MAGDA MARIA SALES CARNEIRO SAMPAIO
Projetos de Pesquisa
Unidades Organizacionais
Departamento de Pediatria, Faculdade de Medicina - Docente
LIM/36 - Laboratório de Pediatria Clínica, Hospital das Clínicas, Faculdade de Medicina - Líder
LIM/36 - Laboratório de Pediatria Clínica, Hospital das Clínicas, Faculdade de Medicina - Líder
4 resultados
Resultados de Busca
Agora exibindo 1 - 4 de 4
- Lymphoproliferative disorder with polyautoimmunity and hypogammaglobulinemia: An unusual presentation of 22q11.2 deletion syndrome(2020) SOARES, Diogo C.; DANTAS, Anelisa G.; MATTA, Marina C.; PASTORINO, Antonio C.; MELARAGNO, Maria Isabel; KULIKOWSKI, Leslie; MONTENEGRO, Marilia; KIM, Chong A.; CARNEIRO-SAMPAIO, Magda; TORRES, Leuridan C.22q11.2 deletion syndrome (22q11.2DS) has a heterogeneous presentation that includes multiple congenital anomalies and immunodeficiency, one of the most striking features. Usually, it is characterized by T cell lymphopenia, B cell dysfunction and autoimmunity. Here, we describe an unusual case of 22q11.2DS in a patient with lymphoproliferative disorder, polyautoimmunity and hypogammaglobulinemia.
- B cell subsets in thymus from infants with Down syndrome(2023) SILVEIRA-LESSA, Ana Lucia; PALMEIRA, Patricia; VINHAS, Christiana; FERREIRA, Leandro; CHACCUR, Paulo; ZERBINI, Maria Claudia N.; CARNEIRO-SAMPAIO, Magda
- A novel activation-induced cytidine deaminase (AID) mutation in Brazilian patients with hyper-IgM type 2 syndrome(2013) CARATAO, Nadine; CORTESAO, Catarina S.; REIS, Pedro H.; FREITAS, Raquel F.; JACOB, Cristina M. A.; PASTORINO, Antonio C.; CARNEIRO-SAMPAIO, Magda; BARRETO, Vasco M.Activation-induced cytidine deaminase (AID) is a DNA editing protein that plays an essential role in three major events of immunoglobulin (Ig) diversification: somatic hypermutation, class switch recombination and Ig gene conversion. Mutations in the AID gene (AICDA) have been found in patients with autosomal recessive Hyper-IgM (HIGM) syndrome type 2. Here, two 9- and 14-year-old Brazilian sisters, from a consanguineous family, were diagnosed with HIGM2 syndrome. Sequencing analysis of the exons from AICDA revealed that both patients are homozygous for a single C to G transversion in the third position of codon 15, which replaces a conserved Phenylalanine with a Leucine. To our knowledge, this is a new AICDA mutation found in HIGM2 patients. Functional studies confirm that the homologous murine mutation leads to a dysfunctional protein with diminished intrinsic cytidine deaminase activity and is unable to rescue CSR when introduced in Aicda(-/-) stimulated murine B cells. We briefly discuss the relevance of AICDA mutations found in patients for the biology of this molecule.
- Fetal-onset IPEX: Report of two families and review of literature(2015) XAVIER-DA-SILVA, Mariana Moraes; MOREIRA-FILHO, Carlos A.; SUZUKI, Edson; PATRICIO, Francy; COUTINHO, Antonio; COUTINHO, Antonio; CARNEIRO-SAMPAIO, MagdaEarly-life autoimmunity is an IPEX characteristic, however intrauterine forms had not yet been described. Here, two unrelated families with clear evidence of fetal-onset IPEX are reported. One had 5 miscarriages of males in two generations, and a newborn presenting type-1 diabetes mellitus immediately after birth, diarrhea, thrombocytopenia, eczematous dermatitis, eosinophilia, high IgE levels and autoantibodies to pancreatic islet antigens at 4-days-old. Maternal serology was negative. He presented a FOXP3 mutation, c.1189C>T, p.Arg397Trp, previously described only in another family with IPEX at birth. The second family had several miscarriages of males in three consecutive generations and a novel FOXP3 c.319_320delTC mutation was observed in two miscarried monochorionic twin male fetuses. These twins died at 21 weeks of gestation due to hydrops, and CD3+ infiltrating lymphocytes were found in their pancreas. We demonstrate that: i) IPEX may develop in fetal life; and ii) c.1189C>T and c.319_320delTC mutations are associated with early-onset phenotype.