Data/hora: 09/06/2024 13:53:40

Provedor de dados: | 74
País: | Brazil
Título: | 1p13.2 deletion displays clinical features overlapping Noonan syndrome, likely related to NRAS gene haploinsufficiency
Autores: | Linhares,Natália Duarte; Freire,Maíra Cristina Menezes; Cardenas,Raony Guimarães Corrêa do Carmo Lisboa; Pena,Heloisa Barbosa; Lachlan,Katherine; Dallapiccola,Bruno; Bacino,Carlos; Delobel,Bruno; James,Paul; Thuresson,Ann-Charlotte; Annerén,Göran; Pena,Sérgio D. J.
Data: | 2016-09-01
Ano: | 2016
Palavras-chave: | 1p13.2 deletion; Noonan syndrome type 6; NRAS gene; RASopathy; Unmasking heterozygosity.
Resumo: | Abstract Deletion-induced hemizygosity may unmask deleterious autosomal recessive variants and be a cause of the phenotypic variability observed in microdeletion syndromes. We performed complete exome sequencing (WES) analysis to examine this possibility in a patient with 1p13.2 microdeletion. Since the patient displayed clinical features suggestive of Noonan Syndrome (NS), we also used WES to rule out the presence of pathogenic variants in any of the genes associated with the different types of NS. We concluded that the clinical findings could be attributed solely to the 1p13.2 haploinsufficiency. Retrospective analysis of other nine reported patients with 1p13.2 microdeletions showed that six of them also presented some characteristics of NS. In all these cases, the deleted segment included the NRAS gene. Gain-of-function mutations of NRAS gene are causally related to NS type 6. Thus, it is conceivable that NRAS haploinsufficiency and gain-of-function mutations may have similar clinical consequences. The same phenomenon has been described for two other genes belonging to the Ras/MAPK pathway: MAP2K2 and SHOC2. In conclusion, we here report genotype-phenotype correlations in patients with chromosome 1p13.2 microdeletions and we propose that NRAS may be a critical gene for the NS characteristics in the patients.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572016000300349
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/1678-4685-GMB-2016-0049
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.39 n.3 2016
Fonte: | info:eu-repo/semantics/openAccess