patients with 3 Subtypes of Waardenburg Syndrome Identified by Diagnostic Next-Generation Sequencing. Neural Plast 2019; 2019:7143458. [PMID: 30936914 PMCID: PMC6415303 DOI: 10.1155/2019/7143458] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 11/22/2018] [Indexed: 12/20/2022] Open
Abstract
Background Waardenburg syndrome (WS) is one of the most common forms of syndromic deafness with heterogeneity of loci and alleles and variable expressivity of clinical features. Methods The technology of single-nucleotide variants (SNV) and copy number variation (CNV) detection was developed to investigate the genotype spectrum of WS in a Chinese population. Results Ninety WS patients and 24 additional family members were recruited for the study. Fourteen mutations had not been previously reported, including c.808C>G, c.117C>A, c.152T>G, c.803G>T, c.793-3T >G, and c.801delT on PAX3; c.642_650delAAG on MITF; c.122G>T and c.127C>T on SOX10; c.230C>G and c.365C>T on SNAI2; and c.481A>G, c.1018C>G, and c.1015C>T on EDNRB. Three CNVs were de novo and first reported in our study. Five EDNRB variants were associated with WS type 1 in the heterozygous state for the first time, with a detection rate of 22.2%. Freckles occur only in WS type 2. Yellow hair, amblyopia, congenital ptosis, narrow palpebral fissures, and pigmentation spots are rare and unique symptoms in WS patients from China. Conclusions EDNRB should be considered as another prevalent pathogenic gene in WS type 1. Our study expanded the genotype and phenotype spectrum of WS, and diagnostic next-generation sequencing is promising for WS.
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Bondurand N, Dufour S, Pingault V. News from the endothelin-3/EDNRB signaling pathway: Role during enteric nervous system development and involvement in neural crest-associated disorders. Dev Biol 2018; 444 Suppl 1:S156-S169. [PMID: 30171849 DOI: 10.1016/j.ydbio.2018.08.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 08/27/2018] [Accepted: 08/27/2018] [Indexed: 01/08/2023]
Abstract
The endothelin system is a vertebrate-specific innovation with important roles in regulating the cardiovascular system and renal and pulmonary processes, as well as the development of the vertebrate-specific neural crest cell population and its derivatives. This system is comprised of three structurally similar 21-amino acid peptides that bind and activate two G-protein coupled receptors. In 1994, knockouts of the Edn3 and Ednrb genes revealed their crucial function during development of the enteric nervous system and melanocytes, two neural-crest derivatives. Since then, human and mouse genetics, combined with cellular and developmental studies, have helped to unravel the role of this signaling pathway during development and adulthood. In this review, we will summarize the known functions of the EDN3/EDNRB pathway during neural crest development, with a specific focus on recent scientific advances, and the enteric nervous system in normal and pathological conditions.
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Affiliation(s)
- Nadege Bondurand
- Laboratory of Embryology and Genetics of Congenital Malformations, INSERM U1163, Institut Imagine, Paris, France; Paris Descartes-Sorbonne Paris Cité University, Institut Imagine, Paris, France.
| | - Sylvie Dufour
- INSERM, U955, Equipe 06, Créteil 94000, France; Université Paris Est, Faculté de Médecine, Créteil 94000, France
| | - Veronique Pingault
- Laboratory of Embryology and Genetics of Congenital Malformations, INSERM U1163, Institut Imagine, Paris, France; Paris Descartes-Sorbonne Paris Cité University, Institut Imagine, Paris, France; Service de Génétique Moléculaire, Hôpital Necker-Enfants Malades, Assistance Publique - Hôpitaux de Paris, Paris, France
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Meisel JS, Sfyroera G, Bartow-McKenney C, Gimblet C, Bugayev J, Horwinski J, Kim B, Brestoff JR, Tyldsley AS, Zheng Q, Hodkinson BP, Artis D, Grice EA. Commensal microbiota modulate gene expression in the skin. MICROBIOME 2018; 6:20. [PMID: 29378633 PMCID: PMC5789709 DOI: 10.1186/s40168-018-0404-9] [Citation(s) in RCA: 128] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 01/18/2018] [Indexed: 05/10/2023]
Abstract
BACKGROUND The skin harbors complex communities of resident microorganisms, yet little is known of their physiological roles and the molecular mechanisms that mediate cutaneous host-microbe interactions. Here, we profiled skin transcriptomes of mice reared in the presence and absence of microbiota to elucidate the range of pathways and functions modulated in the skin by the microbiota. RESULTS A total of 2820 genes were differentially regulated in response to microbial colonization and were enriched in gene ontology (GO) terms related to the host-immune response and epidermal differentiation. Innate immune response genes and genes involved in cytokine activity were generally upregulated in response to microbiota and included genes encoding toll-like receptors, antimicrobial peptides, the complement cascade, and genes involved in IL-1 family cytokine signaling and homing of T cells. Our results also reveal a role for the microbiota in modulating epidermal differentiation and development, with differential expression of genes in the epidermal differentiation complex (EDC). Genes with correlated co-expression patterns were enriched in binding sites for the transcription factors Klf4, AP-1, and SP-1, all implicated as regulators of epidermal differentiation. Finally, we identified transcriptional signatures of microbial regulation common to both the skin and the gastrointestinal tract. CONCLUSIONS With this foundational approach, we establish a critical resource for understanding the genome-wide implications of microbially mediated gene expression in the skin and emphasize prospective ways in which the microbiome contributes to skin health and disease.
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Affiliation(s)
- Jacquelyn S Meisel
- Department of Dermatology, University of Pennsylvania Perelman School of Medicine, 421 Curie Blvd, 1015 BRB II/III, Philadelphia, PA, 19104, USA
| | - Georgia Sfyroera
- Department of Dermatology, University of Pennsylvania Perelman School of Medicine, 421 Curie Blvd, 1015 BRB II/III, Philadelphia, PA, 19104, USA
| | - Casey Bartow-McKenney
- Department of Dermatology, University of Pennsylvania Perelman School of Medicine, 421 Curie Blvd, 1015 BRB II/III, Philadelphia, PA, 19104, USA
| | - Ciara Gimblet
- Department of Dermatology, University of Pennsylvania Perelman School of Medicine, 421 Curie Blvd, 1015 BRB II/III, Philadelphia, PA, 19104, USA
| | - Julia Bugayev
- Department of Dermatology, University of Pennsylvania Perelman School of Medicine, 421 Curie Blvd, 1015 BRB II/III, Philadelphia, PA, 19104, USA
| | - Joseph Horwinski
- Department of Dermatology, University of Pennsylvania Perelman School of Medicine, 421 Curie Blvd, 1015 BRB II/III, Philadelphia, PA, 19104, USA
| | - Brian Kim
- Department of Dermatology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Jonathan R Brestoff
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Amanda S Tyldsley
- Department of Dermatology, University of Pennsylvania Perelman School of Medicine, 421 Curie Blvd, 1015 BRB II/III, Philadelphia, PA, 19104, USA
| | - Qi Zheng
- Department of Dermatology, University of Pennsylvania Perelman School of Medicine, 421 Curie Blvd, 1015 BRB II/III, Philadelphia, PA, 19104, USA
| | - Brendan P Hodkinson
- Department of Dermatology, University of Pennsylvania Perelman School of Medicine, 421 Curie Blvd, 1015 BRB II/III, Philadelphia, PA, 19104, USA
| | - David Artis
- Jill Roberts Institute for Research in Inflammatory Bowel Disease, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medicine, Cornell University, New York, NY, 10021, USA
| | - Elizabeth A Grice
- Department of Dermatology, University of Pennsylvania Perelman School of Medicine, 421 Curie Blvd, 1015 BRB II/III, Philadelphia, PA, 19104, USA.
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14
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RET somatic mutations are underrecognized in Hirschsprung disease. Genet Med 2017; 20:770-777. [PMID: 29261189 DOI: 10.1038/gim.2017.178] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 09/12/2017] [Indexed: 12/19/2022] Open
Abstract
PURPOSE We aimed to determine the frequency of RET mosaicism in Hirschsprung disease (HSCR), test whether it has been underestimated, and to assess its contribution to HSCR risk. METHODS Targeted exome sequencing (n = 83) and RET single-gene screening (n = 69) were performed. Amplicon-based deep sequencing was applied on multiple tissue samples. TA cloning and sequencing were conducted for validation. RESULTS We identified eight de novo mutations in 152 patients (5.2%), of which six were pathogenic mosaic mutations. Two of these patients were somatic mosaics, with mutations detected in blood, colon, and saliva (mutant allele frequency: 35-44%). In addition, germ-line mosaicism was identified in four clinically unaffected subjects, each with an affected child, in multiple tissues (mutant allele frequency: 1-28%). CONCLUSION Somatic mutations of the RET gene are underrecognized in HSCR. Molecular investigation of the parents of patients with seemingly sporadic mutations is essential to determine recurrence risk in these families.
