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pulmonary valve stenosis/l tyrosin
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Protein-tyrosine phosphatase, nonreceptor type 11 mutation analysis and clinical assessment in 45 patients with Noonan syndrome.
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We report on PTPN11 (protein-tyrosine phosphatase, nonreceptor type 11) mutation analysis and clinical assessment in 45 patients with Noonan syndrome. Sequence analysis was performed for all of the coding exons 1-15 of PTPN11, revealing a novel 3-bp deletion mutation and 10 recurrent missense
Structural insights into Noonan/LEOPARD syndrome-related mutants of protein-tyrosine phosphatase SHP2 (PTPN11).
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BACKGROUND
The ubiquitous non-receptor protein tyrosine phosphatase SHP2 (encoded by PTPN11) plays a key role in RAS/ERK signaling downstream of most, if not all growth factors, cytokines and integrins, although its major substrates remain controversial. Mutations in PTPN11 lead to several distinct
Involvement of EphA2-mediated tyrosine phosphorylation of Shp2 in Shp2-regulated activation of extracellular signal-regulated kinase.
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Shp2 is a positive regulator for Erk activation downstream of receptor tyrosine kinases for growth factors. It has been controversial how Shp2 induces Erk activation. We here demonstrate that EphA2 is responsible for Shp2-mediated Erk activation by phosphorylating Tyr542 and Tyr580 of Shp2 in the
Mutations in PTPN11, encoding the protein tyrosine phosphatase SHP-2, cause Noonan syndrome.
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Noonan syndrome (MIM 163950) is an autosomal dominant disorder characterized by dysmorphic facial features, proportionate short stature and heart disease (most commonly pulmonic stenosis and hypertrophic cardiomyopathy). Webbed neck, chest deformity, cryptorchidism, mental retardation and bleeding
Acute myelomonocytic leukemia in a boy with LEOPARD syndrome (PTPN11 gene mutation positive).
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The LEOPARD syndrome is a complex of multisystemic congenital abnormalities characterized by lentiginosis, electrocardiographic conduction abnormalities, ocular hypertelorism, pulmonary stenosis, abnormalities of genitalia, retardation of growth, and deafness (sensorineural). Mutations in PTPN11, a
Phenotypical diversity of patients with LEOPARD syndrome carrying the worldwide recurrent p.Tyr279Cys PTPN11 mutation.
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LEOPARD syndrome (LS, OMIM 151100) is a rare monogenic disorder. The name is an acronym of its major features such as multiple lentigines, electrocardiographic conduction defects, ocular hypertelorism, pulmonary stenosis, abnormalities of genitalia, retardation of growth and sensorineural deafness.
Elevated Ca2+ transients and increased myofibrillar power generation cause cardiac hypercontractility in a model of Noonan syndrome with multiple lentigines.
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Noonan syndrome with multiple lentigines (NSML) is primarily caused by mutations in the nonreceptor protein tyrosine phosphatase SHP2 and associated with congenital heart disease in the form of pulmonary valve stenosis and hypertrophic cardiomyopathy (HCM). Our goal was to elucidate the cellular
Familial LEOPARD Syndrome With Hypertrophic Cardiomyopathy
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Multiple lentigines syndrome is an autosomal dominant inherited condition with variable expressivity that is also known as LEOPARD syndrome. LEOPARD stands for lentigines, electrocardiographic conduction defects, ocular hypertelorism, pulmonary valve stenosis, abnormalities of genitalia, retardation
Noonan syndrome mutation Q79R in Shp2 increases proliferation of valve primordia mesenchymal cells via extracellular signal-regulated kinase 1/2 signaling.
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The molecular pathways regulating valve development are only partially understood. Recent studies indicate that dysregulation of mitogen-activated protein kinase (MAPK) signaling might play a major role in the pathogenesis of congenital valvular malformations, and, in this study, we explored the
The case of 17-year-old male with LEOPARD syndrome.
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LEOPARD syndrome is a phenotypic expression of mutations in several genes: PTPN11, RAF1, and BRAF. All these genes are responsible for Ras/MARK signaling pathway, which are important for cell cycle regulation, differentiation, growth, and aging. Mutations result in anomalies of skin, skeletal, and
The cardiofaciocutaneous syndrome.
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The cardiofaciocutaneous (CFC) syndrome is a condition of sporadic occurrence, with patients showing multiple congenital anomalies and mental retardation. It is characterised by failure to thrive, relative macrocephaly, a distinctive face with prominent forehead, bitemporal constriction, absence of
PTPN11 mutations are associated with mild growth hormone resistance in individuals with Noonan syndrome.
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BACKGROUND
Noonan syndrome is frequently associated with an unclear disturbance of GH secretion. Half the individuals with Noonan syndrome carry a heterozygous mutation of the nonreceptor-type protein tyrosine phosphatase, Src homology region 2-domain phosphatase-2 (SHP-2), encoded by PTPN11, which
Heterozygous deletion of AKT1 rescues cardiac contractility, but not hypertrophy, in a mouse model of Noonan Syndrome with Multiple Lentigines.
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Noonan Syndrome with Multiple Lentigines (NSML) is associated with congenital heart disease in form of pulmonary valve stenosis and hypertrophic cardiomyopathy (HCM). Genetically, NSML is primarily caused by mutations in the non-receptor protein tyrosine phosphatase SHP2. Importantly, certain SHP2
LEOPARD Syndrome Caused by Tyr279Cys Mutation in the PTPN11 Gene.
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LEOPARD syndrome (LS) is an acronym consisting of lentigines, electrocardiographic abnormalities, ocular hypertelorism, pulmonary valve stenosis, abnormal genitalia, retardation of growth and deafness. However, hypertrophic cardiomyopathy, the most frequent cause of sudden cardiac death in young
Negative regulation of Stat3 by activating PTPN11 mutants contributes to the pathogenesis of Noonan syndrome and juvenile myelomonocytic leukemia.
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Noonan syndrome (NS) is an autosomal dominant congenital disorder characterized by multiple birth defects including heart defects and myeloproliferative disease (MPD). Approximately 50% of NS patients have germline gain-of-function mutations in PTPN11, which encodes the protein-tyrosine phosphatase,
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