Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0025362 (mental retardation)
 15,878 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Bardet-Biedl syndrome (BBS) is a genetic disorder with the primary features of obesity, pigmentary retinopathy, polydactyly, renal malformations, mental retardation, and hypogenitalism. Patients with BBS are also at increased risk for diabetes mellitus, hypertension, and congenital heart disease. BBS is known to map to at least six loci: 11q13 (BBS1), 16q21 (BBS2), 3p13-p12 (BBS3), 15q22.3-q23 (BBS4), 2q31 (BBS5), and 20p12 (BBS6). Although these loci were all mapped on the basis of an autosomal recessive mode of inheritance, it has recently been suggested-on the basis of mutation analysis of the identified BBS2, BBS4, and BBS6 genes-that BBS displays a complex mode of inheritance in which, in some families, three mutations at two loci are necessary to manifest the disease phenotype. We recently identified BBS1, the gene most commonly involved in Bardet-Biedl syndrome. The identification of this gene allows for further evaluation of complex inheritance. In the present study we evaluate the involvement of the BBS1 gene in a cohort of 129 probands with BBS and report 10 novel BBS1 mutations. We demonstrate that a common BBS1 missense mutation accounts for approximately 80% of all BBS1 mutations and is found on a similar genetic background across populations. We show that the BBS1 gene is highly conserved between mice and humans. Finally, we demonstrate that BBS1 is inherited in an autosomal recessive manner and is rarely, if ever, involved in complex inheritance.
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PMID:Evaluation of complex inheritance involving the most common Bardet-Biedl syndrome locus (BBS1). 1252 98

Tuberous sclerosis (TS) is a genetic disorder affecting multiple body systems, and resulting from alterations in cell differentiation and proliferation. The disease is characterized by the development of benign hamartomatous tumors: neurofibromas and angiofibromas, located in the skin, central nervous system, mucosas and other organs. Abnormal neural cell migration plays an important role in the neurological dysfunctions found in TS, the predominant features being mental retardation, seizures and behavioral disorders. The condition is produced by mutations in genes TSC1 of chromosome 9q34 and TSC2 of chromosome 16p13.3, and exhibits a dominant autosomal hereditary trait--though 60-70% of cases are sporadic and represent new mutations. The phenotype is highly variable. The prevalence of TS varies between 1/6000 and 1/10,000 live births. The present study reports the case of a 21-year-old male with TS and oral manifestations of the disease. The clinical characteristics are described, along with the diagnostic criteria and the management strategies, with a review of the literature on the disease.
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PMID:Tuberous sclerosis: presentation of a clinical case with oral manifestations. 1261 72

Down syndrome (DS) is the most significant genetic disorder with mental retardation and is caused by trisomy 21. The phenotype of DS is thought to result from overexpression of a gene(s) located on the triplicated chromosome (region). An increasing body of evidence that challenge this "gene dosage effect" hypothesis, however, has been reported indicating that this hypothesis still remains to be elucidated. The availability of the complete sequence of genes on chromosome 21 could have an immediate impact on DS research, but no conclusions can be drawn from nucleic acid levels. This made us evaluate protein levels of six proteins, gene products, encoded on chromosome 21 (T-cell lymphoma invasion and metastasis inducing Tiam1 protein, holocarboxylase synthetase, human interferon-regulated resistance GTP-binding protein MxA, Pbx regulating protein 1, autoimmune regulator, and pericentrin) in fetal cortex from DS and controls at 18-19 weeks of gestational age using Western blot technique. None of the investigated proteins showed overexpression in DS compared to controls. Our present data showing unaltered expression of six proteins on chromosome 21 in fetal DS brain suggest that the existence of the trisomic state is not involved in abnormal development of fetal DS brain and that the gene dosage effect hypothesis is not sufficient to fully explain the DS phenotype. We are in the process of quantifying all gene products of chromosome 21 and our first results do not support the gene dosage hypothesis.
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PMID:Protein levels of genes encoded on chromosome 21 in fetal Down syndrome brain: challenging the gene dosage effect hypothesis (Part I). 1262 42

Down syndrome (DS) is the most frequent genetic disorder with mental retardation and caused by trisomy 21. Although the gene dosage effect hypothesis has been proposed to explain the impact of extra chromosome 21 on the pathology of DS, a series of evidence that challenge this hypothesis has been reported. The availability of the complete sequences of genes on chromosome 21 serves now as starting point to find functional information of the gene products, but information on gene products is limited so far. We therefore evaluated expression levels of six proteins whose genes are encoded on chromosome 21 (synaptojanin-1, chromosome 21 open reading frame 2, oligomycin sensitivity confering protein, peptide 19, cystatin B and adenosine deaminase RNA-specific 2) in fetal cerebral cortex from DS and controls at 18-19 weeks of gestational age using Western blot analysis. Synaptojanin-1 and C21orf2 were increased in DS, but others were comparable between DS and controls, suggesting that the DS phenotype cannot be simply explained by gene dosage effects. We are systematically quantifying all proteins whose genes are encoded on chromosome 21 in order to provide a better understanding of the pathobiochemistry of DS at the protein level. These studies are of significance as they show for the first time protein levels that are carrying out specific function in human fetal brain with DS.
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PMID:Protein levels of genes encoded on chromosome 21 in fetal Down syndrome brain: challenging the gene dosage effect hypothesis (Part III). 1262 44

