NF1 microduplications: identification of seven nonrelated individuals provides further characterization of the phenotype.
Genet Med
; 14(5): 508-14, 2012 May.
Article
em En
| MEDLINE
| ID: mdl-22241097
ABSTRACT
PURPOSE:
Neurofibromatosis, type 1 (NF1) is an autosomal dominant disorder caused by mutations of the neurofibromin 1 (NF1) gene at 17q11.2. Approximately 5% of individuals with NF1 have a 1.4-Mb heterozygous 17q11.2 deletion encompassing NF1, formed through nonallelic homologous recombination (NAHR) between the low-copy repeats that flank this region. NF1 microdeletion syndrome is more severe than NF1 caused by gene mutations, with individuals exhibiting facial dysmorphisms, developmental delay (DD), intellectual disability (ID), and excessive neurofibromas. Although NAHR can also cause reciprocal microduplications, reciprocal NF1 duplications have been previously reported in just one multigenerational family and a second unrelated proband.METHODS:
We analyzed the clinical features in seven individuals with NF1 microduplications, identified among 48,817 probands tested in our laboratory by array-based comparative genomic hybridization.RESULTS:
The only clinical features present in more than one individual were variable DD/ID, facial dysmorphisms, and seizures. No neurofibromas were present. Three sets of parents were tested one duplication was apparently de novo, one inherited from an affected mother, and one inherited from a clinically normal father.CONCLUSION:
This is the first report comparing the phenotypes of nonrelated individuals with NF1 microduplications. This comparison will allow for further definition of this emerging microduplication syndrome.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Cromossomos Humanos Par 17
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Neurofibromatose 1
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Duplicação Gênica
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Neurofibromina 1
Tipo de estudo:
Diagnostic_studies
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Observational_studies
Limite:
Adolescent
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Adult
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Child
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Child, preschool
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Female
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Humans
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Infant
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Male
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Newborn
Idioma:
En
Revista:
Genet Med
Assunto da revista:
GENETICA MEDICA
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Estados Unidos