LIM/42 - Laboratório de Hormônios e Genética Molecular
URI Permanente desta comunidade
O Laboratório de Hormônios e Genética Molecular é ligado ao Departamento de Clínica Médica da Faculdade de Medicina da Universidade de São Paulo (FMUSP).
Linhas de pesquisa: distúrbios da determinação e diferenciação sexual; genética molecular; endocrinologia do desenvolvimento; distúrbios puberais; endocrinologia do desenvolvimento; genética molecular; tumorigênese adrenocortical; distúrbios do crescimento; endocrinologia do desenvolvimento; biologia molecular e transcrição gênica; hiperplasia adrenal congênita; transcrição gênica; genética molecular; receptor de andrógenos; citocromos hepáticos P450; disfunções e tumorigênese adrenocortical; genética molecular e tumorigênese hipofisária na doença de Cushing.
Site oficial: http://limhc.fm.usp.br/portal/lim42-laboratorio-de-hormonios-e-genetica-molecular/
Linhas de pesquisa: distúrbios da determinação e diferenciação sexual; genética molecular; endocrinologia do desenvolvimento; distúrbios puberais; endocrinologia do desenvolvimento; genética molecular; tumorigênese adrenocortical; distúrbios do crescimento; endocrinologia do desenvolvimento; biologia molecular e transcrição gênica; hiperplasia adrenal congênita; transcrição gênica; genética molecular; receptor de andrógenos; citocromos hepáticos P450; disfunções e tumorigênese adrenocortical; genética molecular e tumorigênese hipofisária na doença de Cushing.
Site oficial: http://limhc.fm.usp.br/portal/lim42-laboratorio-de-hormonios-e-genetica-molecular/
Índice h
Scopus: 48
Navegar
Coleções desta Comunidade
- LIM/42 - Laboratório de Hormônios e Genética Molecular
- LIM/42 - Laboratório de Hormônios e Genética Molecular
- LIM/42 - Laboratório de Hormônios e Genética Molecular
Submissões Recentes
A Small Supernumerary Xp Marker Chromosome Including Genes NR0B1 and MAGEB Causing Partial Gonadal Dysgenesis and Gonadoblastoma
(2022) NISHI, M. Y.; JúNIOR, J. A. D. Faria; KREPISCHI, A. C. V.; MORAES, D. R. De; COSTA, S. S. Da; SILVA, E. S. D. N.; COSTA, E. M. F.; MENDONCA, B. B.; DOMENICE, S.
Copy number variations of several genes involved in the process of gonadal determination have been identified as a cause of 46,XY differences of sex development. We report a non-syndromic 14-year-old female patient who was referred with primary amenorrhea, absence of breast development, and atypical genitalia. Her karyotype was 47,XY,+mar/46,XY, and FISH analysis revealed the X chromosome origin of the marker chromosome. Array-CGH data identified a pathogenic 2.0-Mb gain of an Xp21.2 segment containing NR0B1/DAX1 and a 1.9-Mb variant of unknown significance from the Xp11.21p11.1 region. This is the first report of a chromosomal microarray analysis to reveal the genetic content of a small supernumerary marker chromosome detected in a 47,XY,+der(X)/46,XY karyotype in a non-syndromic girl with partial gonadal dysgenesis and gonadoblastoma. Our findings indicate that the mosaic presence of the small supernumerary Xp marker, encompassing the NR0B1/DAX1 gene, may have been the main cause of dysgenetic testes development, although the role of MAGEB and other genes mapped to the Xp21 segment could not be completely ruled out.
Variants in 46,XY DSD-Related Genes in Syndromic and Non-Syndromic Small for Gestational Age Children with Hypospadias
(2022) BRAGA, B. L.; GOMES, N. L.; NISHI, M. Y.; FREIRE, B. L.; BATISTA, R. L.; FARIA JUNIOR, J. A. D.; FUNARI, M. F. A.; BENEDETTI, A. F. F.; NARCIZO, A. De Moraes; CARDOSO, L. Cavalca; LERARIO, A. M.; GUERRA-JUNIOR, G.; COSTA, E. M. F.; DOMENICE, S.; JORGE, A. A. L.; MENDONCA, B. B.
