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Babakoohi S, Sipe A, Zamanifekri M, Hunter WD. Small fiber neuropathy in epidermolysis bullosa simplex. JAAD Case Rep 2024; 48:23-25. [PMID: 38741659 PMCID: PMC11090054 DOI: 10.1016/j.jdcr.2024.03.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024] Open
Affiliation(s)
- Shahab Babakoohi
- Atrium Health Levine Cancer Institute, Wake Forest School of Medicine, Charlotte, North Carolina
| | - Amber Sipe
- Caromont Neurology, Gastonia, North Carolina
| | | | - William D. Hunter
- Neuroscience & Spine Center of the Carolinas, Gastonia, North Carolina
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Ali FM, Zhou J, Wang M, Wang Q, Sun L, Mshenga MM, Lu H. Epidermolysis Bullosa: Two rare case reports of COL7A1 and EBS-GEN SEV KRT14 variants with review of literature. BMC Pediatr 2024; 24:242. [PMID: 38580989 PMCID: PMC10996244 DOI: 10.1186/s12887-024-04715-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 03/20/2024] [Indexed: 04/07/2024] Open
Abstract
EPIDERMOLYSIS Bullosa is a rare hereditary skin condition that causes blisters. Genes encoding structural proteins at or near the dermal-epidermal junction are mutated recessively or dominantly, and this is the primary cause of EB. Herein, two Chinese boys were diagnosed with the condition, each with a different variant in a gene that serves as a reference for EB genetic counseling. Skincare significantly impacted their prognosis and quality of life. CASE PRESENTATION Two Chinese boys, with phenotypically normal parents, have been diagnosed with distinct blister symptoms, one with Dominant Dystrophic Epidermolysis Bullosa and the other with a severe form of Epidermolysis Bullosa Simplex. The first patient had a G-to-A variant in the COL7A1 allele, at nucleotide position 6163 which was named "G2055A". The proband is heterozygous for Dystrophic Epidermolysis Bullosa due to a COL7A1 allele with a glycine substitution at the triple helix domain. A similar variant has been discovered in his mother, indicating its potential transmission to future generations. Another patient had severe Epidermolysis Bullosa Simplex with a rare c.377T > A variant resulting in substitution of amino acid p.Leu126Arg (NM_000526.5 (c.377T > G, p.Leu126Arg) in the Keratin 14 gene. In prior literature, Keratin 14 has been associated with an excellent prognosis. However, our patient with this infrequent variant tragically died from sepsis at 21 days old. There has been a reported occurrence of the variant only once. CONCLUSION Our study reveals that Epidermolysis Bullosa patients with COL7A1 c.6163G > A and KRT14 c.377T>A variants have different clinical presentations, with dominant forms of Dystrophic EB having milder phenotypes than recessive ones. Thus, the better prognosis in the c.6163G > A patient. Furthermore, c.377T>A patient was more prone to infection than the patient with c.6163G>A gene variant. Genetic testing is crucial for identifying the specific variant responsible and improving treatment options.
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Affiliation(s)
- Fatma Mabrouk Ali
- Department of Pediatrics, The Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Jieyu Zhou
- Department of Pediatrics, The Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Mingyan Wang
- Department of Pediatrics, The Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Qiuxia Wang
- Department of Pediatrics, The Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Lulu Sun
- Department of Pediatrics, The Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | | | - Hongyan Lu
- Department of Pediatrics, The Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, China.
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Kotalevskaya YY, Stepanov VA. Molecular genetic basis of epidermolysis bullosa. Vavilovskii Zhurnal Genet Selektsii 2023; 27:18-27. [PMID: 36923479 PMCID: PMC10009482 DOI: 10.18699/vjgb-23-04] [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: 10/17/2022] [Revised: 12/10/2022] [Accepted: 12/20/2022] [Indexed: 03/11/2023] Open
Abstract
Epidermolysis bullosa (EB) is an inherited disorder of skin fragility, caused by mutations in a large number of genes associated with skin integrity and dermal-epidermal adhesion. Skin fragility is manifested by a decrease in resistance to external mechanical influences, the clinical signs of which are the formation of blisters, erosions and wounds on the skin and mucous membranes. EB is a multisystemic disease and characterized by a wide phenotypic spectrum with extracutaneous complications in severe types, besides the skin and mucous membranes, with high mortality. More than 30 clinical subtypes have been identified, which are grouped into four main types: simplex EB, junctional EB, dystrophic EB and Kindler syndrome. To date, pathogenic variants in 16 different genes are associated with EB and encode proteins that are part of the skin anchoring structures or are signaling proteins. Genetic mutations cause dysfunction of cellular structures, differentiation, proliferation and apoptosis of cells, leading to mechanical instability of the skin. The formation of reduced proteins or decrease in their level leads mainly to functional disorders, forming mild or intermediate severe phenotypes. Absent protein expression is a result of null genetic variants and leads to structural abnormalities, causing a severe clinical phenotype. For most of the genes involved in the pathogenesis of EB, certain relationships have been established between the type and position of genetic variant and the severity of the clinical manifestations of the disease. Establishing an accurate diagnosis depends on the correlation of clinical, genealogical and immunohistological data in combination with molecular genetic testing. In general, the study of clinical, genetic and ultrastructural changes in EB has significantly expanded the understanding of the natural history of the disease and supplemented the data on genotype-phenotype correlations, promotes the search and study of epigenetic and non-genetic disease modifier factors, and also allows developing approaches to radical treatment of the disease. New advances of sequencing technologies have made it possible to describe new phenotypes and study their genetic and molecular mechanisms. This article describes the pathogenetic aspects and genes that cause main and rare syndromic subtypes of EB.
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Affiliation(s)
- Yu Yu Kotalevskaya
- Moscow Regional Research and Clinical Institute, Moscow, Russia Charitable Foundation "BELA. Butterfly Children", Moscow, Russia
| | - V A Stepanov
- Research Institute of Medical Genetics, Tomsk National Research Medical Center of the Russian Academy of Sciences, Tomsk, Russia
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Targeted NGS in Diagnostics of Genodermatosis Characterized by the Epidermolysis Bullosa Symptom Complex in 268 Russian Children. Int J Mol Sci 2022; 23:ijms232214343. [PMID: 36430820 PMCID: PMC9698894 DOI: 10.3390/ijms232214343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 11/15/2022] [Accepted: 11/16/2022] [Indexed: 11/22/2022] Open
Abstract
The pathogenic variants of genes encoding proteins, participating in the formation and functioning of epidermis and dermo-epidermal junctions, create a large variety of clinical phenotypes from: small localized to severe generalized dermatitis, as well as early, or even, prenatal death due to extensive epidermis loss. The diagnostic panel in this study was developed for the purposes of identifying these pathogenic genetic variants in 268 Russian children, who possessed the epidermolysis bullosa symptom complex in a selection of 247 families. This panel included the targeted areas of 33 genes, which are genetic variants that can lead to the development of the phenotype mentioned above. The usage of next generation sequencing allowed the revelation of 192 various altered alleles (of which 109 alleles were novel, i.e., had not been described previously). In addition, it allowed the definition of the genetic variants that are both typical for most of the examined children and for the separate ethnic groups inhabiting modern Russia. We found that the most characteristic mutations for the Dargin and Chechen ethnic groups are the c.3577del deletion in the COL7A1 gene and the c.2488G>A missense mutation in the COL17A1 gene, respectively. In addition, the study of haplotypes of microsatellite markers, which we managed to conduct in the Dargin population, confirmed the presence of the founder effect.
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Wu Y, Sun Y, Zhang H, Xiao H, Pan A, Shen J, Pu Y, Liang Z, Du J, Pi J. Multiomic analysis revealed the regulatory role of the KRT14 gene in eggshell quality. Front Genet 2022; 13:927670. [PMID: 36212119 PMCID: PMC9536113 DOI: 10.3389/fgene.2022.927670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Accepted: 08/29/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Eggshell strength and thickness are critical factors in reducing the egg breaking rate and preventing economic losses. The calcite biomineralization process is very important for eggshell quality. Therefore, we employed transcriptional sequencing and proteomics to investigate the differences between the uteruses of laying hens with high- and low-breaking-strength shells. Results: A total of 1,028 differentially expressed genes (DEGs) and 270 differentially expressed proteins (DEPs) were identified. The analysis results of GO terms and KEGG pathways showed that most of the DEGs and DEPs were enriched in vital pathways related to processes such as calcium metabolism, hormone and amino acid biosynthesis, and cell proliferation and apoptosis. Several DEGs and DEPs that were coexpressed at mRNA and protein levels were verified. KRT14 (keratin-14) is a candidate gene (protein) obtained by multiple omics analysis due to the fold difference of KRT14 being the largest. After the overexpression of KRT14 in uterine epithelial cells, the expressions of OC116 (ovocleididin-116), CALB1 (calbindin 1), and BST1 (ADP-ribosyl cyclase 2) were found to be increased significantly, while the expression of OC17 (ovocleididin-17) was found to be decreased significantly. Conclusion: In summary, this study confirms that during normal calcification, there are differences in ion transport between the uterus of hens producing high-breaking-strength eggshells and those producing low-breaking-strength eggshells, which may help elucidate the eggshell calcification process. The KRT14 gene may promote calcium metabolism and deposition of calcium carbonate in eggshells.
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Affiliation(s)
- Yan Wu
- Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Science, Wuhan, China
- Hubei Key Laboratory of Animal Embryo and Molecular Breeding, Wuhan, China
| | - Yanyan Sun
- Institute of Animal Sciences of CAAS, Beijing, China
| | - Hao Zhang
- Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Science, Wuhan, China
| | - Hongwei Xiao
- Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Science, Wuhan, China
| | - Ailuan Pan
- Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Science, Wuhan, China
| | - Jie Shen
- Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Science, Wuhan, China
| | - Yuejin Pu
- Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Science, Wuhan, China
| | - Zhenhua Liang
- Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Science, Wuhan, China
| | - Jinping Du
- Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Science, Wuhan, China
| | - Jinsong Pi
- Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Science, Wuhan, China
- *Correspondence: Jinsong Pi,
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Paduano F, Colao E, Grillone T, Vismara MFM, Amato R, Nisticò S, Mignogna C, Dastoli S, Fabiani F, Zucco R, Trapasso F, Perrotti N, Iuliano R. A Familial Form of Epidermolysis Bullosa Simplex Associated with a Pathogenic Variant in KRT5. Genes (Basel) 2021; 12:genes12101503. [PMID: 34680898 PMCID: PMC8535670 DOI: 10.3390/genes12101503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 09/16/2021] [Accepted: 09/19/2021] [Indexed: 12/21/2022] Open
Abstract
Epidermolysis bullosa simplex is a disease that belongs to a group of genodermatoses characterised by the formation of superficial bullous lesions caused by minor mechanical trauma to the skin. The skin fragility observed in the EBS is mainly caused by pathogenic variants in the KRT5 and KRT14 genes that compromise the mechanical stability of epithelial cells. By performing DNA sequencing in a female patient with EBS, we found the pathogenic variant c.967G>A (p.Val323Met) in the KRT5 gene. This variant co-segregated with EBS in the family pedigree and was transmitted in an autosomal dominant inheritance manner. This is the first report showing a familial form of EBS due to this pathogenic variant.
