ABSTRACT
Abstract Background: LPS-responsive beige -like anchor protein (LRBA) deficiency is a primary immunodeficiency disease caused by loss of LRBA protein expression, due to biallelic mutations in LRBA gene. LRBA deficiency patients exhibit a clinically heterogeneous syndrome. The main clinical complication of LRBA deficiency is immune dysregulation. Furthermore, hypogammaglobulinemia is found in more than half of patients with LRBA-deficiency. To date, no patients with this condition have been reported in Colombia Objective: To evaluate the expression of the LRBA protein in patients from Colombia with clinical phenotype associated to LRBA-deficiency. Methods: In the present study the LRBA-expression in patients from Colombia with clinical phenotype associated to LRBA-deficiency was evaluated. After then, the clinical, the immunological characteristics and the possible genetic variants in LRBA or other genes associated with the immune system in patients that exhibit decrease protein expression was evaluated. Results: In total, 112 patients with different clinical manifestations associated to the clinical LRBA phenotype were evaluated. The LRBA expression varies greatly between different healthy donors and patients. Despite the great variability in the LRBA expression, six patients with a decrease in LRBA protein expression were observed. However, no pathogenic or possible pathogenic biallelic variants in LRBA, or in genes related with the immune system were found. Conclusion: LRBA expression varies greatly between different healthy donors and patients. Reduction LRBA-expression in 6 patients without homozygous mutations in LRBA or in associated genes with the immune system was observed. These results suggest the other genetic, epigenetic or environmental mechanisms, that might be regulated the LRBA-expression.
Resumen Antecedentes: la deficiencia de LRBA (del inglés, LPS-responsive beige -like anchor protein) es una inmunodeficiencia primaria causada por la pérdida de la expresión de la proteína LRBA, debido a mutaciones bialélicas en el gen LRBA. Los pacientes con deficiencia de LRBA exhiben un síndrome clínicamente heterogéneo. La principal complicación clínica de la deficiencia de LRBA es la desregulación inmune. Además, la hipogammaglobulinemia se encuentra en más de la mitad de los pacientes con deficiencia de LRBA. Hasta la fecha, no se han reportado pacientes con esta afección en Colombia Objetivo: Evaluar la expresión de la proteína LRBA en pacientes de Colombia con fenotipo clínico asociado a deficiencia de LRBA Métodos: En el presente estudio se evaluó la expresión de LRBA en pacientes de Colombia con fenotipo clínico asociado a deficiencia de LRBA. Después de eso, se evaluaron las características clínicas, inmunológicas y las posibles variantes genéticas en LRBA o en otros genes asociadados con el sistema inmune en pacientes que exhiben una disminución de la expresión de la proteína. Resultados: En total, se evaluaron 112 pacientes con diferentes manifestaciones clínicas asociadas al fenotipo clínico LRBA. La expresión de LRBA varía mucho entre diferentes donantes sanos y pacientes. A pesar de la gran variabilidad en la expresión de LRBA, se observaron seis pacientes con una disminución en la expresión de la proteína LRBA. Sin embargo, no se encontraron variantes bialélicas patógenas o posibles patógenas en LRBA, o en genes relacionados con el sistema inmune. Conclusión: La expresión de LRBA varía mucho entre diferentes donantes sanos y pacientes. Se observó reducción de la expresión de LRBA en 6 pacientes sin mutaciones homocigotas en LRBA o en genes asociados. Estos resultados sugieren los otros mecanismos genéticos, por ejemplo epigenéticos o ambientales, que podrían estar regulados por la expresión de LRBA
Subject(s)
Adult , Child , Child, Preschool , Female , Humans , Male , Young Adult , Agammaglobulinemia/epidemiology , Adaptor Proteins, Signal Transducing/genetics , Immunologic Deficiency Syndromes/genetics , Phenotype , Genetic Variation , Case-Control Studies , Gene Expression Regulation , Colombia , Agammaglobulinemia/genetics , Agammaglobulinemia/immunology , Adaptor Proteins, Signal Transducing/deficiency , Adaptor Proteins, Signal Transducing/immunology , Immunologic Deficiency Syndromes/immunology , MutationABSTRACT
A imunodeficiência de variável comum é uma imunodeficiência primária de apresentação heterogênea, consistindo em um défice em imunoglobulinas. É caracterizada por infeções de repetição e predisposição para doenças autoimunes, granulomatosas e neoplásicas. Os autores apresentam o caso clínico de um doente com imunodeficiência comum variável manifestada por infeções cutâneas de repetição e linfadenite recorrente. Este caso tem como objetivo alertar para os aspetos clínicos desta imunodeficiência, a fim de permitir seu diagnóstico precoce, evitando-se prognósticos desfavoráveis.(AU)
Common variable immunodeficiency is a primary immunodeficiency with a heterogeneous presentation, characterized by decreased immunoglobulin levels. It is characterized by recurrent infections, predisposition to autoimmune, granulomatous and neoplastic diseases. The authors report a case of a patient with common variable immunodeficiency and history of skin infections and recurrent lymphadenitis. This case report aims to draw the attention to the clinical aspects of this immunodeficiency, in order to promote an early diagnosis, avoiding poor outcomes.(AU)