Hypospadias is a common congenital disorder of male genital formation. Children born small for gestational age (SGA) present a high frequency of hypospadias of undetermined etiology. No previous study investigated the molecular etiology of hypospadias in boys born SGA using massively parallel sequencing. Our objective is to report the genetic findings of a cohort of patients born SGA with medium or proximal hypospadias. We identified 46 individuals with this phenotype from a large cohort of 46,XY DSD patients, including 5 individuals with syndromic features. DNA samples from subjects were studied by either whole exome sequencing or target gene panel approach. Three of the syndromic patients have 5 main clinical features of Silver-Russell syndrome (SRS) and were first studied by MLPA. Among the syndromic patients, loss of DNA methylation at the imprinting control region H19/IGF2 was identified in 2 individuals with SRS clinical diagnosis. Two novel pathogenic variants in compound heterozygous state were identified in the CUL7 gene establishing the diagnosis of 3M syndrome in one patient, and a novel homozygous variant in TRIM37 was identified in another boy with Mulibrey nanism phenotype. Among the non-syndromic subjects, 7 rare heterozygous variants were identified in 6 DSD-related genes. However, none of the variants found can explain the phenotype by themselves. In conclusion, a genetic defect that clarifies the etiology of hypospadias was not found in most of the non-syndromic SGA children, supporting the hypothesis that multifactorial causes, new genes, and/or unidentified epigenetic defects may have an influence in this condition.
WT1 Pathogenic Variants are Associated with a Broad Spectrum of Differences in Sex Development Phenotypes and Heterogeneous Progression of Renal Disease
(2022) FERRARI, M. T. M.; WATANABE, A.; SILVA, T. E. Da; GOMES, N. L.; BATISTA, R. L.; NISHI, M. Y.; PAULA, L. C. P. De; COSTA, E. C.; COSTA, E. M. F.; CUKIER, P.; ONUCHIC, L. F.; MENDONCA, B. B.; DOMENICE, S.
Wilms' tumor suppressor gene 1 (WT1) plays an essential role in urogenital and kidney development. Heterozygous germline pathogenic allelic variants of WT1 have been classically associated with Denys-Drash syndrome (DDS) and Frasier syndrome (FS). Usually, exonic pathogenic missense variants in the zinc finger region are the cause of DDS, whereas pathogenic variants affecting the canonic donor lysine-threonine-serine splice site in intron 9 cause FS. Phenotypic overlap between WT1 disorders has been frequently observed. New WT1 variant-associated phenotypes, such as 46,XX testicular/ovarian-testicular disorders of sex development (DSD) and primary ovarian insufficiency, have been reported. In this report, we describe the phenotypes and genotypes of 7 Brazilian patients with pathogenic WT1 variants. The molecular study involved Sanger sequencing and massively parallel targeted sequencing using a DSD-associated gene panel. Six patients (5 with a 46,XY karyotype and 1 with a 46,XX karyotype) were initially evaluated for atypical genitalia, and a 46,XY patient with normal female genitalia sought medical attention for primary amenorrhea. Germ cell tumors were identified in 2 patients, both with variants affecting alternative splicing of WT1 between exons 9 and 10. Two pathogenic missense WT1 variants were identified in two 46,XY individuals with Wilms' tumors; both patients were <1 year of age at the time of diagnosis. A novel WT1 variant, c.1453_1456 (p.Arg485Glyfs∗14), was identified in a 46,XX patient with testicular DSD. Nephrotic proteinuria was diagnosed in all patients, including 3 who underwent renal transplantation after progressing to end-stage kidney disease. The expanding phenotypic spectrum associated with WT1 variants in XY and XX individuals confirms their pivotal role in gonadal and renal development as well as in tumorigenesis, emphasizing the clinical implications of these variants in genetic diagnosis.
Frequency of radiotherapy-induced malignancies in Li-Fraumeni syndrome patients with early breast cancer and influence of the radiotherapy technique
(2023) PETRY, V.; BONADIO, R. Colombo; MOUTINHO, K.; SENNA, L.; TESTA, L.; FRAGOSO, M. C.; DIZ, M. D. P. Estevez
RESPONSE TO RHGH THERAPY IN SHORT CHILDREN BORN AT VERY LOW BIRTH WEIGHT
(2023) MALAQUIAS, A. C.; HOMMA, T.; DANTAS, M. C. B.; FREIRE, B. L.; ALBUQUE, E. V. A.; ARNHOLD, I. J. P.; VASQUES, G. A.; JORGE, A. A. L.