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Query: UMLS:C0025362 (mental retardation)
 15,878 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We report on an Arabic sibship originating from Morocco in which four children manifest an undiagnosed sublethal multiple congenital anomaly/mental retardation (MCA/MR) syndrome of intrauterine growth retardation (IUGR), microcephaly, large soft pinnae, telecanthus or true hypertelorism with squint, flat face, unusual hooked nose, very narrow mouth, retrognathia, and extremely severe neurologic impairment. One child was stillborn. Three others died in a cachectic state during their second year. One child had a severe cerebral malformation compatible with semilobar holoprosencephaly. Other inconstant manifestations are anterior chamber cleavage defect, preaxial polydactyly of feet, interventricular septal defect, and atresia of the external auditory meatus. Autosomal recessive inheritance is likely.
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PMID:Lambotte syndrome: microcephaly, holoprosencephaly, intrauterine growth retardation, facial anomalies, and early lethality--a new sublethal multiple congenital anomaly/mental retardation syndrome in four sibs. 224 28

The authors report on a child in which the occurrence of cardiac defect, urinary tract anomaly, and Duane anomaly was associated with mental retardation. The parents were first cousins. The index case was a 3-year-old girl referred for mental retardation. Auricular septal defect was diagnosed at birth. She was surgically treated for bilateral vesico-ureteral reflux at 2 years of age. At examination, she had a mild facial dysmorphism, microcephaly, spastic paraplegia and Duane anomaly. The Duane anomaly may occur in association with various partly overlapping syndromes that may be part of the same clinical spectrum, as the cervico-oculo-acoustic syndrome, the cat eye syndrome and syndromes inherited in an autosomal dominant fashion: the acro-reno-ocular syndrome and the Okihiro syndrome. Their patient seems to have a different condition from all of these previously reported syndromes associated with the Duane anomaly. Their suggest that this condition is best described as a new syndrome.
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PMID:Association of Duane anomaly with mental retardation, cardiac and urinary tract abnormalities: a new autosomal recessive condition? 771 Feb 57

We report the clinical findings in 5 patients with a terminal deletion of the short arm of chromosome 8. Mild developmental delay was constantly present, in association with microcephaly in 4 of 5 patients. Facial anomalies were mild or absent. A congenital heart defect was present in 3 patients: an atrioventricular septal defect (AVSD) in 2 and an atrial septal defect type II (ASDII) with pulmonary stenosis in one. A highly similar pattern of behavioural difficulties was present in the 3 older children (8-11 years), with outbursts of aggressiveness and destructive behaviour. Follow-up in one patient showed that at the age of 16 years, these behavioural problems had largely disappeared. This observation suggests that in addition to mental retardation, microcephaly, congenital heart defect (typically AVSD), a terminal deletion of chromosome 8p may be associated with a characteristic behavioural phenotype during childhood.
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PMID:A recognisable behavioural phenotype associated with terminal deletions of the short arm of chromosome 8. 934 3

Mental retardation and hypotonia are found in virtually all Down syndrome (DS) individuals, whereas congenital heart defects (CHDs) are only present in a subset of cases. Although there have been numerous reports of the frequency of CHDs in DS, few of the studies have had complete ascertainment of DS in a defined geographic area. The Atlanta Down Syndrome Project, a population-based study of infants born with trisomy 21, provides such a resource. In the first 6.5 years of the study, 243 trisomy 21 livebirths were identified in the five-county Atlanta area (birth prevalence: 9.6/10,000). Cardiac diagnoses were available on 227 (93%) of the cases and 89% of these evaluations were made by echocardiography, cardiac catheterization, surgery, or autopsy. Of the 227 DS infants, 44% had CHDs including 45% atrioventricular septal defect (with or without other CHDs), 35% ventricular septal defect (with or without other CHDs), 8% isolated secundum atrial septal defect, 7%, isolated persistent patent ductus arteriosus, 4% isolated tetralogy of Fallot, and 1% other. This report is unique in that it contains the largest number of trisomy 21 infants ascertained in a population-based study where modern techniques for diagnosing cardiac abnormalities predominate.
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PMID:Population-based study of congenital heart defects in Down syndrome. 1053 36

Smith-Lemli-Opitz syndrome (SLOS), an autosomal recessive condition with multiple malformations, mental retardation, and growth failure, results from markedly reduced activity of the final enzyme in the cholesterol biosynthetic pathway, 7-dehydrocholesterol Delta(7)-reductase (DHCR7). We diagnosed SLOS in a fetus following intrauterine demise at 32 weeks' gestation. Chorionic villus (CV) sampling had been performed at 30 weeks because oligohydramnios and atrioventricular septal defect were noted on fetal ultrasound. On fetal post-mortem examination, a midline U-shaped soft palate cleft, micrognathia, postaxial polydactyly of the fingers with single transverse palmar creases bilaterally, and cutaneous syndactyly of toes two-three bilaterally suggested SLOS. We hypothesized that SLOS could be confirmed by analysis of tissue sterols despite extensive autolysis, and by measurement of enzyme activity in CV cells. Measurement of DHCR7 activity in CV cells was undertaken using ergosterol as a substrate. CV cells were unable to convert any ergosterol to brassicasterol after a 72 h incubation period while control CV cells reduced 12.6-71.8% of ergosterol to brassciasterol in a 72 h period. SLOS was confirmed by measurement of elevated 7-dehydrocholesterol (7-DHC) in the CV cells. Measurements of sterols were made in multiple fetal tissues. All tissues analysed showed elevated 7-DHC with markedly increased 7-DHC/cholesterol ratios.
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PMID:Fetal demise with Smith-Lemli-Opitz syndrome confirmed by tissue sterol analysis and the absence of measurable 7-dehydrocholesterol Delta(7)-reductase activity in chorionic villi. 1071 29