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Affiliation(s)
- Francesco Paduano
- Medical Genetics Unit, Mater Domini University Hospital, 88100 Catanzaro, Italy; (E.C.); (T.G.); (M.F.M.V.); (R.A.); (F.F.); (F.T.); (N.P.)
- Department of Health Sciences, Campus S. Venuta, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy; (S.N.); (C.M.); (S.D.); (R.Z.)
- Tecnologica Research Institute and Marrelli Health, Biomedical Section, Stem Cells and Medical Genetics Units, 88900 Crotone, Italy
- Correspondence: (F.P.); (R.I.)
| | - Emma Colao
- Medical Genetics Unit, Mater Domini University Hospital, 88100 Catanzaro, Italy; (E.C.); (T.G.); (M.F.M.V.); (R.A.); (F.F.); (F.T.); (N.P.)
| | - Teresa Grillone
- Medical Genetics Unit, Mater Domini University Hospital, 88100 Catanzaro, Italy; (E.C.); (T.G.); (M.F.M.V.); (R.A.); (F.F.); (F.T.); (N.P.)
| | - Marco Flavio Michele Vismara
- Medical Genetics Unit, Mater Domini University Hospital, 88100 Catanzaro, Italy; (E.C.); (T.G.); (M.F.M.V.); (R.A.); (F.F.); (F.T.); (N.P.)
| | - Rosario Amato
- Medical Genetics Unit, Mater Domini University Hospital, 88100 Catanzaro, Italy; (E.C.); (T.G.); (M.F.M.V.); (R.A.); (F.F.); (F.T.); (N.P.)
- Department of Health Sciences, Campus S. Venuta, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy; (S.N.); (C.M.); (S.D.); (R.Z.)
| | - Steven Nisticò
- Department of Health Sciences, Campus S. Venuta, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy; (S.N.); (C.M.); (S.D.); (R.Z.)
| | - Chiara Mignogna
- Department of Health Sciences, Campus S. Venuta, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy; (S.N.); (C.M.); (S.D.); (R.Z.)
| | - Stefano Dastoli
- Department of Health Sciences, Campus S. Venuta, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy; (S.N.); (C.M.); (S.D.); (R.Z.)
| | - Fernanda Fabiani
- Medical Genetics Unit, Mater Domini University Hospital, 88100 Catanzaro, Italy; (E.C.); (T.G.); (M.F.M.V.); (R.A.); (F.F.); (F.T.); (N.P.)
| | - Rossella Zucco
- Department of Health Sciences, Campus S. Venuta, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy; (S.N.); (C.M.); (S.D.); (R.Z.)
| | - Francesco Trapasso
- Medical Genetics Unit, Mater Domini University Hospital, 88100 Catanzaro, Italy; (E.C.); (T.G.); (M.F.M.V.); (R.A.); (F.F.); (F.T.); (N.P.)
- Department of Experimental and Clinical Medicine, Campus S. Venuta, University Magna Graecia of Catanzaro, Viale Europa, 88100 Catanzaro, Italy
| | - Nicola Perrotti
- Medical Genetics Unit, Mater Domini University Hospital, 88100 Catanzaro, Italy; (E.C.); (T.G.); (M.F.M.V.); (R.A.); (F.F.); (F.T.); (N.P.)
- Department of Health Sciences, Campus S. Venuta, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy; (S.N.); (C.M.); (S.D.); (R.Z.)
| | - Rodolfo Iuliano
- Medical Genetics Unit, Mater Domini University Hospital, 88100 Catanzaro, Italy; (E.C.); (T.G.); (M.F.M.V.); (R.A.); (F.F.); (F.T.); (N.P.)
- Department of Health Sciences, Campus S. Venuta, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy; (S.N.); (C.M.); (S.D.); (R.Z.)
- Correspondence: (F.P.); (R.I.)
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Bchetnia M, Bouchard L, Mathieu J, Campeau PM, Morin C, Brisson D, Laberge AM, Vézina H, Gaudet D, Laprise C. Genetic burden linked to founder effects in Saguenay-Lac-Saint-Jean illustrates the importance of genetic screening test availability. J Med Genet 2021; 58:653-665. [PMID: 33910931 PMCID: PMC8479736 DOI: 10.1136/jmedgenet-2021-107809] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/27/2021] [Accepted: 04/14/2021] [Indexed: 01/02/2023]
Abstract
The Saguenay–Lac-Saint-Jean (SLSJ) region located in the province of Quebec was settled in the 19th century by pioneers issued from successive migration waves starting in France in the 17th century and continuing within Quebec until the beginning of the 20th century. The genetic structure of the SLSJ population is considered to be the product of a triple founder effect and is characterised by a higher prevalence of some rare genetic diseases. Several studies were performed to elucidate the historical, demographic and genetic background of current SLSJ inhabitants to assess the origins of these rare disorders and their distribution in the population. Thanks to the development of new sequencing technologies, the genes and the variants responsible for the most prevalent conditions were identified. Combined with other resources such as the BALSAC population database, identifying the causal genes and the pathogenic variants allowed to assess the impacts of some of these founder mutations on the population health and to design precision medicine public health strategies based on carrier testing. Furthermore, it stimulated the establishment of many public programmes. We report here a review and an update of a subset of inherited disorders and founder mutations in the SLSJ region. Data were collected from published scientific sources. This work expands the knowledge about the current frequencies of these rare disorders, the frequencies of other rare genetic diseases in this population, the relevance of the carrier tests offered to the population, as well as the current available treatments and research about future therapeutic avenues for these inherited disorders.
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Affiliation(s)
- Mbarka Bchetnia
- Département des sciences fondamentales, Université du Québec à Chicoutimi, Chicoutimi, Québec, Canada.,Centre intersectoriel en santé durable (CISD), Université du Québec à Chicoutimi, Chicoutimi, Québec, Canada
| | - Luigi Bouchard
- Département de biochimie et de génomique fonctionnelle, Université de Sherbrooke, Sherbrooke, Québec, Canada.,Centre intégré universitaire de santé et de services sociaux du Saguenay-Lac-Saint-Jean, Hôpital de Chicoutimi, Chicoutimi, Québec, Canada
| | - Jean Mathieu
- Centre intégré universitaire de santé et de services sociaux du Saguenay-Lac-Saint-Jean, Hôpital de Chicoutimi, Chicoutimi, Québec, Canada.,Centre intégré universitaire de santé et de services sociaux du Saguenay-Lac-Saint-Jean, Clinique de maladies neuromusculaires, Jonquière, Québec, Canada
| | - Philippe M Campeau
- Centre Hospitalier universitaire Sainte-Justine, Université de Montréal, Montreal, Québec, Canada
| | - Charles Morin
- Centre intersectoriel en santé durable (CISD), Université du Québec à Chicoutimi, Chicoutimi, Québec, Canada.,Centre intégré universitaire de santé et de services sociaux du Saguenay-Lac-Saint-Jean, Hôpital de Chicoutimi, Chicoutimi, Québec, Canada
| | - Diane Brisson
- ECOGENE-21 et le département de médecine, Université de Montréal, Montreal, Québec, Canada
| | - Anne-Marie Laberge
- Centre Hospitalier universitaire Sainte-Justine, Université de Montréal, Montreal, Québec, Canada
| | - Hélène Vézina
- Centre intersectoriel en santé durable (CISD), Université du Québec à Chicoutimi, Chicoutimi, Québec, Canada.,Département des sciences humaines et sociales, Université du Québec à Chicoutimi, Chicoutimi, Québec, Canada
| | - Daniel Gaudet
- ECOGENE-21 et le département de médecine, Université de Montréal, Montreal, Québec, Canada
| | - Catherine Laprise
- Département des sciences fondamentales, Université du Québec à Chicoutimi, Chicoutimi, Québec, Canada .,Centre intersectoriel en santé durable (CISD), Université du Québec à Chicoutimi, Chicoutimi, Québec, Canada
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Rossi S, Castiglia D, Pisaneschi E, Diociaiuti A, Stracuzzi A, Cesario C, Mariani R, Floriddia G, Zambruno G, Boldrini R, Abeni D, Novelli A, Alaggio R, El Hachem M. Immunofluorescence mapping, electron microscopy and genetics in the diagnosis and sub-classification of inherited epidermolysis bullosa: a single-centre retrospective comparative study of 87 cases with long-term follow-up. J Eur Acad Dermatol Venereol 2021; 35:1007-1016. [PMID: 33274474 DOI: 10.1111/jdv.17060] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 11/17/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND Epidermolysis bullosa (EB) comprises a heterogeneous group of skin fragility disorders, classified in four major types based on skin cleavage level, i.e. EB simplex (EBS), junctional EB (JEB), dystrophic EB (DEB), Kindler EB, and in more than 30 subtypes defined by the combination of laboratory and clinical data, including disease course. OBJECTIVES Our aims were to address whether, in the age of genomics, electron microscopy (TEM) has still a role in diagnosing EB, and whether the genotype per se may be sufficient to sub-classify EB. METHODS A thoroughly characterized single-centre EB case series was retrospectively evaluated to compare the power of TEM with immunofluorescence mapping (IFM) in establishing the EB type, and the ability of TEM, IFM and genetics to predict selected EB subtypes, i.e. severe dominant EBS (DEBS), severe JEB, severe recessive DEB (RDEB) and DEB self-improving, using genetic and final diagnosis, respectively, as gold standard. RESULTS The series consisted of 87 patients, including 44 newborns, with a median follow-up of 54 months. Ninety-five mutations were identified in EB-associated genes, including 25 novel variants. Both IFM and TEM were diagnostic in about all cases of JEB (21/21 for both) and DEB (43/44 for IFM, 44/44 for TEM). TEM sensitivity was superior to IFM for EBS (19/20 vs. 16/19). As to EB subtyping, IFM performed better than genetics in identifying severe JEB cases due to laminin-332 defect (14/14 vs. 10/14) and severe RDEB (eight/nine vs. seven/nine). Genetics had no role in self-improving DEB diagnosis; it almost equalled TEM in predicting severe DEBS (eight/nine vs. nine/nine) and enabled to discriminate dominant from recessive non-severe DEB phenotypes and to identify special subtypes, e.g. DEBS with KLHL24 mutations. CONCLUSIONS Transmission electron microscopy remains relevant to the diagnosis of EBS. IFM and genetics are essential and complementary tools in the vast majority of EB cases.