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Wu N, Qin H, Wang M, Bian Y, Dong B, Sun G, Zhao W, Chang G, Xu Q, Chen G. Variations in endothelin receptor B subtype 2 (EDNRB2) coding sequences and mRNA expression levels in 4 Muscovy duck plumage colour phenotypes. Br Poult Sci 2017; 58:116-121. [DOI: 10.1080/00071668.2016.1259531] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- N. Wu
- Key Laboratory of Animal Genetics and Breeding and Molecular Design of Jiangsu Province, Yangzhou University, Yangzhou, People’s Republic of China
| | - H. Qin
- National Waterfowl Germplasm Resource Pool, Taizhou, People’s Republic of China
| | - M. Wang
- Key Laboratory of Animal Genetics and Breeding and Molecular Design of Jiangsu Province, Yangzhou University, Yangzhou, People’s Republic of China
| | - Y. Bian
- National Waterfowl Germplasm Resource Pool, Taizhou, People’s Republic of China
| | - B. Dong
- National Waterfowl Germplasm Resource Pool, Taizhou, People’s Republic of China
| | - G. Sun
- National Waterfowl Germplasm Resource Pool, Taizhou, People’s Republic of China
| | - W. Zhao
- Key Laboratory of Animal Genetics and Breeding and Molecular Design of Jiangsu Province, Yangzhou University, Yangzhou, People’s Republic of China
| | - G. Chang
- Key Laboratory of Animal Genetics and Breeding and Molecular Design of Jiangsu Province, Yangzhou University, Yangzhou, People’s Republic of China
| | - Q. Xu
- Key Laboratory of Animal Genetics and Breeding and Molecular Design of Jiangsu Province, Yangzhou University, Yangzhou, People’s Republic of China
| | - G. Chen
- Key Laboratory of Animal Genetics and Breeding and Molecular Design of Jiangsu Province, Yangzhou University, Yangzhou, People’s Republic of China
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16
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Torroglosa A, Alves MM, Fernández RM, Antiñolo G, Hofstra RM, Borrego S. Epigenetics in ENS development and Hirschsprung disease. Dev Biol 2016; 417:209-16. [PMID: 27321561 DOI: 10.1016/j.ydbio.2016.06.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2016] [Revised: 06/10/2016] [Accepted: 06/13/2016] [Indexed: 12/18/2022]
Abstract
Hirschsprung disease (HSCR, OMIM 142623) is a neurocristopathy caused by a failure of the enteric nervous system (ENS) progenitors derived from neural crest cells (NCCs), to migrate, proliferate, differentiate or survive to and within the gastrointestinal tract, resulting in aganglionosis in the distal colon. The formation of the ENS is a complex process, which is regulated by a large range of molecules and signalling pathways involving both the NCCs and the intestinal environment. This tightly regulated process needs correct regulation of the expression of ENS specific genes. Alterations in the expression of these genes can have dramatic consequences. Several mechanisms that control the expression of genes have been described, such as DNA modification (epigenetic mechanisms), regulation of transcription (transcription factor, enhancers, repressors and silencers), post-transcriptional regulation (3'UTR and miRNAs) and regulation of translation. In this review, we focus on the epigenetic DNA modifications that have been described so far in the context of the ENS development. Moreover we describe the changes that are found in relation to the onset of HSCR.
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Affiliation(s)
- A Torroglosa
- Department of Genetics, Reproduction and Fetal Medicine, Institute of Biomedicine of Seville (IBIS), University Hospital Virgen del Rocío/CSIC/University of Seville, Seville, Spain; Centre for Biomedical Network Research on Rare Diseases (CIBERER), Seville, Spain
| | - M M Alves
- Department of Clinical Genetics, Erasmus Medical Center, Rotterdam, The Netherlands
| | - R M Fernández
- Department of Genetics, Reproduction and Fetal Medicine, Institute of Biomedicine of Seville (IBIS), University Hospital Virgen del Rocío/CSIC/University of Seville, Seville, Spain; Centre for Biomedical Network Research on Rare Diseases (CIBERER), Seville, Spain
| | - G Antiñolo
- Department of Genetics, Reproduction and Fetal Medicine, Institute of Biomedicine of Seville (IBIS), University Hospital Virgen del Rocío/CSIC/University of Seville, Seville, Spain; Centre for Biomedical Network Research on Rare Diseases (CIBERER), Seville, Spain
| | - R M Hofstra
- Department of Clinical Genetics, Erasmus Medical Center, Rotterdam, The Netherlands; Stem Cells and Regenerative Medicine, Birth Defects Research Centre UCL Institute of Child Health, London, UK
| | - S Borrego
- Department of Genetics, Reproduction and Fetal Medicine, Institute of Biomedicine of Seville (IBIS), University Hospital Virgen del Rocío/CSIC/University of Seville, Seville, Spain; Centre for Biomedical Network Research on Rare Diseases (CIBERER), Seville, Spain.
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17
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Extrinsic innervation of ileum and pelvic flexure of foals with ileocolonic aganglionosis. Cell Tissue Res 2016; 366:13-22. [DOI: 10.1007/s00441-016-2422-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 05/02/2016] [Indexed: 12/20/2022]
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18
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Shinde V, Hoelting L, Srinivasan SP, Meisig J, Meganathan K, Jagtap S, Grinberg M, Liebing J, Bluethgen N, Rahnenführer J, Rempel E, Stoeber R, Schildknecht S, Förster S, Godoy P, van Thriel C, Gaspar JA, Hescheler J, Waldmann T, Hengstler JG, Leist M, Sachinidis A. Definition of transcriptome-based indices for quantitative characterization of chemically disturbed stem cell development: introduction of the STOP-Tox ukn and STOP-Tox ukk tests. Arch Toxicol 2016; 91:839-864. [PMID: 27188386 PMCID: PMC5306084 DOI: 10.1007/s00204-016-1741-8] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Accepted: 05/04/2016] [Indexed: 01/08/2023]
Abstract
Stem cell-based in vitro test systems can recapitulate specific phases of human development. In the UKK test system, human pluripotent stem cells (hPSCs) randomly differentiate into cells of the three germ layers and their derivatives. In the UKN1 test system, hPSCs differentiate into early neural precursor cells. During the normal differentiation period (14 days) of the UKK system, 570 genes [849 probe sets (PSs)] were regulated >fivefold; in the UKN1 system (6 days), 879 genes (1238 PSs) were regulated. We refer to these genes as 'developmental genes'. In the present study, we used genome-wide expression data of 12 test substances in the UKK and UKN1 test systems to understand the basic principles of how chemicals interfere with the spontaneous transcriptional development in both test systems. The set of test compounds included six histone deacetylase inhibitors (HDACis), six mercury-containing compounds ('mercurials') and thalidomide. All compounds were tested at the maximum non-cytotoxic concentration, while valproic acid and thalidomide were additionally tested over a wide range of concentrations. In total, 242 genes (252 PSs) in the UKK test system and 793 genes (1092 PSs) in the UKN1 test system were deregulated by the 12 test compounds. We identified sets of 'diagnostic genes' appropriate for the identification of the influence of HDACis or mercurials. Test compounds that interfered with the expression of developmental genes usually antagonized their spontaneous development, meaning that up-regulated developmental genes were suppressed and developmental genes whose expression normally decreases were induced. The fraction of compromised developmental genes varied widely between the test compounds, and it reached up to 60 %. To quantitatively describe disturbed development on a genome-wide basis, we recommend a concept of two indices, 'developmental potency' (D p) and 'developmental index' (D i), whereby D p is the fraction of all developmental genes that are up- or down-regulated by a test compound, and D i is the ratio of overrepresentation of developmental genes among all genes deregulated by a test compound. The use of D i makes hazard identification more sensitive because some compounds compromise the expression of only a relatively small number of genes but have a high propensity to deregulate developmental genes specifically, resulting in a low D p but a high D i. In conclusion, the concept based on the indices D p and D i offers the possibility to quantitatively express the propensity of test compounds to interfere with normal development.
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Affiliation(s)
- Vaibhav Shinde
- Institute of Neurophysiology and Centre for Molecular Medicine Cologne (CMMC), University of Cologne (UKK), Robert-Koch-Str. 39, 50931, Cologne, Germany
| | - Lisa Hoelting
- Doerenkamp-Zbinden Chair for In Vitro Toxicology and Biomedicine, University of Konstanz, Box: M657, 78457, Constance, Germany.,Konstanz Graduate School Chemical Biology KORS-CB, University of Konstanz, 78457, Constance, Germany
| | - Sureshkumar Perumal Srinivasan
- Institute of Neurophysiology and Centre for Molecular Medicine Cologne (CMMC), University of Cologne (UKK), Robert-Koch-Str. 39, 50931, Cologne, Germany
| | - Johannes Meisig
- Institute of Pathology, Charité Universitätsmedizin, 10117, Berlin, Germany.,Integrative Research Institute for the Life Sciences, Institute for Theoretical Biology, Humboldt Universität, 10115, Berlin, Germany
| | - Kesavan Meganathan
- Institute of Neurophysiology and Centre for Molecular Medicine Cologne (CMMC), University of Cologne (UKK), Robert-Koch-Str. 39, 50931, Cologne, Germany
| | - Smita Jagtap
- Institute of Neurophysiology and Centre for Molecular Medicine Cologne (CMMC), University of Cologne (UKK), Robert-Koch-Str. 39, 50931, Cologne, Germany
| | | | - Julia Liebing
- Leibniz Research Centre for Working Environment and Human Factors at the Technical, University of Dortmund (IfADo), Ardeystrasse 67, 44139, Dortmund, Germany
| | - Nils Bluethgen
- Institute of Pathology, Charité Universitätsmedizin, 10117, Berlin, Germany.,Integrative Research Institute for the Life Sciences, Institute for Theoretical Biology, Humboldt Universität, 10115, Berlin, Germany
| | | | - Eugen Rempel
- Department of Statistics, TU Dortmund University, Dortmund, Germany.,Centre for Organismal Studies, Heidelberg University, 69120, Heidelberg, Germany
| | - Regina Stoeber
- Leibniz Research Centre for Working Environment and Human Factors at the Technical, University of Dortmund (IfADo), Ardeystrasse 67, 44139, Dortmund, Germany
| | - Stefan Schildknecht
- Doerenkamp-Zbinden Chair for In Vitro Toxicology and Biomedicine, University of Konstanz, Box: M657, 78457, Constance, Germany
| | - Sunniva Förster
- Doerenkamp-Zbinden Chair for In Vitro Toxicology and Biomedicine, University of Konstanz, Box: M657, 78457, Constance, Germany
| | - Patricio Godoy
- Leibniz Research Centre for Working Environment and Human Factors at the Technical, University of Dortmund (IfADo), Ardeystrasse 67, 44139, Dortmund, Germany
| | - Christoph van Thriel
- Leibniz Research Centre for Working Environment and Human Factors at the Technical, University of Dortmund (IfADo), Ardeystrasse 67, 44139, Dortmund, Germany
| | - John Antonydas Gaspar
- Institute of Neurophysiology and Centre for Molecular Medicine Cologne (CMMC), University of Cologne (UKK), Robert-Koch-Str. 39, 50931, Cologne, Germany
| | - Jürgen Hescheler
- Institute of Neurophysiology and Centre for Molecular Medicine Cologne (CMMC), University of Cologne (UKK), Robert-Koch-Str. 39, 50931, Cologne, Germany
| | - Tanja Waldmann
- Doerenkamp-Zbinden Chair for In Vitro Toxicology and Biomedicine, University of Konstanz, Box: M657, 78457, Constance, Germany
| | - Jan G Hengstler
- Leibniz Research Centre for Working Environment and Human Factors at the Technical, University of Dortmund (IfADo), Ardeystrasse 67, 44139, Dortmund, Germany.
