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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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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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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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4
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Jantke M, Has C, Haenssle HA, Schön MP, Emmert S. Epidermolysis bullosa simplex: greater penetrance due to a keratin 5 gene variant. Clin Exp Dermatol 2013; 39:80-1. [PMID: 23746086 DOI: 10.1111/ced.12175] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/08/2013] [Indexed: 11/27/2022]
Affiliation(s)
- M Jantke
- Department of Dermatology, Venereology and Allergology, Georg-August-University Goettingen, Rober-Koch-Str. 40, D 37075, Goettingen, Germany
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