Letter - Clinical
A case of dystrophic epidermolysis bullosa with a rare COL7A1 variant
a Dermatology and Venereology Service, Centro Hospitalar Universitário de São João, Porto, Portugal
b Medical Genetics Service, Centro Hospitalar Universitário de São João, Porto, Portugal
c Neonatology Service, Centro Hospitalar Universitário de São João, Porto, Portugal
d Facudade de Medicina da Universidade do Porto, Porto, Portugal
e Centro de Investigação em Tecnologias e Serviços de Saúde, Porto, Portugal
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He also presented corneal opacity in the right eye with hypervascularization and hemorrhage. Nails, hair, and mucosae were normal. The patient was the first child of a healthy, non-consanguineous couple with no family history of blistering skin diseases. A 22 gene panel performed by Next-Generation Sequencing (NGS) found a pathogenic variant, c.325_326insCG (p.Glu109Alafs*39), in homozygosity in the COL7A1 gene. In the first months of life, the condition worsened with new lesions on the hands and armpits and mutilating scarring of the feet. Unfortunately, parents declined further studies. Based on clinical presentation and genetic analysis, a diagnosis of Severe Recessive Dystrophic Epidermolysis Bullosa was made.</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0010" class="elsevierStylePara elsevierViewall">Dystrophic Epidermolysis Bullosa (DEB) is an inherited skin fragility disorder, characterized by blister formation in the sublamina densa. It is caused by pathogenic variants in the COL7A1 gene, that encodes type VII collagen, responsible for a cohesive dermal-epidermal junction. The inheritance pattern could be Recessive (RDEB) or Dominant (DDEB).<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1,2</span></a> The clinical spectrum is highly variable, from generalized blistering forms, with mucous involvement, to mild localized ones, and, in general, recessive forms are more severe.<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> The latter is usually associated with variants causing Premature Stop Codons (PTC), with subsequent decay or truncated polypeptides. In heterozygosity, PTC variants do not cause disease, but compound heterozygosity with missense variants could be associated with milder forms of RDEB. DDEB is generally caused by glycine substitutions, but other mutations could be involved. Glycine substitutions could also be inherited recessively, and some specific substitutions were even associated with both RDEB and DDEB.<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1–3</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">The severity of symptoms depends on the level of COL7A1 expression, which is determined by the type and position of the pathogenic variant.<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1–3</span></a> However, genotype-phenotype correlation is not consistent and identical variants could result in different phenotypes, which suggests that other factors, genetic or environmental, may be involved in this phenotype divergence.<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1,4</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">The variant presented in our patient is rare, with less than 10 cases previously reported. Interestingly, this variant was only reported in northern parts of Portugal and Brazil, which could be due to a founding effect, related to the former Portuguese settlement.<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">The present case contributes to the mutational spectrum associated with RDEB and to a better understanding of its clinical correlation.</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Financial support</span><p id="par0030" class="elsevierStylePara elsevierViewall">None declared.</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Authors’ contributions</span><p id="par0035" class="elsevierStylePara elsevierViewall">Patrícia Amoedo: Writing and editing (lead).</p><p id="par0040" class="elsevierStylePara elsevierViewall">Ana Grangeia: Review (support).</p><p id="par0045" class="elsevierStylePara elsevierViewall">Lígia Peralta: Review (support).</p><p id="par0050" class="elsevierStylePara elsevierViewall">Alberto Mota: Review and final approval.</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Conflicts of interest</span><p id="par0055" class="elsevierStylePara elsevierViewall">None declared.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:4 [ 0 => array:2 [ "identificador" => "sec0005" "titulo" => "Financial support" ] 1 => array:2 [ "identificador" => "sec0010" "titulo" => "Authors’ contributions" ] 2 => array:2 [ "identificador" => "sec0015" "titulo" => "Conflicts of interest" ] 3 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2022-08-31" "fechaAceptado" => "2022-09-30" "multimedia" => array:2 [ 0 => array:8 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1471 "Ancho" => 2508 "Tamanyo" => 234040 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0005" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Extensive areas of skin detachment on the anteromedial aspects of both lower extremities (A) and perioral region (B).</p>" ] ] 1 => array:8 [ "identificador" => "fig0010" "etiqueta" => "Figure 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 1446 "Ancho" => 2508 "Tamanyo" => 334861 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0010" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Blistering and skin detachment at trunk (A) and scalp (B).</p>" ] ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0005" "bibliografiaReferencia" => array:4 [ 0 => array:3 [ "identificador" => "bib0005" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "An overview of the genetic basis of epidermolysis bullosa in Brazil: discovery of novel and recurrent disease-causing variants" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:6 [ 0 => "L.M. 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| Year/Month | Html | Total | |
|---|---|---|---|
| 2024 November | 17 | 5 | 22 |
| 2024 October | 95 | 70 | 165 |
| 2024 September | 149 | 103 | 252 |
| 2024 August | 166 | 123 | 289 |
| 2024 July | 116 | 112 | 228 |
| 2024 June | 165 | 69 | 234 |
| 2024 May | 334 | 92 | 426 |
| 2024 April | 135 | 93 | 228 |
| 2024 March | 107 | 96 | 203 |
| 2024 February | 32 | 33 | 65 |