| | - Marcel Leist
- Doerenkamp-Zbinden Chair for In Vitro Toxicology and Biomedicine, University of Konstanz, Box: M657, 78457, Constance, Germany.
| | - Agapios Sachinidis
- Institute of Neurophysiology and Centre for Molecular Medicine Cologne (CMMC), University of Cologne (UKK), Robert-Koch-Str. 39, 50931, Cologne, Germany.
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19
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Widowati T, Melhem S, Patria SY, de Graaf BM, Sinke RJ, Viel M, Dijkhuis J, Sadewa AH, Purwohardjono R, Soenarto Y, Hofstra RM, Sribudiani Y. RET and EDNRB mutation screening in patients with Hirschsprung disease: Functional studies and its implications for genetic counseling. Eur J Hum Genet 2015; 24:823-9. [PMID: 26395553 DOI: 10.1038/ejhg.2015.214] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 08/24/2015] [Accepted: 08/27/2015] [Indexed: 12/22/2022] Open
Abstract
Hirschsprung disease (HSCR) is a major cause of chronic constipation in children. HSCR can be caused by germline mutations in RET and EDNRB. Defining causality of the mutations identified is difficult and almost exclusively based on in silico predictions. Therefore, the reported frequency of pathogenic mutations might be overestimated. We combined mutation analysis with functional assays to determine the frequencies of proven pathogenic RET and EDNRB mutations in HSCR. We sequenced RET and EDNRB in 57 HSCR patients. The identified RET-coding variants were introduced into RET constructs and these were transfected into HEK293 cells to determine RET phosphorylation and activation via ERK. An exon trap experiment was performed to check a possible splice-site mutation. We identified eight rare RET-coding variants, one possible splice-site variant, but no rare EDNRB variants. Western blotting showed that three coding variants p.(Pr270Leu), p.(Ala756Val) and p.(Tyr1062Cys) resulted in lower activation of RET. Moreover, only two RET variants (p.(Ala756Val) and p.(Tyr1062Cys)) resulted in reduced ERK activation. Splice-site assays on c.1880-11A>G could not confirm its pathogenicity. Our data suggest that indeed almost half of the identified rare variants are proven pathogenic and that, hence, functional studies are essential for proper genetic counseling.
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Affiliation(s)
- Titis Widowati
- Department of Pediatric, Faculty of Medicine, Universitas Gadjah Mada, Prof.Dr Sardjito Hospital, Yogyakarta, Indonesia
| | - Shamiram Melhem
- Department of Clinical Genetic, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Suryono Y Patria
- Department of Pediatric, Faculty of Medicine, Universitas Gadjah Mada, Prof.Dr Sardjito Hospital, Yogyakarta, Indonesia
| | - Bianca M de Graaf
- Department of Clinical Genetic, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Richard J Sinke
- Department of Genetic, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Martijn Viel
- Department of Genetic, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Jos Dijkhuis
- Department of Genetic, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Ahmad H Sadewa
- Department of Biochemistry, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Rochadi Purwohardjono
- Department of Pediatric Surgery, Faculty of Medicine, Universitas Gadjah Mada, Prof.Dr Sardjito Hospital, Yogyakarta, Indonesia
| | - Yati Soenarto
- Department of Pediatric, Faculty of Medicine, Universitas Gadjah Mada, Prof.Dr Sardjito Hospital, Yogyakarta, Indonesia
| | - Robert Mw Hofstra
- Department of Clinical Genetic, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Yunia Sribudiani
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
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20
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Song J, Feng Y, Acke FR, Coucke P, Vleminckx K, Dhooge IJ. Hearing loss in Waardenburg syndrome: a systematic review. Clin Genet 2015; 89:416-425. [PMID: 26100139 DOI: 10.1111/cge.12631] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Revised: 06/18/2015] [Accepted: 06/18/2015] [Indexed: 01/14/2023]
Abstract
Waardenburg syndrome (WS) is a rare genetic disorder characterized by hearing loss (HL) and pigment disturbances of hair, skin and iris. Classifications exist based on phenotype and genotype. The auditory phenotype is inconsistently reported among the different Waardenburg types and causal genes, urging the need for an up-to-date literature overview on this particular topic. We performed a systematic review in search for articles describing auditory features in WS patients along with the associated genotype. Prevalences of HL were calculated and correlated with the different types and genes of WS. Seventy-three articles were included, describing 417 individual patients. HL was found in 71.0% and was predominantly bilateral and sensorineural. Prevalence of HL among the different clinical types significantly differed (WS1: 52.3%, WS2: 91.6%, WS3: 57.1%, WS4: 83.5%). Mutations in SOX10 (96.5%), MITF (89.6%) and SNAI2 (100%) are more frequently associated with hearing impairment than other mutations. Of interest, the distinct disease-causing genes are able to better predict the auditory phenotype compared with different clinical types of WS. Consequently, it is important to confirm the clinical diagnosis of WS with molecular analysis in order to optimally inform patients about the risk of HL.
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Affiliation(s)
- J Song
- Department of Otolaryngology, Xiangya Hospital, Central South University, Changsha, People's Republic of China
| | - Y Feng
- Department of Otolaryngology, Xiangya Hospital, Central South University, Changsha, People's Republic of China
| | - F R Acke
- Department of Otorhinolaryngology, Ghent University/Ghent University Hospital, Ghent, Belgium
| | - P Coucke
- Department of Medical Genetics, Ghent University/Ghent University Hospital, Ghent, Belgium
| | - K Vleminckx
- Department of Medical Genetics, Ghent University/Ghent University Hospital, Ghent, Belgium.,Department for Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - I J Dhooge
- Department of Otorhinolaryngology, Ghent University/Ghent University Hospital, Ghent, Belgium
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21
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Abstract
Horses are valued for the beauty and variety of colouration and coat patterning. To date, eleven different genes have been characterized that contribute to the variation observed in the horse. Unfortunately, mutations involving pigmentation often lead to deleterious effects in other systems, some of which have been described in the horse. This review focuses on six such pleiotropic effects or associations with pigmentation genes. These include neurological defects (lethal white foal syndrome and lavender foal syndrome), hearing defects, eye disorders (congenital stationary night blindness and multiple congenital ocular anomalies), as well as horse-specific melanoma. The pigmentation phenotype, disorder phenotype, mode of inheritance, genetic or genomic methods utilized to identify the genes involved and, if known, the causative mutations, molecular interactions and other susceptibility loci are discussed. As our understanding of pigmentation in the horse increases, through the use of novel genomic tools, we are likely to unravel yet unknown pleiotropic effects and determine additional interactions between previously discovered loci.
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Affiliation(s)
- R R Bellone
- Department of Biology, University of Tampa, 401 W. Kennedy Blvd., Tampa, FL 33606, USA.
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22
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Ayarpadikannan S, Lee HE, Han K, Kim HS. Transposable element-driven transcript diversification and its relevance to genetic disorders. Gene 2015; 558:187-94. [PMID: 25617522 DOI: 10.1016/j.gene.2015.01.039] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 01/13/2015] [Accepted: 01/20/2015] [Indexed: 12/14/2022]
Abstract
The human genome project and subsequent gene annotation projects have shown that the human genome contains 22,000-25,000 functional genes. Therefore, it is believed that the diversity of protein repertoire is achieved by the alternative splicing (AS) mechanism. Transposable elements (TEs) are mobile in nature and can therefore alter their position in the genome. The insertion of TEs into a new gene region can result in AS of a particular transcript through various mechanisms, including intron retention, and alternative donor or acceptor splice sites. TE-derived AS is thought to have played a part in primate evolution and in hominid radiation. However, TE-derived AS or genetic instability may sometimes result in genetic disorders. For the past two decades, numerous studies have been performed on TEs and their role in genomes. Accumulating evidence shows that the term 'junk DNA', previously used for TEs is a misnomer. Recent research has indicated that TEs may have clinical potential. However, to explore the feasibility of using TEs in clinical practice, additional studies are required. This review summarizes the available literature on TE-derived AS, alternative promoter, and alternative polyadenylation. The review covers the effects of TEs on coding genes and their clinical implications, and provides our perspectives and directions for future research.
