title: Identification of a novel de novo mutation of CREBBP in a patient with Rubinstein-Taybi syndrome by targeted next-generation sequencing: a case report.
abstract: Rubinstein-Taybi syndrome (RSTS) is a rare autosomal dominant congenital disorder (prevalence, 1:125000-720000) characterized by broad thumbs and halluces, facial dysmorphism, psychomotor development delay, skeletal defects, abnormalities in the posterior fossa, and short stature. The purpose of this study was to use targeted exome sequencing to identify the genetic cause of RSTS in a 6.5-year-old girl presenting typical features of this condition. Targeted exome sequencing of the patient DNA revealed de novo transition c.1066C>T corresponding to a novel nonsense mutation p.Q356X in the CREB-binding protein gene, CREBBP, whose haploinsufficiency is responsible for 50% to 60% of the RSTS cases. Based on comparing the clinical manifestations of our patient with those of patients carrying similar mutations, we supposed that haploinsufficiency is the possible functional consequence of p.Q356X mutation by creation of a loss-of-function CREBBP allele due to a premature stop codon and RSTS phenotype. Our findings expand the spectrum of mutations associated with this condition.
authors.affiliation: Molecular Medicine Centre, Medical University of Sofia, 1431 Sofia, Bulgaria; Department of Medical Chemistry and Biochemistry, Medical Faculty, Medical University of Sofia, 1431 Sofia, Bulgaria. Electronic address: kkamenarova@mmcbg.org.
authors.forename: Kunka
authors.initials: K
authors.lastname: Kamenarova
authors.affiliation: Clinic of Pediatrics, University Hospital "Alexandrovska", 1431 Sofia, Bulgaria.
authors.forename: Emil
authors.initials: E
authors.lastname: Simeonov
authors.affiliation: Molecular Medicine Centre, Medical University of Sofia, 1431 Sofia, Bulgaria; Department of Medical Chemistry and Biochemistry, Medical Faculty, Medical University of Sofia, 1431 Sofia, Bulgaria.
authors.forename: Reni
authors.initials: R
authors.lastname: Tzveova
authors.affiliation: Molecular Medicine Centre, Medical University of Sofia, 1431 Sofia, Bulgaria; Department of Medical Chemistry and Biochemistry, Medical Faculty, Medical University of Sofia, 1431 Sofia, Bulgaria.
authors.forename: Daniela
authors.initials: D
authors.lastname: Dacheva
authors.affiliation: Imaging Department, University Hospital "St Ivan Rilski", 1431 Sofia, Bulgaria.
authors.forename: Marin
authors.initials: M
authors.lastname: Penkov
authors.affiliation: National Genetic Laboratory, University Hospital of Obstetrics and Gynecology, 1431 Sofia, Bulgaria.
authors.forename: Ivo
authors.initials: I
authors.lastname: Kremensky
authors.affiliation: Clinic of Pediatrics, University Hospital "Alexandrovska", 1431 Sofia, Bulgaria.
authors.forename: Penka
authors.initials: P
authors.lastname: Perenovska
authors.affiliation: Molecular Medicine Centre, Medical University of Sofia, 1431 Sofia, Bulgaria; Department of Medical Chemistry and Biochemistry, Medical Faculty, Medical University of Sofia, 1431 Sofia, Bulgaria.
authors.forename: Vanio
authors.initials: V
authors.lastname: Mitev
authors.affiliation: Molecular Medicine Centre, Medical University of Sofia, 1431 Sofia, Bulgaria; Department of Medical Chemistry and Biochemistry, Medical Faculty, Medical University of Sofia, 1431 Sofia, Bulgaria.
authors.forename: Radka
authors.initials: R
authors.lastname: Kaneva
mesh_terms: D050882:CREB-Binding Protein / Q000235:genetics*; D002648:Child; D018389:Codon, Nonsense; D004252:DNA Mutational Analysis / Q000379:methods*; D059472:Exome; D005260:Female; D020022:Genetic Predisposition to Disease; D057895:Haploinsufficiency; D059014:High-Throughput Nucleotide Sequencing; D006801:Humans; D010641:Phenotype; D011237:Predictive Value of Tests; D012415:Rubinstein-Taybi Syndrome / Q000175:diagnosis / Q000235:genetics*
chemical_list: D018389:Codon, Nonsense; D050882:CREB-Binding Protein; C494363:CREBBP protein, human
keywords: CREB binding protein; Genotype-phenotype correlation; Novel mutation; Rubinstein-Taybi syndrome; Targeted exome sequencing