ANNA FLAVIA FIGUEREDO BENEDETTI
Projetos de Pesquisa
Unidades Organizacionais
LIM/42 - Laboratório de Hormônios e Genética Molecular, Hospital das Clínicas, Faculdade de Medicina
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conferenceObject Congenital Hypopituitarism: Stem Cell Accumulation in Mutants with Developmental Arrest and Depletion in Mutants with Hyperplasia(2014) CHANG, Claudia Veiga; ARAUJO, Ricardo Viera; CIRQUEIRA, Cinthya Santos; PARFIENIUK, Agata; GUZZO, Mariana F.; BENEDETTI, Anna Flavia F.; SOARES, Ibere C.; MILLAN, Maria Ines Perez; CAMPER, Sally Ann; CARVALHO, Luciani R. S.conferenceObject Gene Identification in Patients with Hypopituitarism: Next Generation Exome Sequencing Experience(2014) FANG, Qing; ARNHOLD, Ivo J. P.; BENEDETTI, Anna Flavia F.; MENDONAA, Berenice Bilharinho; BRUE, Thierry; CARVALHO, Luciani R. S.; CASTINETTI, Frederic; CORREA, Fernanda de Azevedo; LI, Jun Z.; MA, Qianyi; REYNAUD, Rachel; CAMPER, Sally Ann- The phenotypic spectrum associated with OTX2 mutations in humans(2021) GREGORY, Louise C.; GERGICS, Peter; NAKAGUMA, Marilena; BANDO, Hironori; PATTI, Giuseppa; MCCABE, Mark J.; FANG, Qing; MA, Qianyi; OZEL, Ayse Bilge; LI, Jun Z.; POINA, Michele Moreira; JORGE, Alexander A. L.; BENEDETTI, Anna F. Figueredo; LERARIO, Antonio M.; ARNHOLD, Ivo J. P.; MENDONCA, Berenice B.; MAGHNIE, Mohamad; CAMPER, Sally A.; CARVALHO, Luciani R. S.; DATTANI, Mehul T.Objective: The transcription factor OTX2 is implicated in ocular, craniofacial, and pituitary development.& nbsp; Design: We aimed to establish the contribution of OTX2 mutations in congenital hypopituitarism patients with/without eye abnormalities, study functional consequences, and establish OTX2 expression in the human brain, with a view to investigate the mechanism of action.& nbsp; Methods: We screened patients from the UK (n = 103), international centres (n = 24), and Brazil (n = 282); 145 were within the septo-optic dysplasia spectrum, and 264 had no eye phenotype. Transactivation ability of OTX2 variants was analysed in murine hypothalamic GT1-7 neurons. In situ hybridization was performed on human embryonic brain sections. Genetically engineered mice were generated with a series of C-terminal OTX2 variants.& nbsp; Results: Two chromosomal deletions and six haploinsufficient mutations were identified in individuals with eye abnormalities; an affected relative of one patient harboured the same mutation without an ocular phenotype. OTX2 truncations led to significant transactivation reduction. A missense variant was identified in another patient without eye abnormalities; however, studies revealed it was most likely not causative. In the mouse, truncations proximal to aa219 caused anophthalmia, while distal truncations and the missense variant were tolerated. During human embryogenesis, OTX2 was expressed in the posterior pituitary, retina, ear, thalamus, choroid plexus, and partially in the hypothalamus, but not in the anterior pituitary.& nbsp; Conclusions: OTX2 mutations are rarely associated with hypopituitarism in isolation without eye abnormalities, and may be variably penetrant, even within the same pedigree. Our data suggest that the endocrine phenotypes in patients with OTX2 mutations are of hypothalamic origin.
- Genetic diagnosis of congenital hypopituitarism by a target gene panel: novel pathogenic variants in GLI2, OTX2 and GHRHR(2019) NAKAGUMA, Marilena; CORREA, Fernanda A.; SANTANA, Lucas S.; BENEDETTI, Anna F. F.; V, Ricardo Perez; HUAYLLAS, Martha K. P.; MIRAS, Mirta B.; FUNARI, Mariana F. A.; LERARIO, Antonio M.; MENDONCA, Berenice B.; CARVALHO, Luciani R. S.; JORGE, Alexander A. L.; ARNHOLD, Ivo J. P.Aim: Congenital hypopituitarism has an incidence of 1:3500-10,000 births and is defined by the impaired production of pituitary hormones. Early diagnosis has an impact on management and genetic counselling. The clinical and genetic heterogeneity of hypopituitarism poses difficulties to select the order of genes to analyse. The objective of our study is to screen hypopituitarism genes (candidate and previously related genes) simultaneously using a target gene panel in patients with congenital hypopituitarism. Methods: Screening of 117 subjects with congenital hypopituitarism for pathogenic variants in 26 genes associated with congenital hypopituitarism by massively parallel sequencing using a customized target gene panel. Results: We found three novel pathogenic variants in OTX2 c.295C>T:p.Gln99*, GLI2 c.1681G>T:p.Glu561* and GHRHR c.820_821insC:p.Asp274Alafs*113, and the previously reported variants in GHRHR c.57+1G>A and PROP1 [c.301_302delAG];(c.109+1G>A]. Conclusions: Our results indicate that a custom-designed panel is an efficient method to screen simultaneously variants of biological and clinical relevance for congenital GH deficiency. A genetic diagnosis was possible in 5 out of 117 (4%) patients of our cohort. We identified three novel pathogenic variants in GHRHR, OTX2 and GLI2 expanding the spectrum of variants associated with congenital hypopituitarism.
conferenceObject Congenital Hypopituitarism: Stem Cell Accumulation in Mutants with Developmental Arrest and Depletion in Mutants with Hyperplasia(2014) CHANG, Claudia Veiga; ARAUJO, Ricardo Viera; CIRQUEIRA, Cinthya Santos; PARFIENIUK, Agata; GUZZO, Mariana F.; BENEDETTI, Anna Flavia F.; SOARES, Ibere C.; MILLAN, Maria Ines Perez; CAMPER, Sally Ann; CARVALHO, Luciani R. S.