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Affiliation(s)
- Selvam Ayarpadikannan
- Department of Biological Sciences, College of Natural Sciences, Pusan National University, Busan 609-735, Republic of Korea
| | - Hee-Eun Lee
- Department of Biological Sciences, College of Natural Sciences, Pusan National University, Busan 609-735, Republic of Korea
| | - Kyudong Han
- Department of Nanobiomedical Science, WCU Research Center, Dankook University, Cheonan 330-714, Republic of Korea
| | - Heui-Soo Kim
- Department of Biological Sciences, College of Natural Sciences, Pusan National University, Busan 609-735, Republic of Korea.
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23
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Braasch I, Schartl M. Evolution of endothelin receptors in vertebrates. Gen Comp Endocrinol 2014; 209:21-34. [PMID: 25010382 DOI: 10.1016/j.ygcen.2014.06.028] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 06/07/2014] [Accepted: 06/26/2014] [Indexed: 02/03/2023]
Abstract
Endothelin receptors are G protein coupled receptors (GPCRs) of the β-group of rhodopsin receptors that bind to endothelin ligands, which are 21 amino acid long peptides derived from longer prepro-endothelin precursors. The most basal Ednr-like GPCR is found outside vertebrates in the cephalochordate amphioxus, but endothelin ligands are only present among vertebrates, including the lineages of jawless vertebrates (lampreys and hagfishes), cartilaginous vertebrates (sharks, rays, and chimaeras), and bony vertebrates (ray-finned fishes and lobe-finned vertebrates including tetrapods). A bona fide endothelin system is thus a vertebrate-specific innovation with important roles for regulating the cardiovascular system, renal and pulmonary processes, as well as for the development of the vertebrate-specific neural crest cell population and its derivatives. Expectedly, dysregulation of endothelin receptors and the endothelin system leads to a multitude of human diseases. Despite the importance of different types of endothelin receptors for vertebrate development and physiology, current knowledge on endothelin ligand-receptor interactions, on the expression of endothelin receptors and their ligands, and on the functional roles of the endothelin system for embryonic development and in adult vertebrates is very much biased towards amniote vertebrates. Recent analyses from a variety of vertebrate lineages, however, have shown that the endothelin system in lineages such as teleost fish and lampreys is more diverse and is divergent from the mammalian endothelin system. This diversity is mainly based on differential evolution of numerous endothelin system components among vertebrate lineages generated by two rounds of whole genome duplication (three in teleosts) during vertebrate evolution. Here we review current understanding of the evolutionary history of the endothelin receptor family in vertebrates supplemented with surveys on the endothelin receptor gene complement of newly available genome assemblies from phylogenetically informative taxa. Our assessment further highlights the diversity of the vertebrate endothelin system and calls for detailed functional and pharmacological analyses of the endothelin system beyond tetrapods.
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Affiliation(s)
- Ingo Braasch
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403-1254, USA.
| | - Manfred Schartl
- Department of Physiological Chemistry, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany; Comprehensive Cancer Center, University Clinic Würzburg, Josef Schneider Straße 6, 97080 Würzburg, Germany.
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24
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Kinoshita K, Akiyama T, Mizutani M, Shinomiya A, Ishikawa A, Younis HH, Tsudzuki M, Namikawa T, Matsuda Y. Endothelin receptor B2 (EDNRB2) is responsible for the tyrosinase-independent recessive white (mo(w) ) and mottled (mo) plumage phenotypes in the chicken. PLoS One 2014; 9:e86361. [PMID: 24466053 PMCID: PMC3900529 DOI: 10.1371/journal.pone.0086361] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Accepted: 12/08/2013] [Indexed: 12/03/2022] Open
Abstract
A mutation that confers white plumage with black eyes was identified in the Minohiki breed of Japanese native chicken (Gallus gallus domesticus). The white plumage, with a few partially pigmented feathers, was not associated with the tyrosinase gene, and displayed an autosomal recessive mode of inheritance against the pigmented phenotype. All F1 offspring derived from crosses with mottled chickens (mo/mo), which show characteristic pigmented feathers with white tips, had plumage with a mottled-like pattern. This result indicates that the white plumage mutation is a novel allele at the mo locus; we propose the gene symbol mo(w) for this mutant allele. Furthermore, the F1 hybrid between the mo(w) /mo(w) chicken and the panda (s/s) mutant of Japanese quail (Coturnix japonica), whose causative gene is the endothelin receptor B2 (EDNRB2) gene, showed a mo(w)/mo(w) chicken-like plumage, suggesting the possibility that the mutations in parental species are alleles of the same gene, EDNRB2. Nucleotide sequencing of the entire coding region of EDNRB2 revealed a non-synonymous G1008T substitution, which causes Cys244Phe amino acid substitution in exon 5 (which is part of the extracellular loop between the putative fourth and fifth transmembrane domains of EDNRB2) in the mutant chicken. This Cys244Phe mutation was also present in individuals of four Japanese breeds with white plumage. We also identified a non-synonymous substitution leading to Arg332His substitution that was responsible for the mottled (mo/mo) plumage phenotype. These results suggest that the EDN3 (endothelin 3)-EDNRB2 signaling is essential for normal pigmentation in birds, and that the mutations of EDNRB2 may cause defective binding of the protein with endothelins, which interferes with melanocyte differentiation, proliferation, and migration.
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Affiliation(s)
- Keiji Kinoshita
- Avian Bioscience Research Center, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
| | | | - Makoto Mizutani
- Avian Bioscience Research Center, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
| | - Ai Shinomiya
- Department of Biology, Keio University, Yokohama, Japan
| | - Akira Ishikawa
- Laboratory of Animal Genetics, Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
| | - Hassan Hassan Younis
- Laboratory of Animal Genetics, Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
- Department of Poultry Production, Faculty of Agriculture, Kafr El-Sheikh University, Kafr El-Sheikh, Egypt
| | - Masaoki Tsudzuki
- Laboratory of Animal Breeding and Genetics, Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan
- Japanese Avian Bioresource Project Research Center, Hiroshima University, Higashi-Hiroshima, Japan
| | - Takao Namikawa
- Avian Bioscience Research Center, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
| | - Yoichi Matsuda
- Avian Bioscience Research Center, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
- Laboratory of Animal Genetics, Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
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25
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Burkardt DD, Graham JM, Short SS, Frykman PK. Advances in Hirschsprung disease genetics and treatment strategies: an update for the primary care pediatrician. Clin Pediatr (Phila) 2014; 53:71-81. [PMID: 24002048 DOI: 10.1177/0009922813500846] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Hirschsprung disease (HSCR) is a multigenic condition with variable presentation. Most commonly, it presents in the neonatal period as a functional intestinal obstruction secondary to failure of caudal migration of the enteric nervous system. Classically, this manifests as dilated proximal bowel and constricted distal bowel with absent ganglia and hypertrophic nerve trunks. When recognized early, medical and surgical therapies can be instituted to minimize associated morbidity and mortality. This article reviews current understanding of the etiology of HSCR, its multigenic associations, the historical evolution of HSCR diagnosis and treatment, and current HSCR therapies.
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An XJ, Li YQ, Qu XY, Zhang J, Zhang LY, Wang M, Zhu L, Chen SY, Chen HX, Tu YT, Zhou YW, Huang CZ. Silencing endothelin-3 expression attenuates the malignant behaviors of human melanoma cells by regulating SPARC levels. ACTA ACUST UNITED AC 2013; 33:581-586. [PMID: 23904381 DOI: 10.1007/s11596-013-1162-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 04/26/2013] [Indexed: 11/29/2022]
Abstract
Endothelin-3 (ET-3) is aberrantly expressed in both metastatic melanoma tissues and cultured melanoma cells. Our previous work showed that ET-3 could promote survival of metastatic melanoma cells via its altered expression. In this study, we investigated the mechanisms responsible for these gene-induced phenotypes in melanoma cells. An ET-3 gene sequence-specific shRNA vector pLVTHM-ET3-RNAi was constructed and transfected into human malignant melanoma cells A375 and MMRU, and the resultant molecular events and cellular changes were examined. As compared with the empty-vector group, cell proliferation was slowed down, and the growth inhibition rates were 38.9% in A375 cells and 38.4% in MMRU cells after transfection. In addition, cell invasion capability was also inhibited, with a reduction of 62.2% in A375 cells and 54.3% in MMRU cells. The percentage of apoptotic cells was found to increase. Meanwhile, in both cell lines, secreted protein acidic and rich in cysteine (SPARC) levels were down-regulated together with inhibition of its upstream signaling molecule, NF-κB. Thus, the current results suggested that down-regulated expression of ET3 attenuates the malignant behaviors of human melanoma cells partially by decreasing the expression of SPARC and NF-κB.
