1
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Cerrizuela S, Vega-Lopez GA, Méndez-Maldonado K, Velasco I, Aybar MJ. The crucial role of model systems in understanding the complexity of cell signaling in human neurocristopathies. WIREs Mech Dis 2022; 14:e1537. [PMID: 35023327 DOI: 10.1002/wsbm.1537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 08/26/2021] [Accepted: 08/30/2021] [Indexed: 11/07/2022]
Abstract
Animal models are useful to study the molecular, cellular, and morphogenetic mechanisms underlying normal and pathological development. Cell-based study models have emerged as an alternative approach to study many aspects of human embryonic development and disease. The neural crest (NC) is a transient, multipotent, and migratory embryonic cell population that generates a diverse group of cell types that arises during vertebrate development. The abnormal formation or development of the NC results in neurocristopathies (NCPs), which are characterized by a broad spectrum of functional and morphological alterations. The impaired molecular mechanisms that give rise to these multiphenotypic diseases are not entirely clear yet. This fact, added to the high incidence of these disorders in the newborn population, has led to the development of systematic approaches for their understanding. In this article, we have systematically reviewed the ways in which experimentation with different animal and cell model systems has improved our knowledge of NCPs, and how these advances might contribute to the development of better diagnostic and therapeutic tools for the treatment of these pathologies. This article is categorized under: Congenital Diseases > Genetics/Genomics/Epigenetics Congenital Diseases > Stem Cells and Development Congenital Diseases > Molecular and Cellular Physiology Neurological Diseases > Genetics/Genomics/Epigenetics.
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Affiliation(s)
- Santiago Cerrizuela
- Division of Molecular Neurobiology, German Cancer Research Center (DKFZ), Heidelberg, Germany.,Instituto Superior de Investigaciones Biológicas (INSIBIO, CONICET-UNT), Tucumán, Argentina
| | - Guillermo A Vega-Lopez
- Instituto Superior de Investigaciones Biológicas (INSIBIO, CONICET-UNT), Tucumán, Argentina.,Instituto de Biología "Dr. Francisco D. Barbieri", Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Tucumán, Argentina
| | - Karla Méndez-Maldonado
- Instituto de Fisiología Celular - Neurociencias, Universidad Nacional Autónoma de México, Ciudad de México, Mexico.,Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Iván Velasco
- Instituto de Fisiología Celular - Neurociencias, Universidad Nacional Autónoma de México, Ciudad de México, Mexico.,Laboratorio de Reprogramación Celular del Instituto de Fisiología Celular, UNAM en el Instituto Nacional de Neurología y Neurocirugía "Manuel Velasco Suárez", Ciudad de México, Mexico
| | - Manuel J Aybar
- Instituto Superior de Investigaciones Biológicas (INSIBIO, CONICET-UNT), Tucumán, Argentina.,Instituto de Biología "Dr. Francisco D. Barbieri", Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Tucumán, Argentina
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2
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Henkel J, Saif R, Jagannathan V, Schmocker C, Zeindler F, Bangerter E, Herren U, Posantzis D, Bulut Z, Ammann P, Drögemüller C, Flury C, Leeb T. Selection signatures in goats reveal copy number variants underlying breed-defining coat color phenotypes. PLoS Genet 2019; 15:e1008536. [PMID: 31841508 PMCID: PMC6936872 DOI: 10.1371/journal.pgen.1008536] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 12/30/2019] [Accepted: 11/23/2019] [Indexed: 12/16/2022] Open
Abstract
Domestication and human selection have formed diverse goat breeds with characteristic phenotypes. This process correlated with the fixation of causative genetic variants controlling breed-specific traits within regions of reduced genetic diversity, so called selection signatures or selective sweeps. Using whole genome sequencing of DNA pools (pool-seq) from 20 genetically diverse modern goat breeds and bezoars, we identified 2,239 putative selection signatures. In two Pakistani goat breeds, Pak Angora and Barbari, we found selection signatures in a region harboring KIT, a gene involved in melanoblast development, migration, and survival. The search for candidate causative variants responsible for these selective sweeps revealed two different copy number variants (CNVs) downstream of KIT that were exclusively present in white Pak Angora and white-spotted Barbari goats. Several Swiss goat breeds selected for specific coat colors showed selection signatures at the ASIP locus encoding the agouti signaling protein. Analysis of these selective sweeps revealed four different CNVs associated with the white or tan (AWt), Swiss markings (Asm), badgerface (Ab), and the newly proposed peacock (Apc) allele. RNA-seq analyses on skin samples from goats with the different CNV alleles suggest that the identified structural variants lead to an altered expression of ASIP between eumelanistic and pheomelanistic body areas. Our study yields novel insights into the genetic control of pigmentation by identifying six functionally relevant CNVs. It illustrates how structural changes of the genome have contributed to phenotypic evolution in domestic goats. Domestic animals have been selected for hundreds or sometimes even thousands of years for traits that were appreciated by their human owners. This process correlated with the fixation of causative genetic variants controlling breed-specific traits within regions of reduced genetic diversity, so called selection signatures or selective sweeps. We conducted a comprehensive screen for selection signatures in 20 phenotypically and genetically diverse modern goat breeds and identified a total of 2,239 putative selection signatures in our dataset. Follow-up experiments on selection signatures harboring known candidate genes for coat color revealed six different copy number variants (CNVs). Two of these CNVs were located in the 3’-flanking region of KIT and associated with a completely white coat color phenotype in Pak Angora goats and a white-spotted coat color phenotype in Barbari goats, respectively. The other four CNVs were located at the ASIP locus. They were associated with four different types of coat color patterning in seven Swiss goat breeds. Their functional effect is mediated by region-specific quantitative changes in ASIP mRNA expression. Our study illustrates how structural changes of the genome have contributed to phenotypic evolution in domestic goats.
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Affiliation(s)
- Jan Henkel
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, University of Bern, Bern, Switzerland
| | - Rashid Saif
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- Institute of Biotechnology, Gulab Devi Educational Complex, Lahore, Pakistan
| | - Vidhya Jagannathan
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, University of Bern, Bern, Switzerland
| | - Corinne Schmocker
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Flurina Zeindler
- School of Agricultural, Forest and Food Sciences, Bern University of Applied Sciences, Zollikofen, Switzerland
| | | | - Ursula Herren
- Swiss Goat Breeding Association, Zollikofen, Switzerland
| | | | - Zafer Bulut
- Department of Biochemistry, Faculty of Veterinary Medicine, Selcuk University, Konya, Turkey
| | | | - Cord Drögemüller
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, University of Bern, Bern, Switzerland
| | - Christine Flury
- School of Agricultural, Forest and Food Sciences, Bern University of Applied Sciences, Zollikofen, Switzerland
| | - Tosso Leeb
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, University of Bern, Bern, Switzerland
- * E-mail:
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3
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Mattucci F, Galaverni M, Lyons LA, Alves PC, Randi E, Velli E, Pagani L, Caniglia R. Genomic approaches to identify hybrids and estimate admixture times in European wildcat populations. Sci Rep 2019; 9:11612. [PMID: 31406125 PMCID: PMC6691104 DOI: 10.1038/s41598-019-48002-w] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 07/25/2019] [Indexed: 12/22/2022] Open
Abstract
The survival of indigenous European wildcat (Felis silvestris silvestris) populations can be locally threatened by introgressive hybridization with free-ranging domestic cats. Identifying pure wildcats and investigating the ancestry of admixed individuals becomes thus a conservation priority. We analyzed 63k cat Single Nucleotide Polymorphisms (SNPs) with multivariate, Bayesian and gene-search tools to better evaluate admixture levels between domestic and wild cats collected in Europe, timing and ancestry proportions of their hybrids and backcrosses, and track the origin (wild or domestic) of the genomic blocks carried by admixed cats, also looking for possible deviations from neutrality in their inheritance patterns. Small domestic ancestry blocks were detected in the genomes of most admixed cats, which likely originated from hybridization events occurring from 6 to 22 generations in the past. We identified about 1,900 outlier coding genes with excess of wild or domestic ancestry compared to random expectations in the admixed individuals. More than 600 outlier genes were significantly enriched for Gene Ontology (GO) categories mainly related to social behavior, functional and metabolic adaptive processes (wild-like genes), involved in cognition and neural crest development (domestic-like genes), or associated with immune system functions and lipid metabolism (parental-like genes). These kinds of genomic ancestry analyses could be reliably applied to unravel the admixture dynamics in European wildcats, as well as in other hybridizing populations, in order to design more efficient conservation plans.
