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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Relatively high frequency of non-synonymous GLI2 variants in patients with congenital hypopituitarism without holoprosencephaly

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Autor(es):
Franca, Marcela M. [1] ; Jorge, Alexander A. L. [1] ; Carvalho, Luciani R. S. [1] ; Costalonga, Everlayny F. [1] ; Otto, Aline P. [1] ; Correa, Fernanda A. [1] ; Mendonca, Berenice B. [1] ; Arnhold, Ivo J. P. [1]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Fac Med, Lab Hormonios & Genet Mol LIM 42, Hosp Clin, Unidade Endocrinol Desenvolvimento, Disciplina End, Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: CLINICAL ENDOCRINOLOGY; v. 78, n. 4, p. 551-557, APR 2013.
Citações Web of Science: 20
Resumo

Objective GLI2 is a downstream transcription factor in Sonic Hedgehog signalling, acting early in ventral forebrain and pituitary development. Heterozygous nonsense GLI2 mutations have been reported in patients with isolated or combined pituitary hormone deficiency (CPHD), with or without holoprosencephaly. The aim of this study was to screen for GLI2 mutations in a large cohort of patients with congenital GH deficiency. Design and Patients The GLI2 coding region of 41 patients with severe isolated GH deficiency (IGHD) and 136 patients with CPHD was amplified by PCR using intronic primers and sequenced. The frequency of GLI2 variants was verified in up to 155 Brazilian controls and in the 1000 Genomes database. The consequences of allelic variants were analysed by the Polyphen, SIFT, Mutationtaster and SNAP prediction sites. Results Eighteen different heterozygous non-synonymous GLI2 variants were identified in 24 patients. Twenty-three patients had CPHD and one had IGHD. Two patients had additional diabetes insipidus, indicating deficiencies of anterior and posterior pituitary lobes. The posterior pituitary lobe on MRI was ectopic in 16, not visible in 4, normally placed in 2 and imaging was not available in two patients, but there were no signs of holoprosencephaly. Sixteen GLI2 variants were considered deleterious in at least one of the prediction sites. Conclusions A relatively high frequency of non-synonymous GLI2 variants was identified in patients with congenital GH deficiency without other brain defects, and most of these patients presented with CPHD and an ectopic posterior pituitary lobe. In vitro functional assays may contribute to ascertain the deleterious consequences of these variants. (AU)

Processo FAPESP: 05/04726-0 - Caracterização molecular das doenças endócrinas congênitas que afetam o crescimento e o desenvolvimento
Beneficiário:Ana Claudia Latronico Xavier
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 07/56490-5 - Estudo da etiologia do hipopituitarismo congênito: análise dos genes GHRH e GLI2
Beneficiário:Marcela Moura Franca
Linha de fomento: Bolsas no Brasil - Doutorado Direto