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Results for “Genetic predisposition”

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PubMed1994

[Criteria of genetic predisposition to hereditary non polyposis colorectal cancers].

Clinical and histological characteristics of non polypoid colorectal cancers with an hereditary predisposition are presented. The various known genetic syndromes (hereditary non polyposis colorectal cancers, Lynch syndrome type I and type II, Torre-Muir's syndrome, hereditary flat adenoma syndrome) are discussed to find a possible correlation between this nosological classification and their molecular substratum. The main problem today, is to correctly define the population of hereditary predisposed patients to colon cancer, in order to seek and identify the major responsible gene. Any physician, specialist or not, should be encouraged to give the details of the cancer familial context of his patients, in order to aid the oncologist geneticist in his task.

Adult↗
PubMedDate not supplied

[Genetic predisposition to breast cancer: a review in April 1998].

The recent identification of the BRCA1 and BRCA2 genes allows to understand in an increasing number of cases the origin of a breast/ovarian cancer family history and thereby to propose genetic testing to at risk women. However to know to be carrier of a predisposing germline mutation is at the present to deal with the difficult choice of different supportive cares: close follow up or prophylactic surgery. Numerous studies still have to be done to determine the better management of women at risk. The other challenges are the understanding of the origin of each breast or ovarian cancer case; to identify the factors which modify the tumor risks in predisposed women; and finally to win the social acceptance of genetic testing avoiding any discrimination.

BRCA1 Protein↗
PubMed2005

Genetic predisposition to latex allergy: role of interleukin 13 and interleukin 18.

BACKGROUND: Occupational exposure of healthcare workers to natural rubber latex has led to sensitization and potentially life-threatening anaphylaxis. Although environmental exposure to natural rubber latex products is necessary for sensitization, it is not sufficient. A number of genetic factors also seem to contribute to the latex sensitization; however, the multigenic nature of the allergic phenotype has made the identification of susceptibility genes difficult. The current study tests the hypothesis that known functional polymorphisms in genes encoding interleukin 4, interleukin 13, and interleukin 18 occur in a higher frequency in healthcare workers with natural rubber latex allergy. METHODS: Four hundred thirty-two healthcare workers with occupational exposure to natural rubber latex were screened using a clinical history questionnaire and latex-specific immunoglobulin E serology. Genomic DNA was extracted from peripheral blood lymphocytes and analyzed for single-nucleotide polymorphisms in candidate genes of interest. Data from cases and controls were analyzed by nominal logistic regression, with P < 0.05 considered significant. RESULTS: The latex allergy phenotype was significantly associated with promoter polymorphisms in IL13 -1055 (P = 0.02), IL18 -607 (P = 0.02), and IL18 -656 (P = 0.02) compared with nonatopic controls. CONCLUSIONS: The significant association of IL13 and IL18 promoter polymorphisms with latex allergy suggests a potential location for genetic control in the induction of latex allergy in individuals and extends the understanding of the genetic basis for the induction of immediate-type hypersensitivity in healthcare workers occupationally exposed to natural rubber latex.

Adult↗
PubMed2003

[Violent behavior in men due to genetic predisposition and childhood abuse: an hypothesis].

Caspi et al. recently reported that the likelihood of an abused child becoming violent as an adult hinges on a gene regulating the expression of monoamine oxidase A. This enzyme metabolises neurotransmitters. The scientists followed 442 boys from birth to their mid twenties and found an interaction between childhood abuse and a genetic polymorphism. Major strengths of the study are the longitudinal design and the excellent follow-up rate. Moreover, childhood abuse and antisocial behaviour are operationalised in various manners. The different forms of childhood abuse and neglect are, however, summarised and individual results are only presented for the different outcomes. In this way the consistency of the results is shown, but significance is only reached for one outcome: 'antisocial personality disorder symptoms'. It is especially important to replicate the study that investigated an association but no causal mechanism. Thus, conclusions about susceptibility to childhood abuse or medical treatment options for neglected children are premature.

Adolescent↗
PubMed2003

Genetic predisposition to neuroleptic malignant syndrome : implications for antipsychotic therapy.