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Affiliation(s)
- Federica Mattucci
- Area per la Genetica della Conservazione (BIO-CGE), Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA), Ozzano dell'Emilia, Italy.
| | | | - Leslie A Lyons
- Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, USA
| | - Paulo C Alves
- Centro de Investigação em Biodiversidade e Recursos Genéticos (CIBIO), InBio - Laboratório Associado, Campus Agrário de Vairão, Vairão, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
- Wildlife Biology Program, Department of Ecosystem and Conservation Sciences, University of Montana, Missoula, USA
| | - Ettore Randi
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Bologna, Italy
- Department of Chemistry and Bioscience, Faculty of Engineering and Science, University of Aalborg, Aalborg, Denmark
| | - Edoardo Velli
- Area per la Genetica della Conservazione (BIO-CGE), Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA), Ozzano dell'Emilia, Italy
| | - Luca Pagani
- Dipartimento di Biologia, Università degli Studi di Padova, Padua, Italy
- Estonian Biocentre, Institute of Genomics, University of Tartu, Tartu, Estonia
| | - Romolo Caniglia
- Area per la Genetica della Conservazione (BIO-CGE), Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA), Ozzano dell'Emilia, Italy
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4
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Vandamme N, Berx G. From neural crest cells to melanocytes: cellular plasticity during development and beyond. Cell Mol Life Sci 2019; 76:1919-1934. [PMID: 30830237 PMCID: PMC11105195 DOI: 10.1007/s00018-019-03049-w] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 01/25/2019] [Accepted: 02/18/2019] [Indexed: 01/07/2023]
Abstract
Here, we review melanocyte development and how the embryonic melanoblast, although specified to become a melanocyte, is prone to cellular plasticity and is not fully committed to the melanocyte lineage. Even fully differentiated and pigment-producing melanocytes do not always have a stable phenotype. The gradual lineage restriction of neural crest cells toward the melanocyte lineage is determined by both cell-intrinsic and extracellular signals in which differentiation and pathfinding ability reciprocally influence each other. These signals are leveraged by subtle differences in timing and axial positioning. The most extensively studied migration route is the dorsolateral path between the dermomyotome and the prospective epidermis, restricted to melanoblasts. In addition, the embryonic origin of the skin dermis through which neural crest derivatives migrate may also affect the segregation between melanogenic and neurogenic cells in embryos. It is widely accepted that, irrespective of the model organism studied, the immediate precursor of both melanoblast and neurogenic populations is a glial-melanogenic bipotent progenitor. Upon exposure to different conditions, melanoblasts may differentiate into other neural crest-derived lineages such as neuronal cells and vice versa. Key factors that regulate melanoblast migration and patterning will regulate melanocyte homeostasis during different stages of hair cycling in postnatal hair follicles.
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Affiliation(s)
- Niels Vandamme
- Molecular and Cellular Oncology Laboratory, Department of Biomedical Molecular Biology, Ghent University, Technologiepark-Zwijnaarde 71, 9052, Ghent, Belgium
- DAMBI, VIB Center for Inflammation Research, Ghent, Belgium
- Department of Applied Mathematics, Computer Science and Statistics, Ghent University, Ghent, Belgium
- Cancer Research Institute Ghent (CRIG), Ghent, Belgium
| | - Geert Berx
- Molecular and Cellular Oncology Laboratory, Department of Biomedical Molecular Biology, Ghent University, Technologiepark-Zwijnaarde 71, 9052, Ghent, Belgium.
- Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
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5
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Kinsler VA, Larue L. The patterns of birthmarks suggest a novel population of melanocyte precursors arising around the time of gastrulation. Pigment Cell Melanoma Res 2017; 31:95-109. [PMID: 28940934 PMCID: PMC5765478 DOI: 10.1111/pcmr.12645] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Accepted: 09/18/2017] [Indexed: 12/17/2022]
Abstract
Systematic work in the mouse and chicken has mapped out two neural crest-derived pathways of melanocyte precursor migration. With these in mind, this study reappraises the patterns of congenital pigmentary disorders in humans and identifies three recurrent patterns consistent across genetically different diseases. Only two of these are seen in diseases known to be melanocyte cell-autonomous. The segmental pattern correlates well with the classical dorsolateral population from animal studies, demonstrating respect of the midline, cranio-caudal axial mixing, unilateral migration and involvement of key epidermally derived structures. Importantly however, the melanocyte precursors responsible for the non-segmental pattern, which demonstrates circular, bilateral migration centred on the midline, and not involving key epidermally derived structures, have not been identified previously. We propose that this population originates around the time of gastrulation, most likely within the mesoderm, and ultimately resides within the dermis. Whether it contributes to mature melanocytes in non-disease states is not known; however, parallels with the patterns of acquired vitiligo would suggest that it does. The third pattern, hypo- or hyperpigmented fine and whorled Blaschko's lines, is proposed to be non-cell-autonomous.
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Affiliation(s)
- Veronica A Kinsler
- Genetics and Genomic Medicine, UCL Institute of Child Health, London, UK.,Paediatric Dermatology, Great Ormond Street Hospital for Children, NHS Foundation Trust, London, UK
| | - Lionel Larue
- Institut Curie, INSERM U1021, Normal and Pathological Development of Melanocytes, PSL Research University, Orsay, France.,Univ Paris-Sud, Univ Paris-Saclay, CNRS UMR 3347, Orsay, France.,Equipe Labellisée Ligue Contre le Cancer, Orsay, France
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6
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van Rooijen E, Fazio M, Zon LI. From fish bowl to bedside: The power of zebrafish to unravel melanoma pathogenesis and discover new therapeutics. Pigment Cell Melanoma Res 2017; 30:402-412. [PMID: 28379616 PMCID: PMC6038924 DOI: 10.1111/pcmr.12592] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 03/22/2017] [Indexed: 12/28/2022]
Abstract
Melanoma is the most aggressive and deadliest form of skin cancer. A detailed knowledge of the cellular, molecular, and genetic events underlying melanoma progression is highly relevant to diagnosis, prognosis and risk stratification, and the development of new therapies. In the last decade, zebrafish have emerged as a valuable model system for the study of melanoma. Pathway conservation, coupled with the availability of robust genetic, transgenic, and chemical tools, has made the zebrafish a powerful model for identifying novel disease genes, visualizing cancer initiation, interrogating tumor-microenvironment interactions, and discovering new therapeutics that regulate melanocyte and melanoma development. In this review, we will give an overview of these studies, and highlight recent advancements that will help unravel melanoma pathogenesis and impact human disease.
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Affiliation(s)
- Ellen van Rooijen
- Stem Cell Program and Division of Hematology/Oncology, Boston Children’s Hospital and Dana Farber Cancer Institute, Howard Hughes Medical Institute, Harvard Stem Cell Institute, Harvard Medical School, Boston, MA, USA
| | - Maurizio Fazio
- Stem Cell Program and Division of Hematology/Oncology, Boston Children’s Hospital and Dana Farber Cancer Institute, Howard Hughes Medical Institute, Harvard Stem Cell Institute, Harvard Medical School, Boston, MA, USA
- PhD program in Biological and Biomedical Sciences, Harvard University, Boston, MA, USA
| | - Leonard I. Zon
- Stem Cell Program and Division of Hematology/Oncology, Boston Children’s Hospital and Dana Farber Cancer Institute, Howard Hughes Medical Institute, Harvard Stem Cell Institute, Harvard Medical School, Boston, MA, USA
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7
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Domyan ET, Shapiro MD. Pigeonetics takes flight: Evolution, development, and genetics of intraspecific variation. Dev Biol 2016; 427:241-250. [PMID: 27847323 DOI: 10.1016/j.ydbio.2016.11.008] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2016] [Revised: 10/28/2016] [Accepted: 11/10/2016] [Indexed: 11/26/2022]
Abstract
Intensive artificial selection over thousands of years has produced hundreds of varieties of domestic pigeon. As Charles Darwin observed, the morphological differences among breeds can rise to the magnitude of variation typically observed among different species. Nevertheless, different pigeon varieties are interfertile, thereby enabling forward genetic and genomic approaches to identify genes that underlie derived traits. Building on classical genetic studies of pigeon variation, recent molecular investigations find a spectrum of coding and regulatory alleles controlling derived traits, including plumage color, feather growth polarity, and limb identity. Developmental and genetic analyses of pigeons are revealing the molecular basis of variation in a classic example of extreme intraspecific diversity, and have the potential to nominate genes that control variation among other birds and vertebrates in general.
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Affiliation(s)
- Eric T Domyan
- Department of Biology, Utah Valley University, Orem, UT, United States.
| | - Michael D Shapiro
- Department of Biology, University of Utah, Salt Lake City, UT, United States.
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8
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Zazo Seco C, Serrão de Castro L, van Nierop J, Morín M, Jhangiani S, Verver E, Schraders M, Maiwald N, Wesdorp M, Venselaar H, Spruijt L, Oostrik J, Schoots J, van Reeuwijk J, Lelieveld S, Huygen P, Insenser M, Admiraal R, Pennings R, Hoefsloot L, Arias-Vásquez A, de Ligt J, Yntema H, Jansen J, Muzny D, Huls G, van Rossum M, Lupski J, Moreno-Pelayo M, Kunst H, Kremer H, Kremer H. Allelic Mutations of KITLG, Encoding KIT Ligand, Cause Asymmetric and Unilateral Hearing Loss and Waardenburg Syndrome Type 2. Am J Hum Genet 2015; 97:647-60. [PMID: 26522471 DOI: 10.1016/j.ajhg.2015.09.011] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 09/24/2015] [Indexed: 01/04/2023] Open
Abstract
Linkage analysis combined with whole-exome sequencing in a large family with congenital and stable non-syndromic unilateral and asymmetric hearing loss (NS-UHL/AHL) revealed a heterozygous truncating mutation, c.286_303delinsT (p.Ser96Ter), in KITLG. This mutation co-segregated with NS-UHL/AHL as a dominant trait with reduced penetrance. By screening a panel of probands with NS-UHL/AHL, we found an additional mutation, c.200_202del (p.His67_Cys68delinsArg). In vitro studies revealed that the p.His67_Cys68delinsArg transmembrane isoform of KITLG is not detectable at the cell membrane, supporting pathogenicity. KITLG encodes a ligand for the KIT receptor. Also, KITLG-KIT signaling and MITF are suggested to mutually interact in melanocyte development. Because mutations in MITF are causative of Waardenburg syndrome type 2 (WS2), we screened KITLG in suspected WS2-affected probands. A heterozygous missense mutation, c.310C>G (p.Leu104Val), that segregated with WS2 was identified in a small family. In vitro studies revealed that the p.Leu104Val transmembrane isoform of KITLG is located at the cell membrane, as is wild-type KITLG. However, in culture media of transfected cells, the p.Leu104Val soluble isoform of KITLG was reduced, and no soluble p.His67_Cys68delinsArg and p.Ser96Ter KITLG could be detected. These data suggest that mutations in KITLG associated with NS-UHL/AHL have a loss-of-function effect. We speculate that the mechanism of the mutation underlying WS2 and leading to membrane incorporation and reduced secretion of KITLG occurs via a dominant-negative or gain-of-function effect. Our study unveils different phenotypes associated with KITLG, previously associated with pigmentation abnormalities, and will thereby improve the genetic counseling given to individuals with KITLG variants.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Hannie Kremer
- Hearing & Genes Division, Department of Otorhinolaryngology, Radboud University Medical Center, Nijmegen 6525GA, the Netherlands; The Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen 6525GA, the Netherlands; Department of Human Genetics, Radboud University Medical Center, Nijmegen 6525GA, the Netherlands.