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Affiliation(s)
- S Rossi
- Pathology Unit, Department of Laboratories, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | | | - E Pisaneschi
- Laboratory of Medical Genetics, Department of Laboratories, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - A Diociaiuti
- Dermatology Department, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - A Stracuzzi
- Pathology Unit, Department of Laboratories, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - C Cesario
- Laboratory of Medical Genetics, Department of Laboratories, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - R Mariani
- Pathology Unit, Department of Laboratories, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | | | - G Zambruno
- Genetics and Rare Diseases Research Division, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - R Boldrini
- Pathology Unit, Department of Laboratories, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | | | - A Novelli
- Laboratory of Medical Genetics, Department of Laboratories, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - R Alaggio
- Pathology Unit, Department of Laboratories, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - M El Hachem
- Dermatology Department, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
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Molecular Modeling of Pathogenic Mutations in the Keratin 1B Domain. Int J Mol Sci 2020; 21:ijms21186641. [PMID: 32927888 PMCID: PMC7555247 DOI: 10.3390/ijms21186641] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 09/06/2020] [Accepted: 09/07/2020] [Indexed: 12/29/2022] Open
Abstract
Keratin intermediate filaments constitute the primary cytoskeletal component of epithelial cells. Numerous human disease phenotypes related to keratin mutation remain mechanistically elusive. Our recent crystal structures of the helix 1B heterotetramer from keratin 1/10 enabled further investigation of the effect of pathologic 1B domain mutations on keratin structure. We used our highest resolution keratin 1B structure as a template for homology-modeling the 1B heterotetramers of keratin 5/14 (associated with blistering skin disorders), keratin 8/18 (associated with liver disease), and keratin 74/28 (associated with hair disorder). Each structure was examined for the molecular alterations caused by incorporating pathogenic 1B keratin mutations. Structural modeling indicated keratin 1B mutations can harm the heterodimer interface (R265PK5, L311RK5, R211PK14, I150VK18), the tetramer interface (F231LK1, F274SK74), or higher-order interactions needed for mature filament formation (S233LK1, L311RK5, Q169EK8, H128LK18). The biochemical changes included altered hydrophobic and electrostatic interactions, and altered surface charge, hydrophobicity or contour. Together, these findings advance the genotype-structurotype-phenotype correlation for keratin-based human diseases.
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Bchetnia M, Allard JP, Boucher-Lafleur AM, Cruz Marino T, Dupéré A, Powell J, McCuaig C, Bernier MÈ, Laprise C. Severe epidermolysis bullosa simplex phenotype caused by codominant mutations p.Ile377Thr in keratin 14 and p.Gly138Glu in keratin 5. Exp Dermatol 2020; 29:961-969. [PMID: 32885477 DOI: 10.1111/exd.14189] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 07/28/2020] [Accepted: 08/24/2020] [Indexed: 12/22/2022]
Abstract
Epidermolysis bullosa simplex (EBS) is a rare skin disease usually inherited in an autosomal dominant pattern. EBS is resulting from mutations in keratin 5 (KRT5) and keratin 14 (KRT14) genes encoding the keratins 5 and 14 proteins expressed in the keratinocytes of the basal layer of the epidermis. To date, seven pathogenic mutations have been reported to be responsible for EBS in the Canadian population from the province of Quebec: p.Pro25Leu, p.Leu150Pro, p.Met327Thr and p.Arg559X in KRT5; p.Arg125Ser, p.Ile377Thr and p.Ile412Phe in KRT14. Here, we present a novel French-Canadian patient diagnosed with EBS confined to the soles but presenting a severe complication form including blisters, hyperkeratosis, skin erosions and toenail abnormalities. Mutation screening was performed by direct sequencing of the entire coding regions of KRT5 and KRT14 genes and revealed the previously reported missense heterozygous mutation c. 1130T > C in KRT14 (p.Ile377Thr). Furthermore, this patient is carrying a second mutation in KRT5, c.413G > A (p.Gly138Glu), which has been linked to an increased risk of basal cell carcinoma in the literature. We suspect an impact of the p.Gly138Glu variant on the EBS phenotype severity of the studied patient. The pathogenicity and consequences of both genetic variations were simulated by in silico tools.
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Affiliation(s)
- Mbarka Bchetnia
- Centre intersectoriel en santé durable, Département des sciences fondamentales, Université du Québec à Chicoutimi (UQAC), Saguenay, QC, Canada
| | - Jean-Pascal Allard
- Centre intégré universitaire de santé et de services sociaux du Saguenay-Lac-Saint-Jean, Saguenay, QC, Canada
| | - Anne-Marie Boucher-Lafleur
- Centre intersectoriel en santé durable, Département des sciences fondamentales, Université du Québec à Chicoutimi (UQAC), Saguenay, QC, Canada
| | - Tania Cruz Marino
- Centre intégré universitaire de santé et de services sociaux du Saguenay-Lac-Saint-Jean, Saguenay, QC, Canada
| | - Audrey Dupéré
- Centre intégré universitaire de santé et de services sociaux du Saguenay-Lac-Saint-Jean, Saguenay, QC, Canada
| | - Julie Powell
- Centre Hospitalier Universitaire Sainte-Justine, Université de Montréal, Montréal, QC, Canada
| | - Catherine McCuaig
- Centre Hospitalier Universitaire Sainte-Justine, Université de Montréal, Montréal, QC, Canada
| | - Marie-Ève Bernier
- Centre intégré universitaire de santé et de services sociaux du Saguenay-Lac-Saint-Jean, Saguenay, QC, Canada
| | - Catherine Laprise
- Centre intersectoriel en santé durable, Département des sciences fondamentales, Université du Québec à Chicoutimi (UQAC), Saguenay, QC, Canada.,Centre intégré universitaire de santé et de services sociaux du Saguenay-Lac-Saint-Jean, Saguenay, QC, Canada
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11
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Dettwiler M, Leuthard F, Bauer A, Jagannathan V, Lourenço AM, Pereira H, Leeb T, Welle MM. A nonsense variant in the KRT14 gene in a domestic shorthair cat with epidermolysis bullosa simplex. Anim Genet 2020; 51:829-832. [PMID: 32657488 DOI: 10.1111/age.12979] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/15/2020] [Indexed: 12/27/2022]
Abstract
Epidermolysis bullosa simplex (EBS) is a hereditary blistering disease affecting the skin and mucous membranes. It has been reported in humans, cattle, buffaloes and dogs, but so far not in cats. In humans, EBS is most frequently caused by variants in the KRT5 or KRT14 genes. Here, we report a case of feline epidermolysis bullosa simplex and describe the causative genetic variant. An 11-month-old male domestic shorthair cat presented with a history of sloughed paw pads and ulcerations in the oral cavity and inner aspect of the pinnae, starting a few weeks after birth. Clinical and histopathological findings suggested a congenital blistering disease with a split formation within the basal cell layer of the epidermis and oral mucous epithelium. The genetic investigation revealed a homozygous nonsense variant in the KRT14 gene (c.979C>T, p.Gln327*). Immunohistochemistry showed a complete absence of keratin 14 staining in all epithelia present in the biopsy. To the best of our knowledge, this is the first report of feline EBS, and the first report of a spontaneous pathogenic KRT14 variant in a non-human species. The homozygous genotype in the affected cat suggests an autosomal recessive mode of inheritance.
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Affiliation(s)
- M Dettwiler
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, Bern, 3001, Switzerland.,Dermfocus, Vetsuisse Faculty, University of Bern, Bern, 3001, Switzerland
| | - F Leuthard
- Dermfocus, Vetsuisse Faculty, University of Bern, Bern, 3001, Switzerland.,Institute of Genetics, Vetsuisse Faculty, University of Bern, Bremgartenstrasse 109a, Bern, 3001, Switzerland
| | - A Bauer
- Dermfocus, Vetsuisse Faculty, University of Bern, Bern, 3001, Switzerland.,Institute of Genetics, Vetsuisse Faculty, University of Bern, Bremgartenstrasse 109a, Bern, 3001, Switzerland
| | - V Jagannathan
- Dermfocus, Vetsuisse Faculty, University of Bern, Bern, 3001, Switzerland.,Institute of Genetics, Vetsuisse Faculty, University of Bern, Bremgartenstrasse 109a, Bern, 3001, Switzerland
| | - A M Lourenço
- Dermatology Service, Faculty of Veterinary Medicine, Centre for Interdisciplinary Research in Animal Health, University of Lisbon, Av. Universidade Técnica, Lisboa, 1300-477, Portugal
| | - H Pereira
- Dermatology Service, Faculty of Veterinary Medicine, Centre for Interdisciplinary Research in Animal Health, University of Lisbon, Av. Universidade Técnica, Lisboa, 1300-477, Portugal
| | - T Leeb
- Dermfocus, Vetsuisse Faculty, University of Bern, Bern, 3001, Switzerland.,Institute of Genetics, Vetsuisse Faculty, University of Bern, Bremgartenstrasse 109a, Bern, 3001, Switzerland
| | - M M Welle
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, Bern, 3001, Switzerland.,Dermfocus, Vetsuisse Faculty, University of Bern, Bern, 3001, Switzerland
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12
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Mariath LM, Santin JT, Schuler-Faccini L, Kiszewski AE. Inherited epidermolysis bullosa: update on the clinical and genetic aspects. An Bras Dermatol 2020; 95:551-569. [PMID: 32732072 PMCID: PMC7563003 DOI: 10.1016/j.abd.2020.05.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Accepted: 05/17/2020] [Indexed: 12/14/2022] Open
Abstract
Inherited epidermolysis bullosa is a group of genetic diseases characterized by skin fragility and blistering on the skin and mucous membranes in response to minimal trauma. Epidermolysis bullosa is clinically and genetically very heterogeneous, being classified into four main types according to the layer of skin in which blistering occurs: epidermolysis bullosa simplex (intraepidermal), junctional epidermolysis bullosa (within the lamina lucida of the basement membrane), dystrophic epidermolysis bullosa (below the basement membrane), and Kindler epidermolysis bullosa (mixed skin cleavage pattern). Furthermore, epidermolysis bullosa is stratified into several subtypes, which consider the clinical characteristics, the distribution of the blisters, and the severity of cutaneous and extracutaneous signs. Pathogenic variants in at least 16 genes that encode proteins essential for the integrity and adhesion of skin layers have already been associated with different subtypes of epidermolysis bullosa. The marked heterogeneity of the disease, which includes phenotypes with a broad spectrum of severity and many causal genes, hinders its classification and diagnosis. For this reason, dermatologists and geneticists regularly review and update the classification criteria. This review aimed to update the state of the art on inherited epidermolysis bullosa, with a special focus on the associated clinical and genetic aspects, presenting data from the most recent reclassification consensus, published in 2020.
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Affiliation(s)
- Luiza Monteavaro Mariath
- Postgraduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Juliana Tosetto Santin
- Postgraduate Program in Child and Adolescent Health, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil; Dermatology Service, Santa Casa de Misericórdia de Porto Alegre/Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brazil
| | | | - Ana Elisa Kiszewski
- Dermatology Service, Santa Casa de Misericórdia de Porto Alegre/Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brazil; Department of Clinical Medicine, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brazil; Pediatric Dermatology Unit, Santa Casa de Misericórdia de Porto Alegre/Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brazil.