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Affiliation(s)
- Xiang-Jie An
- Department of Dermatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Yan-Qiu Li
- Department of Dermatology, Zhongshan Hospital, Wuhan, 430033, China
| | - Xiao-Ying Qu
- Department of Dermatology, No.457 Airforce Hospital, Wuhan, 430012, China
| | - Jing Zhang
- Department of Dermatology, Wuhan General Hospital of Guangzhou Command, Wuhan, 430070, China
| | - Ling-Yun Zhang
- Department of Dermatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Ming Wang
- Department of Dermatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Li Zhu
- Department of Dermatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Si-Yuan Chen
- Department of Dermatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Hong-Xiang Chen
- Department of Dermatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Ya-Ting Tu
- Department of Dermatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Yu-Wen Zhou
- Department of Dermatology and Skin Science, University of British Columbia, Vancouver, V5Z 4E8, Canada.
| | - Chang-Zheng Huang
- Department of Dermatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
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Zaitoun I, Erickson CS, Barlow AJ, Klein TR, Heneghan AF, Pierre JF, Epstein ML, Gosain A. Altered neuronal density and neurotransmitter expression in the ganglionated region of Ednrb null mice: implications for Hirschsprung's disease. Neurogastroenterol Motil 2013; 25:e233-44. [PMID: 23360229 PMCID: PMC3578114 DOI: 10.1111/nmo.12083] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Accepted: 12/22/2012] [Indexed: 12/12/2022]
Abstract
BACKGROUND Hirschsprung's disease (HSCR) is a congenital condition in which enteric ganglia, formed from neural crest cells (NCC), are absent from the terminal bowel. Dysmotility and constipation are common features of HSCR that persist following surgical intervention. This persistence suggests that the portion of the colon that remains postoperatively is not able to support normal bowel function. To elucidate the defects that underlie this condition, we utilized a murine model of HSCR. METHODS Mice with NCC-specific deletion of Ednrb were used to measure the neuronal density and neurotransmitter expression in ganglia. KEY RESULTS At the site located proximal to the aganglionic region of P21 Ednrb null mice, the neuronal density is significantly decreased and the expression of neurotransmitters is altered compared with het animals. The ganglia in this colonic region are smaller and more isolated while the size of neuronal cell bodies is increased. The percentage of neurons expressing neuronal nNOS and VIP is significantly increased in Ednrb nulls. Conversely, the percentage of choline acetyltransferase (ChAT) expressing neurons is decreased, while Substance P is unchanged between the two genotypes. These changes are limited to the colon and are not detected in the ileum. CONCLUSIONS & INFERENCES We demonstrate changes in neuronal density and alterations in the balance of expression of neurotransmitters in the colon proximal to the aganglionic region in Ednrb null mice. The reduced neuronal density and complementary changes in nNOS and ChAT expression may account for the dysmotility seen in HSCR.
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Affiliation(s)
- Ismail Zaitoun
- Department of Neuroscience, University of Wisconsin-Madison, Madison, WI, USA
| | | | - Amanda J. Barlow
- Department of Surgery, University of Wisconsin-Madison, Madison, WI, USA
| | - Taylor R. Klein
- Department of Neuroscience, University of Wisconsin-Madison, Madison, WI, USA
| | - Aaron F. Heneghan
- Department of Surgery, University of Wisconsin-Madison, Madison, WI, USA
| | - Joseph F. Pierre
- Department of Surgery, University of Wisconsin-Madison, Madison, WI, USA
| | - Miles L. Epstein
- Department of Neuroscience, University of Wisconsin-Madison, Madison, WI, USA
| | - Ankush Gosain
- Department of Surgery, University of Wisconsin-Madison, Madison, WI, USA
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Lühken G, Fleck K, Pauciullo A, Huisinga M, Erhardt G. Familiar hypopigmentation syndrome in sheep associated with homozygous deletion of the entire endothelin type-B receptor gene. PLoS One 2012; 7:e53020. [PMID: 23300849 PMCID: PMC3534075 DOI: 10.1371/journal.pone.0053020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 11/22/2012] [Indexed: 11/24/2022] Open
Abstract
In humans, rodents and horses, pigmentary anomalies in combination with other disorders, notably intestinal aganglionosis, are associated with variants of the endothelin type-B receptor gene (EDNRB). In an inbred Cameroon sheep flock, five white lambs with light blue eyes were sired from the same ram and died within a few hours up to a few days after birth, some of them with signs of intestinal obstruction. The aim of this study was to investigate if the observed hypopigmentation and a possible lethal condition were associated with a molecular change at the ovine EDNRB locus, and to check if such a genetic alteration also occurs in other Cameroon sheep flocks. Sequence analysis revealed a deletion of about 110 kb on sheep chromosome 10, comprising the entire EDNRB gene, on both chromosomes in the two available hypopigmented lambs and on a single chromosome in the two dams and three other unaffected relatives. This micro-chromosomal deletion was also confirmed by quantitative real-time PCR and by fluorescence in situ hybridization. Genotyping of a total of 127 Cameroon sheep in 7 other flocks by duplex PCR did not identify additional carriers of the deletion. Although both hypopigmented lambs available for post-mortem examination had a considerably dilated cecum and remaining meconium, histopathological examination of intestinal samples showed morphologically normal ganglion cells in appropriate number and distribution. This is to our knowledge the first description of an ENDRB gene deletion and associated clinical signs in a mammalian species different from humans and rodents. In humans and rats it is postulated that the variable presence and severity of intestinal aganglionosis and other features in individuals with EDNRB deletion is due to a variable genetic background and multiple gene interactions. Therefore the here analyzed sheep are a valuable animal model to test these hypotheses in another species.
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Affiliation(s)
- Gesine Lühken
- Department of Animal Breeding and Genetics, Justus-Liebig University of Giessen, Giessen, Germany.
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Moore SW. Chromosomal and related Mendelian syndromes associated with Hirschsprung's disease. Pediatr Surg Int 2012; 28:1045-58. [PMID: 23001136 DOI: 10.1007/s00383-012-3175-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 08/28/2012] [Indexed: 12/12/2022]
Abstract
Hirschsprung's disease (HSCR) is a fairly frequent cause of intestinal obstruction in children. It is characterized as a sex-linked heterogonous disorder with variable severity and incomplete penetrance giving rise to a variable pattern of inheritance. Although Hirschsprung's disease occurs as an isolated phenotype in at least 70% of cases, it is not infrequently associated with a number of congenital abnormalities and associated syndromes, demonstrating a spectrum of congenital anomalies. Certain of these syndromic phenotypes have been linked to distinct genetic sites, indicating underlying genetic associations of the disease and probable gene-gene interaction, in its pathogenesis. These associations with HSCR include Down's syndrome and other chromosomal anomalies, Waardenburg syndrome and other Dominant sensorineural deafness, the Congenital Central Hypoventilation and Mowat-Wilson and other brain-related syndromes, as well as the MEN2 and other tumour associations. A number of other autosomal recessive syndromes include the Shah-Waardenburg, the Bardet-Biedl and Cartilage-hair hypoplasia, Goldberg-Shprintzen syndromes and other syndromes related to cholesterol and fat metabolism among others. The genetics of Hirschsprung's disease are highly complex with the majority of known genetic sites relating to the main susceptibility pathways (RET an EDNRB). Non-syndromic non-familial, short-segment HSCR appears to represent a non-Mendelian condition with variable expression and sex-dependent penetrance. Syndromic and familial forms, on the other hand, have complex patterns of inheritance and being reported as autosomal dominant, recessive and polygenic patterns of inheritance. The phenotypic variability and incomplete penetrance observed in Hirschsprung's disease could also be explained by the involvement of modifier genes, especially in its syndromic forms. In this review, we look at the chromosomal and Mendelian associations and their underlying signalling pathways, to obtain a better understanding of the pathogenetic mechanisms involved in developing aganglionosis of the distal bowel.
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Affiliation(s)
- S W Moore
- Division of Pediatric Surgery, Department of Surgical Sciences, Faculty of Health Sciences, University of Stellenbosch, P.O. Box 19063, Tygerberg, South Africa.
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Pan ZW, Li JC. Advances in molecular genetics of Hirschsprung's disease. Anat Rec (Hoboken) 2012; 295:1628-38. [PMID: 22815266 DOI: 10.1002/ar.22538] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 06/21/2012] [Indexed: 12/23/2022]
Abstract
Hirschsprung's disease (HSCR) is a developmental disorder of the enteric nervous system, which occurs due to the failure of neural crest cells to fully colonize the gut during embryonic development. It is characterized by the absence of the enteric ganglia in a variable length of the intestine. Substantial progress has been made in understanding the genetic basis of HSCR with the help of advanced genetic analysis techniques and animal models. More than 11 genes have been found to be involved in the pathogenesis of HSCR. The RET gene is the most important susceptibility gene involved in HSCR with both coding and non- coding sequence mutations. Due to phenotypic diversity and genetic complexity observed in HSCR, mutational analysis has limited practical value in genetic counseling and clinical practice. In this review, we discuss the progress that has been made in understanding the molecular genetics of HSCR and summarize the currently identified genes as well as interactions between pathways and gene-modifying loci in HSCR.
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Affiliation(s)
- Zhi-Wen Pan
- Institute of Cell Biology, Zhejiang University Medical School, 388 Yuhangtang Road, Hangzhou 310058, People's Republic of China
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Liu Y, Ye F, Yamada K, Tso JL, Zhang Y, Nguyen DH, Dong Q, Soto H, Choe J, Dembo A, Wheeler H, Eskin A, Schmid I, Yong WH, Mischel PS, Cloughesy TF, Kornblum HI, Nelson SF, Liau LM, Tso CL. Autocrine endothelin-3/endothelin receptor B signaling maintains cellular and molecular properties of glioblastoma stem cells. Mol Cancer Res 2011; 9:1668-85. [PMID: 22013079 DOI: 10.1158/1541-7786.mcr-10-0563] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Glioblastoma stem cells (GSC) express both radial glial cell and neural crest cell (NCC)-associated genes. We report that endothelin 3 (EDN3), an essential mitogen for NCC development and migration, is highly produced by GSCs. Serum-induced proliferative differentiation rapidly decreased EDN3 production and downregulated the expression of stemness-associated genes, and reciprocally, two glioblastoma markers, EDN1 and YKL-40 transcripts, were induced. Correspondingly, patient glioblastoma tissues express low levels of EDN3 mRNA and high levels of EDN1 and YKL-40 mRNA. Blocking EDN3/EDN receptor B (EDNRB) signaling by an EDNRB antagonist (BQ788), or EDN3 RNA interference (siRNA), leads to cell apoptosis and functional impairment of tumor sphere formation and cell spreading/migration in culture and loss of tumorigenic capacity in animals. Using exogenous EDN3 as the sole mitogen in culture does not support GSC propagation, but it can rescue GSCs from undergoing cell apoptosis. Molecular analysis by gene expression profiling revealed that most genes downregulated by EDN3/EDNRB blockade were those involved in cytoskeleton organization, pause of growth and differentiation, and DNA damage response, implicating the involvement of EDN3/EDNRB signaling in maintaining GSC migration, undifferentiation, and survival. These data suggest that autocrine EDN3/EDNRB signaling is essential for maintaining GSCs. Incorporating END3/EDNRB-targeted therapies into conventional cancer treatments may have clinical implication for the prevention of tumor recurrence.