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9
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Pancholi N, Taneja P. Intraoral hyperpigmentation due to imatinib mesylate. A review of the literature. ACTA ACUST UNITED AC 2015. [DOI: 10.1111/ors.12194] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Nilesh Pancholi
- Department of Oral Surgery; Birmingham Dental Hospital; St Chad's Queensway; Birmingham UK
| | - Pankaj Taneja
- Department of Oral Surgery; Birmingham Dental Hospital; St Chad's Queensway; Birmingham UK
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10
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Wang X, Li K, Liu L, Shi Q, Song P, Jian Z, Guo S, Wang G, Li C, Gao T. AHR promoter variant modulates its transcription and downstream effectors by allele-specific AHR-SP1 interaction functioning as a genetic marker for vitiligo. Sci Rep 2015; 5:13542. [PMID: 26370050 PMCID: PMC4570213 DOI: 10.1038/srep13542] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 07/30/2015] [Indexed: 12/28/2022] Open
Abstract
Vitiligo is an acquired depigmentation disorder largely caused by defective melanocyte- or autoimmunity-induced melanocyte destruction. The aryl hydrocarbon receptor (AHR) is essential for melanocyte homeostasis and immune process, and abnormal AHR was observed in vitiligo. We previously identified the T allele of AHR -129C > T variant as a protective factor against vitiligo. However, biological characterization underlying such effects is not fully certain, further validation by mechanistic research is warranted and was conducted in the present study. We showed that -129T allele promoted AHR transcriptional activity through facilitating its interaction with SP1 transcription factor (SP1) compared with -129C allele. We subsequently found reduced peripheral AHR and SP1 transcript expressions in vitiligo and a negative correlation of AHR level with disease duration. We also investigated AHR-related cytokines and observed increased serum TNF-α concentration and diminished serum levels of IL-10 and TGF-β1 in vitiligo. Further genetic analysis showed that -129T carriers possessed higher levels of AHR and IL-10 than -129C carriers. Therefore, our study indicates that the modulation of AHR transcription by a promoter variant has a profound influence on vitiligo, not only advancing our understanding on AHR function but also providing novel insight into the pathogenesis of degenerative or autoimmune diseases including vitiligo.
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Affiliation(s)
- Xiaowen Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Kai Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Ling Liu
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Qiong Shi
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Pu Song
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Zhe Jian
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Sen Guo
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Gang Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Chunying Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Tianwen Gao
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
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11
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Abstract
Melanocyte development provides an excellent model for studying more complex developmental processes. Melanocytes have an apparently simple aetiology, differentiating from the neural crest and migrating through the developing embryo to specific locations within the skin and hair follicles, and to other sites in the body. The study of pigmentation mutations in the mouse provided the initial key to identifying the genes and proteins involved in melanocyte development. In addition, work on chicken has provided important embryological and molecular insights, whereas studies in zebrafish have allowed live imaging as well as genetic and transgenic approaches. This cross-species approach is powerful and, as we review here, has resulted in a detailed understanding of melanocyte development and differentiation, melanocyte stem cells and the role of the melanocyte lineage in diseases such as melanoma. Summary: This Review discusses melanocyte development and differentiation, melanocyte stem cells, and the role of the melanocyte lineage in diseases such as melanoma.
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Affiliation(s)
| | - Ian J Jackson
- MRC Human Genetics Unit and University of Edinburgh Cancer Research UK Cancer Centre, MRC Institute for Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XU, UK
| | - E Elizabeth Patton
- MRC Human Genetics Unit and Roslin Institute, University of Edinburgh, Edinburgh EH25 9RG, UK
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12
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Reshetnyak AV, Opatowsky Y, Boggon TJ, Folta-Stogniew E, Tome F, Lax I, Schlessinger J. The strength and cooperativity of KIT ectodomain contacts determine normal ligand-dependent stimulation or oncogenic activation in cancer. Mol Cell 2014; 57:191-201. [PMID: 25544564 DOI: 10.1016/j.molcel.2014.11.021] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 10/14/2014] [Accepted: 11/18/2014] [Indexed: 12/22/2022]
Abstract
The receptor tyrosine kinase KIT plays an important role in development of germ cells, hematopoietic cells, and interstitial pacemaker cells. Oncogenic KIT mutations play an important "driver" role in gastrointestinal stromal tumors, acute myeloid leukemias, and melanoma, among other cancers. Here we describe the crystal structure of a recurring somatic oncogenic mutation located in the C-terminal Ig-like domain (D5) of the ectodomain, rendering KIT tyrosine kinase activity constitutively activated. The structural analysis, together with biochemical and biophysical experiments and detailed analyses of the activities of a variety of oncogenic KIT mutations, reveals that the strength of homotypic contacts and the cooperativity in the action of D4D5 regions determines whether KIT is normally regulated or constitutively activated in cancers. We propose that cooperative interactions mediated by multiple weak homotypic contacts between receptor molecules are responsible for regulating normal ligand-dependent or oncogenic RTK activation via a "zipper-like" mechanism for receptor activation.
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Affiliation(s)
- Andrey V Reshetnyak
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Yarden Opatowsky
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Titus J Boggon
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Ewa Folta-Stogniew
- The Biophysical Resource, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Francisco Tome
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Irit Lax
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA.
| | - Joseph Schlessinger
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA.
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13
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Hemati P, du Souich C, Boerkoel CF. 4q12-4q21.21 deletion genotype-phenotype correlation and the absence of piebaldism in presence of KIT haploinsufficiency. Am J Med Genet A 2014; 167A:231-7. [PMID: 25355368 DOI: 10.1002/ajmg.a.36821] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 09/11/2014] [Accepted: 09/17/2014] [Indexed: 11/09/2022]
Abstract
Chromosome 4q deletion syndrome is a rare intellectual disability disorder caused by a variety of non-recurrent deletions of 4q. We describe the evolution of the phenotypic features of a female patient with a previously unreported deletion of 4q12-4q21.21 (hg 18; 54,711,575-79,601,919). By review reported individuals with interstitial deletions extending telomeric from 4q12 have syndromic intellectual disability with variable piebaldism. We expand the phenotype to include dolichocephaly, pectus excavatum, hip dysplasia, pes planus, myopia, lens opacities, and an absence of spoken language but not of communication through sign. The proposita also did not have piebaldism suggesting again that piebaldism arises from a mechanism more complex than simple haploinsufficiency of KIT. Comparing deletions among affected individuals localizes the critical interval within 4q12-4q13.1, although the absence of molecular boundaries for nearly all reported cases precludes precise delineation and genotype-phenotype correlation.
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Affiliation(s)
- Parisa Hemati
- Child and Family Research Institute, Vancouver, Canada; Department of Medical Genetics, University of British Columbia, Vancouver, Canada
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14
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Xu XH, Ma L, Weng L, Xing H. A novel mutation of KIT gene results in piebaldism in a Chinese family. J Eur Acad Dermatol Venereol 2014; 30:336-8. [PMID: 25199540 DOI: 10.1111/jdv.12738] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- X-H Xu
- Department of Dermatology, Beijing Children's Hospital, Capital Medical University, Beijing, China
| | - L Ma
- Department of Dermatology, Beijing Children's Hospital, Capital Medical University, Beijing, China
| | - L Weng
- Department of Dermatology, Beijing Children's Hospital, Capital Medical University, Beijing, China
| | - H Xing
- Department of Dermatology, Beijing Children's Hospital, Capital Medical University, Beijing, China
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15
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David VA, Menotti-Raymond M, Wallace AC, Roelke M, Kehler J, Leighty R, Eizirik E, Hannah SS, Nelson G, Schäffer AA, Connelly CJ, O'Brien SJ, Ryugo DK. Endogenous retrovirus insertion in the KIT oncogene determines white and white spotting in domestic cats. G3 (BETHESDA, MD.) 2014; 4:1881-91. [PMID: 25085922 PMCID: PMC4199695 DOI: 10.1534/g3.114.013425] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Accepted: 07/26/2014] [Indexed: 01/06/2023]
Abstract
The Dominant White locus (W) in the domestic cat demonstrates pleiotropic effects exhibiting complete penetrance for absence of coat pigmentation and incomplete penetrance for deafness and iris hypopigmentation. We performed linkage analysis using a pedigree segregating White to identify KIT (Chr. B1) as the feline W locus. Segregation and sequence analysis of the KIT gene in two pedigrees (P1 and P2) revealed the remarkable retrotransposition and evolution of a feline endogenous retrovirus (FERV1) as responsible for two distinct phenotypes of the W locus, Dominant White, and white spotting. A full-length (7125 bp) FERV1 element is associated with white spotting, whereas a FERV1 long terminal repeat (LTR) is associated with all Dominant White individuals. For purposes of statistical analysis, the alternatives of wild-type sequence, FERV1 element, and LTR-only define a triallelic marker. Taking into account pedigree relationships, deafness is genetically linked and associated with this marker; estimated P values for association are in the range of 0.007 to 0.10. The retrotransposition interrupts a DNAase I hypersensitive site in KIT intron 1 that is highly conserved across mammals and was previously demonstrated to regulate temporal and tissue-specific expression of KIT in murine hematopoietic and melanocytic cells. A large-population genetic survey of cats (n = 270), representing 30 cat breeds, supports our findings and demonstrates statistical significance of the FERV1 LTR and full-length element with Dominant White/blue iris (P < 0.0001) and white spotting (P < 0.0001), respectively.