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13
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Mariath LM, Santin JT, Frantz JA, Doriqui MJR, Schuler-Faccini L, Kiszewski AE. Genotype-phenotype correlations on epidermolysis bullosa with congenital absence of skin: A comprehensive review. Clin Genet 2020; 99:29-41. [PMID: 32506467 DOI: 10.1111/cge.13792] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 05/25/2020] [Accepted: 05/30/2020] [Indexed: 02/06/2023]
Abstract
Congenital absence of skin (CAS) is a clinical sign associated with the main types of epidermolysis bullosa (EB). Very few studies have investigated the genetic background that may influence the occurrence of this condition. Our objective was to investigate genotype-phenotype correlations on EB with CAS through a literature revision on the pathogenic variants previously reported. A total of 171 cases (49 EB simplex, EBS; 23 junctional EB, JEB; and 99 dystrophic EB, DEB), associated with 132 pathogenic variants in eight genes, were included in the genotype-phenotype analysis. In EBS, CAS showed to be a recurrent clinical sign in EBS with pyloric atresia (PA) and EBS associated with kelch-like protein 24; CAS was also described in patients with keratins 5/14 alterations, particularly involving severe phenotypes. In JEB, this is a common clinical sign in JEB with PA associated with premature termination codon variants and/or amino acid substitutions located in the extracellular domain of integrin α6β4 genes. In DEB with CAS, missense variants occurring close to non-collagenous interruptions of the triple-helix domain of collagen VII appear to influence this condition. This study is the largest review of patients with EB and CAS and expands the spectrum of known variants on this phenomenon.
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Affiliation(s)
- Luiza Monteavaro Mariath
- Postgraduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Juliana Tosetto Santin
- Postgraduate Program in Child and Adolescent Health, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Jeanine Aparecida Frantz
- Faculty of Medicine, Universidade Regional de Blumenau, Blumenau, Brazil.,Board of Directors, Debra-Brasil, Blumenau, Brazil
| | | | - Lavínia Schuler-Faccini
- Postgraduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Department of Genetics, Universidade Federal do Rio Grande do Sul and Instituto Nacional de Ciência e Tecnologia de Genética Médica Populacional (INaGeMP), Porto Alegre, Brazil
| | - Ana Elisa Kiszewski
- Section of Dermatology, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, Brazil.,Section of Pediatric Dermatology, Hospital da Criança Santo Antônio, Irmandade da Santa Casa de Misericórdia de Porto Alegre, Porto Alegre, Brazil
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14
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Chen F, Huang L, Li C, Zhang J, Yang W, Zhang B, Li H, Deng D, Liang J, Shen J, Yao Z, Li M. Next-generation sequencing through multigene panel testing for the diagnosis of hereditary epidermolysis bullosa in Chinese population. Clin Genet 2020; 98:179-184. [PMID: 32484238 DOI: 10.1111/cge.13791] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 05/17/2020] [Accepted: 05/28/2020] [Indexed: 01/10/2023]
Abstract
Epidermolysis bullosa (EB) is a heritable blistering disorder. We performed a next-generation sequencing-based multigene panel test and successfully predicted 100% of the EB types, including, 36 EB simplex (EBS), 13 junctional EB (JEB), 86 dystrophic EB (DEB), and 3 Kindler EB. Chinese JEB and recessive DEB (RDEB) patients have relatively mild phenotypes; for severe type separately accounts for 45.5% and 23.8%, respectively. We identified 96 novel and 49 recurrent pathogenic variants in 11 genes, although we failed to detect the second mutation in one JEB and five RDEB patients. We identified one novel p.E475K mosaic mutation in the clinically normal mother of one out of 13 EBS patients with KRT5 mutations, one recurrent p.G2034R mosaic mutation, and one novel p.G2043R mosaic mutation in the clinically normal relatives of two out of 19 dominant DEB patients. This study shows that next-generation technology could be an effective tool in diagnosing EB.
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Affiliation(s)
- Fuying Chen
- Department of Dermatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Institute of Dermatology, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Linting Huang
- Department of Dermatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Institute of Dermatology, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Changcan Li
- Department of General Surgery, Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Jia Zhang
- Department of Dermatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Institute of Dermatology, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Weiqin Yang
- Department of Dermatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Beibei Zhang
- Department of Dermatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Huaguo Li
- Department of Dermatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Institute of Dermatology, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Dan Deng
- Department of Dermatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Institute of Dermatology, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Jianying Liang
- Department of Dermatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Institute of Dermatology, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Jinwen Shen
- Department of Dermatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Institute of Dermatology, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Zhirong Yao
- Department of Dermatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Institute of Dermatology, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Ming Li
- Department of Dermatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.,Institute of Dermatology, Shanghai Jiaotong University School of Medicine, Shanghai, China
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15
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Severe Generalized Epidermolysis Bullosa Simplex in Two Hong Kong Children due to De Novo Variants in KRT14 and KRT5. Case Rep Pediatr 2020; 2020:4206348. [PMID: 32351751 PMCID: PMC7183525 DOI: 10.1155/2020/4206348] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 03/19/2020] [Indexed: 11/18/2022] Open
Abstract
We report two Hong Kong children with severe generalized epidermolysis bullosa simplex (EBS), the most severe form of EBS, without a family history of EBS. EBS is a rare genodermatosis usually inherited in an autosomal dominant fashion although rare autosomal recessive cases have been reported. Genetic studies in these patients showed that the first case was due to a novel de novo heterozygous variant, c.377T>G (NM_000526.5 (c.377T>G, p.Leu126Arg)) in the KRT14 gene and the second case was due to a rare de novo heterozygous variant c.527A>G (NM_000424.4, c.527A>G, p.Asn176Ser) in the KRT5 gene. To our knowledge, the c.377T>G variant in the KRT14 gene has not been previously reported, and the c.527A>G variant in the KRT5 gene is a rare cause of severe generalized EBS. In severe generalized EBS, infants exhibit severe symptoms at the onset; however, they tend to improve with time. A precise genetic diagnosis in these two cases aided in counseling the families concerning the prognosis in their affected children and the recurrence risk for future pregnancies.
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16
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Liu M, Zhang J, Wang Y, Xin C, Ma J, Xu S, Wang X, Gao J, Zhang X, Yang S. Non‑invasive proteome‑wide quantification of skin barrier‑related proteins using label‑free LC‑MS/MS analysis. Mol Med Rep 2020; 21:2227-2235. [PMID: 32186761 PMCID: PMC7115193 DOI: 10.3892/mmr.2020.11020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 02/06/2020] [Indexed: 12/11/2022] Open
Abstract
A number of epidermal proteins are closely related to skin barrier function, the abnormalities of which can lead to specific skin diseases. These proteins must be quantified to further investigate the changes in the skin barrier between healthy and disease states. However, the non-invasive and proteome-wide quantification of skin proteins without any labelling steps remains a challenge. In this study, 3M medical adhesive tapes were used to obtain skin samples from volunteers. Proteins were extracted from fresh skin samples and digested with trypsin. Each tryptic peptide was analysed in three replicates using liquid chromatography with tandem mass spectrometry analysis and label-free quantification. The data were searched against the Human Universal Protein Resource (UniProt) to match with known proteins. Using this method, 1,157 skin proteins recorded in the UniProt were quantified. A total of 50 identical proteins were identified in the three replicate analyses of all samples with no significant differences in abundance. The results provided an objective metric for further study of skin ageing and various skin diseases. Specifically, the non-invasive proteome-wide method used in this study can be applied to future studies of skin diseases related to barrier destruction by monitoring the changes in the levels of epidermal proteins.
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Affiliation(s)
- Mengting Liu
- Department of Dermatology, The First Affiliated Hospital, Anhui Medical University, Hefei, Anhui 230032, P.R. China
| | - Jing Zhang
- Department of Dermatology, The First Affiliated Hospital, Anhui Medical University, Hefei, Anhui 230032, P.R. China
| | - Yaochi Wang
- Department of Dermatology, The First Affiliated Hospital, Anhui Medical University, Hefei, Anhui 230032, P.R. China
| | - Cong Xin
- Department of Dermatology, The First Affiliated Hospital, Anhui Medical University, Hefei, Anhui 230032, P.R. China
| | - Jie Ma
- Department of Dermatology, The First Affiliated Hospital, Anhui Medical University, Hefei, Anhui 230032, P.R. China
| | - Shuangjun Xu
- Department of Dermatology, The First Affiliated Hospital, Anhui Medical University, Hefei, Anhui 230032, P.R. China
| | - Xiaomeng Wang
- Department of Dermatology, The First Affiliated Hospital, Anhui Medical University, Hefei, Anhui 230032, P.R. China
| | - Jinping Gao
- Department of Dermatology, The First Affiliated Hospital, Anhui Medical University, Hefei, Anhui 230032, P.R. China
| | - Xuejun Zhang
- Department of Dermatology, The First Affiliated Hospital, Anhui Medical University, Hefei, Anhui 230032, P.R. China
| | - Sen Yang
- Department of Dermatology, The First Affiliated Hospital, Anhui Medical University, Hefei, Anhui 230032, P.R. China
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17
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Yalici-Armagan B, Kabacam S, Taskiran ZE, Gököz Ö, Utine GE, Ersoy-Evans S. A novel mutation of keratin 5 in epidermolysis bullosa simplex with migratory circinate erythema. Pediatr Dermatol 2020; 37:358-361. [PMID: 31965605 DOI: 10.1111/pde.14087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Epidermolysis bullosa simplex migratory circinate erythema (EBS-Migr) is an uncommon subtype of EBS. We report a case of EBS-MIGR with a novel heterozygous pathogenic mutation in exon 9 (frameshift deletion c.1650delC) and likely benign heterozygous mutation in exon 2 (missense c.591C > A) of keratin 5. This novel pathogenic mutation in KRT5 expands the molecular spectrum of this rare subtype of EBS.
