FLAVIA BALBO PIAZZON
Projetos de Pesquisa
Unidades Organizacionais
LIM/03 - Laboratório de Medicina Laboratorial, Hospital das Clínicas, Faculdade de Medicina
12 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 12
- Complex structural rearrangement features suggesting chromoanagenesis mechanism in a case of 1p36 deletion syndrome(2014) ZANARDO, Evelin Aline; PIAZZON, Flavia Balbo; DUTRA, Roberta Lelis; DIAS, Alexandre Torchio; MONTENEGRO, Marilia Moreira; NOVO-FILHO, Gil Monteiro; COSTA, Thais Virginia Moura Machado; NASCIMENTO, Amom Mendes; KIM, Chong Ae; KULIKOWSKI, Leslie DomeniciGenome rearrangements are caused by the erroneous repair of DNA double-strand breaks, leading to several alterations that result in loss or gain of the structural genomic of a dosage-sensitive genes. However, the mechanisms that promote the complexity of rearrangements of congenital or developmental defects in human disease are unclear. The investigation of complex genomic abnormalities could help to elucidate the mechanisms and causes for the formation and facilitate the understanding of congenital or developmental defects in human disease. We here report one case of a patient with atypical clinical features of the 1p36 syndrome and the use of cytogenomic techniques to characterize the genomic alterations. Analysis by multiplex ligation-dependent probe amplification and array revealed a complex rearrangement in the 1p36.3 region with deletions and duplication interspaced by normal sequences. We also suggest that chromoanagenesis could be a possible mechanism involved in the repair and stabilization of this rearrangement.
conferenceObject 16q24 DUPLICATION AND IVEMARK SYNDROME: A NOVEL GENOMIC CAUSE?(2017) SOARES, Diogo C.; PIAZZON, Flavia B.; ZANARDO, Evelin; PASTORINO, Antonio Carlos; KULIKOWSKI, Leslie D.; BERTOLA, Debora R.; CARNEIRO-SAMPAIO, Magda; KIM, Chong Ae- Subtelomeric Copy Number Variations: The Importance of 4p/4q Deletions in Patients with Congenital Anomalies and Developmental Disability(2016) NOVO-FILHO, Gil M.; MONTENEGRO, Marilia M.; ZANARDO, Evelin A.; DUTRA, Roberta L.; DIAS, Alexandre T.; PIAZZON, Flavia B.; COSTA, Tais V. M. M.; NASCIMENTO, Amom M.; HONJO, Rachel S.; KIM, Chong A.; KULIKOWSKI, Leslie D.The most prevalent structural variations in the human genome are copy number variations (CNVs), which appear predominantly in the subtelomeric regions. Variable sizes of 4p/4q CNVs have been associated with several different psychiatric findings and developmental disability (DD). We analyzed 105 patients with congenital anomalies (CA) and developmental and/or intellectual disabilities (DD/ID) using MLPA subtelomeric specific kits (P036 /P070) and 4 of them using microarrays. We found abnormal subtelomeric CNVs in 15 patients (14.3%), including 8 patients with subtelomeric deletions at 4p/4q (53.3%). Additional genomic changes were observed at 1p36, 2q37.3, 5p15.3, 5q35.3, 8p23.3, 13q11, 14q32.3, 15q11.2, and Xq28/Yq12. This indicates the prevalence of independent deletions at 4p/4q, involving PIGG, TRIML2, and FRG1. Furthermore, we identified 15 genes with changes in copy number that contribute to neurological development and/or function, among them CRMP1, SORCS2, SLC25A4, and HELT. Our results highlight the association of genes with changes in copy number at 4p and 4q subtelomeric regions and the DD phenotype. Cytogenomic characterization of additional cases with distal deletions should help clarifying the role of subtelomeric CNVs in neurological diseases. (C) 2016 S. Karger AG, Basel
- A Dominant ABCC8-Related Hyperinsulinism: Familial Case Report Moreira et al. ABCC8-Related Hyperinsulinism(2013) MOREIRA, M. C.; PIAZZON, F. B.; CARVALHO, M. D. F.; QUAIO, C. R. D. C.; DUTRA, A. B.; CECCON, M. E.; DELLA-MANNA, T.; TANNURI, U.; LEE, J. H.; ZERBINI, M. C. N.; BELLANNE-CHANTELOT, C.; LONLAY, P.; BERTOLA, D. R.; KIM, C. A.