Distal deletion of chromosome 3p25-pter (3p- syndrome) produces a distinct clinical syndrome characterised by low birth weight, mental retardation, telecanthus, ptosis, and micrognathia. Congenital heart disease (CHD), typically atrioventricular septal defect (AVSD), occurs in about a third of patients. In total, approximately 25 cases of 3p- syndrome have been reported world wide. We previously analysed five cases and showed that (1) the 3p25-pter deletions were variable and (2) the presence of CHD correlated with the proximal extent of the deletion, mapping a CHD gene centromeric to D3S18. To define the molecular pathology of the 3p- syndrome further, we have now proceeded to analyse the deletion region in a total of 10 patients (five with CHD), using a combination of FISH analysis and polymorphic markers, for up to 21 loci from 3p25-p26. These additional investigations further supported the location of an AVSD locus within 3p25 and refined its localisation. Thus, the critical region was reduced to an interval between D3S1263 and D3S3594. Candidate 3p25 CHD genes, such as PMCA2 (ATP2B2), fibulin 2, TIMP4, and Sec13R, were shown to map outside the target interval. Additionally, the critical region for the phenotypic features of the 3p- phenotype was mapped to D3S1317 to D3S17 (19-21 cM). These findings will accelerate the identification of the 3p25 CHD susceptibility locus and facilitate investigations of the role of this locus in non-syndromic AVSDs, which are a common form of familial and isolated CHD.
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PMID:Detailed mapping of a congenital heart disease gene in chromosome 3p25. 1092 84

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

Wolf-Hirschhorn syndrome (WHS) is a rare developmental disorder associated with hemizygous deletion of short arm of chromosome 4. Main phenotype characteristics of WHS are: intrauterine growth retardation, mental retardation, typical facial dysmorphism ("Greek warrior helmet"), microcephaly and midline fusion defects (cleft lip or palate, cardiac septal defects). Other abnormalities, like agenesis of corpus callosum, dysplastic kidneys, coloboma iris, skeletal abnormalities have been described occasionally. We described female newborn baby with 4p deletion, who had most of the phenotype characteristics of Wolf-Hirschhorn syndrome: intrauterine growth retardation, microcephaly, facial dysmorphism, congenital hypotonia and seizures in neonatal period. Other abnormalities included: hypoplastic cervical vertebra C4-C5, renal cyst and partial agenesis of corpus callosum. Patient had not cardiac septal defect. Due to a broad spectrum of possible morphologic abnormalities followed by mental retardation, prenatal diagnosis is very important. Postnatal recognition of the syndrome requires genetic counseling of parents and supportive multidisciplinary treatment.
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PMID:[Wolf-Hirschhorn syndrome]. 1562 61

During a 39-month period, we prospectively studied the noncardiac defects (NCD) in 320 Saudi children who presented to us with congenital heart disease (CHD). Ninety NCD were detected in 80 (25%) of the 320 patients. Recognized syndromes comprised 49 (54%) of the 90 NCD; Down syndrome alone accounted for 32 (65%) of the 49 syndromal defects. Next to syndromal defects were musculoskeletal (24.5%), neurological (9%) and gastrointestinal defects (8%). As expected, there was an association between Down syndrome and cardiac septal defects: 28 (87.5%) of the 32 patients with this syndrome had some form of septal defect, and 16 of the 17 cases of atrioventricular (AV) canal defect occurred in patients with trisomy-21. Overall, the NCD were considered to be moderately severe or severe in 67 (84%) of the 80 affected patients. Indeed, 48 (60%) of the 80 patients (or 15% of the original group of 320 patients) had varying degrees of mental retardation. The results of this study confirm the well-recognized association between trisomy-21 and cardiac malformation, and emphasize the need to search for such defects in any child with Down phenotype, and suggest that there is a relatively high incidence of serious NCD in children with congenital heart disease. Nationwide studies on birth defects are needed, and if they yield data similar to those from our present study, appropriate prevention strategies will have to be considered.
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PMID:Noncardiac defects in children with congenital heart disease. 1758 88

Distal deletion of chromosome 3p25-pter (3p- syndrome) produces a distinct clinical syndrome characterized by low birth weight, mental retardation, telecanthus, ptosis, and micrognathia. Congenital heart disease (CHD), typically atrioventricular septal defect (AVSD) occurs in about a third of patients. Previously we reported on an association between the presence of CHD and the proximal extent of the deletion such that a CHD susceptibility gene was mapped between D3S1263 and D3S3594. In addition, we and others have suggested several candidate genes for the psychomotor retardation usually seen with constitutional 3p25 deletions. In order to further investigate genotype-phenotype correlations in 3p- syndrome we analyzed 14 patients with cytogenetically detectable deletions of 3p25 (including one patient with a normal phenotype) using Affymetrix 250K SNP microarrays. Deletion size varied from approximately 6 to 12 Mb. Assuming complete penetrance, a candidate critical region for a CHD susceptibility gene was refined to approximately 200 kb and a candidate critical region for mental retardation was mapped to an approximately 1 Mb interval containing SRGAP3 but other 3p neurodevelopmental genes including CHL1, CNTN4, LRRN1, and ITPR1 mapped outside the candidate critical interval. We suggest that current evidence suggests that SRGAP3 is the major determinant of mental retardation in distal 3p deletions.
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PMID:Microarray based analysis of 3p25-p26 deletions (3p- syndrome). 1976 Jun 23


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