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Affiliation(s)
- Basak Yalici-Armagan
- Department of Dermatology and Venereology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Serkan Kabacam
- Department of Medical Genetics, Faculty of Medicine, Molecular Biologist, Hacettepe University, Ankara, Turkey
| | - Zihni Ekim Taskiran
- Department of Medical Genetics, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Özay Gököz
- Department of Pathology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Gülen Eda Utine
- Department of Pediatric Genetics, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Sibel Ersoy-Evans
- Department of Dermatology and Venereology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
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18
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Johnson AL, Peterson SM, Terry MML, Ferguson B, Colgin LM, Lewis AD. Spontaneous KRT5 Gene Mutation in Rhesus Macaques ( Macaca mulatta): A Novel Nonhuman Primate Model of Epidermolysis Bullosa Simplex. Vet Pathol 2020; 57:344-348. [PMID: 32096448 DOI: 10.1177/0300985819900354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Epidermolysis bullosa simplex (EBS) is an inherited skin disorder characterized by increased skin and mucous membrane fragility. Most cases are caused by mutations in keratin 5 (KRT5) and keratin 14 (KRT14). Mutations of these genes result in cytoskeletal disruption of the basal keratinocytes. Gross and histopathologic findings of 2 clinically affected homozygous rhesus macaques with an insertion variant mutation in KRT5 are described and compared with 6 deceased phenotypically normal animals that were heterozygous for the KRT5 insertion variant. Animals that were homozygous for the KRT5 insertion variant were stillborn and had widespread loss of the epidermis. Microscopic examination confirmed severe ulceration and basal cell vacuolation with basilar vesicle formation in the remaining intact epidermis. Immunohistochemistry for cytokeratin 5 demonstrated lack of epidermal immunoreactivity in homozygotes. DNA sequencing identified a 34-base pair insertion variant in exon 5 of the KRT5 gene. To our knowledge, this is the first report of epidermolysis bullosa in rhesus macaques.
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Affiliation(s)
- Amanda L Johnson
- Pathology Services Unit, Division of Comparative Medicine, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR, USA
| | - Samuel M Peterson
- Division of Genetics, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR, USA
| | - Margaret M L Terry
- Pathology Services Unit, Division of Comparative Medicine, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR, USA
| | - Betsy Ferguson
- Division of Genetics, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR, USA
| | - Lois M Colgin
- Pathology Services Unit, Division of Comparative Medicine, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR, USA
| | - Anne D Lewis
- Pathology Services Unit, Division of Comparative Medicine, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR, USA
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19
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Yu Y, Mi Z, Fu X, Wang Z, Sun L, Liu H, Zhang F. Digenic inheritance of KRT5 and KRT14 mutations in a family with epidermolysis bullosa simplex. Australas J Dermatol 2020; 61:e267-e269. [PMID: 31919841 DOI: 10.1111/ajd.13236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Yueqian Yu
- School of Medicine and Life Sciences, University of Jinan-Shandong Academy of Medical Sciences, Jinan, Shandong, China.,Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Zihao Mi
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Xi'an Fu
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Zhenzhen Wang
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Lele Sun
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Hong Liu
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Furen Zhang
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong, China
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20
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Zhang J, Ding Y, Li M, Yao Z, Zhuang Y. Known and novel mutations responsible for epidermolysis bullosa simplex cases in a Chinese population. Exp Ther Med 2019; 18:4661-4664. [PMID: 31772641 PMCID: PMC6862070 DOI: 10.3892/etm.2019.8130] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 10/10/2019] [Indexed: 11/20/2022] Open
Abstract
Epidermolysis bullosa simplex, generalized severe (EBS-gen sev) is one of the major forms of EBS, caused by mutations of the keratin 5 (KRT5) or keratin 14 (KRT14). However, it is rarely reported in the Chinese population. The current study was performed on three unrelated Chinese families with five patients clinically suspicious for distinct stages of EBS. Mutation screening was performed by direct sequencing of the entire coding regions of KRT5 and KRT14 genes. A diagnosis of EBS-gen sev for patients in these three families was confirmed by revealing missense mutations c.373C>T (p.Arg125Cys), c.374G>T (p.Arg125Leu), and a novel frameshift mutation c.1231delG (p.Glu411Argfs*31) in KRT14. Considering two previously reported cases and the results of the current report, amino acid residue 125 is likely the most frequent hotspot of EBS-gen sev in the Chinese population. The current study further indicated that the symptoms of EBS-gen sev patients decline with age.
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Affiliation(s)
- Jia Zhang
- Department of Dermatology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200092, P.R. China
| | - Yu Ding
- Dermatology Department, Mianyang Central Hospital, Mianyang, Sichuan 621000, P.R. China
| | - Ming Li
- Department of Dermatology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200092, P.R. China
| | - Zhirong Yao
- Department of Dermatology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200092, P.R. China
| | - Yin Zhuang
- Department of Dermatology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200092, P.R. China
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21
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Has C, Liu L, Bolling MC, Charlesworth AV, El Hachem M, Escámez MJ, Fuentes I, Büchel S, Hiremagalore R, Pohla-Gubo G, van den Akker PC, Wertheim-Tysarowska K, Zambruno G. Clinical practice guidelines for laboratory diagnosis of epidermolysis bullosa. Br J Dermatol 2019; 182:574-592. [PMID: 31090061 PMCID: PMC7064925 DOI: 10.1111/bjd.18128] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/09/2019] [Indexed: 02/06/2023]
Abstract
Linked Comment: https://doi.org/10.1111/bjd.18377. https://doi.org/10.1111/bjd.18829 available online
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Affiliation(s)
- C Has
- Department of Dermatology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - L Liu
- Viapath, St Thomas' Hospital, London, U.K
| | - M C Bolling
- Department of Dermatology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - A V Charlesworth
- Centre de Reference des Maladies Rares de la Peau et des Muqueuses d'Origine Génétique, L'Archet Hôpital, Nice, France
| | - M El Hachem
- Dermatology Unit, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - M J Escámez
- Bioengineering Department at Universidad Carlos III de Madrid (UC3M), Regenerative Medicine Unit at CIEMAT - U714 CIBER on Rare Diseases (ISCIII), Instituto de Investigación Sanitaria Fundación Jiménez Diaz (IISFJD), Madrid, Spain
| | - I Fuentes
- Fundación DEBRA Chile, Santiago, Chile.,Centro de Genética y Genómica, Facultad de Medicina, Clínica Alemana Universidad del Desarrollo, Santiago, Chile
| | - S Büchel
- Department of Dermatology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - R Hiremagalore
- Adjunct Faculty, Centre for Human Genetics and Department of Dermatology and Pediatrics, Manipal Hospital, Bengaluru, India
| | - G Pohla-Gubo
- EB House Austria, Department of Dermatology, University Hospital of the Paracelsus Medical University, Salzburg, Austria
| | - P C van den Akker
- Department of Genetics, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | | | - G Zambruno
- Dermatology Unit, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
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22
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Tryon RK, Tolar J, Preusser SM, Riddle MJ, Keene DR, Bower M, Thyagarajan B, Ebens CL. A homozygous frameshift variant in the KRT5 gene is compatible with life and results in severe recessive epidermolysis bullosa simplex. JAAD Case Rep 2019; 5:576-579. [PMID: 31312705 PMCID: PMC6610641 DOI: 10.1016/j.jdcr.2019.03.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- Rebecca K Tryon
- Department of Genetics, University of Minnesota, Minneapolis, Minnesota.,Department of Pediatrics, Division of Blood and Marrow Transplantation, University of Minnesota, Minneapolis, Minnesota
| | - Jakub Tolar
- Department of Pediatrics, Division of Blood and Marrow Transplantation, University of Minnesota, Minneapolis, Minnesota
| | - Sarah M Preusser
- Department of Pediatrics, Division of Blood and Marrow Transplantation, University of Minnesota, Minneapolis, Minnesota
| | - Megan J Riddle
- Department of Pediatrics, Division of Blood and Marrow Transplantation, University of Minnesota, Minneapolis, Minnesota
| | | | - Matthew Bower
- Department of Genetics, University of Minnesota, Minneapolis, Minnesota.,Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota
| | - Bharat Thyagarajan
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota
| | - Christen L Ebens
- Department of Pediatrics, Division of Blood and Marrow Transplantation, University of Minnesota, Minneapolis, Minnesota
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23
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Mariath LM, Santin JT, Frantz JA, Doriqui MJR, Kiszewski AE, Schuler-Faccini L. An overview of the genetic basis of epidermolysis bullosa in Brazil: discovery of novel and recurrent disease-causing variants. Clin Genet 2019; 96:189-198. [PMID: 31001817 DOI: 10.1111/cge.13555] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 04/01/2019] [Accepted: 04/17/2019] [Indexed: 12/23/2022]
Abstract
Epidermolysis bullosa (EB) is a genodermatosis that encompasses a group of clinically and genetically heterogeneous disorders classified in four major types: EB simplex (EBS), junctional EB (JEB), dystrophic EB (DEB) and Kindler syndrome. Our aim was to characterize recurrent and novel mutations associated to EB in a sample of Brazilian patients. Eighty-seven patients (25 EBS, 4 JEB and 58 DEB) were studied. We performed a next-generation sequencing-based multigene panel through ion torrent technology including 11 genes: KRT5, KRT14, PLEC, TGM5, LAMA3, LAMB3, LAMC2, COL17A1, ITGB4, COL7A1, and FERMT1. A total of 72 different pathogenic or likely pathogenic variants were identified, 32 of them are novel. The causal variant was detected in 82 patients (efficiency of 94.3%). Pathogenic variants in the residue 125 of KRT14 were identified in 32% of all EBS patients. In DEB patients, four COL7A1 variants were quite frequent, some of them clustered in specific Brazilian regions. Our study extends the spectrum of known mutations in EB and describes, for the first time, the genetic profile of EB patients from Brazil.
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Affiliation(s)
- Luiza M Mariath
- Postgraduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Juliana T Santin
- Postgraduate Program in Child and Adolescent Health, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Jeanine A Frantz
- Faculty of Medicine, Universidade Regional de Blumenau, Blumenau, Brazil.,Board of Directors, DEBRA Brasil (Epidermolysis Bullosa Research Association of Brazil), Blumenau, Brazil
| | - Maria J R Doriqui
- Section of Medical Genetics, Hospital Infantil Dr. Juvêncio Mattos, São Luís, Brazil
| | - Ana E Kiszewski
- Section of Dermatology, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, Brazil.,Section of Pediatric Dermatology, Hospital da Criança Santo Antônio, Irmandade da Santa Casa de Misericórdia de Porto Alegre, Porto Alegre, Brazil
| | - Lavínia Schuler-Faccini
- Postgraduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Department of Genetics, Instituto Nacional de Ciência e Tecnologia de Genética Médica Populacional (INaGeMP), Porto Alegre, Brazil
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24
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Wu SS, Hou MX, Feng CM, Liu JX. LJELSR: A Strengthened Version of JELSR for Feature Selection and Clustering. Int J Mol Sci 2019; 20:ijms20040886. [PMID: 30781701 PMCID: PMC6412528 DOI: 10.3390/ijms20040886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 01/11/2019] [Accepted: 02/07/2019] [Indexed: 11/16/2022] Open
Abstract
Feature selection and sample clustering play an important role in bioinformatics. Traditional feature selection methods separate sparse regression and embedding learning. Later, to effectively identify the significant features of the genomic data, Joint Embedding Learning and Sparse Regression (JELSR) is proposed. However, since there are many redundancy and noise values in genomic data, the sparseness of this method is far from enough. In this paper, we propose a strengthened version of JELSR by adding the L₁-norm constraint on the regularization term based on a previous model, and call it LJELSR, to further improve the sparseness of the method. Then, we provide a new iterative algorithm to obtain the convergence solution. The experimental results show that our method achieves a state-of-the-art level both in identifying differentially expressed genes and sample clustering on different genomic data compared to previous methods. Additionally, the selected differentially expressed genes may be of great value in medical research.