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Affiliation(s)
- Yue Liu
- Department of Surgery/Surgical Oncology, University of California Los Angeles, Los Angeles, California 90095, USA
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Prasad MK, Reed X, Gorkin DU, Cronin JC, McAdow AR, Chain K, Hodonsky CJ, Jones EA, Svaren J, Antonellis A, Johnson SL, Loftus SK, Pavan WJ, McCallion AS. SOX10 directly modulates ERBB3 transcription via an intronic neural crest enhancer. BMC DEVELOPMENTAL BIOLOGY 2011; 11:40. [PMID: 21672228 PMCID: PMC3124416 DOI: 10.1186/1471-213x-11-40] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Accepted: 06/14/2011] [Indexed: 12/21/2022]
Abstract
Background The ERBB3 gene is essential for the proper development of the neural crest (NC) and its derivative populations such as Schwann cells. As with all cell fate decisions, transcriptional regulatory control plays a significant role in the progressive restriction and specification of NC derived lineages during development. However, little is known about the sequences mediating transcriptional regulation of ERBB3 or the factors that bind them. Results In this study we identified three transcriptional enhancers at the ERBB3 locus and evaluated their regulatory potential in vitro in NC-derived cell types and in vivo in transgenic zebrafish. One enhancer, termed ERBB3_MCS6, which lies within the first intron of ERBB3, directs the highest reporter expression in vitro and also demonstrates epigenetic marks consistent with enhancer activity. We identify a consensus SOX10 binding site within ERBB3_MCS6 and demonstrate, in vitro, its necessity and sufficiency for the activity of this enhancer. Additionally, we demonstrate that transcription from the endogenous Erbb3 locus is dependent on Sox10. Further we demonstrate in vitro that Sox10 physically interacts with that ERBB3_MCS6. Consistent with its in vitro activity, we also show that ERBB3_MCS6 drives reporter expression in NC cells and a subset of its derivative lineages in vivo in zebrafish in a manner consistent with erbb3b expression. We also demonstrate, using morpholino analysis, that Sox10 is necessary for ERBB3_MCS6 expression in vivo in zebrafish. Conclusions Taken collectively, our data suggest that ERBB3 may be directly regulated by SOX10, and that this control may in part be facilitated by ERBB3_MCS6.
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Affiliation(s)
- Megana K Prasad
- McKusick-Nathans Institute of Genetic Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
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Jabeen R, Babar ME, Ahmad J, Awan AR. Novel mutations of endothelin-B receptor gene in Pakistani patients with Waardenburg syndrome. Mol Biol Rep 2011; 39:785-8. [PMID: 21547364 DOI: 10.1007/s11033-011-0799-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2010] [Accepted: 04/29/2011] [Indexed: 01/30/2023]
Abstract
Mutations in EDNRB gene have been reported to cause Waardenburg-Shah syndrome (WS4) in humans. We investigated 17 patients with WS4 for identification of mutations in EDNRB gene using PCR and direct sequencing technique. Four genomic mutations were detected in four patients; a G to C transversion in codon 335 (S335C) in exon 5 and a transition of T to C in codon (S361L) in exon 5, a transition of A to G in codon 277 (L277L) in exon 4, a non coding transversion of T to A at -30 nucleotide position of exon 5. None of these mutations were found in controls. One of the patients harbored two novel mutations (S335C, S361L) in exon 5 and one in Intronic region (-30exon5 A>G). All of the mutations were homozygous and novel except the mutation observed in exon 4. In this study, we have identified 3 novel mutations in EDNRB gene associated with WS4 in Pakistani patients.
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Affiliation(s)
- Raheela Jabeen
- Institute of Biochemistry & Biotechnology, University of Veterinary and Animal Sciences, Outfall Road, CivilLines, Lahore, Pakistan
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Abstract
During the last decade, coat colouration in mammals has been investigated in numerous studies. Most of these studies addressing the genetics of coat colouration were on domesticated animals. In contrast to their wild ancestors, domesticated species are often characterized by a huge allelic variability of coat-colour-associated genes. This variability results from artificial selection accepting negative pleiotropic effects linked with certain coat-colour variants. Recent studies demonstrate that this selection for coat-colour phenotypes started at the beginning of domestication. Although to date more than 300 genetic loci and more than 150 identified coat-colour-associated genes have been discovered, which influence pigmentation in various ways, the genetic pathways influencing coat colouration are still only poorly described. On the one hand, similar coat colourations observed in different species can be the product of a few conserved genes. On the other hand, different genes can be responsible for highly similar coat colourations in different individuals of a species or in different species. Therefore, any phenotypic classification of coat colouration blurs underlying differences in the genetic basis of colour variants. In this review we focus on (i) the underlying causes that have resulted in the observed increase of colour variation in domesticated animals compared to their wild ancestors, and (ii) the current state of knowledge with regard to the molecular mechanisms of colouration, with a special emphasis on when and where the different coat-colour-associated genes act.
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Affiliation(s)
- Michael Cieslak
- Leibniz Institute for Zoo and Wildlife Research, Research Group of Evolutionary Genetics, Berlin, Germany
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36
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Expression and network analysis of genes related to melanocyte development in the Silky Fowl and White Leghorn embryos. Mol Biol Rep 2010; 38:1433-41. [PMID: 20848220 DOI: 10.1007/s11033-010-0248-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2009] [Accepted: 09/02/2010] [Indexed: 10/19/2022]
Abstract
Silky Fowl is a natural mutant with hyperpigmentation of various internal tissues. Although the mechanism of hyperpigmentation remains unclear, recent studies have shown that the abnormal migration of melanoblast and the absence of environmental barrier molecules are responsible for the hyperpigmentation in Silky Fowl. In this study, 13 genes related to melanocyte development were selected to detect expression changes between Silky Fowl and White Leghorn [including SRY-box 10 (Sox10), paired box (Pax3), stem cell factor (Scf), v-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene homolog (Kit), endothelin type-B receptor (Ednrb), endothelin 3 (Edn3), microphthalmia-associated transcription factor (Mitf), tyrosinase (Tyr), tyrosinase-related protein-1 (Trp1), tyrosinase-related protein-2 (Trp2), melanocortin-1 receptor (Mc1r), Agouti-related proteins (Agrp), and Proopiomelanocortin (Pomc)]. Transcript expression was detected in 11 stages from 2.5 to 15 days of incubation. In these embryonic periods, Mitf, Kit, Scf, and Agrp expressed earlier in Silky Fowl than in White Leghorn. Sox10, Ednrb, Kit, Mc1r, and Agrp, associating with the proliferation and differentiation of melanoblast, expressed higher (P < 0.05) in Silky Fowl than White Leghorn during 5-6 days of incubation. After day 8 of incubation, Mitf, Tyr, Trp1, Trp2, and Mc1r expressed higher (P < 0.05) in Silky Fowl than White Leghorn, while Agrp expressed higher (P < 0.05) in White Leghorn than Silky Fowl. Moreover, a regulatory network for melanocyte development was constructed based on the expression data. The network predicted novel regulatory relationships and confirmed relationships that have been reported. These results provide biological insight into the molecular mechanism of hyperpigmentation in the Silky Fowl. However, further investigation is needed to confirm these regulatory relationships.
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Pingault V, Ente D, Dastot-Le Moal F, Goossens M, Marlin S, Bondurand N. Review and update of mutations causing Waardenburg syndrome. Hum Mutat 2010; 31:391-406. [DOI: 10.1002/humu.21211] [Citation(s) in RCA: 401] [Impact Index Per Article: 28.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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38
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Saldana-Caboverde A, Kos L. Roles of endothelin signaling in melanocyte development and melanoma. Pigment Cell Melanoma Res 2010; 23:160-70. [PMID: 20128875 DOI: 10.1111/j.1755-148x.2010.00678.x] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Endothelin (Edn) signaling via the G-coupled, Edn receptor type B (Ednrb) is essential for the development of melanocytes from the neural crest (NC) and has been associated with melanoma progression. Edn3 plays varying roles during melanocyte development, promoting the proliferation and self-renewal of NC-derived multi- and bi-potential precursors as well as the survival, proliferation, differentiation and migration of committed melanocyte precursors. Melanocyte differentiation is achieved via the interaction of Ednrb and Kit signaling, with Ednrb being specifically required in the final differentiation step, rather than in the initial specification of melanocytic fate. Ednrb has also been implicated in the de-differentiation of mature melanocytes, a process that takes place during the malignant transformation of these cells. Ednrb was found to be upregulated in melanoma metastases and was shown to alter tumor-host interactions leading to melanoma progression. Antagonists to this receptor were shown to inhibit melanoma cell growth and increase the apoptotic rate of these cells, and to lead to disease stabilization in melanoma patients. Thus, Edn signaling inhibition may prove useful in the treatment of certain types of melanoma.
