ALEXANDRE TORCHIO DIAS
Projetos de Pesquisa
Unidades Organizacionais
LIM/03 - Laboratório de Medicina Laboratorial, Hospital das Clínicas, Faculdade de Medicina
8 resultados
Resultados de Busca
Agora exibindo 1 - 8 de 8
conferenceObject Molecular autopsy reveals clues for genetic basis of congenital valve defect(2019) MADIA, F. A. R.; DIAS, A. T.; ZANARDO, E. A.; DAMASCENO, J. G.; NASCIMENTO, A. M.; COSTA, T. V. M. M.; CHEHIMI, S. N.; NOVO-FILHO, G. M.; MONTENEGRO, M. M.; OLIVEIRA, Y. G.; FREITAS, A. B.; VIEIRA, L. L.; SCHULTZ, R.; GONCALVES, F. T.; FRIDMAN, C.; KIM, C. A.; KULIKOWSKI, L. D.conferenceObject Investigating the CNVs in routine diagnostics using WES and array in Brazilian patients(2019) ZANARDO, E. A.; CHEHIMI, S. N.; MONTEIRO, F. P.; MADIA, F. A. R.; NOVO-FILHO, G. M.; DIAS, A. T.; MONTENEGRO, M. M.; OLIVEIRA, Y. G.; VIEIRA, L. L.; ROCHA, M.; BRASIL, A. S.; NASCIMENTO, A. M.; COSTA, T. V. M. M.; DAMASCENO, J. G.; KOK, F.; KIM, C. A.; KULIKOWSKI, L. D.- Efficacy of MLPA for detection of Y-chromosome microdeletions in infertile Brazilian patients(2020) FRANCHIM, C. S.; SOARES-JUNIOR, J. M.; SERAFINI, P. C.; MONTELEONE, P. A. A.; COCCUZZA, M. S.; ZANARDO, E. A.; MONTENEGRO, M. M.; DIAS, A. T.; KULIKOWSKI, L. D.; BARACAT, E. C.Purpose Worldwide publications follow the gold standard method-the polymerase chain reaction (PCR)-for detecting Y-chromosome microdeletions; however, markers are frequently variable between the studies. Can we detect the deletions by another molecular method with more genomic coverage? The Y chromosome harbors several different genes responsible for testicular development and spermatogenesis, and its repetitive conformation predisposes it to complex rearrangements that have clinical impact. Our aim was to evaluate a molecular diagnostic method, the Multiplex Ligand Probe-dependent Amplification (MLPA), which is also a valuable ancillary method for the identification of deletions, duplications, and rearrangements in a single and faster reaction, leading to a better comprehension of patients' phenotypes, and should be considered a useful tool for detection of Y chromosome deletions. Methods This is a study of diagnostic accuracy (transversal prospective study) conducted to investigate Y-chromosome deletions in 84 individuals through PCR and MLPA methods. Forty-three infertile men (azoospermic and oligozoospermic) and 41 controls (40 fertile men and 1 normal karyotyped woman) were analyzed by PCR and MLPA techniques. Results We diagnosed seven (7) deletions (16.2%) by PCR and 9 with MLPA (21%). In addition, we found five (5) duplications and a suggestive mosaic. Conclusion Our results demonstrate that MLPA technique is valuable in the investigation of microdeletions and microduplications. Besides deletions, duplications can cause instability of chromosome genes, possibly leading to infertility. Both studied techniques provide an advantageous diagnostic strategy, thus enabling a better genetic counseling.
conferenceObject Repetitive elements associated with breakpoints of distal 5p deletions suggest mechanisms mediating these rearrangements(2019) CHEHIMI, S. N.; ZANARDO, E. A.; MADIA, F. A. R.; DIAS, A. T.; NOVO-FILHO, G. M.; MONTENEGRO, M. M.; NASCIMENTO, A. M.; DAMASCENO, J. G.; OLIVEIRA, Y. G.; VIEIRA, L. L.; KIM, C. A.; KULIKOWSKI, L. D.conferenceObject Multi-gene panel testing improves diagnosis in Brazilian patients with Early-Onset Epilepsy(2019) NOVO FILHO, G. M.; DIAS, A. T.; NASCIMENTO, A. M.; DAMASCENO, J. G.; ZANARDO, E. A.; CHEHIMI, S. N.; MADIA, F. A. R.; AKL, O. S.; AKL, O. S.; MONTENEGRO, M. M.; OLIVEIRA, Y. G.; VIEIRA, L. L.; MANREZA, M. L. G.; KULIKOWSKI, L. D.conferenceObject 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.conferenceObject Sequencing of synthetic long reads to elucidate structure and mechanisms for formation in patients with genomic structural alterations(2018) NOVO FILHO, G. M.; MAFRA, F.; MONTENEGRO, M. M.; ZANARDO, E. A.; DIAS, A. T.; NASCIMENTO, A. M.; DAMASCENO, J. G.; MADIA, F. A. R.; COSTA, T. V. M. M.; OLIVEIRA, Y. G.; KAMINSKI, C.; GARIFALLOU, J.; GONZALES, M. V.; TIAN, L.; KAO, C.; KIM, C. A.; PELLEGRINO, R.; HAKONARSON, H.; KULIKOWSKI, L. D.- A Multicentric Brazilian Investigative Study of Copy Number Variations in Patients with Congenital Anomalies and Intellectual Disability(2018) CERONI, J. R. M.; DUTRA, R. L.; HONJO, R. S.; LLERENA JR., J. C.; ACOSTA, A. X.; MEDEIROS, P. F. V.; GALERA, M. F.; ZANARDO, E. A.; PIAZZON, F. B.; DIAS, A. T.; NOVO-FILHO, G. M.; MONTENEGRO, M. M.; MADIA, F. A. R.; BERTOLA, D. R.; MELO, J. B. de; KULIKOWSKI, L. D.; KIM, C. A.Genomic imbalances are the most common cause of congenital anomalies (CA) and intellectual disability (ID). The aims of this study were to identify copy number variations (CNVs) in 416 patients with CA and ID from 5 different genetics centers within 4 different states by using the Multiplex Ligation-dependent Probe Amplification (MLPA) technique and to apply the chromosomal microarray (CMA) methodology in selected cases. The samples were analyzed by MLPA kits P064, P036, P070 and P250. Positive results were found in 97/416 (23.3%) patients. CMA was applied in 14 selected cases. In 6/14 (42.85%) patients, CMA detected other copy number variations not detected by the MLPA studies. Although CMA is indispensable for genotype refinement, the technique is still unfeasible in some countries as a routine analysis due to economic and technical limitations. In these cases, clinical evaluation followed by karyotyping and MLPA analysis is a helpful and affordable solution for diagnostic purposes.