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Affiliation(s)
- Sha-Sha Wu
- School of Information Science and Engineering, Qufu Normal University, Rizhao 276826, China.
| | - Mi-Xiao Hou
- School of Information Science and Engineering, Qufu Normal University, Rizhao 276826, China.
| | - Chun-Mei Feng
- School of Information Science and Engineering, Qufu Normal University, Rizhao 276826, China.
- Bio-Computing Research Center, Harbin Institute of Technology, Shenzhen 518055, China.
| | - Jin-Xing Liu
- School of Information Science and Engineering, Qufu Normal University, Rizhao 276826, China.
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25
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Lalor L, Titeux M, Palisson F, Fuentes I, Yubero MJ, Tasanen K, Huilaja L, Has C, Tadini G, Haggstrom AN, Hovnanian A, Lucky AW. Epidermolysis bullosa simplex-generalized severe type due to keratin 5 p.Glu477Lys mutation: Genotype-phenotype correlation and in silico modeling analysis. Pediatr Dermatol 2019; 36:132-138. [PMID: 30515866 DOI: 10.1111/pde.13722] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
BACKGROUND/OBJECTIVES Epidermolysis bullosa is a group of diseases caused by mutations in skin structural proteins. Availability of genetic sequencing makes identification of causative mutations easier, and genotype-phenotype description and correlation are important. We describe six patients with a keratin 5 mutation resulting in a glutamic acid to lysine substitution at position 477 (p.Glu477Lys) who have a distinctive, severe and sometimes fatal phenotype. We also perform in silico modeling to show protein structural changes resulting in instability. METHODS In this case series, we collected clinical data from six patients with this mutation identified from their national or local epidermolysis bullosa databases. We performed in silico modeling of the keratin 5-keratin 14 coil 2B complex using CCBuilder and rendered with Pymol (Schrodinger, LLC, New York, NY). RESULTS Features include aplasia cutis congenita, generalized blistering, palmoplantar keratoderma, onychodystrophy, airway and developmental abnormalities, and a distinctive reticulated skin pattern. Our in silico model of the keratin 5 p.Glu477Lys mutation predicts conformational change and modification of the surface charge of the keratin heterodimer, severely impairing filament stability. CONCLUSIONS Early recognition of the features of this genotype will improve care. In silico analysis of mutated keratin structures provides useful insights into structural instability.
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Affiliation(s)
- Leah Lalor
- Division of Pediatric Dermatology, MCW Department of Dermatology, Milwaukee, Wisconsin
| | - Matthias Titeux
- Laboratory of Genetic Skin Diseases, Inserm UMR1163, Imagine Institute, Paris, France.,University Paris Descartes - Sorbonne Paris Cite, Paris, France
| | - Francis Palisson
- Fundacion DEBRA Chile, Santiago, Chile.,Facultad de Medicina, Clinica Alemana Universidad del Desarrollo, Santiago, Chile
| | - Ignacia Fuentes
- Fundacion DEBRA Chile, Santiago, Chile.,Centro de Genetica y Genomica, Facultad de Medicina, Clinica Alemana Universidad del Desarrollo, Santiago, Chile
| | - María J Yubero
- Fundacion DEBRA Chile, Santiago, Chile.,Facultad de Medicina, Clinica Alemana Universidad del Desarrollo, Santiago, Chile
| | - Kaisa Tasanen
- Department of Dermatology, Pedego Research Unit, Oulu Center for Cell-Matrix Research, MRC Oulu, University of Oulu and Oulu University Hospital, Oulu, Finland
| | - Laura Huilaja
- Department of Dermatology, Pedego Research Unit, Oulu Center for Cell-Matrix Research, MRC Oulu, University of Oulu and Oulu University Hospital, Oulu, Finland
| | - Cristina Has
- Department of Dermatology, Medical Center - University of Freiburg, Freiburg, Germany
| | - Gianluca Tadini
- Pediatric Dermatology, Fondazione IRCC Ca'Granda - Ospedale Maggiore Policlinico di Milano, Milan, Italy
| | - Anita N Haggstrom
- Department of Dermatology and Pediatrics, Indiana University, Indianapolis, Indiana
| | - Alain Hovnanian
- Laboratory of Genetic Skin Diseases, Inserm UMR1163, Imagine Institute, Paris, France.,University Paris Descartes - Sorbonne Paris Cite, Paris, France
| | - Anne W Lucky
- Epidermolysis Bullosa Center, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
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26
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Khani P, Ghazi F, Zekri A, Nasri F, Behrangi E, Aghdam AM, Mirzaei H. Keratins and epidermolysis bullosa simplex. J Cell Physiol 2018; 234:289-297. [PMID: 30078200 DOI: 10.1002/jcp.26898] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Accepted: 06/12/2018] [Indexed: 11/10/2022]
Abstract
Keratin intermediate filaments play an important role in maintaining the integrity of the skin structure. Understanding the importance of this subject is possible with the investigation of keratin defects in epidermolysis bullosa simplex (EBS). Nowadays, in addition to clinical criteria, new molecular diagnostic methods, such as next generation sequencing, can help to distinguish the subgroups of EBS more precisely. Because the most important and most commonly occurring molecular defects in these patients are the defects of keratins 5 and14 (KRT5 and KRT14), comprehending the nature structure of these proteins and their involved processes can be very effective in understanding the pathophysiology of this disease and providing new and effective therapeutic platforms to treat it. Here, we summarized the various aspects of the presence of KRT5 and KRT14 in the epidermis, their relation to the incidence and severity of EBS phenotypes, and the processes with which these proteins can affect them.
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Affiliation(s)
- Pouria Khani
- Department of Medical Genetics and Molecular Biology, Faculty of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran
| | - Farideh Ghazi
- Department of Medical Genetics and Molecular Biology, Faculty of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran
| | - Ali Zekri
- Department of Medical Genetics and Molecular Biology, Faculty of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran
| | - Farzad Nasri
- Department of Medical Immunology, Faculty of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran
| | - Elham Behrangi
- Department of Dermatology and Laser Surgery, Clinical Research Center, Rasoul-e-Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
| | - Arad Mobasher Aghdam
- School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hamed Mirzaei
- Department of Medical Biotechnology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
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27
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He Y, Maier K, Leppert J, Hausser I, Schwieger-Briel A, Weibel L, Theiler M, Kiritsi D, Busch H, Boerries M, Hannula-Jouppi K, Heikkilä H, Tasanen K, Castiglia D, Zambruno G, Has C. Monoallelic Mutations in the Translation Initiation Codon of KLHL24 Cause Skin Fragility. Am J Hum Genet 2016; 99:1395-1404. [PMID: 27889062 DOI: 10.1016/j.ajhg.2016.11.005] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 11/07/2016] [Indexed: 11/28/2022] Open
Abstract
The genetic basis of epidermolysis bullosa, a group of genetic disorders characterized by the mechanically induced formation of skin blisters, is largely known, but a number of cases still remain genetically unsolved. Here, we used whole-exome and targeted sequencing to identify monoallelic mutations, c.1A>G and c.2T>C, in the translation initiation codon of the gene encoding kelch-like protein 24 (KLHL24) in 14 individuals with a distinct skin-fragility phenotype and skin cleavage within basal keratinocytes. Remarkably, mutation c.1A>G occurred de novo and was recurrent in families originating from different countries. The striking similarities of the clinical features of the affected individuals point to a unique and very specific pathomechanism. We showed that mutations in the translation initiation codon of KLHL24 lead to the usage of a downstream translation initiation site with the same reading frame and formation of a truncated polypeptide. The pathobiology was examined in keratinocytes and fibroblasts of the affected individuals and via expression of mutant KLHL24, and we found mutant KLHL24 to be associated with abnormalities of intermediate filaments in keratinocytes and fibroblasts. In particular, KLHL24 mutations were associated with irregular and fragmented keratin 14. Recombinant overexpression of normal KLHL24 promoted keratin 14 degradation, whereas mutant KLHL24 showed less activity than the normal molecule. These findings identify KLHL24 mutations as a cause of skin fragility and identify a role for KLHL24 in maintaining the balance between intermediate filament stability and degradation required for skin integrity.
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Affiliation(s)
- Yinghong He
- Department of Dermatology, University Medical Center Freiburg, Freiburg 79104, Germany
| | - Kristin Maier
- Department of Dermatology, University Medical Center Freiburg, Freiburg 79104, Germany
| | - Juna Leppert
- Department of Dermatology, University Medical Center Freiburg, Freiburg 79104, Germany
| | - Ingrid Hausser
- Department of Pathology, University of Heidelberg, Heidelberg 69120, Germany
| | - Agnes Schwieger-Briel
- Department of Paediatric Dermatology, University Children's Hospital Zurich, Zurich 8091, Switzerland; Department of Dermatology, University Hospital Zurich, Zurich 8091, Switzerland
| | - Lisa Weibel
- Department of Paediatric Dermatology, University Children's Hospital Zurich, Zurich 8091, Switzerland; Department of Dermatology, University Hospital Zurich, Zurich 8091, Switzerland
| | - Martin Theiler
- Department of Paediatric Dermatology, University Children's Hospital Zurich, Zurich 8091, Switzerland; Department of Dermatology, University Hospital Zurich, Zurich 8091, Switzerland
| | - Dimitra Kiritsi
- Department of Dermatology, University Medical Center Freiburg, Freiburg 79104, Germany
| | - Hauke Busch
- Systems Biology of the Cellular Microenvironment Group, Institute of Molecular Medicine and Cell Research, Albert-Ludwigs-University Freiburg, Freiburg 79104, Germany; German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg 69120, Germany; Comprehensive Cancer Center Freiburg, Freiburg 79106, Germany
| | - Melanie Boerries
- Systems Biology of the Cellular Microenvironment Group, Institute of Molecular Medicine and Cell Research, Albert-Ludwigs-University Freiburg, Freiburg 79104, Germany; German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg 69120, Germany; Comprehensive Cancer Center Freiburg, Freiburg 79106, Germany
| | - Katariina Hannula-Jouppi
- Department of Dermatology and Allergology, University of Helsinki and Helsinki University Hospital, Helsinki 00014, Finland; Folkhälsan Institute of Genetics, University of Helsinki, Helsinki 00014, Finland
| | - Hannele Heikkilä
- Department of Dermatology and Allergology, University of Helsinki and Helsinki University Hospital, Helsinki 00014, Finland
| | - Kaisa Tasanen
- Department of Dermatology, PEDEGO Research Unit, Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu 90014, Finland
| | - Daniele Castiglia
- Laboratory of Molecular and Cell Biology, Istituto Dermopatico dell'Immacolata, Istituto di Ricovero e Cura a Carattere Scientifico, Rome 00167, Italy
| | - Giovanna Zambruno
- Genetic and Rare Diseases Research Area, Bambino Gesù Children's Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Rome 00165, Italy
| | - Cristina Has
- Department of Dermatology, University Medical Center Freiburg, Freiburg 79104, Germany.