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Druckenbrod NR, Epstein ML. Age-dependent changes in the gut environment restrict the invasion of the hindgut by enteric neural progenitors. Development 2009; 136:3195-203. [PMID: 19700623 DOI: 10.1242/dev.031302] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The enteric nervous system (ENS) develops from neural crest cells (NCCs) that enter the foregut and hindgut to become enteric neural-crest-derived cells (ENCCs). When these cells of neural crest origin fail to colonize the terminal hindgut, this aganglionic region becomes non-functional and results in a condition in humans known as Hirschsprung's disease (HSCR). One of the genes associated with HSCR is endothelin receptor type B (Ednrb). To study the development of colonic aganglionosis we have utilized a novel knockout mouse (Ednrb(flex3/flex3)), in which the expression of a null Ednrb allele and YFP is confined to NCCs. We have identified two primary cellular defects related to defective EDNRB signaling. First, ENCC advance in Ednrb(flex3/flex3) embryos is delayed shortly after NCCs enter the gut. Apart from this early delay, Ednrb(flex3/flex3) ENCCs advance normally until reaching the proximal colon. Second, as Ednrb(flex3/flex3) ENCCs reach the colon at E14.5, they display migratory defects, including altered trajectories and reduced speed, that are not dependent on proliferation or differentiation. We constructed grafts to test the ability of donor ENCCs to invade a recipient piece of aganglionic colon. Our results indicate that the age of the recipient, and not the age or genotype of donor ENCCs, determines whether the colon is invaded. We identify changes in laminin expression that are associated with the failure of ENCCs to invade recipient tissue. Together, our data suggest that a defect in pre-enteric Ednrb(flex3/flex3) NCCs results in delayed colonic arrival, which, due to environment changes in the colon, is sufficient to cause aganglionosis.
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Affiliation(s)
- Noah R Druckenbrod
- Department of Anatomy and Neuroscience Training Program, University of Wisconsin School of Medicine and Public Health, Madison, WI 53705, USA
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Laranjeira C, Pachnis V. Enteric nervous system development: Recent progress and future challenges. Auton Neurosci 2009; 151:61-9. [PMID: 19783483 DOI: 10.1016/j.autneu.2009.09.001] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The enteric nervous system is the largest subdivision of the peripheral nervous system that plays a critical role in digestive functions. Despite considerable progress over the last 15 years in understanding the molecular and cellular mechanisms that control the development of the enteric nervous system, several questions remain unanswered. The present review will focus on recent progress on understanding the development of the mammalian enteric nervous system and highlight interesting directions of future research.
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Affiliation(s)
- Cátia Laranjeira
- MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London, United Kingdom.
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Abstract
Hirschsprung's disease (HSCR) is a developmental disorder characterized by the absence of ganglion cells in the lower digestive tract. Aganglionosis is attributed to a disorder of the enteric nervous system (ENS) whereby ganglion cells fail to innervate the lower gastrointestinal tract during embryonic development. HSCR is a complex disease that results from the interaction of several genes and manifests with low, sex-dependent penetrance and variability in the length of the aganglionic segment. The genetic complexity observed in HSCR can be conceptually understood in light of the molecular and cellular events that take place during the ENS development. DNA alterations in any of the genes involved in the ENS development may interfere with the colonization process, and represent a primary etiology for HSCR. This review will focus on the genes known to be involved in HSCR pathology, how they interact, and on how technology advances are being employed to uncover the pathological processes underlying this disease.
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Dessinioti C, Stratigos AJ, Rigopoulos D, Katsambas AD. A review of genetic disorders of hypopigmentation: lessons learned from the biology of melanocytes. Exp Dermatol 2009; 18:741-9. [PMID: 19555431 DOI: 10.1111/j.1600-0625.2009.00896.x] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Inherited diseases of pigmentation were among the first traits studied in humans because of their easy recognition. The discovery of genes that regulate melanocytic development and function and the identification of disease-causative mutations have greatly improved our understanding of the molecular basis of pigmentary genodermatoses and their underlying pathogenetic mechanisms. Pigmentation mutants can account for hypo-/amelanosis, with or without altered melanocyte number, resulting in different phenotypes, such as Waardenburg syndrome, piebaldism, Hermansky-Pudlak syndrome, Chediak-Higashi syndrome, oculocutaneous albinism and Griscelli syndrome. In this review, we summarize the basic concepts of melanocyte biology and discuss how molecular defects in melanocyte development and function can result in the development of hypopigmentary hereditary skin diseases.
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Affiliation(s)
- Clio Dessinioti
- Department of Dermatology, A. Sygros Hospital, University of Athens, Athens, Greece
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von Websky K, Heiden S, Pfab T, Hocher B. Pathophysiology of the endothelin system - lessons from genetically manipulated animal models. Eur J Med Res 2009; 14:1-6. [PMID: 19258203 PMCID: PMC3352198 DOI: 10.1186/2047-783x-14-1-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Shortly after discovery of ET-1 in 1988, the entire endothelin system was characterized. The endothelin system consists of the three peptides ET-1, ET-2 and ET-3, their G-protein-coupled receptors endothelin receptor A and B (ETRA and ETRB) and the two endothelin-converting enzymes (ECE-1 and ECE-2). Genetically modified animal models are an important tool in biomedical research. Here we describe the key findings obtained from genetically modified animal models either over-expressing compounds of the ET system or lacking these compounds (knockout mice). Results from the different transgenic and knockout models disclose that the ET system plays a major role in embryonic development. Two ET system-dependent neural crest-driven developmental pathways become obvious: one of them being an ET-1/ETAR axis, responsible for cardio-renal function and development as well as cranial development; the other seems to be an ET-3/ETBR mediated signalling pathway. Mutations within this axis are associated with disruptions in epidermal melanocytes and enteric neurons. These findings led to the discovery of similar findings in humans with Hirschsprung disease. In adult life the ET system is most important in the cardiovascular system and plays a role in fibrotic remodelling of the heart, lung and kidney as well as in the regulation of water and salt excretion.
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Affiliation(s)
- K von Websky
- Center for Cardiovascular Research/Department of Pharmacology and Toxicology, Charité, Hessische Str. 3-4, 10115 Berlin, Germany
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Kfoury T, Staiti G, Baujard C, Benhamou D. Pudendal nerve block by nerve stimulation in a child with Waardenburg disease. Paediatr Anaesth 2008; 18:1267-8. [PMID: 19076601 DOI: 10.1111/j.1460-9592.2008.02781.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Vamathevan JJ, Hasan S, Emes RD, Amrine-Madsen H, Rajagopalan D, Topp SD, Kumar V, Word M, Simmons MD, Foord SM, Sanseau P, Yang Z, Holbrook JD. The role of positive selection in determining the molecular cause of species differences in disease. BMC Evol Biol 2008; 8:273. [PMID: 18837980 PMCID: PMC2576240 DOI: 10.1186/1471-2148-8-273] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2008] [Accepted: 10/06/2008] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Related species, such as humans and chimpanzees, often experience the same disease with varying degrees of pathology, as seen in the cases of Alzheimer's disease, or differing symptomatology as in AIDS. Furthermore, certain diseases such as schizophrenia, epithelial cancers and autoimmune disorders are far more frequent in humans than in other species for reasons not associated with lifestyle. Genes that have undergone positive selection during species evolution are indicative of functional adaptations that drive species differences. Thus we investigate whether biomedical disease differences between species can be attributed to positively selected genes. RESULTS We identified genes that putatively underwent positive selection during the evolution of humans and four mammals which are often used to model human diseases (mouse, rat, chimpanzee and dog). We show that genes predicted to have been subject to positive selection pressure during human evolution are implicated in diseases such as epithelial cancers, schizophrenia, autoimmune diseases and Alzheimer's disease, all of which differ in prevalence and symptomatology between humans and their mammalian relatives. In agreement with previous studies, the chimpanzee lineage was found to have more genes under positive selection than any of the other lineages. In addition, we found new evidence to support the hypothesis that genes that have undergone positive selection tend to interact with each other. This is the first such evidence to be detected widely among mammalian genes and may be important in identifying molecular pathways causative of species differences. CONCLUSION Our dataset of genes predicted to have been subject to positive selection in five species serves as an informative resource that can be consulted prior to selecting appropriate animal models during drug target validation. We conclude that studying the evolution of functional and biomedical disease differences between species is an important way to gain insight into their molecular causes and may provide a method to predict when animal models do not mirror human biology.