The pathogenetic mechanism of neuroleptic malignant syndrome (NMS), a potentially lethal adverse effect of antipsychotics, is not well understood. In addition to acquired risk factors, clinical observations suggest a number of genetic factors predisposing patients to NMS. Recent findings in pharmacogenetics indicate that the genetic polymorphisms for drug-metabolizing enzymes, drug transporters, and possibly drug-targeting molecules, are associated with the interindividual differences in drug responses concerning both efficacy and adverse reactions. Genetic association studies have sought to identify polymorphisms influencing susceptibility to NMS, especially with respect to the dopamine D(2) receptor, serotonin receptor, and cytochrome p450 2D6. While a few candidate polymorphisms were associated with NMS, a large controlled study is needed to attain statistical power. On the other hand, NMS might include heterogeneous conditions with common characteristic symptoms but different causative mechanisms. Further analysis of individuals with identified genetic mutations or polymorphisms should advance our understanding of mechanisms underlying NMS.

Animals↗
PubMed2007

DNA repair gene polymorphisms and genetic predisposition to cutaneous melanoma.

The incidence of cutaneous melanoma is rising rapidly in a number of countries. The key environmental risk factor is exposure to the ultraviolet (UV) component in sunlight. The nucleotide excision repair (NER) pathway deals with the main forms of UV-induced DNA damage. We have investigated the hypothesis that polymorphisms in NER genes constitute genetic susceptibility factors for melanoma. However, not all melanomas arise on sun-exposed sites and so we investigated the hypothesis that genes involved in other pathways for the repair of oxidative DNA damage may also be involved in susceptibility to melanoma. Scotland, with its high incidence of melanoma and stable homogeneous population, was ideal for this case-control study, involving 596 Scottish melanoma patients and 441 population-based controls. Significant associations were found for the NER genes ERCC1 and XPF, with the strongest associations for melanoma cases aged 50 and under [ERCC1 odds ratio (OR) 1.59, P = 0.008; XPF OR 1.69, P = 0.003]. Although an XPD haplotype was associated with melanoma, it did not contain the variant 751 Gln allele, which has been associated with melanoma in some previous studies. No associations were found for the base excision repair and DNA damage response genes investigated. An association was also found for a polymorphism in the promoter of the vitamin D receptor gene, VDR (OR 1.88, P = 0.005). The products of the two NER genes, ERCC1 and XPF, where associations with melanoma were found, act together in a rate-limiting step in the repair pathway.

Case-Control Studies↗
PubMed2000

Evidence for a genetic predisposition towards acute rejection after kidney and simultaneous kidney-pancreas transplantation.

BACKGROUND: In vitro production of tumor necrosis factor-alpha (TNF-alpha), interferon-gamma (IFN-gamma), interleukin 10 (IL-10), and transforming growth factor-beta (TGF-beta) correlate with their respective genetic polymorphisms. We analyzed the relationship between these genetic polymorphisms and posttransplant outcome. METHODS: Using DNA polymerase chain reaction (PCR) technology, polymorphisms for TNF-alpha, IFN-gamma, IL-10, and TGF-beta were determined for 82 kidney (K) and 19 simultaneous kidney-pancreas (SKP) recipients. These results were analyzed with regard to the incidence of acute rejection (AR), and the timing and severity of the first AR episode. RESULTS: A high TNF-alpha production phenotype correlated with recurrent acute rejection (AR) episodes (P<0.026). Compared with the low TNF-alpha production phenotype, more patients with the high production phenotype had a post-AR serum creatinine >2.0 mg/dl, but this was not statistically significant (64 vs. 35%, P=0.12). There was no relationship between TNF-alpha genotype and the time to first AR episode or incidence of graft loss. IFN-gamma production phenotype showed no correlation with any of these clinical outcome parameters. There was an increase in AR incidence as the IL-10 production phenotype increased (low, intermediate, high), but only in low TNF-alpha producer phenotypes (P=0.023). CONCLUSIONS: Patients with a polymorphic cytokine genotype putatively encoding for high in vivo TNF-alpha production, and to a lesser extent IL-10 cytokine genotypes putatively encoding for higher levels of in vivo IL-10 production, had a worse clinical outcome regarding AR episodes. These data support the hypothesis that the strength of alloimmune responsiveness after transplantation in part is genetically determined.