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28
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Zhang J, Yan M, Liang J, Li M, Yao Z. A novel KRT5 mutation associated with generalized severe epidermolysis bullosa simplex in a 2-year-old Chinese boy. Exp Ther Med 2016; 12:2823-2826. [PMID: 27882080 PMCID: PMC5103693 DOI: 10.3892/etm.2016.3717] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 05/11/2016] [Indexed: 01/09/2023] Open
Abstract
Mutations in keratin 5 (KRT5) or KRT14 genes are responsible for the most severe form of epidermolysis bullosa simplex (EBS), which is EBS generalized severe (EBS-gen sev). To date, only four pathogenic mutations (p.Arg165Ser and p.Lys199Asn in KRT5; p.Arg125Cys and p.Arg125His in KRT14) have been reported to be responsible for EBS-gen sev in the Chinese population. In the present study, a 2-year-old Chinese boy was clinically suspected to suffer from EBS, and thus Sanger sequencing was performed in the extracted genomic DNA samples from the patient, his parents and 100 healthy controls. A novel de novo heterozygous missense mutation c.503A>G (p.Glu168Gly) located at the N-terminal end segment of the 1A domain in KRT5 was identified by molecular analysis. In silico analysis tools were used to predict the pathogenicity of the novel missense mutation. A diagnosis of EBS-gen sev was thus confirmed according to the clinical presentations and molecular results.
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Affiliation(s)
- Jia Zhang
- Department of Dermatology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200092, P.R. China
| | - Ming Yan
- Department of Dermatology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200092, P.R. China
| | - Jianying Liang
- Department of Dermatology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200092, P.R. China
| | - Ming Li
- Department of Dermatology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200092, P.R. China
| | - Zhirong Yao
- Department of Dermatology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200092, P.R. China
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29
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Esposito S, Guez S, Orenti A, Tadini G, Scuvera G, Corti L, Scala A, Biganzoli E, Berti E, Principi N. Autoimmunity and Cytokine Imbalance in Inherited Epidermolysis Bullosa. Int J Mol Sci 2016; 17:E1625. [PMID: 27669234 PMCID: PMC5085658 DOI: 10.3390/ijms17101625] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 09/17/2016] [Accepted: 09/20/2016] [Indexed: 01/09/2023] Open
Abstract
In order to evaluate the serum anti-skin autoantibodies and cytokine concentrations in patients with different epidermolysis bullosa (EB) types and severity, 42 EB patients and 38 controls were enrolled. Serum anti-skin antibodies were significantly higher in the patients than in the controls (p = 0.008, p < 0.001, p < 0.001, p < 0.001 and p < 0.001 for desmoglein 1 (DSG1) desmoglein 3 (DSG3), bullous pemphigoid 180 (BP180), BP230 and type VII collagen (COL7), respectively). The same trend was observed for interleukin (IL)-1β, IL-2, IL-6, IL-10, tumor necrosis factor-β, and interferon-γ (p < 0.001, p < 0.001, p < 0.001, p = 0.008, p < 0.001 and p = 0.002, respectively). Increases in anti-skin antibodies and cytokine concentrations were higher in patients with recessive dystrophic EB than in those with different types of EB, in generalized cases than in localized ones, and in patients with higher Birmingham Epidermolysis Bullosa Severity (BEBS) scores than in those with a lower score. The BEBS score was directly correlated with BP180, BP230, COL7 (p = 0.015, p = 0.008 and p < 0.001, respectively) and IL-6 (p = 0.03), whereas IL-6 appeared significantly associated with DSG1, DSG3, BP180, BP230 and COL7 (p = 0.015, p = 0.023, p = 0.023, p = 0.015 and p = 0.005, respectively). This study showed that autoimmunity and inflammatory responses are frequently activated in EB, mainly in severe forms, suggesting the use of immunosuppressive drugs or biologicals that are active against pro-inflammatory cytokines to reduce clinical signs and symptoms of disease.
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Affiliation(s)
- Susanna Esposito
- Pediatric Highly Intensive Care Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan 20122, Italy.
| | - Sophie Guez
- Pediatric Highly Intensive Care Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan 20122, Italy.
| | - Annalisa Orenti
- Pediatric Highly Intensive Care Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan 20122, Italy.
| | - Gianluca Tadini
- Pediatric Highly Intensive Care Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan 20122, Italy.
- Dermatology Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan 20122, Italy.
| | - Giulietta Scuvera
- Pediatric Highly Intensive Care Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan 20122, Italy.
| | - Laura Corti
- Dermatology Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan 20122, Italy.
| | - Alessia Scala
- Pediatric Highly Intensive Care Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan 20122, Italy.
| | - Elia Biganzoli
- Unit of Medical Statistics, Biometry and Bioinformatics "G.A. Maccacaro", Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan 20122, Italy.
| | - Emilio Berti
- Dermatology Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan 20122, Italy.
| | - Nicola Principi
- Pediatric Highly Intensive Care Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan 20122, Italy.
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30
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Wakiguchi H, Hasegawa S, Maeba S, Kimura S, Ito S, Tateishi H, Ueda K, Ohga S. A Sporadic Neonatal Case of Epidermolysis Bullosa Simplex Generalized Intermediate with KRT5 and KRT14 Gene Mutations. AJP Rep 2016; 6:e108-11. [PMID: 26929861 PMCID: PMC4769090 DOI: 10.1055/s-0035-1570386] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Background Epidermolysis bullosa simplex (EBS) is a rare genodermatosis resulting from multiple gene mutations, including KRT5 and KRT14. The clinical expression of the mechanobullous skin fragility disease has not been fully explained by the genotype. Case Description An 11-day-old Japanese newborn infant was hospitalized because of herpetiform skin blistering on the feet, which expanded systemically after birth. There was no evidence of virus infection. The biopsied skin lesion showed a blister on the lamina densa without keratin clumps, indicating a diagnosis of EBS-generalized intermediate. We punctured the blisters to remove the contents daily, which led to no exacerbation or infection. The genetic study determined that the patient carried double substitutions of KRT5 c.1424A > G (p.E475G) and KRT14 c.1237G > A (p.A413T). The asymptomatic mother and sister carried the KRT14 substitution, but the healthy father had no substitution of the KRT gene. Conclusion This is the first report of EBS-generalized intermediate in a newborn with de novo KRT5 gene mutation and KRT14 gene polymorphism, and no familial history of epidermolysis. Neonatal blistering due to EBS requires optimal skin management after excluding infectious and immunobullous diseases.
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Affiliation(s)
- Hiroyuki Wakiguchi
- Department of Pediatrics, Graduate School of Medicine, Yamaguchi University, Ube, Yamaguchi, Japan
| | - Shunji Hasegawa
- Department of Pediatrics, Graduate School of Medicine, Yamaguchi University, Ube, Yamaguchi, Japan
| | - Shinji Maeba
- Department of Pediatrics, Graduate School of Medicine, Yamaguchi University, Ube, Yamaguchi, Japan
| | - Sasagu Kimura
- Department of Pediatrics, Graduate School of Medicine, Yamaguchi University, Ube, Yamaguchi, Japan
| | - Satoko Ito
- Division of Pediatrics, JCHO Tokuyama Central Hospital, Shunan, Yamaguchi, Japan
| | - Hiroshi Tateishi
- Division of Pediatrics, JCHO Tokuyama Central Hospital, Shunan, Yamaguchi, Japan
| | - Kazuhiro Ueda
- Division of Pediatrics, Michigami Hospital, Hikari, Yamaguchi, Japan
| | - Shouichi Ohga
- Department of Pediatrics, Graduate School of Medicine, Yamaguchi University, Ube, Yamaguchi, Japan
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31
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Esposito S, Guez S, Manzoni F, Bosco A, Rigante D. Epidermolysis bullosa and the partnership with autoimmunity: what should we assimilate? Immunol Res 2015; 61:63-9. [PMID: 25412732 DOI: 10.1007/s12026-014-8583-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Bullous skin diseases are characterized by genetic abnormalities related to structural epidermal proteins or organ-specific autoantibodies against the same proteins and are revealed by blister formation on skin or mucous membranes, with differences in blister depth, morphology, and topography. Both inherited and autoimmune forms of these disorders can be framed in the context of epidermolysis bullosa. Their clinical spectrum varies from early lethal to mild variants with normal life expectancy, and several distinct phenotypes differ for age of onset, extent, location and depth of skin and mucous lesions, or scarring severity. Recently, different inflammatory processes blended with autoimmune phenomena have been demonstrated in both inherited and acquired epidermolysis bullosa, revealing that this overlapping might cause substantial implications in terms of disease course and outcome. Although several associations between epidermolysis bullosa in its different variants and autoimmune diseases have been reported, it is not yet completely clear how it happens and why this association occurs in only some patients. Autoantibodies are the primary cause of the disease in acquired epidermolysis bullosa, whereas they can be produced as a secondary event due to genetically determined skin damage in inherited epidermolysis bullosa, contributing significantly to the worsening of the disease. The awareness of this overlap may help in identifying new therapeutic approaches with immunosuppressive drugs that could have a significant impact in terms of prognosis.
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Affiliation(s)
- Susanna Esposito
- Pediatric Highly Intensive Care Unit, Department of Pathophysiology and Transplantation, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Università degli Studi di Milano, Via Commenda 9, 20122, Milan, Italy,
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32
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Gao J, Wang X, Zheng F, Dong S, Qiu X. Novel keratin 5 mutation in a family with epidermolysis bullosa simplex. Exp Ther Med 2015; 10:2432-2436. [PMID: 26668653 DOI: 10.3892/etm.2015.2811] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Accepted: 09/24/2015] [Indexed: 12/20/2022] Open
Abstract
The aim of the present study was to identify the causative gene defects associated with epidermolysis bullosa simplex (EBS) in a pedigree. The diagnosis of EBS was confirmed in two patients from that pedigree based on the clinical manifestations, histopathological examination of the skin and family history. Blood samples were collected from 6 family members and 100 heathy controls, and genomic DNA and RNA were extracted. Mutation analysis of the keratin 5 gene (KRT5) was conducted using polymerase chain reaction (PCR) direct sequencing and PCR-restriction fragment length polymorphism. In the pedigree, the results of PCR direct sequencing revealed a heterozygous missense mutation in codon 202 of exon 2 of KRT5 (c.605T>A), which led to an amino acid change (p.L202Q) in the patients with EBS but was absent from the unaffected family members and 100 population controls. In conclusion, a novel missense mutation in the KRT5 gene was identified that had a pathogenic role in EBS in the population studied, which enriches the germline mutation spectrum of the KRT5 gene.