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Affiliation(s)
- Victor A David
- Laboratory of Genomic Diversity, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702
| | - Marilyn Menotti-Raymond
- Laboratory of Genomic Diversity, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702
| | - Andrea Coots Wallace
- Laboratory of Genomic Diversity, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702
| | - Melody Roelke
- Leidos Biomedical Research Frederick National Laboratory for Cancer Research, Frederick, Maryland 21702 Labooratory Animal Sciences Program (LASP) Bethesda Leidos Biomedical Research, Bethesda, Maryland 20892-2471
| | - James Kehler
- Laboratory of Cell and Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20814
| | - Robert Leighty
- Data Management Services, Inc., National Cancer Institute-Frederick, Frederick, Maryland 21702
| | - Eduardo Eizirik
- Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul 90619-900, Brazil Instituto Pró-Carnívoros, Atibaia, Sao Paulo 12945-010, Brazil
| | | | - George Nelson
- BSP-CCR Genetics Core, Frederick National Laboratory, Frederick, Maryland 21702
| | - Alejandro A Schäffer
- National Center for Biotechnology Information, National Institutes of Health, Bethesda, Maryland 20894
| | | | - Stephen J O'Brien
- Laboratory of Genomic Diversity, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702 Theodosius Dobzhansky Center for Genome Bioinformatics, St. Petersburg State University, St. Petersburg, Russia
| | - David K Ryugo
- Department of Otolaryngology, Head and Neck Surgery, Center for Hearing Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 Garvan Institute of Medical Research, Sydney, New South Wales, Australia
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16
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Wilkins AS, Wrangham RW, Fitch WT. The "domestication syndrome" in mammals: a unified explanation based on neural crest cell behavior and genetics. Genetics 2014; 197:795-808. [PMID: 25024034 PMCID: PMC4096361 DOI: 10.1534/genetics.114.165423] [Citation(s) in RCA: 328] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Charles Darwin, while trying to devise a general theory of heredity from the observations of animal and plant breeders, discovered that domesticated mammals possess a distinctive and unusual suite of heritable traits not seen in their wild progenitors. Some of these traits also appear in domesticated birds and fish. The origin of Darwin's "domestication syndrome" has remained a conundrum for more than 140 years. Most explanations focus on particular traits, while neglecting others, or on the possible selective factors involved in domestication rather than the underlying developmental and genetic causes of these traits. Here, we propose that the domestication syndrome results predominantly from mild neural crest cell deficits during embryonic development. Most of the modified traits, both morphological and physiological, can be readily explained as direct consequences of such deficiencies, while other traits are explicable as indirect consequences. We first show how the hypothesis can account for the multiple, apparently unrelated traits of the syndrome and then explore its genetic dimensions and predictions, reviewing the available genetic evidence. The article concludes with a brief discussion of some genetic and developmental questions raised by the idea, along with specific predictions and experimental tests.
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Affiliation(s)
- Adam S Wilkins
- Stellenbosch Institute of Advanced Study, Stellenbosch 7600, South Africa Institute of Theoretical Biology, Humboldt University zu Berlin, Berlin 10115, Germany
| | - Richard W Wrangham
- Stellenbosch Institute of Advanced Study, Stellenbosch 7600, South Africa Department of Human Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
| | - W Tecumseh Fitch
- Department of Cognitive Biology, University of Vienna, A-1090 Vienna, Austria
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17
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Fontanesi L, Vargiolu M, Scotti E, Latorre R, Faussone Pellegrini MS, Mazzoni M, Asti M, Chiocchetti R, Romeo G, Clavenzani P, De Giorgio R. The KIT gene is associated with the english spotting coat color locus and congenital megacolon in Checkered Giant rabbits (Oryctolagus cuniculus). PLoS One 2014; 9:e93750. [PMID: 24736498 PMCID: PMC3988019 DOI: 10.1371/journal.pone.0093750] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 03/06/2014] [Indexed: 11/19/2022] Open
Abstract
The English spotting coat color locus in rabbits, also known as Dominant white spotting locus, is determined by an incompletely dominant allele (En). Rabbits homozygous for the recessive wild-type allele (en/en) are self-colored, heterozygous En/en rabbits are normally spotted, and homozygous En/En animals are almost completely white. Compared to vital en/en and En/en rabbits, En/En animals are subvital because of a dilated (“mega”) cecum and ascending colon. In this study, we investigated the role of the KIT gene as a candidate for the English spotting locus in Checkered Giant rabbits and characterized the abnormalities affecting enteric neurons and c-kit positive interstitial cells of Cajal (ICC) in the megacolon of En/En rabbits. Twenty-one litters were obtained by crossing three Checkered Giant bucks (En/en) with nine Checkered Giant (En/en) and two en/en does, producing a total of 138 F1 and backcrossed rabbits. Resequencing all coding exons and portions of non-coding regions of the KIT gene in 28 rabbits of different breeds identified 98 polymorphisms. A single nucleotide polymorphism genotyped in all F1 families showed complete cosegregation with the English spotting coat color phenotype (θ = 0.00 LOD = 75.56). KIT gene expression in cecum and colon specimens of En/En (pathological) rabbits was 5–10% of that of en/en (control) rabbits. En/En rabbits showed reduced and altered c-kit immunolabelled ICC compared to en/en controls. Morphometric data on whole mounts of the ascending colon showed a significant decrease of HuC/D (P<0.05) and substance P (P<0.01) immunoreactive neurons in En/En vs. en/en. Electron microscopy analysis showed neuronal and ICC abnormalities in En/En tissues. The En/En rabbit model shows neuro-ICC changes reminiscent of the human non-aganglionic megacolon. This rabbit model may provide a better understanding of the molecular abnormalities underlying conditions associated with non-aganglionic megacolon.
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Affiliation(s)
- Luca Fontanesi
- Department of Agricultural and Food Sciences, Division of Animal Sciences, Laboratory of Livestock Genomics, University of Bologna, Bologna, Italy
- Centre for Genome Biology, University of Bologna, Bologna, Italy
- * E-mail: (LF); (RDG)
| | - Manuela Vargiolu
- Health Sciences and Technologies-Interdepartmental Center for Industrial Research, University of Bologna, Bologna, Italy
| | - Emilio Scotti
- Department of Agricultural and Food Sciences, Division of Animal Sciences, Laboratory of Livestock Genomics, University of Bologna, Bologna, Italy
| | - Rocco Latorre
- Department of Veterinary Medical Science, University of Bologna, Bologna, Italy
- Department of Medical and Surgical Sciences, Centro Unificato di Ricerca Biomedica Applicata (C.R.B.A.), St. Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy
| | | | - Maurizio Mazzoni
- Department of Veterinary Medical Science, University of Bologna, Bologna, Italy
| | - Martina Asti
- Department of Veterinary Medical Science, University of Bologna, Bologna, Italy
| | - Roberto Chiocchetti
- Department of Veterinary Medical Science, University of Bologna, Bologna, Italy
| | - Giovanni Romeo
- Department of Medical and Surgical Sciences, Medical Genetics Unit, St. Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy
| | - Paolo Clavenzani
- Department of Veterinary Medical Science, University of Bologna, Bologna, Italy
| | - Roberto De Giorgio
- Department of Medical and Surgical Sciences, Centro Unificato di Ricerca Biomedica Applicata (C.R.B.A.), St. Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy
- * E-mail: (LF); (RDG)
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18
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2012 Curt Stern Award address. Am J Hum Genet 2013; 92:340-4. [PMID: 23472756 DOI: 10.1016/j.ajhg.2012.11.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 11/19/2012] [Accepted: 11/19/2012] [Indexed: 11/23/2022] Open
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19
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Hoque MR, Lee SH, Lim DJ, Cho IC, Choi NR, Seo DW, Lee JH. Investigation of KIT Gene Polymorphisms in Korean Cattle. JOURNAL OF ANIMAL SCIENCE AND TECHNOLOGY 2012. [DOI: 10.5187/jast.2012.54.6.411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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Jackling FC, Johnson WE, Appleton BR. The genetic inheritance of the blue-eyed white phenotype in alpacas (Vicugna pacos). J Hered 2012; 105:847-57. [PMID: 23144493 DOI: 10.1093/jhered/ess093] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
White-spotting patterns in mammals can be caused by mutations in the gene KIT, whose protein is necessary for the normal migration and survival of melanocytes from the neural crest. The alpaca (Vicugna pacos) blue-eyed white (BEW) phenotype is characterized by 2 blue eyes and a solid white coat over the whole body. Breeders hypothesize that the BEW phenotype in alpacas is caused by the combination of the gene causing gray fleece and a white-spotting gene. We performed an association study using KIT flanking and intragenic markers with 40 unrelated alpacas, of which 17 were BEW. Two microsatellite alleles at KIT-related markers were significantly associated (P < 0.0001) with the BEW phenotype (bew1 and bew2). In a larger cohort of 171 related individuals, we identify an abundance of an allele (bew1) in gray animals and the occurrence of bew2 homozygotes that are solid white with pigmented eyes. Association tests accounting for population structure and familial relatedness are consistent with a proposed model where these alleles are in linkage disequilibrium with a mutation or mutations that contribute to the BEW phenotype and to individual differences in fleece color.