Acute Disease↗
PubMed1999

[Hereditary neoplastic diseases (genetic predisposition and cancer syndromes)].

After one decade of molecular genetic studies, little doubt remains that cancer is a genetic disease. While mutations in somatic cells may cause cancer, they don't carry forward to the next generation. In fact, most cancers arise in this way. In some individuals mutations in cancer related genes may be present at the constitutional level, inherited from one of the parents. An individual who carries a mutant allele of an inherited cancer gene has a variable risk of cancer that is influenced by other genetic and non-genetic factors (such as other cellular genes, dietary, lifestyle, and environmental factors). Collectively, the syndromes affect about 1% of cancer patients. During the past decade about 25 different cancer susceptibility genes have been reported to be linked to the known hereditary cancer syndromes. Over the period of the last three to five years, studies of the specific mutations responsible for these syndromes and the cellular signaling pathways disrupted by the mutant proteins have begun to provide unprecedented insights into the molecular origin and pathogenesis of inherited and sporadic forms of cancer. This article reviews the cancer susceptibility genes and cancer syndromes, particularly those associated with common malignancies (breast, prostate and colorectal carcinomas). Results of the mutation analysis in BRCA1 and BRCA2 genes of Hungarian breast/ovarian cancer families will be briefly discussed. These data indicate a strong founder effect for some mutations of BRCA1 gene in Hungary. As a results of recent publicity of discoveries of molecular genetics--particularly those related to common malignancies--due to publicity in the scientific and the lay press awareness and demand for predictive DNA tests have dramatically increased worldwide over the past 3 years. The author, as a member of the Breast Cancer Linkage Consortium, shares the consensus view that genetic testing and genetic counseling for cancer risk together with surveillance and management should for the present be offered only through specialist clinical genetic departments as part of a research evaluation.

DNA, Neoplasm↗
PubMed1992

No evidence for involvement of type 1 collagen structural genes in 'genetic predisposition' to alcoholic cirrhosis.

Type 1 collagen is the predominant collagen in cirrhotic livers. Each type 1 collagen molecule contains three subunits, two are identical (the alpha 1 chains) and the sequence of the third (alpha 2) is very similar. They are encoded at the non-synthenic loci, COL1A1 and COL1A2 and restriction site dimorphisms have been described at each locus. Genetic factors have been invoked as a basis for increased susceptibility to alcoholic cirrhosis. One hypothesis is that genetically determined differences in type 1 collagen may be involved in this predisposition. We have examined this by analysing restriction fragment length polymorphisms at each type 1 collagen locus in leucocyte DNA from 56 unrelated patients with alcoholic cirrhosis and 74 local unrelated healthy controls. Based on the presence or absence of these restriction site dimorphisms four possible haplotypes were generated at COL1A1 and COL1A2. We found no significant difference in allele frequencies between alcoholic cirrhotics and controls and, unlike a previous small study, we found no particular haplotype of either gene was associated with alcoholic cirrhosis. Our study provides no evidence for involvement of type 1 collagen structural genes in a genetic predisposition to cirrhosis in alcoholics.

Collagen↗
PubMed1999

Variations of p53 in cultured fibroblasts of patients with lung cancer who have a presumed genetic predisposition.

The authors studied cultured skin fibroblasts of 64 patients with lung cancer for constitutive mutations of the p53 tumor suppressor gene by using polymerase chain reaction and single-strand conformation polymorphism covering the entire coding region. The patients were considered to be genetically predisposed because lung cancer had developed in 25 of them before age 46 and because 42 of them had at least one first-degree relative with lung cancer. One mutation was detected at position 235 coding for serine instead of asparagine in the conserved DNA binding domain. The Pro/Pro genotype at codon 72 of p53, considered to harbor an increased risk for lung cancer, could not be detected with increased frequency in this study's patients. From these data, the authors conclude that constitutive variations of the p53 gene do not represent a major genetic determinant for lung cancer.

Adult↗