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- W2394390012 abstract "<h3></h3> Costello syndrome (CS; MIM 214080) is a rare multiple congenital anomaly disorder in which individuals have characteristic dysmorphic craniofacial features, cardiac abnormalities, ectodermal and musculoskeletal anomalies, endocrinopathy, developmental delay, and a predisposition to neoplasia both benign and malignant. In this study, we examined a large, well-characterized cohort of patients with the clinical diagnosis of CS. We sequenced <i>HRAS</i> in 36 unrelated individuals with the clinical diagnosis of CS and three sets of parents and 10 normal controls. We screened for <i>HRAS</i> coding region mutations in an effort to define <i>HRAS</i> mutations in CS and attempt to establish a possible genotype-phenotype correlation. In addition, we sequenced <i>HRAS</i> to establish loss of heterozygosity in a rhabdomyosarcoma and fibrosarcoma from a CS patient. <i>HRAS</i> mutations were identified in 33 out of 36 (92%) patients with the clinical diagnosis of CS. Mutations were found in codon 12 or 13. Two different missense point mutations were identified in codon 12: 34G9A and 35G9C, predicting an amino acid substitution of gly12ser and gly12ala, respectively. The 34G9A transition mutation, the most common mutation observed in this cohort of patients, was found in 30 of 33 patients. Two patients were found to have a codon 12 35G9C transversion. One patient in the cohort had a codon 13 mutation: 37G9T transversion, predicting an amino acid substitution of gly13cys. Parental DNA samples from three CS patients with the 34G9A mutation did not harbor a mutation. <i>HRAS</i> was sequenced from DNA isolated from a rhabdomyosarcoma and fibrosarcoma from a patient who had the germline activating mutation 34GA. Sequence analysis demonstrated LOH of the wild-type allele of <i>HRAS</i> as demonstrated by detection of only 34A in exon 1. Our data show that the majority of Costello syndrome patients have de novo heterogeneous <i>HRAS</i> mutations. Furthermore, tumorigenesis in Costello syndrome patients is accompanied by additional somatic changes affecting the <i>HRAS</i> gene." @default.
- W2394390012 created "2016-06-24" @default.
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- W2394390012 date "2006-01-01" @default.
- W2394390012 modified "2023-09-23" @default.
- W2394390012 title "123 HRAS MUTATIONS IN COSTELLO SYNDROME: DETECTION OF ACTIVATING MUTATIONS IN CODON 12 AND CODON 13 AND LOSS OF HETEROZYGOSITY IN RHABDOMYOSARCOMA." @default.
- W2394390012 doi "https://doi.org/10.2310/6650.2005.x0004.122" @default.
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