Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0036341 (schizophrenia)
 60,220 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The human chromosomal band 6p23 is a Giemsa-negative (light) band that may be expected to be relatively gene rich. The genes for spinocerebellar ataxia type 1 (SCA1), guanosine monophosphate reductase (GMPR), DEK involved in a subtype of acute myeloid leukemia (AML), and the folate-sensitive fragile site FRA6A, have already been mapped to 6p23. Recent linkage data have suggested evidence for a susceptibility locus for schizophrenia in the region. We have constructed a single YAC contig of approximately 100 clones spanning the entire 6p23 band from 6p22.3 to 6p24.1 and covering 7.5-8.5 Mb of DNA. The YAC contig contains 55 markers including genetically mapped STSs, physically mapped STSs, anonymous STSs, anonymous ESTs, and ESTs from the genes mapped to the region. The order of the genetically mapped STSs is consistent with their order in the contig and some of the markers not resolved on the genetic map have been resolved by the YACs. Four of the YACs from 6p23 and covering approximately 3 Mb of DNA have been used to isolate approximately 300 cosmids from a flow-sorted human chromosome 6 cosmid library, which have been organized into pockets. The proposed susceptibility locus for schizophrenia is most closely linked to D6S260, which is located within the YAC contig along with genetic markers < or = 5 cM on either side. Therefore, the presented materials are valuable reagents for characterization of the genomic region implicated in schizophrenia.
 ...
PMID:An integrated map of human chromosome 6p23. 875 Jan 94

Many human hereditary neurodegenerative diseases are caused by expanded CAG repeats, and anonymous CAG expansions have also been described in schizophrenia and bipolar disorder. We have isolated and sequenced a novel human cDNA encoding a neuronal, small conductance calcium-activated potassium channel (hSKCa3) that contains two arrays of CAG trinucleotide repeats. The second CAG repeat in hSKCa3 is highly polymorphic in control individuals, with alleles ranging in size from 12 to 28 repeats. The overall allele frequency distribution is significantly different in patients with schizophrenia compared to ethnically matched controls (Wilcoxon Rank Sum test, P=0.024), with CAG repeats longer than the modal value being over-represented in patients (Fisher Exact test, P=0.0035). A similar, non-significant, trend is seen for patients with bipolar disorder. These results provide evidence for a possible association between longer alleles in the hSKCa3 gene and both of these neuropsychiatric diseases, and emphasize the need for more extensive studies of this new gene. Small conductance calcium-activated K+ channels play a critical role in determining the firing pattern of neurons. These polyglutamine repeats may modulate hSKCa3 channel function and neuronal excitability, and thereby increase disease risk when combined with other genetic and environmental effects.
 ...
PMID:Isolation of a novel potassium channel gene hSKCa3 containing a polymorphic CAG repeat: a candidate for schizophrenia and bipolar disorder? 949 10

The aim of the present study was to produce a nation-wide quantitative description of re-admissions for schizophrenia in Denmark in the period 1979-1998. The study is based on anonymous data from the Psychiatric Central Register. All persons with a main diagnosis of schizophrenia are included. The number of re-admissions of schizophrenics has constantly increased since 1979 (approx. 65%), and the number of persons who account for these re-admissions has increased by approximately 55%. Patients who for the first time are diagnosed with schizophrenia have in the first year after the first admission an average risk of re-admission of 50%, a risk that has not decreased during the 20 years studied. The median age of re-admitted patients has increased by five years for males and is almost unchanged for females indicating a continuous need for re-admission of schizophrenic patients, also the older patients. Danish psychiatry has each year contact with approximately 50% of the persons who at least once have been diagnosed with schizophrenia since 1969 and who are still alive. Certain precautions must be taken in the interpretations of general aggregated statistics such as these.
 ...
PMID:[Readmissions for schizophrenia in Denmark 1979-1998]. 1074 Dec 27

