Novel ANKRD11 gene mutation in an individual with a mild phenotype of KBG syndrome associated to a GEFS+ phenotypic spectrum: ... View Full Text


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Article Info

DATE

2019-12

AUTHORS

Rita Maria Alves, Paolo Uva, Marielza F. Veiga, Manuela Oppo, Fabiana C. R. Zschaber, Giampiero Porcu, Henrique P. Porto, Ivana Persico, Stefano Onano, Gianmauro Cuccuru, Rossano Atzeni, Lauro C. N. Vieira, Marcos V. A. Pires, Francesco Cucca, Maria Betânia P. Toralles, Andrea Angius, Laura Crisponi

ABSTRACT

BACKGROUND: KBG syndrome is a very rare autosomal dominant disorder, characterized by macrodontia, distinctive craniofacial findings, skeletal findings, post-natal short stature, and developmental delays, sometimes associated with seizures and EEG abnormalities. So far, there have been over 100 cases of KBG syndrome reported. CASE PRESENTATION: Here, we describe two sisters of a non-consanguineous family, both presenting generalized epilepsy with febrile seizures (GEFS+), and one with a more complex phenotype associated with mild intellectual disability, skeletal and dental anomalies. Whole exome sequencing (WES) analysis in all the family members revealed a heterozygous SCN9A mutation, p.(Lys655Arg), shared among the father and the two probands, and a novel de novo loss of function mutation in the ANKRD11 gene, p.(Tyr1715*), in the proband with the more complex phenotype. The reassessment of the phenotypic features confirmed that the patient fulfilled the proposed diagnostic criteria for KBG syndrome, although complicated by early-onset isolated febrile seizures. EEG abnormalities with or without seizures have been reported previously in some KBG cases. The shared variant, occurring in SCN9A, has been previously found in several individuals with GEFS+ and Dravet syndrome. CONCLUSIONS: This report describe a novel de novo variant in ANKRD11 causing a mild phenotype of KGB syndrome and further supports the association of monogenic pattern of SCN9A mutations with GEFS+. Our data expand the allelic spectrum of ANKRD11 mutations, providing the first Brazilian case of KBG syndrome. Furthermore, this study offers an example of how WES has been instrumental allowing us to better dissect the clinical phenotype under study, which is a multilocus variation aggregating in one proband, rather than a phenotypic expansion associated with a single genomic locus, underscoring the role of multiple rare variants at different loci in the etiology of clinical phenotypes making problematic the diagnostic path. The successful identification of the causal variant in a gene may not be sufficient, making it necessary to identify other variants that fully explain the clinical picture. The prevalence of blended phenotypes from multiple monogenic disorders is currently unknown and will require a systematic re-analysis of large WES datasets for proper diagnosis in daily practice. More... »

PAGES

16

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s12881-019-0745-7

DOI

http://dx.doi.org/10.1186/s12881-019-0745-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1111407288

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30642272


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curl -H 'Accept: application/n-triples' 'https://scigraph.springernature.com/pub.10.1186/s12881-019-0745-7'

Turtle is a human-readable linked data format.

curl -H 'Accept: text/turtle' 'https://scigraph.springernature.com/pub.10.1186/s12881-019-0745-7'

RDF/XML is a standard XML format for linked data.

curl -H 'Accept: application/rdf+xml' 'https://scigraph.springernature.com/pub.10.1186/s12881-019-0745-7'


 

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