- Post-mortem cytogenomic investigations in patients with congenital malformations(2016) DIAS, Alexandre Torchio; ZANARDO, Evelin Aline; DUTRA, Roberta Lelis; PIAZZON, Flavia Balbo; NOVO-FILHO, Gil Monteiro; MONTENEGRO, Marilia Moreira; NASCIMENTO, Amom Mendes; ROCHA, Mariana; MADIA, Fabricia Andreia Rosa; COSTA, Thais Virginia Moura Machado; MILANI, Cintia; SCHULTZ, Regina; GONCALVES, Fernanda Toledo; FRIDMAN, Cintia; YAMAMOTO, Guilherme Lopes; BERTOLA, Debora Romeo; KIM, Chong Ae; KULIKOWSKI, Leslie DomeniciCongenital anomalies are the second highest cause of infant deaths, and, in most cases, diagnosis is a challenge. In this study, we characterize patterns of DNA copy number aberrations in different samples of post-mortem tissues from patients with congenital malformations. Twenty-eight patients undergoing autopsy were cytogenomically evaluated using several methods, specifically, Multiplex Ligation-dependent Probe Amplification (MLPA), micro satellite marker analysis with a MiniFiler kit, FISH, a cytogenomic array technique and bidirectional Sanger sequencing, which were performed on samples of different tissues (brain, heart, liver, skin and diaphragm) preserved in RNAlater, in formaldehyde or by paraffin -embedding. The results identified 13 patients with pathogenic copy number variations (CNVs). Of these, eight presented aneuploidies involving chromosomes 13, 18, 21, X and Y (two presented inter- and intra-tissue mosaicism). In addition, other abnormalities were found, including duplication of the TYMS gene (18p1132); deletion of the CHL1 gene (3p26.3); deletion of the HIC1 gene (17p13.3); and deletion of the TOM1L2 gene (17p11.2). One patient had a pathogenic missense mutation of g.8535C > G (c.746C > G) in exon 7 of the FGFR3 gene consistent with Thanatophoric Dysplasia type I. Cytogenomic techniques were reliable for the analysis of autopsy material and allowed the identification of inter- and intra-tissue mosaicism and a better understanding of the pathogenesis of congenital malformations.
- Biochemical profile in an infant with neonatal hemochromatosis shows evidence of impairment of mitochondrial long-chain fatty acid oxidation(2019) BASTOS, Karina Lucio de Medeiros; QUAIO, Caio Robledo; LIMA, Fabiana Roberto; ARAUJO, Iana Manuelle; ARAUJO, Candice Alves Tavares; PIAZZON, Flavia Balbo; SILVA, Ismael Dale Cotrim Guerreiro da; BENEVIDES, Gabriel Nuncio; TANNURI, Ana Cristina; TANNURI, Uenis; AZEVEDO, Ramiro Anthero; KIM, Chong Ae
conferenceObject Cytogenomic Diagnosis of Congenital Heart Diseases(2013) KULIKOWSKI, Leslie; ZANARDO, Evelin; DUTRA, Roberta; PIAZZON, Flavia; DIAS, Alexandre; MONTENEGRO, Marilia; NOVO-FILHO, Gil; BASSO, Mariana; COSTA, Thais; NASCIMENTO, Amom; GRASSI, Marcilia; CARNEIRO-SAMPAIO, Magda; KIM, ChongconferenceObject Insights from indels profiling in a cohort of 123 Brazilian patients with congenital malformations and neurological disabilities(2018) DAMASCENO, J. G.; ZANARDO, E. A.; COSTA, T. V. M. M.; NOVO-FILHO, G. M.; MONTENEGRO, M. M.; MADIA, F. A. R.; DUTRA, R. L.; DIAS, A. T.; PIAZZON, F. B.; NASCIMENTO, A. M.; ROCHA, M.; MARCHI, F. A.; CHRISTOFOLINI, D. M.; CARVALHO, A. F. L.; MELARAGNO, M. I.; KIM, C. A.; KULIKOWSKI, L. D.- Cytogenomic assessment of the diagnosis of 93 patients with developmental delay and multiple congenital abnormalities: The Brazilian experience(2017) ZANARDO, Evelin Aline; DUTRA, Roberta Lelis; PIAZZON, Flavia Balbo; DIAS, Alexandre Torchio; NOVO-FILHO, Gil Monteiro; NASCIMENTO, Amom Mendes; MONTENEGRO, Marilia Moreira; DAMASCENO, Jullian Gabriel; MADIA, Fabricia Andreia Rosa; COSTA, Thais Virginia Moura Machado da; MELARAGNO, Maria Isabel; KIM, Chong Ae; KULIKOWSKI, Leslie DomeniciOBJECTIVE: The human genome contains several types of variations, such as copy number variations, that can generate specific clinical abnormalities. Different techniques are used to detect these changes, and obtaining an unequivocal diagnosis is important to understand the physiopathology of the diseases. The objective of this study was to assess the diagnostic capacity of multiplex ligation-dependent probe amplification and array techniques for etiologic diagnosis of syndromic patients. METHODS: We analyzed 93 patients with developmental delay and multiple congenital abnormalities using multiplex ligation-dependent probe amplifications and arrays. RESULTS: Multiplex ligation-dependent probe amplification using different kits revealed several changes in approximately 33.3% of patients. The use of arrays with different platforms showed an approximately 53.75% detection rate for at least one pathogenic change and a 46.25% detection rate for patients with benign changes. A concomitant assessment of the two techniques showed an approximately 97.8% rate of concordance, although the results were not the same in all cases. In contrast with the array results, the MLPA technique detected B70.6% of pathogenic changes. CONCLUSION: The obtained results corroborated data reported in the literature, but the overall detection rate was higher than the rates previously reported, due in part to the criteria used to select patients. Although arrays are the most efficient tool for diagnosis, they are not always suitable as a first-line diagnostic approach because of their high cost for large-scale use in developing countries. Thus, clinical and laboratory interactions with skilled technicians are required to target patients for the most effective and beneficial molecular diagnosis.
conferenceObject The role of CNVs in molecular mechanisms for rearrangements in 22q11.2 region diseases(2013) DUTRA, Roberta; ZANARDO, Evelin; PIAZZON, Flavia; DIAS, Alexandre; MONTENEGRO, Marilia; NOVO-FILHO, Gil; BASSO, Mariana; COSTA, Thais; NASCIMENTO, Amon; KIM, Chong; KULIKOWSKI, Leslie; MELARAGNO, Maria Isabel; MELO, Joana Barbosa