Genetic association studies were conducted among two independent cohorts of Chinese ethnicity. The samples consisted of cases and unrelated controls, ascertained from Guangzhou, China, and Singapore. The studies were prompted by our earlier report of an association between schizophrenia and HLA DQB1 alleles (HLA DQB1*0602 and HLA DQB1*0303) in the Singapore sample. Polymorphisms of HLA DQB1 and flanking markers on chromosome 6p21.3 were investigated in the first part of the study. A significant negative association with HLA DQB1*0402 was detected in the Guangzhou sample (Odds ratio, OR 0.26, 95% confidence intervals, CI 0.1, 0.6; p < 0.02, corrected for multiple comparisons). Additional analysis of the Guangzhou and Singapore samples revealed associations at three other anonymous markers flanking HLA DQB1. In the second part of the study, three polymorphisms at the Interleukin-1 gene cluster (IL-1, chromosome 2q13-q21) were investigated in both cohorts, since associations with schizophrenia have been reported in another sample. Persuasive evidence for an association at IL-1 was not detected in either sample. Our results suggest a susceptibility locus for schizophrenia in the HLA region among the Chinese, but further clarification is necessary.
 ...
PMID:Immune related genetic polymorphisms and schizophrenia among the Chinese. 1142 78

Schizophrenia and bipolar disorder both show some evidence for genetic anticipation. In addition, significant expansion of anonymous CAG repeats throughout the genome has been detected in both of these disorders. The gene KCNN3, which codes for a small/intermediate conductance, calcium-regulated potassium channel, contains a highly polymorphic CAG-repeat array in exon 1. Initial evidence for association of both schizophrenia and bipolar disorder with increased CAG-repeat length of KCNN3 has not been consistently replicated. In the present study, we performed several meta-analyses to evaluate the pooled evidence for association with CAG-repeat length of KCNN3 derived from case-control and family-based studies of both disorders. Each group of studies was analyzed under two models, including a test for direct association with repeat length, and a test for association with dichotomized repeat-length groups. No evidence for a linear relationship between disease risk and repeat length was observed, as all pooled odds ratios approximated 1.0. Results of dichotomized allele-group analyses were more variable, especially for schizophrenia, where case-control studies found a significant association with longer repeats but family-based studies implicated shorter alleles. The results of these meta-analyses demonstrate that the risks for both schizophrenia and bipolar disorder are largely, if not entirely, independent of CAG-repeat length in exon 1 of KCNN3. This study cannot exclude the possibility that some aspect of this polymorphism, such as repeat-length disparity in heterozygotes, influences risk for these disorders. Further, it remains unknown if this polymorphism, or one in linkage disequilibrium with it, contributes to some distinct feature of the disorder, such as symptom severity or anticipation.
 ...
PMID:CAG-repeat length in exon 1 of KCNN3 does not influence risk for schizophrenia or bipolar disorder: a meta-analysis of association studies. 1289 69

Stalking in the psychiatric context describes a pathological behaviour which is characterized by repeated persecution, harassment, or menacing of or assault on a person. Because of the association between stalking and mental disorders, psychiatrists, psychologists and psychotherapists belong to particularly exposed professions. If they fall victim to stalking during their career, disruptive impacts up to posttraumatic stress disorder (PTSD) can be the consequence. A total of 117 psychiatrists, psychologists or psychotherapists in Graz participated in an anonymous interview. To register possible experiences with stalking defined behaviour, a modified version of the questionnaire of Kamleiter was used. The prevalence and severity of posttraumatic stress symptoms were determined using the Impact of Event Scale of Horowitz. The study showed an incidence of stalking of 38.5%. The rate of female stalkers (60%) was extraordinary high. Most victims (68.9%) experienced non-violent threats. Most of the offenders (41.9%) were diagnosed as suffering from schizophrenia, schizotype and delusional disorders (F2) followed by disorders of adult personality and behaviour (F6) (30.2%). Some 44.4% of the victims developed symptoms of PTSD, which were usually only slight. The analyses suggest that stalking, in the psychiatric field of activity, is a common and serious phenomenon, and that strategies for the prevention and protection of potentially affected professions have to be developed.
 ...
PMID:[The effects of stalking on psychiatrists, psychotherapists and psychologists. Prevalence of stalking and its emotional impact]. 1710 27

Forty-nine people suffering from schizophrenia performed an interactive bargaining task involving small monetary rewards, known in classical game theory as the Ultimatum Game. In this task, the subject, in the role of the Proposer, has to offer his or her (anonymous) counterpart, the Responder, a share of a given sum of money. If the Responder accepts the offer, then the sum is split accordingly between the two. Otherwise, if he or she decides to reject the offer, both receive nothing. The patients' strategic behavior in both roles was compared with that of healthy and clinical controls. It was hypothesized that cognitive deficits characterizing schizophrenia, together with difficulties in social judgment, would impair the patients' bargaining ability. We found that in general schizophrenic patients did not fully exploit their strategic power as Proposers. In contrast, as Responders, schizophrenic patients acted not significantly different from controls. Further investigation is needed to establish the links between cognitive and symptomatic mediators and strategic decision-making ability.
 ...
PMID:Ultimatum bargaining behavior of people affected by schizophrenia. 1791 86