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Affiliation(s)
- Felicity C Jackling
- From the Department of Genetics, The University of Melbourne, Melbourne 3010, Australia Laboratory of Genomic Diversity, NCI-Frederick, National Institutes of Health, Frederick, MD 21702
| | - Warren E Johnson
- From the Department of Genetics, The University of Melbourne, Melbourne 3010, Australia Laboratory of Genomic Diversity, NCI-Frederick, National Institutes of Health, Frederick, MD 21702
| | - Belinda R Appleton
- From the Department of Genetics, The University of Melbourne, Melbourne 3010, Australia Laboratory of Genomic Diversity, NCI-Frederick, National Institutes of Health, Frederick, MD 21702
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21
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Abstract
Piebaldism is an uncommon autosomal dominantly inherited pigment anomaly characterized by a congenital white forelock and leukoderma on the frontal scalp, forehead, ventral trunk and extremities. It is caused by a loss-of-function mutation in the KIT gene. Genetic analyses reveal a consistent genotype-phenotype relationship in piebaldism. However, recently reported cases of piebaldism that are milder or severer than genetically expected indicate that other factors, such as a modifier gene of MC1R, influence skin and hair color. The KIT ligand/KIT that triggers the Ras/mitogen-activated protein kinase signaling pathway play essential functions in the migration, proliferation, survival, melanogenesis and melanosome transfer of the melanocytes. We summarize current research progress in piebaldism and related disorders.
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Affiliation(s)
- Naoki Oiso
- Department of Dermatology, Kinki University Faculty of Medicine, Osakasayama, Japan.
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22
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Li J, Song JS, Bell RJA, Tran TNT, Haq R, Liu H, Love KT, Langer R, Anderson DG, Larue L, Fisher DE. YY1 regulates melanocyte development and function by cooperating with MITF. PLoS Genet 2012; 8:e1002688. [PMID: 22570637 PMCID: PMC3342948 DOI: 10.1371/journal.pgen.1002688] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Accepted: 03/20/2012] [Indexed: 11/18/2022] Open
Abstract
Studies of coat color mutants have greatly contributed to the discovery of genes that regulate melanocyte development and function. Here, we generated Yy1 conditional knockout mice in the melanocyte-lineage and observed profound melanocyte deficiency and premature gray hair, similar to the loss of melanocytes in human piebaldism and Waardenburg syndrome. Although YY1 is a ubiquitous transcription factor, YY1 interacts with M-MITF, the Waardenburg Syndrome IIA gene and a master transcriptional regulator of melanocytes. YY1 cooperates with M-MITF in regulating the expression of piebaldism gene KIT and multiple additional pigmentation genes. Moreover, ChIP–seq identified genome-wide YY1 targets in the melanocyte lineage. These studies mechanistically link genes implicated in human conditions of melanocyte deficiency and reveal how a ubiquitous factor (YY1) gains lineage-specific functions by co-regulating gene expression with a lineage-restricted factor (M-MITF)—a general mechanism which may confer tissue-specific gene expression in multiple lineages. Skin and hair pigmentation is among the most identifiable human traits. Disorders of pigment cells, melanocytes, result in multiple hypopigmentation conditions. Here, we described the phenotype of loss of a ubiquitous transcription factor YY1 in mouse melanocytes, which is reminiscent of certain human hypopigmentation conditions. We revealed at a molecular level that YY1 cooperates with a melanocyte-specific transcription factor M-MITF to regulate survival and pigmentation gene expression. This study is the first report of YY1 function in melanocyte lineage, and it reveals how a ubiquitous transcription factor gains lineage-specific functions by co-regulating gene expression with a lineage-restricted transcription factor.
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Affiliation(s)
- Juying Li
- Department of Dermatology, Cutaneous Biology Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Jun S. Song
- Institute for Human Genetics, University of California San Francisco, San Francisco, California, United States of America
- Department of Epidemiology and Biostatistics, Department of Bioengineering and Therapeutic Sciences, The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California San Francisco, San Francisco, California, United States of America
- * E-mail: (JSS); (DEF)
| | - Robert J. A. Bell
- Institute for Human Genetics, University of California San Francisco, San Francisco, California, United States of America
| | - Thanh-Nga T. Tran
- Department of Dermatology, Cutaneous Biology Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Rizwan Haq
- Department of Dermatology, Cutaneous Biology Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
- Division of Medical Oncology, Massachusetts General Hospital, Boston, Massachusetts, United States of America
| | - Huifei Liu
- Children's Hospital Boston, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Kevin T. Love
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Robert Langer
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Harvard–MIT Division of Health Sciences and Technology, Cambridge, Massachusetts, United States of America
| | - Daniel G. Anderson
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Harvard–MIT Division of Health Sciences and Technology, Cambridge, Massachusetts, United States of America
| | - Lionel Larue
- Institut Curie, Developmental Genetics of Melanocytes, U1021 INSERM, UMR 3347 CNRS, Orsay, France
| | - David E. Fisher
- Department of Dermatology, Cutaneous Biology Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
- * E-mail: (JSS); (DEF)
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23
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Abstract
Coat color of horse is an important basis for both species identification and individual recognition and is also one of the important references traits for breeding. Therefore, the research on the mechanism of coat fading has become an important part of horses' coat color study. It has been found that the white phenotype is closely related to the mutation of kit gene, which is located on chromosome 3. Investigated results showed that the formation of the epidermal melanoblast and melanin relies on the expression of kit gene, which determines the presence of white phenotype. Nevertheless, studies results have shown that the mutation of kit gene in the white horse exhibited significant differences among species. Horses that the coat color completely faded are very rare and are found occasionally in a few species. However, a larger number of horses that coat color completely faded, called Mongolian white horse, are found in West Ujimqin , Xilin Gol League, Inner Mongolia. Therefore, genetic mechanism of color fading in Mongolian white horses is still not clear. No typical mutations have been observed in 21 exons of kit gene in Mongolian white horse. This paper summarized recent international studies on molecular mechanism of color fading and tried to lay the foundation for the study of formation mechanism of Mongolian white horse. The aim of this review is to provide some valuable references to horses coat color research and breeding.
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Arase N, Wataya-Kaneda M, Oiso N, Tanemura A, Kawada A, Suzuki T, Katayama I. Repigmentation of leukoderma in a piebald patient associated with a novel c-KIT gene mutation, G592E, of the tyrosine kinase domain. J Dermatol Sci 2011; 64:147-9. [DOI: 10.1016/j.jdermsci.2011.08.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Revised: 08/17/2011] [Accepted: 08/21/2011] [Indexed: 11/29/2022]
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25
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Affiliation(s)
- Aaron J Schetter
- National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
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26
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Phung B, Sun J, Schepsky A, Steingrimsson E, Rönnstrand L. C-KIT signaling depends on microphthalmia-associated transcription factor for effects on cell proliferation. PLoS One 2011; 6:e24064. [PMID: 21887372 PMCID: PMC3161112 DOI: 10.1371/journal.pone.0024064] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Accepted: 08/04/2011] [Indexed: 11/18/2022] Open
Abstract
The development of melanocytes is regulated by the tyrosine kinase receptor c-KIT and the basic-helix-loop-helix-leucine zipper transcription factor Mitf. These essential melanocyte survival regulators are also well known oncogenic factors in malignant melanoma. Despite their importance, not much is known about the regulatory mechanisms and signaling pathways involved. In this study, we therefore sought to identify the signaling pathways and mechanisms involved in c-KIT mediated regulation of Mitf. We report that c-KIT stimulation leads to the activation of Mitf specifically through the c-KIT phosphorylation sites Y721 (PI3 kinase binding site), Y568 and Y570 (Src binding site). Our study not only confirms the involvement of Ras-Erk signaling pathway in the activation of Mitf, but also establishes that Src kinase binding to Y568 and Y570 of c-KIT is required. Using specific inhibitors we observe and verify that c-KIT induced activation of Mitf is dependent on PI3-, Akt-, Src-, p38- or Mek kinases. Moreover, the proliferative effect of c-KIT is dependent on Mitf in HEK293T cells. In contrast, c-KIT Y568F and Y721F mutants are less effective in driving cell proliferation, compared to wild type c-KIT. Our results reveal novel mechanisms by which c-KIT signaling regulates Mitf, with implications for understanding both melanocyte development and melanoma.
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Affiliation(s)
- Bengt Phung
- Wallenberg Laboratory, Experimental Clinical Chemistry, Department of Laboratory Medicine, Lund University, Skåne University Hospital, Malmö, Sweden.
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27
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García-Gámez E, Reverter A, Whan V, McWilliam SM, Arranz JJ, Kijas J. Using regulatory and epistatic networks to extend the findings of a genome scan: identifying the gene drivers of pigmentation in merino sheep. PLoS One 2011; 6:e21158. [PMID: 21701676 PMCID: PMC3119053 DOI: 10.1371/journal.pone.0021158] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Accepted: 05/22/2011] [Indexed: 01/12/2023] Open
Abstract
Extending genome wide association analysis by the inclusion of gene expression data may assist in the dissection of complex traits. We examined piebald, a pigmentation phenotype in both human and Merino sheep, by analysing multiple data types using a systems approach. First, a case control analysis of 49,034 ovine SNP was performed which confirmed a multigenic basis for the condition. We combined these results with gene expression data from five tissue types analysed with a skin-specific microarray. Promoter sequence analysis of differentially expressed genes allowed us to reverse-engineer a regulatory network. Likewise, by testing two-loci models derived from all pair-wise comparisons across piebald-associated SNP, we generated an epistatic network. At the intersection of both networks, we identified thirteen genes with insulin-like growth factor binding protein 7 (IGFBP7), platelet-derived growth factor alpha (PDGFRA) and the tetraspanin platelet activator CD9 at the kernel of the intersection. Further, we report a number of differentially expressed genes in regions containing highly associated SNP including ATRN, DOCK7, FGFR1OP, GLI3, SILV and TBX15. The application of network theory facilitated co-analysis of genetic variation with gene expression, recapitulated aspects of the known molecular biology of skin pigmentation and provided insights into the transcription regulation and epistatic interactions involved in piebald Merino sheep.
