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1p13.2 deletion displays clinical features overlapping Noonan syndrome, likely related to NRAS gene haploinsufficiency

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Title
1p13.2 deletion displays clinical features overlapping Noonan syndrome, likely related to NRAS gene haploinsufficiency
Published in
Genetics and molecular biology, September 2016
DOI 10.1590/1678-4685-gmb-2016-0049
Pubmed ID
Authors

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, Pena, Sérgio D. J., Natália Duarte Linhares, Maíra Cristina Menezes Freire, Raony Guimarães Corrêa do Carmo Lis Cardenas, Heloisa Barbosa Pena, Katherine Lachlan, Bruno Dallapiccola, Carlos Bacino, Bruno Delobel, Paul James, Ann-Charlotte Thuresson, Göran Annerén, Sérgio D. J. Pena

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.

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The data shown below were compiled from readership statistics for 9 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 9 100%

Demographic breakdown

Readers by professional status Count As %
Student > Master 3 33%
Student > Bachelor 1 11%
Other 1 11%
Lecturer > Senior Lecturer 1 11%
Professor > Associate Professor 1 11%
Other 0 0%
Unknown 2 22%
Readers by discipline Count As %
Biochemistry, Genetics and Molecular Biology 4 44%
Agricultural and Biological Sciences 2 22%
Medicine and Dentistry 1 11%
Unknown 2 22%