The way schizophrenia patients perceive the world is largely mysterious. Understanding and appreciating the visual world begins with the perception of basic visual features, which is altered in this mental disorder. Yet, the roles basic visual features play in functional activities such as appreciation of art are unclear. This study examined the effects of visual feature manipulation on beauty perception of art in schizophrenia patients (n=29) and in normal controls (n=30). Three pieces of art--The Starry Night (Van Gogh), Mona Lisa (Da Vinci) and a natural landscape photograph (anonymous)--were manipulated in terms of their coloration (removal of color), spatial frequency content (low or high-frequency pass) and visual noise level (with added noise). Subjects judged the beauty of the original and visual-feature-manipulated artworks by rating each piece individually (1 to 7) and by ranking all pieces from most to least beautiful. For the three original art pieces, averaged ratings and rankings were similar in patients and controls. However, when the visual features of the original pieces were manipulated, changes in the beauty ratings were significantly smaller in patients. The reduced sensitivity to visual feature manipulations suggests that the modulation of basic visual signals, often used for vivid and dynamic expressions in art, may be under-appreciated in schizophrenia.
 ...
PMID:Can persons with schizophrenia appreciate visual art? 1870 80

This article investigates the subjective experience of stigma attached to schizophrenia-related disorders. We examine data from anthropological interviews from a community sample of 90 out-patients residing in a metropolitan area of the United States. Patients were under treatment with atypical antipsychotic medication, and their symptoms were for the most part relatively well controlled. Overall, 96% of participants reported an awareness of stigma that permeated their daily life. Based on an understanding of stigma as a product of interpersonal, reciprocal social processes, we identify 6 types of social relations and 5 identity domains in which social stigma is routinely encountered by participants. We describe the experience of stigma in each of these 11 subcategories, and suggest that taken together they constitute a framework of social and personal factors involved in the struggle to recover from psychotic illness. Among types of social relations, anonymous social interactions most commonly generated an awareness of stigma. Among identity domains, being a person who regularly takes medication was most commonly associated with an awareness of stigma. The finding that multiple forms of stigma are encountered irrespective of substantial symptomatic, functional, and subjectively perceived improvement creates a complex situation of stigma despite recovery.
 ...
PMID:Awareness of stigma among persons with schizophrenia: marking the contexts of lived experience. 1959 60

Antipsychotic medication represents the treatment of choice in psychosis according to clinical guidelines. Nevertheless, studies show that half to almost three-quarter of all patients discontinue medication with antipsychotics after some time, a fact which is traditionally ascribed to side-effects, mistrust against the clinician and poor illness insight. The present study investigated whether positive attitudes toward psychotic symptoms (ie, gain from illness) represent a further factor for medication noncompliance. An anonymous online survey was set up in order to prevent conservative response biases that likely emerge in a clinical setting. Following an iterative selection process, data from a total of 113 patients with a likely diagnosis of schizophrenia and a history of antipsychotic treatment were retained for the final analyses (80%). While side-effect profile and mistrust emerged as the most frequent reasons for drug discontinuation, 28% of the sample reported gain from illness (eg, missing voices, feeling of power) as a motive for noncompliance. At least every fourth patient reported the following reasons: stigma (31%), mistrust against the physician/therapist (31%), and rejection of medication in general (28%). Approximately every fifth patient had discontinued antipsychotic treatment because of forgetfulness. On average, patients provided 4 different explanations for noncompliance. Ambivalence toward symptoms and treatment should thoroughly be considered when planning treatment in psychosis. While antipsychotic medication represents the evidence-based cornerstone of the current treatment in schizophrenia, further research is needed on nonpharmacological interventions for noncompliant patients who are willing to undergo intervention but refuse pharmacotherapy.
 ...
PMID:Beyond the usual suspects: positive attitudes towards positive symptoms is associated with medication noncompliance in psychosis. 2233 89


1 2 Next >>