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Affiliation(s)
- Jessica J Vamathevan
- Department of Biology, University College London, Darwin Bldg, Gower Street, London WC1E 6BT, UK
| | - Samiul Hasan
- Computational Biology Division, Molecular Discovery Research, GlaxoSmithKline R&D Ltd., 1250 South Collegeville Road, Collegeville, PA 19426, USA
| | - Richard D Emes
- Institute for Science and Technology in Medicine, Keele University, Thornburrow Drive, Hartshill, Stoke-on-Trent, ST4 7QB, UK
| | - Heather Amrine-Madsen
- Computational Biology Division, Molecular Discovery Research, GlaxoSmithKline R&D Ltd., 1250 South Collegeville Road, Collegeville, PA 19426, USA
| | - Dilip Rajagopalan
- Computational Biology Division, Molecular Discovery Research, GlaxoSmithKline R&D Ltd., 1250 South Collegeville Road, Collegeville, PA 19426, USA
| | - Simon D Topp
- Computational Biology Division, Molecular Discovery Research, GlaxoSmithKline R&D Ltd., 1250 South Collegeville Road, Collegeville, PA 19426, USA
| | - Vinod Kumar
- Computational Biology Division, Molecular Discovery Research, GlaxoSmithKline R&D Ltd., 1250 South Collegeville Road, Collegeville, PA 19426, USA
| | - Michael Word
- Computational Biology Division, Molecular Discovery Research, GlaxoSmithKline R&D Ltd., 1250 South Collegeville Road, Collegeville, PA 19426, USA
| | - Mark D Simmons
- Molecular Discovery Research Information Technology, GlaxoSmithKline R&D Ltd., 1250 South Collegeville Road, Collegeville, PA 19426, USA
| | - Steven M Foord
- Computational Biology Division, Molecular Discovery Research, GlaxoSmithKline R&D Ltd., 1250 South Collegeville Road, Collegeville, PA 19426, USA
| | - Philippe Sanseau
- Computational Biology Division, Molecular Discovery Research, GlaxoSmithKline R&D Ltd., 1250 South Collegeville Road, Collegeville, PA 19426, USA
| | - Ziheng Yang
- Department of Biology, University College London, Darwin Bldg, Gower Street, London WC1E 6BT, UK
| | - Joanna D Holbrook
- Computational Biology Division, Molecular Discovery Research, GlaxoSmithKline R&D Ltd., 1250 South Collegeville Road, Collegeville, PA 19426, USA
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Bondurand N, Dastot-Le Moal F, Stanchina L, Collot N, Baral V, Marlin S, Attie-Bitach T, Giurgea I, Skopinski L, Reardon W, Toutain A, Sarda P, Echaieb A, Lackmy-Port-Lis M, Touraine R, Amiel J, Goossens M, Pingault V. Deletions at the SOX10 gene locus cause Waardenburg syndrome types 2 and 4. Am J Hum Genet 2007; 81:1169-85. [PMID: 17999358 PMCID: PMC2276340 DOI: 10.1086/522090] [Citation(s) in RCA: 192] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2007] [Accepted: 08/01/2007] [Indexed: 12/14/2022] Open
Abstract
Waardenburg syndrome (WS) is an auditory-pigmentary disorder that exhibits varying combinations of sensorineural hearing loss and abnormal pigmentation of the hair and skin. Depending on additional symptoms, WS is classified into four subtypes, WS1-WS4. Absence of additional features characterizes WS2. The association of facial dysmorphic features defines WS1 and WS3, whereas the association with Hirschsprung disease (aganglionic megacolon) characterizes WS4, also called "Waardenburg-Hirschsprung disease." Mutations within the genes MITF and SNAI2 have been identified in WS2, whereas mutations of EDN3, EDNRB, and SOX10 have been observed in patients with WS4. However, not all cases are explained at the molecular level, which raises the possibility that other genes are involved or that some mutations within the known genes are not detected by commonly used genotyping methods. We used a combination of semiquantitative fluorescent multiplex polymerase chain reaction and fluorescent in situ hybridization to search for SOX10 heterozygous deletions. We describe the first characterization of SOX10 deletions in patients presenting with WS4. We also found SOX10 deletions in WS2 cases, making SOX10 a new gene of WS2. Interestingly, neurological phenotypes reminiscent of that observed in WS4 (PCWH syndrome [peripheral demyelinating neuropathy, central dysmyelinating leukodystrophy, WS, and Hirschsprung disease]) were observed in some WS2-affected patients with SOX10 deletions. This study further characterizes the molecular complexity and the close relationship that links the different subtypes of WS.
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Affiliation(s)
- Nadege Bondurand
- INSERM U841, Institut Mondor de Recherche Biomedicale, Département de Génétique, Université Paris 12, Paris, France.
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Matera I, Cockroft JL, Moran JL, Beier DR, Goldowitz D, Pavan WJ. A mouse model of Waardenburg syndrome type IV resulting from an ENU-induced mutation in endothelin 3. ACTA ACUST UNITED AC 2007; 20:210-5. [PMID: 17516928 DOI: 10.1111/j.1600-0749.2007.00371.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A line of mutant mice (114-CH19) exhibiting white spotting and preweaning lethality was identified during an N-ethyl-N-nitrosourea (ENU) mutagenesis screen. The trait segregated as a semidominant bellyspot with reduced penetrance. Homozygous mutant mice showed preweaning lethality, and exhibited white spotting over the majority of the body surface, with pigmented patches remaining around the pinnae, eyes and tail. Linkage analysis localized 114-CH19 on mouse chromosome 2, suggesting endothelin 3 (Edn3) as a candidate gene. Sequence analysis of Edn3 identified a G > A transversion that encodes an arginine to histidine substitution (R96H). This mutation is predicted to disrupt furin-mediated proteolytic cleavage of pro-endothelin that is necessary to form biologically active EDN3. This mutation is novel among human and mouse EDN3 mutants, is the first reported EDN3 ENU mutant, and is the second reported EDN3 point mutation. This study demonstrates the power of using ENU mutagenesis screens to generate new animal models of human disease, and expands the spectrum of EDN3 mutant alleles.
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Affiliation(s)
- Ivana Matera
- Genetic Disease Research Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20855, USA
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Miwa M, Inoue-Murayama M, Aoki H, Kunisada T, Hiragaki T, Mizutani M, Ito S. Endothelin receptor B2 (EDNRB2) is associated with the panda plumage colour mutation in Japanese quail. Anim Genet 2007; 38:103-8. [PMID: 17313575 DOI: 10.1111/j.1365-2052.2007.01568.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The panda mutant in Japanese quail (Coturnix japonica) displays spots of wild-type plumage on a white background and is controlled by an autosomal recessive allele (s). The dotted white is controlled by a third allele (s(dw)) of the s locus with s(dw)/s(dw) quail having less pigmentation than s/s quail. We mapped the s locus to the Japanese quail chromosome 4 (CJA04) in a previous study. The orthologous region of the chicken (Gallus gallus) genome includes endothelin receptor B2 (EDNRB2), an avian-specific paralog of endothelin receptor B (EDNRB). EDNRB mutations in mammals retard the migration of neural crest cells (NCCs), which results in a spotted coat colour and an enteric nervous defect. In the present study, we investigated the association between the s locus and EDNRB2 in Japanese quail. Sequence comparison among transcripts from livers of wild-type, panda and dotted white quail revealed a nucleotide substitution (c.995G>A) leading to a p.R332H amino acid change that was specific to panda, whereas no amino acid substitution was found in dotted white birds. The amino acid position 332 is located in the sixth transmembrane domain and is highly conserved in both avian and mammalian endothelin receptors. The A allele at nucleotide position 995 was specific to panda (s/s) birds among 10 strains, and was mapped to the same chromosomal region as the s locus. Quantitative RT-PCR revealed that EDNRB2 transcripts were reduced in both panda and dotted white mutants compared with wild-type. However, there was no difference between the early embryos of wild-type and panda with respect to the migration of NCCs. The genetic association of EDNRB2 with plumage colour in birds was found for the first time in this study.
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Affiliation(s)
- M Miwa
- Faculty of Applied Biological Sciences, Gifu University, Gifu 501-1193, Japan
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Lee S, Sha Q, Wu X, Calenda G, Peng J. Expression profiles of mouse Kell, XK, and XPLAC mRNA. J Histochem Cytochem 2006; 55:365-74. [PMID: 17189525 DOI: 10.1369/jhc.6a7126.2006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Kell and XK are related because in red cells they exist as a disulfide-bonded complex. Kell is an endothelin-3-converting enzyme, and XK is predicted to be a transporter. Absence of XK, which is accompanied by reduced Kell on red cells, results in acanthocytosis and late-onset forms of central nervous system and neuromuscular abnormalities that characterize the McLeod syndrome. In this study, expression of mouse XK, XPLAC, a homolog of XK, and Kell were compared by in situ hybridization histochemistry (ISHH) and RT-PCR. ISHH showed that Kell and XK are coexpressed in erythroid tissues. ISHH detected XK, but not Kell, mRNA in testis, but RT-PCR indicated that both Kell and XK are coexpressed. XK, but not Kell, was significantly expressed in brain, spinal cord, small intestine, heart, stomach, bladder, and kidney. ISHH did not detect XK in skeletal muscle but RT-PCR did. In brain, XK was predominantly expressed in neuronal rather than in supportive cells. By contrast, XPLAC was predominantly expressed in the thymus. Coexpression of Kell and XK in erythroid tissues and the different expressions in non-erythroid tissues suggest that XK may have a complementary hematological function with Kell and a separate role in other tissues.
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Affiliation(s)
- Soohee Lee
- The New York Blood Center, 310 East 67th Street, New York, NY 10021, USA.
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Bondurand N, Natarajan D, Barlow A, Thapar N, Pachnis V. Maintenance of mammalian enteric nervous system progenitors by SOX10 and endothelin 3 signalling. Development 2006; 133:2075-86. [PMID: 16624853 DOI: 10.1242/dev.02375] [Citation(s) in RCA: 119] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The transcriptional regulator SOX10 and the signalling molecule endothelin 3 have important roles in the development of the mammalian enteric nervous system (ENS). Using a clonal cell culture system, we show that SOX10 inhibits overt neuronal and glial differentiation of multilineage ENS progenitor cells (EPCs), without interfering with their neurogenic commitment. We also demonstrate that endothelin 3 inhibits reversibly the commitment and differentiation of EPCs along the neurogenic and gliogenic lineages, suggesting a role for this factor in the maintenance of multilineage ENS progenitors. Consistent with such a role, the proportion of Sox10-expressing progenitors in the total population of enteric neural crest cells is reduced in the gut of endothelin 3-deficient embryos. This reduction may be related to the requirement of endothelin signalling for the proliferation of ENS progenitors. The dependence of ENS progenitors on endothelin 3 is more pronounced at the migratory front of enteric neural crest cells, which is associated with relatively high levels of endothelin 3 mRNA. Our findings indicate that SOX10 and endothelin 3 have a crucial role in the maintenance of multilineage enteric nervous system progenitors.
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Affiliation(s)
- Nadege Bondurand
- Division of Molecular Neurobiology, MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK
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