RESUMO
BACKGROUND: Autosomal recessive congenital ichthyoses (ARCI) have been associated with different phenotypes including: harlequin ichthyosis (HI), congenital ichthyosiform erythroderma (CIE), and lamellar ichthyosis (LI). While pathogenic variants in all ARCI genes are associated with LI and CIE phenotypes, the unique gene associated with HI is ABCA12. In HI, the most severe ARCI form, pathogenic variants in both ABCA12 gene alleles usually have a severe impact on protein function. The presence of at least one non-truncating variant frequently causes a less severe congenital ichthyosis phenotype (LI and CIE). METHODS: We report the case of a 4-year-old Ecuadorian boy with a severe skin disease. Genetic diagnosis was performed by NGS. In silico predictions were performed using Alamut software v2.11. A review of the literature was carried out to identify all patients carrying ABCA12 splice-site and missense variants, and to explore their genotype-phenotype correlations. RESULTS: Genetic testing revealed a nonsense substitution, p.(Arg2204*), and a new missense variant, p.(Val1927Leu), in the ABCA12 gene. After performing in silico analysis and a comprehensive review of the literature, we conclude that p.(Val1927Leu) affects a well conserved residue which could either disturb the protein function or alter the splicing process, both alternatives could explain the severe phenotype of our patient. CONCLUSION: This case expands the spectrum of ABCA12 reported disease-causing variants which is important to unravel genotype-phenotype correlations and highlights the importance of missense variants in the development of HI.
Assuntos
Transportadores de Cassetes de Ligação de ATP/genética , Ictiose Lamelar/genética , Mutação com Perda de Função , Fenótipo , Pré-Escolar , Códon sem Sentido , Humanos , Ictiose Lamelar/patologia , Masculino , Mutação de Sentido Incorreto , Sítios de Splice de RNARESUMO
El bebé colodión se caracteriza por la presencia de una membrana que cubre la totalidad de la piel del recién nacido. La mayoría de los niños que presenta esta membrana desarrolla ictiosis, siendo la eritrodermia ictiosiforme congénita no ampollar la forma más frecuente, seguida de la ictiosis lamelar y la ictiosis vulgar. No existen características clínicas ni histológicas que sirvan de guía para predecir el diagnóstico final. Estos niños presentan complicaciones debido a las alteraciones de la función de barrera de la piel, como deshidratación hipernatrémica, hipotermia e infecciones cutáneas y sistémicas. Sin embargo el pronóstico de este cuadro ha mejorado en los últimos años debido a los mejores cuidados intensivos neonatales. Presentamos tres casos de bebé colodión evaluados en el servicio de Dermatología del Complejo Hospitalario de Pontevedra (España) y describimos sus características clínicas, tratamientos, complicaciones, pruebas complementarias realizadas y diagnóstico final. A pesar de que el bebé colodión es un fenotipo infrecuente, destacamos la importancia de conocer su tratamiento, así como los diferentes procesos a los que puede dar lugar...(AU)
Collodion baby consists on a membrane covering the whole body surface of a newborn. Most children born as collodion baby develop ichthyosis, being the most frequent the non-bullous congenital ichthyosiform erythroderma, followed by lamellar ichthyosis and ichthyosis vulgaris. There are no distinctive clinical or histological features that can be used to predict the final diagnosis. These children have complications due to the impaired barrier function, such as hypernatraemic dehydration, hypothermia, or cutaneous and systemic infections. However the prognosis has dramatically improved over time with the development of neonatal intensive care. We present three cases of collodion baby seen at the Dermatology Service of the Pontevedra Hospital Complex (Spain) and describe their clinical characteristics, treatments, complications, diagnostic procedures and final diagnoses. Despite collodion baby is an uncommon entity, we highlight the importance of knowing its treatment and the different processes that may arise from it...(AU)
Assuntos
Humanos , Masculino , Lactente , Ictiose Lamelar , Eritrodermia Ictiosiforme CongênitaRESUMO
El bebé colodión se caracteriza por la presencia de una membrana que cubre la totalidad de la piel del recién nacido. La mayoría de los niños que presenta esta membrana desarrolla ictiosis, siendo la eritrodermia ictiosiforme congénita no ampollar la forma más frecuente, seguida de la ictiosis lamelar y la ictiosis vulgar. No existen características clínicas ni histológicas que sirvan de guía para predecir el diagnóstico final. Estos niños presentan complicaciones debido a las alteraciones de la función de barrera de la piel, como deshidratación hipernatrémica, hipotermia e infecciones cutáneas y sistémicas. Sin embargo el pronóstico de este cuadro ha mejorado en los últimos años debido a los mejores cuidados intensivos neonatales. Presentamos tres casos de bebé colodión evaluados en el servicio de Dermatología del Complejo Hospitalario de Pontevedra (España) y describimos sus características clínicas, tratamientos, complicaciones, pruebas complementarias realizadas y diagnóstico final. A pesar de que el bebé colodión es un fenotipo infrecuente, destacamos la importancia de conocer su tratamiento, así como los diferentes procesos a los que puede dar lugar...
Collodion baby consists on a membrane covering the whole body surface of a newborn. Most children born as collodion baby develop ichthyosis, being the most frequent the non-bullous congenital ichthyosiform erythroderma, followed by lamellar ichthyosis and ichthyosis vulgaris. There are no distinctive clinical or histological features that can be used to predict the final diagnosis. These children have complications due to the impaired barrier function, such as hypernatraemic dehydration, hypothermia, or cutaneous and systemic infections. However the prognosis has dramatically improved over time with the development of neonatal intensive care. We present three cases of collodion baby seen at the Dermatology Service of the Pontevedra Hospital Complex (Spain) and describe their clinical characteristics, treatments, complications, diagnostic procedures and final diagnoses. Despite collodion baby is an uncommon entity, we highlight the importance of knowing its treatment and the different processes that may arise from it...