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Affiliation(s)
- Elsa García-Gámez
- Livestock Industries, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Brisbane, Queensland, Australia
- Departamento de Producción Animal, Universidad de León, León, Spain
| | - Antonio Reverter
- Livestock Industries, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Brisbane, Queensland, Australia
| | - Vicki Whan
- Livestock Industries, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Brisbane, Queensland, Australia
| | - Sean M. McWilliam
- Livestock Industries, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Brisbane, Queensland, Australia
| | - Juan José Arranz
- Departamento de Producción Animal, Universidad de León, León, Spain
| | | | - James Kijas
- Livestock Industries, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Brisbane, Queensland, Australia
- * E-mail:
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28
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Serre C, Lebleu A, Bergeron L, Plantivaux A, Botto JM, Dal Farra C, Domloge N. Microarray profiling of gene expression in human keratinocytes suggests a new protective activity against UV-induced DNA damage for a compound previously known to interact with SCF-KIT signalling pathway. Int J Cosmet Sci 2011; 33:398-407. [PMID: 21382056 DOI: 10.1111/j.1468-2494.2011.00641.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The stem cell factor (SCF) and its protein-tyrosine kinase receptor KIT are together implicated in the regulation of diverse biological processes and particularly in melanogenesis. Indeed, this signalling pathway controls melanoblast migration from the neural crest during embryogenesis and allows the communication between keratinocytes and melanocytes in the adult. In melanocytes, the binding of SCF to its transmembrane receptor leads to the activation of signalling pathways implicating protein kinases which finally control the expression of pigmentation-related genes. We have developed a biological compound called IV09.007, which we previously described as a modulator of the SCF/KIT signalling pathway with a pro-pigmenting effect. In the present work, we have studied the expression and localization of both SCF and KIT mRNAs and proteins in the skin or skin-derived cell lines. Then, we explored with a microarray approach the ability of IV09.007 to modulate the expression of genes in human keratinocytes and melanocytes in culture. Thereby, we observed the regulation of genes implicated in DNA repair, mainly related to base/nucleotides excision pathways. A modulated transcriptional response was also observed for some genes implicated in the response against oxidative stress, in apoptosis inhibition and in lowering inflammatory immune response. These microarray results predicted a conferred protective effect of IV09.007 and we verified this hypothesis by performing comet assays on UVB-irradiated keratinocytes or melanocytes, to demonstrate the efficacy of IV09.007 on preventing DNA damage.
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Affiliation(s)
- C Serre
- ISP VINCIENCE, Sophia Antipolis, France
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From melanocyte to metastatic malignant melanoma. Dermatol Res Pract 2010; 2010. [PMID: 20936153 PMCID: PMC2948895 DOI: 10.1155/2010/583748] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2010] [Revised: 04/22/2010] [Accepted: 07/15/2010] [Indexed: 12/30/2022] Open
Abstract
Malignant melanoma is one of the most aggressive malignancies in human and is responsible for almost 60% of lethal skin tumors. Its incidence has been increasing in white population in the past two decades. There is a complex interaction of environmental (exogenous) and endogenous, including genetic, risk factors in developing malignant melanoma. 8–12% of familial melanomas occur in a familial setting related to mutation of the CDKN2A gene that encodes p16. The aim of this is to briefly review the microanatomy and physiology of the melanocytes, epidemiology, risk factors, clinical presentation, historical classification and histopathology and, more in details, the most recent discoveries in biology and genetics of malignant melanoma. At the end, the final version of 2009 AJCC malignant melanoma staging and classification is presented.
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Wu BJ, Yin LJ, Yin HP, Ying XS, Yang WW, Zeng YM, Zhu J, Kang XD, Liu GJ, Yu LP, Gu ME, Wu PL. A mutation in the Kit gene leads to novel gonadal phenotypes in both heterozygous and homozygous mice. Hereditas 2010; 147:62-9. [DOI: 10.1111/j.1601-5223.2009.02131.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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Guo XL, Ruan HB, Li Y, Gao X, Li W. Identification of a novel nonsense mutation on the Pax3 gene in ENU-derived white belly spotting mice and its genetic interaction with c-Kit. Pigment Cell Melanoma Res 2010; 23:252-62. [PMID: 20095975 DOI: 10.1111/j.1755-148x.2010.00677.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
In the course of a large-scale screening program of N-ethyl-N-nitrosourea mutagenesis, we isolated two semidominant mutation lines with white belly spotting, named as wps and wbs. Direct sequencing detected a nucleotide G-to-A transversion in exon 2 of the c-Kit gene in wps, which resulted in a missense D60N mutation. Another mutant, wbs, was mapped to chromosome 1 by genome-wide linkage analysis. In 93 meioses, the wbs locus was confined to a 5.2-Mb region between D1Mit380 and D1Mit215, including the Pax3 gene. A nonsense mutation K107X on the Pax3 coding region in wbs mice was identified, causing the loss of Pax3 protein in the homozygous mutant. We further demonstrated that Pax3 exhibited genetic interaction with c-Kit by intercrossing the wps and wbs mice. Further, Pax3 transactivated the c-Kit promoter in different cell lines. However, electrophoretic mobility shift assays showed that Pax3 did not bind to the c-Kit promoter, indicating that Pax3 may interact with c-Kit in an indirect way. This expands our understanding of the intricate regulatory network governing the melanocyte development.
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Affiliation(s)
- Xiao-Li Guo
- Key Laboratory of Molecular Developmental Biology, Institute of Genetics & Developmental Biology, Chinese Academy of Sciences, Beijing, China
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Fontanesi L, Tazzoli M, Russo V, Beever J. Genetic heterogeneity at the bovine KIT gene in cattle breeds carrying different putative alleles at the spotting locus. Anim Genet 2009; 41:295-303. [PMID: 19968642 DOI: 10.1111/j.1365-2052.2009.02007.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
According to classical genetic studies, piebaldism in cattle is largely influenced by the allelic series at the spotting locus (S), which includes the S(H) (Hereford pattern), S(+) (non-spotted) and s (spotted) alleles. The S locus was mapped on bovine chromosome 6 in the region containing the KIT gene. We investigated the KIT gene, analysing its variability and haplotype distribution in cattle of three breeds (Angus, Hereford and Holstein) with different putative alleles (S(+), S(H) and s respectively) at the S locus. Resequencing of a whole of 0.485 Mb revealed 111 polymorphisms. The global nucleotide diversity was 0.087%. Tajima's D-values were negative for all breeds, indicating putative directional selection. Of the 28 inferred haplotypes, only five were observed in the Hereford breed, in which one was the most frequent. Coalescent simulation showed that it is highly unlikely (P < 10E-6) to obtain this low number of haplotypes conditionally on the observed number of segregating SNPs. Therefore, the neutral model could be rejected for the Hereford breed, suggesting that a selection sweep occurred at the KIT locus. Twelve haplotypes were inferred in Holstein and Angus. For these two breeds, the neutral model could not be rejected. High heterogeneity of the KIT gene was confirmed from a phylogenetic analysis. Our results suggest a role of the KIT gene in determining the S(H) allele(s) in the Hereford, but no evidence of selective sweep was obtained in Holstein, suggesting that complex mechanisms (or other genes) might be the cause of the spotted phenotype in this breed.
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Affiliation(s)
- L Fontanesi
- DIPROVAL, Sezione di Allevamenti Zootecnici, Faculty of Agriculture, University of Bologna, Via F.lli Rosselli 107, 42123 Reggio Emilia, Italy.
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Gonadial Abnormality and Homozygous Decease from the Nonsense Mutation of <I>Kit</I> in W<SUP>-3Bao</SUP> Mouse. Zool Res 2009. [DOI: 10.3724/sp.j.1141.2009.01045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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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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Haase B, Obexer-Ruff G, Dolf G, Rieder S, Burger D, Poncet PA, Gerber V, Howard J, Leeb T. Haematological parameters are normal in dominant white Franches-Montagnes horses carrying a KIT mutation. Vet J 2009; 184:315-7. [PMID: 19362501 DOI: 10.1016/j.tvjl.2009.02.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2008] [Revised: 02/05/2009] [Accepted: 02/06/2009] [Indexed: 11/19/2022]
Abstract
The KIT receptor protein-tyrosine kinase plays an important role during embryonic development. Activation of KIT is crucial for the development of various cell lineages such as melanoblasts, stem cells of the haematopoietic system, spermatogonia and intestinal cells of Cajal. In mice, many mutations in the Kit gene cause pigmentation disorders accompanied by pleiotropic effects on blood cells and male fertility. Previous work has demonstrated that dominant white Franches-Montagnes horses carry one copy of the KIT gene with the p.Y717X mutation. The targeted breeding of white horses would be ethically questionable if white horses were known to suffer from anaemia or leukopenia. The present study demonstrates that no statistically significant differences in peripheral blood parameters are detectable between dominant white and solid-coloured Franches-Montagnes horses. The data indicate that KIT mutations may have different effects in mice, pigs, and horses. The KIT p.Y717X mutation does not have a major negative effect on the haematopoietic system of dominant white horses.
