Noonan syndrome ( NS) is a developmental disorder characterized by short stature, facial dysmorphia, congenital heart disease, and multiple skeletal and hematologic defects. NS is an autosomal dominant trait and is genetically heterogeneous. Gain of function of SHP-2, a protein tyrosine phosphatase that positively modulates RAS signaling, is observed in nearly 50% of affected individuals. Here, we report the identification of heterozygous KRAS gene mutations in two subjects exhibiting a severe NS phenotype with features overlapping those of cardiofaciocutaneous and Costello syndromes. Both mutations were de novo and affected exon 6, which encodes the C-terminal portion of KRAS isoform B but does not contribute to KRAS isoform A. Structural analysis indicated that both substitutions ( Va1152Gly and Asp153Val) perturb the conformation of the guanine ring-binding pocket of the protein, predicting an increase in the guanine diphosphate/guanine triphosphate ( GTP) dissociation rate that would favor GTP binding to the KRASB isoform and bypass the requirement for a guanine nucleotide exchange factor.

Carta, C., Pantaleoni, F., Bocchinfuso, G., Stella, L., Vasta, I., Sarkozy, A., et al. (2006). Germline missense mutations affecting KRAS isoform B are associated with a severe Noonan syndrome phenotype. AMERICAN JOURNAL OF HUMAN GENETICS, 79(1), 129-135 [10.1086/504394].

Germline missense mutations affecting KRAS isoform B are associated with a severe Noonan syndrome phenotype

BOCCHINFUSO, GIANFRANCO;STELLA, LORENZO;PALLESCHI, ANTONIO;
2006-01-01

Abstract

Noonan syndrome ( NS) is a developmental disorder characterized by short stature, facial dysmorphia, congenital heart disease, and multiple skeletal and hematologic defects. NS is an autosomal dominant trait and is genetically heterogeneous. Gain of function of SHP-2, a protein tyrosine phosphatase that positively modulates RAS signaling, is observed in nearly 50% of affected individuals. Here, we report the identification of heterozygous KRAS gene mutations in two subjects exhibiting a severe NS phenotype with features overlapping those of cardiofaciocutaneous and Costello syndromes. Both mutations were de novo and affected exon 6, which encodes the C-terminal portion of KRAS isoform B but does not contribute to KRAS isoform A. Structural analysis indicated that both substitutions ( Va1152Gly and Asp153Val) perturb the conformation of the guanine ring-binding pocket of the protein, predicting an increase in the guanine diphosphate/guanine triphosphate ( GTP) dissociation rate that would favor GTP binding to the KRASB isoform and bypass the requirement for a guanine nucleotide exchange factor.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore CHIM/02 - Chimica Fisica
English
Con Impact Factor ISI
SOMATIC PTPN11 MUTATIONS; FACIO-CUTANEOUS SYNDROME; K-RAS; LEOPARD-SYNDROME; CANCER-THERAPY; GTP-BINDING; MOUSE MODEL; NF1 GENE; LEUKEMIA; MUTANTS
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1474118/
Carta, C., Pantaleoni, F., Bocchinfuso, G., Stella, L., Vasta, I., Sarkozy, A., et al. (2006). Germline missense mutations affecting KRAS isoform B are associated with a severe Noonan syndrome phenotype. AMERICAN JOURNAL OF HUMAN GENETICS, 79(1), 129-135 [10.1086/504394].
Carta, C; Pantaleoni, F; Bocchinfuso, G; Stella, L; Vasta, I; Sarkozy, A; Digilio, C; Palleschi, A; Pizzuti, A; Grammatico, P; Zampino, G; Dallapiccola, B; Gelb, ; Bd, T
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/25510
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