Williams syndrome is a genetic disorder associated with characteristic facies, supravalvar aortic stenosis, peripheral pulmonary stenosis, mental retardation, hypertension, premature aging of skin, and congenital cardiac defects. Many cardiac defects such as bicuspid aortic valve, mitral valve regurgitation, coarctation of the aorta, and ventricular or atrial septal defects are linked to the syndrome. Complete atrioventricular septal defect has rarely been associated with Williams syndrome and only one necropsy case has been reported in the literature. The long term follow up of Williams syndrome associated with complete atrioventricular septal defect is reported. During a 10 year follow up period, the pressure gradient in the ascending aorta did not increase despite narrowing of the ascending aorta as identified on an aortogram.
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PMID:Williams syndrome associated with complete atrioventricular septal defect. 1269 80

Down syndrome (DS) is the most frequent genetic disorder with mental retardation and caused by trisomy 21. Although the molecular mechanisms of the various phenotypes of DS could be due to overexpression of gene(s) on chromosome 21, several groups have challenged this gene dosage effect hypothesis. The near completion of the sequencing of human chromosome 21 provides unprecedented opportunities to understand the molecular pathology of DS, however, functional information on gene products is limited so far. We therefore evaluated the levels of six proteins whose genes are encoded on chromosome 21 (trefoil factor 1, trefoil factor 2, trefoil factor 3, coxsackie virus and adenovirus receptor, carbonyl reductase 1 and interferon- alpha receptor) in fetal cerebral cortex from DS and controls at the early second trimester using Western blot analysis. None of the investigated proteins showed overexpression in DS compared to controls suggesting that these proteins are not involved in abnormal development of fetal DS brain and that DS phenotype can not be simply explained by the gene dosage effect hypothesis. We are systematically quantifying all proteins whose genes are encoded on chromosome 21 and these studies may provide a better understanding of genotype-phenotype correlation in DS.
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PMID:Protein levels of genes encoded on chromosome 21 in fetal Down syndrome brain: Challenging the gene dosage effect hypothesis (Part IV). 1283 57

Cohen syndrome is a rare genetic disorder consisting of truncal obesity, hypotonia, mental retardation, characteristic facial appearance and ocular anomalies. Other diagnostic clinical features include narrow hands and feet, low growth parameters, neutropenia and chorioretinal dystrophy. Here, we report an 18-year-old male with Cohen syndrome associated with focal polymicrogyria and continuous spike-and-wave discharges during slow-wave sleep.
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PMID:Focal polymicrogyria, continuous spike-and-wave discharges during slow-wave sleep and Cohen syndrome: a case report. 1290 81

Down's syndrome is a genetic disorder that can lead to mental retardation of varying degrees. How this chromosomal abnormality causes mental retardation remains an open question. This paper reviews what is currently known about the neural and cognitive features of Down's syndrome, noting the growing evidence of disproportionate impairment of specific systems such as the hippocampal formation, the prefrontal cortex and the cerebellum. The development of animal models of these defects offers a way of ultimately connecting the genetic disorder to its cognitive consequences.
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PMID:Down's syndrome: a genetic disorder in biobehavioral perspective. 1293 89

Down syndrome (DS) is the most common genetic disorder with mental retardation and a host of deranged proteins has already been described. Protein hunting leads to rapid accumulation of aberrant proteins and proteomics methods not only allow unambiguous identification of proteins, they are also a powerful tools to identify new or predicted proteins. We applied two-dimensional gel electrophoresis with in-gel digestion of proteins and subsequent MALDI-TOF mass-spectrometrical identification and quantification of spots using specific software on cortical brain samples from 7 controls and 7 samples from fetal DS at the early second trimester. Nine hypothetical proteins were identified: three of them (4833418L03Rik protein Q9D614, mitochondrial inner membrane protein Q16891 and Nit protein 2 Q8WUF0) were significantly and about doublefold reduced in fetal DS brain. Hypothetical proteins CGI 99, FLJ10463, 70 kDa WD-repeat tumor rejection antigen homolog, KSRP, Hypothetical protein 49.6 kDa and Elongin A were comparable between groups. Domain analysis of deranged structures revealed a t_SNARE domain for the Rik protein, indicating involvement of this protein in the exocytotic-synaptic machinery impaired in DS, a CN hydrolase domain for Nit protein 2, possibly reflecting aberrant nitrilase-related metabolism and handling and an inner mitochondrial protein, extending knowledge on the mitochondrial deficit in in fetal DS early in life.
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PMID:Deranged hypothetical proteins Rik protein, Nit protein 2 and mitochondrial inner membrane protein, Mitofilin, in fetal Down syndrome brain. 1452 10

Prader-Willi syndrome (PWS) is a complex genetic disorder. It is characterized by hypotonia, short stature, hypogonadism, mental retardation, behavioral problems, and hyperphagia, which result in excessive obesity (Lindgren et al., 2000). The abnormal body composition resembles children seen with growth hormone deficiency (Carrel & Allen, 2001) . The dysmorphic features characteristic of PWS include a narrow forehead, a broad nasal bridge, slightly up slanting almond-shaped palpebral fissures, a down turned mouth with a thin upper lip, and narrow hands and feet (Martin et al., 1998). Management of children with PWS requires an ongoing multidisciplinary approach. The delivery of care includes assistance from geneticists, nutritionists, internists, endocrinologists, physical therapists, and psychologists to meet the medical, developmental, behavioral, and social needs. The focus of the nurse practitioner should include assisting the family in the management of these complex patients throughout their childhood.
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PMID:Anticipatory guidance for parents of Prader-Willi children. 1474 37


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