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Affiliation(s)
- Jiajia Gao
- Center for Gene Diagnosis, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Xuebin Wang
- Center for Gene Diagnosis, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Fang Zheng
- Center for Gene Diagnosis, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Sufang Dong
- Center for Gene Diagnosis, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Xueping Qiu
- Center for Gene Diagnosis, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
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33
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Wertheim-Tysarowska K, Ołdak M, Giza A, Kutkowska-Kaźmierczak A, Sota J, Przybylska D, Woźniak K, Śniegórska D, Niepokój K, Sobczyńska-Tomaszewska A, Rygiel AM, Płoski R, Bal J, Kowalewski C. Novel sporadic and recurrent mutations in KRT5 and KRT14 genes in Polish epidermolysis bullosa simplex patients: further insights into epidemiology and genotype-phenotype correlation. J Appl Genet 2015; 57:175-81. [PMID: 26432462 PMCID: PMC4830863 DOI: 10.1007/s13353-015-0310-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Revised: 07/26/2015] [Accepted: 08/12/2015] [Indexed: 12/25/2022]
Abstract
Epidermolysis bullosa simplex (EBS) is a hereditary genodermatosis characterised by trauma-induced intraepidermal blistering of the skin. EBS is mostly caused by mutations in the KRT5 and KRT14 genes. Disease severity partially depends on the affected keratin type and may be modulated by mutation type and location. The aim of our study was to identify the molecular defects in KRT5 and KRT14 in a cohort of 46 Polish and one Belarusian probands with clinical suspicion of EBS and to determine the genotype-phenotype correlation. The group of 47 patients with clinical recognition of EBS was enrolled in the study. We analysed all coding exons of KRT5 and KRT14 using Sanger sequencing. The pathogenic status of novel variants was evaluated using bioinformatical tools, control group analysis (DNA from 100 healthy population-matched subjects) and probands' parents testing. We identified mutations in 80 % of patients and found 29 different mutations, 11 of which were novel and six were found in more than one family. All novel mutations were ascertained as pathogenic. In the majority of cases, the most severe genotype was associated with mutations in highly conserved regions. In some cases, different inheritance mode and clinical significance, than previously reported by others, was observed. We report 11 novel variants and show novel genotype-phenotype correlations. Our data give further insight into the natural history of EBS molecular pathology, epidemiology and mutation origin.
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Affiliation(s)
- K Wertheim-Tysarowska
- Department of Medical Genetics, Institute of Mother and Child, Kasprzaka 17a, 01211, Warsaw, Poland.
| | - M Ołdak
- Department of Histology and Embryology, Center of Biostructure Research, Medical University of Warsaw, Chalubinskiego 5, 02004, Warsaw, Poland.,Department of Genetics, World Hearing Center, Institute of Physiology and Pathology of Hearing, Warsaw, Poland
| | - A Giza
- Department of Medical Genetics, Institute of Mother and Child, Kasprzaka 17a, 01211, Warsaw, Poland
| | - A Kutkowska-Kaźmierczak
- Department of Medical Genetics, Institute of Mother and Child, Kasprzaka 17a, 01211, Warsaw, Poland
| | - J Sota
- Department of Medical Genetics, Institute of Mother and Child, Kasprzaka 17a, 01211, Warsaw, Poland
| | - D Przybylska
- Department of Histology and Embryology, Center of Biostructure Research, Medical University of Warsaw, Chalubinskiego 5, 02004, Warsaw, Poland
| | - K Woźniak
- Department of Dermatology and Immunodermatology, Medical University of Warsaw, Chalubinskiego 5, 02004, Warsaw, Poland
| | - D Śniegórska
- Department of Medical Genetics, Institute of Mother and Child, Kasprzaka 17a, 01211, Warsaw, Poland
| | - K Niepokój
- Department of Medical Genetics, Institute of Mother and Child, Kasprzaka 17a, 01211, Warsaw, Poland
| | - A Sobczyńska-Tomaszewska
- Department of Medical Genetics, Institute of Mother and Child, Kasprzaka 17a, 01211, Warsaw, Poland
| | - A M Rygiel
- Department of Medical Genetics, Institute of Mother and Child, Kasprzaka 17a, 01211, Warsaw, Poland
| | - R Płoski
- Department of Genetics, Medical University of Warsaw, Pawińskiego 5a, 02004, Warsaw, Poland
| | - J Bal
- Department of Medical Genetics, Institute of Mother and Child, Kasprzaka 17a, 01211, Warsaw, Poland
| | - C Kowalewski
- Department of Dermatology and Immunodermatology, Medical University of Warsaw, Chalubinskiego 5, 02004, Warsaw, Poland
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Mirza H, Kumar A, Craiglow BG, Zhou J, Saraceni C, Torbeck R, Ragsdale B, Rehder P, Ranki A, Choate KA. Mutations Affecting Keratin 10 Surface-Exposed Residues Highlight the Structural Basis of Phenotypic Variation in Epidermolytic Ichthyosis. J Invest Dermatol 2015; 135:3041-3050. [PMID: 26176760 DOI: 10.1038/jid.2015.284] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Revised: 05/12/2015] [Accepted: 05/26/2015] [Indexed: 12/30/2022]
Abstract
Epidermolytic ichthyosis (EI) due to KRT10 mutations is a rare, typically autosomal dominant, disorder characterized by generalized erythema and cutaneous blistering at birth followed by hyperkeratosis and less frequent blistering later in life. We identified two KRT10 mutations p.Q434del and p.R441P in subjects presenting with a mild EI phenotype. Both occur within the mutational "hot spot" of the keratin 10 (K10) 2B rod domain, adjacent to severe EI-associated mutations. p.Q434del and p.R441P formed collapsed K10 fibers rather than aggregates characteristic of severe EI KRT10 mutations such as p.R156C. Upon differentiation, keratinocytes from p.Q434del showed significantly lower apoptosis (P-value<0.01) compared with p.R156C as assessed by the TUNEL assay. Conversely, the mitotic index of the p.Q434del epidermis was significantly higher compared with that of p.R156C (P-value<0.01) as estimated by the Ki67 assay. Structural basis of EI phenotype variation was investigated by homology-based modeling of wild-type and mutant K1-K10 dimers. Both mild EI mutations were found to affect the surface-exposed residues of the K10 alpha helix coiled-coil and caused localized disorganization of the K1-K10 heterodimer. In contrast, adjacent severe EI mutations disrupt key intermolecular dimer interactions. Our findings provide structural insights into phenotypic variation in EI due to KRT10 mutations.
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Affiliation(s)
- Haris Mirza
- Department of Dermatology, School of Medicine, Yale University, New Haven, Connecticut, USA
| | - Anil Kumar
- Department of Biology and Chemistry, Laboratory of Biomolecular Research, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - Brittany G Craiglow
- Department of Dermatology, School of Medicine, Yale University, New Haven, Connecticut, USA
| | - Jing Zhou
- Department of Dermatology, School of Medicine, Yale University, New Haven, Connecticut, USA
| | - Corey Saraceni
- Department of Dermatology, School of Medicine, Yale University, New Haven, Connecticut, USA
| | - Richard Torbeck
- St Luke's-Roosevelt Hospital-Mount Sinai Health System, New York, New York, USA
| | - Bruce Ragsdale
- Central Coast Pathology Laboratory, San Louis, California, USA
| | - Paul Rehder
- The Dermatology Medical Group of Oxnard and Camarillo, Camarillo, California, USA
| | - Annamari Ranki
- Department of Dermatology and Allergology, University of Helsinki and Skin and Allergy Hospital, Helsinki University Central Hospital (HUCH), Helsinki, Finland
| | - Keith A Choate
- Department of Dermatology, School of Medicine, Yale University, New Haven, Connecticut, USA; Department of Genetics and Pathology, School of Medicine, Yale University, New Haven, Connecticut, USA.
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35
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Boeira VLSY, Souza ES, Rocha BDO, Oliveira PD, Oliveira MDFSPD, Rêgo VRPDA, Follador I. Inherited epidermolysis bullosa: clinical and therapeutic aspects. An Bras Dermatol 2014; 88:185-98. [PMID: 23739692 PMCID: PMC3750879 DOI: 10.1590/s0365-05962013000200001] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2012] [Accepted: 10/24/2012] [Indexed: 12/20/2022] Open
Abstract
Inherited epidermolysis bullosa (EB) is a heterogeneous group of genetic disorders
that present with skin and, in some cases, mucosal fragility, predisposing patients
to the development of blisters and/or erosions after minimal trauma or friction.
Children with a recurrent history of these kinds of lesions or neonates that present
them in the absence of another reasonable explanation should be investigated.
Diagnosis must be based on clinical and histopathological findings. To date,
management of inherited EB basically consists in avoiding traumas that trigger
lesions, as well as preventing infection and facilitating healing of the wounds with
the systematic use of bandages.
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36
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Wertheim‐Tysarowska K, Sota J, Kutkowska‐Kaźmierczak A, Woźniak K, Bal J, Kowalewski C. Coexistence of
KRT
14
and
KRT
5
mutations in a
P
olish patient with epidermolysis bullosa simplex. Br J Dermatol 2014; 170:468-9. [DOI: 10.1111/bjd.12624] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Wertheim‐Tysarowska
- Department of Medical Genetics Institute of Mother and Child Kasprzaka 17a Warsaw 01‐211 Poland
| | - J. Sota
- Department of Medical Genetics Institute of Mother and Child Kasprzaka 17a Warsaw 01‐211 Poland
| | | | - K. Woźniak
- Department of Dermatology and Immunodermatology Warsaw Medical University Warsaw Poland
| | - J. Bal
- Department of Medical Genetics Institute of Mother and Child Kasprzaka 17a Warsaw 01‐211 Poland
| | - C. Kowalewski
- Department of Dermatology and Immunodermatology Warsaw Medical University Warsaw Poland
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37
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Bolling MC, Jongbloed JDH, Boven LG, Diercks GFH, Smith FJD, Irwin McLean WH, Jonkman MF. Plectin mutations underlie epidermolysis bullosa simplex in 8% of patients. J Invest Dermatol 2014; 134:273-276. [PMID: 23774525 DOI: 10.1038/jid.2013.277] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Marieke C Bolling
- Department of Dermatology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Jan D H Jongbloed
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Ludolf G Boven
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Gilles F H Diercks
- Department of Dermatology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Frances J D Smith
- Epithelial Genetics Group, Division of Molecular Medicine, Colleges of Life Sciences and Medicine, Dentistry and Nursing, University of Dundee, Dundee, UK
| | - W H Irwin McLean
- Epithelial Genetics Group, Division of Molecular Medicine, Colleges of Life Sciences and Medicine, Dentistry and Nursing, University of Dundee, Dundee, UK
| | - Marcel F Jonkman
- Department of Dermatology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
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