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Affiliation(s)
- Bianca Haase
- Institute of Genetics, Vetsuisse-Faculty, University of Berne, Bremgartenstr. 109a, P.O. Box 8466, 3001 Berne, Switzerland
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Imatinib mesylate–induced repigmentation of vitiligo lesions in a patient with recurrent gastrointestinal stromal tumors. J Am Acad Dermatol 2008; 59:S80-3. [DOI: 10.1016/j.jaad.2008.06.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2008] [Revised: 06/24/2008] [Indexed: 12/18/2022]
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38
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CHOW RKP, STEWART WD, HO VC. Graft-versus-host reaction affecting lesional skin but not normal skin in a patient with piebaldism. Br J Dermatol 2008. [DOI: 10.1046/j.1365-2133.1996.d01-760.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Haase B, Brooks SA, Schlumbaum A, Azor PJ, Bailey E, Alaeddine F, Mevissen M, Burger D, Poncet PA, Rieder S, Leeb T. Allelic heterogeneity at the equine KIT locus in dominant white (W) horses. PLoS Genet 2008; 3:e195. [PMID: 17997609 PMCID: PMC2065884 DOI: 10.1371/journal.pgen.0030195] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2007] [Accepted: 09/24/2007] [Indexed: 11/19/2022] Open
Abstract
White coat color has been a highly valued trait in horses for at least 2,000 years. Dominant white (W) is one of several known depigmentation phenotypes in horses. It shows considerable phenotypic variation, ranging from approximately 50% depigmented areas up to a completely white coat. In the horse, the four depigmentation phenotypes roan, sabino, tobiano, and dominant white were independently mapped to a chromosomal region on ECA 3 harboring the KIT gene. KIT plays an important role in melanoblast survival during embryonic development. We determined the sequence and genomic organization of the approximately 82 kb equine KIT gene. A mutation analysis of all 21 KIT exons in white Franches-Montagnes Horses revealed a nonsense mutation in exon 15 (c.2151C>G, p.Y717X). We analyzed the KIT exons in horses characterized as dominant white from other populations and found three additional candidate causative mutations. Three almost completely white Arabians carried a different nonsense mutation in exon 4 (c.706A>T, p.K236X). Six Camarillo White Horses had a missense mutation in exon 12 (c.1805C>T, p.A602V), and five white Thoroughbreds had yet another missense mutation in exon 13 (c.1960G>A, p.G654R). Our results indicate that the dominant white color in Franches-Montagnes Horses is caused by a nonsense mutation in the KIT gene and that multiple independent mutations within this gene appear to be responsible for dominant white in several other modern horse populations.
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Affiliation(s)
- Bianca Haase
- Institute of Genetics, Vetsuisse Faculty, University of Berne, Berne, Switzerland
- DermFocus, Vetsuisse Faculty, University of Berne, Berne, Switzerland
| | - Samantha A Brooks
- M. H. Gluck Equine Research Center, University of Kentucky, Lexington, Kentucky, United States of America
| | - Angela Schlumbaum
- Institute of Prehistory and Archaeological Sciences, University of Basel, Basel, Switzerland
| | - Pedro J Azor
- Institute of Genetics, Vetsuisse Faculty, University of Berne, Berne, Switzerland
- Department of Genetics, University of Cordoba, Gregory Mendel Building, Cordoba, Spain
| | - Ernest Bailey
- M. H. Gluck Equine Research Center, University of Kentucky, Lexington, Kentucky, United States of America
| | - Ferial Alaeddine
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Berne, Berne, Switzerland
| | - Meike Mevissen
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Berne, Berne, Switzerland
| | | | | | - Stefan Rieder
- Swiss College of Agriculture, Zollikofen, Switzerland
| | - Tosso Leeb
- Institute of Genetics, Vetsuisse Faculty, University of Berne, Berne, Switzerland
- DermFocus, Vetsuisse Faculty, University of Berne, Berne, Switzerland
- * To whom correspondence should be addressed. E-mail:
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NORRIS A, TODD C, GRAHAM A, QUINN A, THODY A. The expression of thec-kitreceptor by epidermal melanocytes may be reduced in vitiligo. Br J Dermatol 2008. [DOI: 10.1111/j.1365-2133.1996.tb07618.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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41
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Haase B, Jude R, Brooks SA, Leeb T. An equine chromosome 3 inversion is associated with the tobiano spotting pattern in German horse breeds. Anim Genet 2008; 39:306-9. [DOI: 10.1111/j.1365-2052.2008.01715.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Carlson JA, Linette GP, Aplin A, Ng B, Slominski A. Melanocyte receptors: clinical implications and therapeutic relevance. Dermatol Clin 2007; 25:541-57, viii-ix. [PMID: 17903613 PMCID: PMC2732336 DOI: 10.1016/j.det.2007.06.005] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The activation or the inhibition of melanocyte-specific receptors offers novel means of augmenting normal melanocyte function, skin color, and photoprotection, or treating melanocytic disorders, namely at this time, metastatic melanoma. Melanocyte-specific receptors include melanocortin-1 (MCR1) and melatonin receptors. Other receptors that play an important role in melanoma progression are G-protein couple receptors such as Frizzled 5 and receptor tyrosine kinases such as c-Kit and hepatocyte growth factor (HGF) receptor. These receptors activate two crucial cell-signaling pathways, RAS/RAF/MEK/ERK and PI3K/AKT, integral to melanoma cell survival, and can serve as targets for therapy of disseminated melanoma. Activation of death receptors is another pathway that can be exploited with targeted therapeutics to control advanced melanoma. This article reviews the current understanding of melanocyte receptors, their agonists and inhibitors, and their potential to treat the melanocytic pathology.
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Affiliation(s)
- J Andrew Carlson
- Division of Dermatopathology and Dermatology, Department of Pathology and Laboratory Medicine, Albany Medical College MC-81, 47 New Scotland Avenue, Albany, NY 12208, USA.
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Yuzawa S, Opatowsky Y, Zhang Z, Mandiyan V, Lax I, Schlessinger J. Structural basis for activation of the receptor tyrosine kinase KIT by stem cell factor. Cell 2007; 130:323-34. [PMID: 17662946 DOI: 10.1016/j.cell.2007.05.055] [Citation(s) in RCA: 248] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2007] [Revised: 04/25/2007] [Accepted: 05/22/2007] [Indexed: 01/15/2023]
Abstract
Stem Cell Factor (SCF) initiates its multiple cellular responses by binding to the ectodomain of KIT, resulting in tyrosine kinase activation. We describe the crystal structure of the entire ectodomain of KIT before and after SCF stimulation. The structures show that KIT dimerization is driven by SCF binding whose sole role is to bring two KIT molecules together. Receptor dimerization is followed by conformational changes that enable lateral interactions between membrane proximal Ig-like domains D4 and D5 of two KIT molecules. Experiments with cultured cells show that KIT activation is compromised by point mutations in amino acids critical for D4-D4 interaction. Moreover, a variety of oncogenic mutations are mapped to the D5-D5 interface. Since key hallmarks of KIT structures, ligand-induced receptor dimerization, and the critical residues in the D4-D4 interface, are conserved in other receptors, the mechanism of KIT stimulation unveiled in this report may apply for other receptor activation.
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Affiliation(s)
- Satoru Yuzawa
- Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA
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44
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Antonescu CR, Busam KJ, Francone TD, Wong GC, Guo T, Agaram NP, Besmer P, Jungbluth A, Gimbel M, Chen CT, Veach D, Clarkson BD, Paty PB, Weiser MR. L576P KIT mutation in anal melanomas correlates with KIT protein expression and is sensitive to specific kinase inhibition. Int J Cancer 2007; 121:257-64. [PMID: 17372901 DOI: 10.1002/ijc.22681] [Citation(s) in RCA: 206] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Activating mutations in either BRAF or NRAS are seen in a significant number of malignant melanomas, but their incidence appears to be dependent to ultraviolet light exposure. Thus, BRAF mutations have the highest incidence in non-chronic sun damaged (CSD), and are uncommon in acral, mucosal and CSD melanomas. More recently, activating KIT mutations have been described in rare cases of metastatic melanoma, without further reference to their clinical phenotypes. This finding is intriguing since KIT expression is downregulated in most melanomas progressing to more aggressive lesions. In this study, we investigated a group of anal melanomas for the presence of BRAF, NRAS, KIT and PDGFRA mutations. A heterozygous KIT exon 11 L576P substitution was identified in 3 of 20 cases tested. The 3 KIT mutation-carrying tumors were strongly immunopositive for KIT protein. No KIT mutations were identified in tumors with less than 4+ KIT immunostaining. NRAS mutation was identified in one tumor. No BRAF or PDGFRA mutations were identified in either KIT positive or negative anal melanomas. In vitro drug testing of stable transformant Ba/F3 KIT(L576P) mutant cells showed sensitivity for dasatinib (previously known as BMS-354825), a dual SRC/ABL kinase inhibitor, and imatinib. However, compared to an imatinib-sensitive KIT mutant, dasatinib was potent at lower doses than imatinib in the KIT(L576P) mutant. These results suggest that a subset of anal melanomas show activating KIT mutations, which are susceptible for therapy with specific kinase inhibitors.
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Affiliation(s)
- Cristina R Antonescu
- Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY, USA.
