YUBERO GONCALVEZ, MARIA JOAO

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YUBERO GONCALVEZ, MARIA JOAO
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myubero@udd.cl
ORCID
0000-0002-1568-7015
Scopus Author ID
36197703800
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    Patients suffering from dystrophic epidermolysis bullosa are prone to developing autoantibodies against skin proteins: A longitudinal confirmational study
    (2024)
    J. Bremer
    ;
    H. H. Pas
    ;
    G. F. H. Diercks
    ;
    H. J. Meijer
    ;
    S. M. van der Molen
    <jats:title>Abstract</jats:title><jats:p>Epidermolysis bullosa (EB) is a heritable skin blistering disease caused by variants in genes coding for proteins that secure cell–cell adhesion and attachment of the epidermis to the dermis. Interestingly, several proteins involved in inherited EB are also associated with autoimmune blistering diseases (AIBD). In this study, we present a long‐term follow‐up of 15 patients suffering from recessive dystrophic or junctional EB. From these patients, 62 sera were analysed for the presence of autoantibodies associated with AIBD. We show that patients suffering from recessive dystrophic EB (RDEB) are more susceptible to developing autoantibodies against skin proteins than patients suffering from junctional EB (70% vs. 20%, respectively). Interestingly, no correlation with age was observed. Most patients showed reactivity to Type XVII collagen/linear IgA bullous dermatosis autoantigen (<jats:italic>n</jats:italic> = 5; 33%), followed by BP230 (<jats:italic>n</jats:italic> = 4; 27%), Type VII collagen (<jats:italic>n</jats:italic> = 4; 27%) and laminin‐332 (<jats:italic>n</jats:italic> = 1; 7%). The pathogenicity of these autoantibodies remains a subject for future experiments.</jats:p>
    Scopus© Citations 3  1
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    Scopus© Citations 11  2
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    Novel and recurrent COL7A1 mutations in Chilean patients with dystrophic epidermolysis bullosa
    (2012)
    Fernando A. Rodríguez
    ;
    María José Gana
    ;
    YUBERO GONCALVEZ, MARIA JOAO  
    ;
    Gisela Zillmann
    ;
    Susanne M. Krämer
    Scopus© Citations 14  1
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    Novel variants impairing Sp1 transcription factor binding in the COL7A1 promoter cause mild cases of recessive dystrophic epidermolysis bullosa
    (Springer Science and Business Media LLC, 2024-12-05)
    Nathalie Pironon
    ;
    Artyom Gasparyan
    ;
    YUBERO GONCALVEZ, MARIA JOAO  
    ;
    Sabine Duchatelet
    ;
    Kristina Hovhannesyan
    <jats:title>Abstract</jats:title><jats:p>Recessive dystrophic epidermolysis bullosa (RDEB) is a rare and most often severe genodermatosis characterized by recurrent blistering and erosions of the skin and mucous membranes after minor trauma, leading to major local and systemic complications. RDEB is caused by loss-of-function mutations in <jats:italic>COL7A1</jats:italic> encoding type VII collagen (C7), the main component of anchoring fibrils which form attachment structures stabilizing the cutaneous basement membrane zone. Most of the previously reported <jats:italic>COL7A1</jats:italic> mutations are located in the coding or intronic regions. We describe 6 patients with localized or intermediate RDEB for whom one recessive pathogenic variant in the coding region and a second variant in the <jats:italic>COL7A1</jats:italic> promoter were identified. These substitutions, three of which are novel, are localized in two Sp1 binding sites of the promoter region. DNA pull-down assay showed a drastic reduction of Sp1 binding consistent with a dramatic decrease in <jats:italic>COL7A1</jats:italic> transcript and almost undetectable C7 protein levels. Our results reveal that mutations in the <jats:italic>COL7A1</jats:italic> promoter on the background of a null allele can underlie localized or intermediate RDEB. They further emphasize the functional importance of Sp1 motifs in the proximal <jats:italic>COL7A1</jats:italic> promoter which should be carefully investigated for regulatory mutations in the case of RDEB with only one pathogenic variant identified in the coding or intronic regions.</jats:p>
    Scopus© Citations 2  5
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    Case Report: Crown Resorption in a Patient With Junctional Epidermolysis Bullosa and Amelogenesis Imperfecta With LAMB3 Gene Mutations
    (2021)
    Blanca Urzúa
    ;
    Susanne Krämer
    ;
    Irene Morales-Bozo
    ;
    Claudia Camacho
    ;
    YUBERO GONCALVEZ, MARIA JOAO  
