Search results for "MUTATION"

Absence of p53 gene mutations in hepatocarcinomas from a Mediterranean area of Spain

1999

The incidence of p53 gene abnormalities in human hepatocellular carcinoma (HCC) varies in different geographical areas, being higher in regions where hepatitis virus infection and dietary exposure to aflatoxin B1 are the most common aetiological agents. These mutations are less frequently encountered in Europe, although some studies have reported p53 protein overexpression in up to 45% of cases analysed. We have analysed 129 tumour samples of primary malignant hepatic neoplasms recovered from paraffin blocks processed in two pathology laboratories in a Mediterranean area of Spain (Valencia and Gerona). Among 14 cases in which p53 immunohistochemistry expression proved positive, 5 stained in…

Genetic disorders of connective tissues

1991

Due to the growing knowledge of structure and function of extracellular matrix proteins, congenital abnormalities of connective tissues are identified or suspected in an increasing number of clinical disorders. In osteogenesis imperfecta and two subtypes of Ehlers-Danlos syndrome, the affected matrix proteins were identified and mutations in the corresponding genes (procollagen type I and type III, respectively) could be demonstrated. Some forms of chondrodysplasia were shown to be associated with mutations in the gene encoding for the cartilage-specific collagen (type II). In part, the clinical phenotype is determined by the tissue-specific distribution of these collagens. However, the cor…

Presenilin-1 Mutations Are a Cause of Primary Lateral Sclerosis-Like Syndrome

2021

6 páginas, 2 figuras

T2 mapping of the peritumoral infiltration zone of glioblastoma and anaplastic astrocytoma.

2021

Purpose To characterise peritumoral zones in glioblastoma and anaplastic astrocytoma evaluating T2 values using T2 mapping sequences. Materials and methods In this study, 41 patients with histopathologically confirmed World Health Organization high grade gliomas and preoperative magnetic resonance imaging examinations were retrospectively identified and enrolled. High grade gliomas were differentiated: (a) by grade, glioblastoma versus anaplastic astrocytoma; and (b) by isocitrate dehydrogenase mutational state, mutated versus wildtype. T2 map relaxation times were assessed from the tumour centre to peritumoral zones by means of a region of interest and calculated pixelwise by using a fit m…

Clinical spectrum of BICD2 mutations.

2020

Background and purpose Mutations in the BICD2 gene cause autosomal dominant lower extremity-predominant spinal muscular atrophy 2A (SMALED2A), a condition that is associated with a specific pattern of thigh and calf muscle involvement when studied by magnetic resonance imaging (MRI). Patients may present minor clinical sensory impairment, but objective sensory involvement has yet to be demonstrated. Methods We collected clinical data from 11 patients from five different families carrying mutations in BICD2. Genetic diagnosis was achieved using gene panel testing and skin biopsies were taken from two patients to study the epidermal nerve fiber density. Results In the studied patients, three …

Familial Left Ventricular Noncompaction Associated With a Novel Mutation in the Alpha-cardiac Actin Gene

2014

Primary desminopathies.

2007

•  Introduction •  Desmin is an essential component of the extrasarcomeric cytoskeleton in striated muscle cells •  Distal myopathy,cardiac arrhythmias,cardiomyopathy:classical criteria of primary desminopathies •  Sub-sarcolemmal and cytoplasmic desmin-positive protein aggregates:the morphological hallmark of primary and secondary desminopathies •  The spectrum of pathogenic desmin gene mutations •  The molecular pathogenesis of primary desminopathies: some answers gained,but even more questions raised •  Diagnostic work-up to distinguish primary from secondary desminopathies •  Treatment and clinical management of primary desminopathy patients Abstract Mutations of the human desmin gene o…

Severe Tongue Swellings In Hereditary Angioedema With A Specific Mutation In The Plasminogen Gene

2018

Acquired IFNγ resistance impairs anti-tumor immunity and gives rise to T-cell-resistant melanoma lesions

2016

Melanoma treatment has been revolutionized by antibody-based immunotherapies. IFNγ secretion by CD8+ T cells is critical for therapy efficacy having anti-proliferative and pro-apoptotic effects on tumour cells. Our study demonstrates a genetic evolution of IFNγ resistance in different melanoma patient models. Chromosomal alterations and subsequent inactivating mutations in genes of the IFNγ signalling cascade, most often JAK1 or JAK2, protect melanoma cells from anti-tumour IFNγ activity. JAK1/2 mutants further evolve into T-cell-resistant HLA class I-negative lesions with genes involved in antigen presentation silenced and no longer inducible by IFNγ. Allelic JAK1/2 losses predisposing to …

Late infantile neuronal ceroid lipofuscinosis: Quantitative description of the clinical course in patients withCLN2 mutations

2002

We examined 26 individuals with clinical and electron microscopic signs of late infantile neuronal ceroid lipofuscinosis (LINCL). In 22 cases, we found both pathogenic alleles. Sixteen patients exclusively carried either one or a combination of the two common mutations R208X and IVS5-1G > C. In the remaining cases, four missense mutations could be detected, of which R127Q, N286S, and T353P represent novel, previously not described alleles. A clinical performance score was developed by rating motor, visual, and verbal functions and the incidence of cerebral seizures in 3-month intervals during the course of the disease. A Total Disability Score was derived by summing up the single scores for…