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KIT is required for hepatic function during mouse post-natal development. BMC DEVELOPMENTAL BIOLOGY 2007; 7:81. [PMID: 17612398 PMCID: PMC1940254 DOI: 10.1186/1471-213x-7-81] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2006] [Accepted: 07/05/2007] [Indexed: 12/13/2022]
Abstract
Background The Kit gene encodes a receptor tyrosine kinase involved in various biological processes including melanogenesis, hematopoiesis and gametogenesis in mice and human. A large number of Kit mutants has been described so far showing the pleiotropic phenotypes associated with partial loss-of-function of the gene. Hypomorphic mutations can induce a light coat color phenotype while complete lack of KIT function interferes with embryogenesis. Interestingly several intermediate hypomorphic mutations induced in addition growth retardation and post-natal mortality. Results In this report we investigated the post-natal role of Kit by using a panel of chemically-induced hypomorphic mutations recently isolated in the mouse. We found that, in addition to the classical phenotypes, mutations of Kit induced juvenile steatosis, associated with the downregulation of the three genes, VldlR, Lpin1 and Lpl, controlling lipid metabolism in the post-natal liver. Hence, Kit loss-of-functions mimicked the inactivation of genes controlling the hepatic metabolism of triglycerides, the major source of energy from maternal milk, leading to growth and viability defects during neonatal development. Conclusion This is a first report involving KIT in the control of lipid metabolism in neonates and opening new perspectives for understanding juvenile steatosis. Moreover, it reinforces the role of Kit during development of the liver and underscores the caution that should be exerted in using KIT inhibitors during anti-cancer treatment.
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46
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Randall VA. Hormonal regulation of hair follicles exhibits a biological paradox. Semin Cell Dev Biol 2007; 18:274-85. [PMID: 17379547 DOI: 10.1016/j.semcdb.2007.02.004] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2006] [Revised: 02/03/2007] [Accepted: 02/05/2007] [Indexed: 12/22/2022]
Abstract
Hair's importance for insulation and camouflage or human communication means that hairs need to change with season, age or sexual development. Regular, regenerating hair follicle growth cycles produce new hairs which may differ in colour and/or size, e.g., beard development. Hormones of the pineal-hypothalamus-pituitary axis coordinate seasonal changes, while androgens regulate most sexual aspects with paradoxically different effects depending on body site; compare beard growth and balding! Hormones affect follicular mesenchymal-epithelial interactions altering growing time, dermal papilla size and dermal papilla cell, keratinocyte and melanocyte activity. Greater understanding of these mechanisms should improve treatments for poorly controlled hair disorders, alopecia and hirsutism.
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Affiliation(s)
- Valerie Anne Randall
- Division of Biomedical Sciences, The University of Bradford, Bradford BD7 1DP, UK.
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Sriwiriyanont P, Ohuchi A, Hachiya A, Visscher MO, Boissy RE. Interaction between stem cell factor and endothelin-1: effects on melanogenesis in human skin xenografts. J Transl Med 2006; 86:1115-25. [PMID: 16940961 DOI: 10.1038/labinvest.3700469] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The two paracrine melanogenic cytokines, stem cell factor (SCF) and endothelin-1 (ET-1), have been demonstrated to play pivotal roles in skin pigmentation including UVB-induced pigmentation and senile lentigo. However, little is known regarding their interactive effect on skin pigmentation. In order to investigate their roles in vivo, facultative pigmentation of human skin xenografts on severe combined immunodeficient (SCID) mice was assessed. After 1 week of acclimation in a pathogen-free barrier, dermatomed fresh cadaveric skin was surgically grafted onto the back of the mice and allowed to heal for 5-6 weeks prior to cytokine administration. Intradermal injections of SCF at 0.7 or 2.0 microg significantly increased skin pigmentation when compared to vehicle control. Despite the lack of a dose-dependent pigmentation response following ET-1 administration, the combination of 0.2 microg SCF and 0.1 microg ET-1 demonstrated a statistically significant increase in tyrosinase gene expression substantiated by the enhancement of melanin content and skin pigmentation compared to treatment with SCF alone or ET-1 alone. These findings establish an in vivo interaction between SCF and ET-1 with regard to their capacity to effect an increase in skin pigmentation.
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Affiliation(s)
- Penkanok Sriwiriyanont
- Skin Sciences Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45267-0592, USA, Department of Dermatology, Tokyo Medical University, Japan
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Fésüs L, Sarlós P, Osváth Z, Zsolnai A, Komlósi I, Rátky J. Influence of the dominant white/KIT genotypes on the reproductive organs of pigs. J Reprod Dev 2006; 52:707-13. [PMID: 16960427 DOI: 10.1262/jrd.18029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Based on earlier studies with mice and pigs, the possible pleiotropic effects of the individual porcine Dominant White/KIT genotypes on the size, histological parameters, and surface features of the ovaries; on the size, histological characteristics, and volume of the testes; and on the occurrence of abnormal epididymal sperm cells were studied in two F2 generations of an intercross between Hampshire boars and Hungarian Large White sows. The KIT genotypes were determined by a PCR-RFLP method. The ovarian diameters of gilts of various KIT genotypes did not differ significantly (P=0.292), and the II pigs had the smallest diameters. The proportion of the investigated follicular types among the different KIT genotypes did not differ significantly (P=0.329-0.919), and the highest numbers of degenerated and atretic follicles were found in the ovaries of II genotype pigs, which also exhibited the highest proportion of primary follicles. The testis volume in the II homozygote white genotype boars (249.5 cm(3)) was significantly (P<0.01) larger than in the Ii (205.4 cm(3)) and ii (197.5 cm(3)) boars. Bodyweight and age significantly (P<0.01) affected testicular volume. KIT genotypes had no profound effect on the proportion of the various epididymal sperm abnormalities, and ii type boars showed the highest (nonsignificant) numbers of primary abnormalities. The changes in abnormal sperm cell frequency were linear to the changes in bodyweight and testis volume. We were unable to demonstrate disadvantageous effects of the KIT genotypes on the investigated ovarian, testicular, and epididymal sperm characteristics. Therefore the reproductive traits of white colored pigs examined in this study are no worse than those of pigmented breeds.
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Affiliation(s)
- László Fésüs
- Research Institute for Animal Breeding and Nutrition, Herceghalom, Hungary.
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Hui ES, Udofa EA, Soto J, Vanderhoof VH, Zachman K, Tong ZB, Nelson LM. Investigation of the human stem cell factor KIT ligand gene, KITLG, in women with 46,XX spontaneous premature ovarian failure. Fertil Steril 2006; 85:1502-7. [PMID: 16647379 DOI: 10.1016/j.fertnstert.2005.10.071] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2005] [Revised: 10/11/2005] [Accepted: 10/11/2005] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To investigate mutations in the human KIT ligand gene (KITLG) gene as a mechanism of 46,XX spontaneous premature ovarian failure. The human KIT ligand gene, known also as human stem cell factor, is the ligand of the c-kit transmembrane tyrosine kinase receptor (KIT). This ligand-receptor interaction is known to play important roles in mouse germ cell migration and proliferation. DESIGN Cross-sectional study. SETTING Clinical research center. PATIENT(S) Forty women with 46,XX spontaneous premature ovarian failure. INTERVENTION(S) None. MAIN OUTCOME MEASURE(S) Single-stranded conformational polymorphism analysis and DNA sequencing. RESULT(S) We found one nucleotide change of the KITLG coding region (811G-->T) that led to an alteration of the amino acid composition of the KITLG protein in one Caucasian patient (Asp210Tyr). However, we found the same alteration in two normal control Caucasian samples. Three nucleotide substitutions were found in the noncoding exon of KITLG (exon 10). We also identified two intronic polymorphisms. Thus, we did not identify a single significant mutation in the coding region of the KITLG gene in any of 40 patients (upper 95% confidence limit is 7.2%). CONCLUSION(S) Mutations in the coding regions of the KITLG gene appear not to be a common cause of 46,XX spontaneous premature ovarian failure in North American women.
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Affiliation(s)
- Emily S Hui
- Section on Women's Health Research, Developmental Endocrinology Branch, National Institutes of Health, Bethesda, Maryland, USA
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Tosaki H, Kunisada T, Motohashi T, Aoki H, Yoshida H, Kitajima Y. Mice Transgenic for KitV620A: Recapitulation of Piebaldism but not Progressive Depigmentation Seen in Humans with this Mutation. J Invest Dermatol 2006; 126:1111-8. [PMID: 16456533 DOI: 10.1038/sj.jid.5700173] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Piebaldism is an autosomal dominant genetic pigmentary disorder, characterized by congenital white hair and patches located on the forehead, anterior trunk, and extremities. Most piebald patients have a mutation of the KIT gene, which encodes a tyrosine kinase receptor involved in pigment cell development. The white hair and patches of such patients are already completely formed at birth and do not usually expand thereafter. This stability of pigmented spots also applies to Kit(W) and Kitl(Sl) mutant mice. However, two novel cases of piebaldism were reported in 2001, in which both mother and daughter having a novel Val620Ala mutation in their KIT gene showed progressive depigmentation. To prepare an animal model of this mutation, to explore undefined functions of KIT signaling for maintaining pigmented melanocytes in the skin or more specifically the integrity of the melanocyte stem cell system in the postnatal skin, we produced transgenic mice expressing Val620Ala Kit. These mice well mimicked the white spotting pattern of patients; however, no change in this pattern was observed after birth, even after increasing the transgene expression by various means. Here, we report the unexpectedly extremely stable maintenance of the melanocyte stem cell system under stringent conditions for KIT signaling.
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Affiliation(s)
- Hiroko Tosaki
- Department of Dermatology, Gifu University School of Medicine, Gifu 501-1194, Japan
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