    <jats:p><jats:bold>Background:</jats:bold> Epidermolysis bullosa (EB) corresponds to a series of conditions characterized by extreme fragility of the skin and/or mucous membranes. Of the four main types of EB, junctional EB (JEB) is the most associated with alterations in the teeth. The purposes of this study were to determine the clinical, histopathological, and ultrastructural characteristics of teeth with amelogenesis imperfecta (AI) in a patient with JEB, and compare them with control teeth, and correlate the findings with the mutations present in the patient.</jats:p><jats:p><jats:bold>Case Report:</jats:bold> The study was conducted on a 10-year-old patient with JEB carrier of two recessive mutations in the <jats:italic>LAMB3</jats:italic> gene and absence of the laminin-332 protein (LM-332), determined by immunofluorescence on a skin biopsy. The patient presents hypoplastic AI with very thin and yellow-brown colored enamel. Extraction of two permanent molars was performed due to pain and soft tissue covering the crown, resembling pulp polyp or hyperplastic gingiva. Light and scanning electron microscopy (SEM) revealed very thin enamel varying from complete absence to 60 μm, absence of normal prismatic structure, and presence of a cross-banding with a laminated appearance. The histopathological study revealed granulation tissue causing external crown resorption.</jats:p><jats:p><jats:bold>Conclusion:</jats:bold> Although coronary resorption has been reported in patients with syndromic and non-syndromic AI, this is the first clinicopathological report of coronary resorption in partially erupted teeth in patients with JEB with mutations in the <jats:italic>LAMB3</jats:italic> gene and hypoplastic AI. In patients with this condition, the presence of partially erupted teeth with soft tissue covering part of the crown, without a periodontal pocket, and with a radiographic image of partial coronal radiolucency should lead to suspicion of external coronary resorption.</jats:p>
    Scopus© Citations 1  3
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    Maintenance of chronicity signatures in fibroblasts isolated from recessive dystrophic epidermolysis bullosa chronic wound dressings under culture conditions
    (2023)
    DE GREGORIO CONCHA, CRISTIAN ALEJANDRO  
    ;
    Evelyng Catalán
    ;
    Gabriel Garrido
    ;
    Pilar Morandé
    ;
    CASTILLO BENNETT, JIMENA VICTORIA  
    <jats:title>Abstract</jats:title><jats:sec> <jats:title>Background</jats:title> <jats:p>Recessive Dystrophic Epidermolysis Bullosa (RDEB) is a rare inherited skin disease caused by variants in the <jats:italic>COL7A1</jats:italic> gene, coding for type VII collagen (C7), an important component of anchoring fibrils in the basement membrane of the epidermis. RDEB patients suffer from skin fragility starting with blister formation and evolving into chronic wounds, inflammation and skin fibrosis, with a high risk of developing aggressive skin carcinomas. Restricted therapeutic options are limited by the lack of in vitro models of defective wound healing in RDEB patients.</jats:p> </jats:sec><jats:sec> <jats:title>Results</jats:title> <jats:p>In order to explore a more efficient, non-invasive in vitro model for RDEB studies, we obtained patient fibroblasts derived from discarded dressings) and examined their phenotypic features compared with fibroblasts derived from non-injured skin of RDEB and healthy-donor skin biopsies. Our results demonstrate that fibroblasts derived from RDEB chronic wounds (RDEB-CW) displayed characteristics of senescent cells, increased myofibroblast differentiation, and augmented levels of TGF-β1 signaling components compared to fibroblasts derived from RDEB acute wounds and unaffected RDEB skin as well as skin from healthy-donors. Furthermore, RDEB-CW fibroblasts exhibited an increased pattern of inflammatory cytokine secretion (IL-1β and IL-6) when compared with RDEB and control fibroblasts. Interestingly, these aberrant patterns were found specifically in RDEB-CW fibroblasts independent of the culturing method, since fibroblasts obtained from dressing of acute wounds displayed a phenotype more similar to fibroblasts obtained from RDEB normal skin biopsies.</jats:p> </jats:sec><jats:sec> <jats:title>Conclusions</jats:title> <jats:p>Our results show that in vitro cultured RDEB-CW fibroblasts maintain distinctive cellular and molecular characteristics resembling the inflammatory and fibrotic microenvironment observed in RDEB patients’ chronic wounds. This work describes a novel, non-invasive and painless strategy to obtain human fibroblasts chronically subjected to an inflammatory and fibrotic environment, supporting their use as an accessible model for in vitro studies of RDEB wound healing pathogenesis. As such, this approach is well suited to testing new therapeutic strategies under controlled laboratory conditions.</jats:p> </jats:sec>
    Scopus© Citations 1  1
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    Epidemiology of epidermolysis bullosa in Chile
    (2024)
    PALISSON ETCHARREN, FRANCIS  
    ;
    YUBERO GONCALVEZ, MARIA JOAO  
    ;
    Cristóbal Lecaros
    ;
    Susanne Krämer
    ;
    Constanza Fuentes
    <jats:p>In this manuscript we are presenting the first National Epidermolysis Bullosa Epidemiology study done in South America. Our manuscript describes not only population-level estimates, such as incidence, prevalence and mortality of EB, but also genetic data that are unique to this underrepresented population. We report new data about this rare disease showing comparable life expectancy to wealthier nations, demonstrating the value of specialized EB care centres.</jats:p>
    Scopus© Citations 3  13