Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0917816 (mental retardation)
 15,867 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The phenotypic effects of trisomy of various segments of chromosome 8 have been recognized through the analysis of twelve different patients: five mosaic cases of trisomy 8, one case of trisomy for the short arm and the proximal segment of the long arm, two cases of trisomy for a portion of the short arm, and four cases of trisomy for the terminal segment of the long arm. Analysis of the data from the literature and of these personal observations allows the definition of three syndromes: trisomy 8, trisomy 8p and 8q proximal, and trisomy 8q terminal. Three clinical signs are common to the three syndromes: vertebral anomalies, depression of the mesosternum, and bulging of the forehead. This suggests that different segments of chromosome 8 carry genes affecting osseous growth. Trisomy 8p causes, in addition to severe mental deficiency, a thick nose, a large mouth, and microcephaly. Other clinical signs can be assigned to three groups corresponding to the short arm, the proximal part, and the distal part of the long arm.
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PMID:[Chromosome 8 : complete trisomy and segmental trisomies]. 30 74

This report describes an infant with fatal congenital heart disease, cleft palate, brain malformations, and trisomy 8p resultant from the paternal balanced reciprocal translocation, rcp(8;15) (p11;p11). Review of six previously reported trisomy 8p patients (resultant from parental balanced translocation in each instance) revealed severe mental retardation in five, short stature in all, and a variety of brain, skeletal, and cardiac defects. The features of the seven trisomy 8p patients reviewed here are not sufficiently similar to suggest a distinct dysmorphic syndrome. In addition the features differ from those in the trisomy 8 mosaicism syndrome, in which the mental retardation and malformations are generally less severe.
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PMID:Report of a trisomy 8p infant with carrier father. 31 58

The association of mental deficiency, macroorchidism, and a fragile site on chromosome X [fra (X)(q28) is reported in a 13-year-old boy who also exhibits a peculiar facies reminescent of trisomy 8. This particular facies is considered part of the clinical syndrome associated with the fra(X)(q28). The fra(X)(q28) was not found in the mother nor in two normal sibs of the propositus. The significance of the marker is discussed in view of two hypotheses, close linkage between pathological gene(s) and the fra(X)(q28) and faulty transcription of the gene(s) beyond the tra(X)(q28).
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PMID:[Sex linked mental deficiency, unusual facies, macroorchidism and fragile site on chromosome X (author's transl)]. 31 81

The Warkany syndrome is characterized by mental retardation, relatively specific facies, absent or dysplastic patellas, joint contractures, plantar/palmar furrows, distinctively abnormal toe posture, vertebral anomalies, narrow pelvis, ureteral-renal anomalies, or other abnormalities. There is no association with advanced parental age, and birthweight and length are usually commensurate with gestational age. The chromosomal mechanisms accounting for the WS include either literal trisomy (8 (aneuploidy), usually if not always with mosaicism, or translocation leading to partial trisomy 8 (8q2). In addition, some patients with mosaic trisomy 8 may not have the Warkany syndrome.
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PMID:Trisomy 8: an international study of 70 patients. 89 Jan 9

A 16-year-old boy with trisomy 8 mosaicism is presented. Increased birth weight, delayed psychomotoric and accelerated somatic development, and mental retardation were noted; he exhibited a prominent forehead, a broad-bridged upturned nose, an everted lower lip, low set dysmorphic ears, strabismus, slender trunk, narrow pelvis, osseous and joint anomalies, clinodactyly, deep skin furrows on the soles, and agenesis of the corpus callosum. The trisomic cell line was observed throughout the follow-up examinations from the fibroblast cultures between 1962 and 1973, but has disappeared from the lymphocyte culture. The clinical picture of this case is compared with the leading clinical signs and symptoms of the 25 cases with confirmed trisomy 8 so far published. A scheme is proposed in order to keep in mind the clinical picture suggesting trisomy 8.
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PMID:Trisomy 8 mosaicism. A case report and a proposed list of the clinical features. 99 75

Trisomy 8 syndrome, with or without mosaicism, is characterized by the following clinical signs and symptoms: mental retardation, deformed skull, prominent forehad, high-arched palate, low-set and/or dysplastic ears, long and slender trunk, reduced joint mobility, and deep plantar furrows. The deep furrow or longitudinal crease of the sole may be pathognomonic for the syndrome. It should be noted that it has been seen in other rare syndromes. It is recommended that a child with mental retardation and associated multiple anomalies should be subjected to a cytogenetic study in order to define the incidence of this syndrome. Differnetial diagnosis should include: Fong's syndrome, arthrogryposis and otopalato-digital syndrome. It is interesting to note that there seem to be individuals who have had no physical abnormalities and have been identified during an evaluation for repeated abortions. The above described case of trisomy 8 mosaicism was seen and treated for many years by many different specialists without an accurate diagnosis.
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PMID:Trisomy 8 syndrome. 115 89

Case report of a 6 year old girl without clear dysmorphism or mental deficiency. Chromosome studies, performed on blood lymphocytes, showed trisomy 8 in 80 % of the cells. This case is discussed with regards to a short literature analysis.
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PMID:[Trisomy 8 in mosaicism]. 121 50

The case of a 40-year-old patient with congenital trisomy 8 and sex chromosome mosaicism is discussed. The main clinical features were: mental retardation, thick and darkly pigmented skin, prominent forehead, convergent strabismus, high arched palate, flexion contractures of the extremities, and numerous skeletal abnormalities. The patient developed severe aplastic anemia followed by an interim period of preleukemia which developed into acute leukemia. Electron microscope examination of the white blood cells at the stage of the aplastic anemia showed ultrastructural abnormalities similar to those observed in other genetic disorders with a predisposition to leukemia, as well as in leukemia.
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PMID:Aplastic anemia followed by leukemia in congenital trisomy 8 mosaicism. Ultrastructural studies of polymorphonuclear cells in peripheral blood. 124 72

At least 16 cases of inversion tandem duplications of the short arm of chromosome 8 have been reported. Structural rearrangements of chromosome 8 have made it possible to localise the gene for glutathione reductase (GSR) to 8p21.1. We report here on a 16 month old boy with mental retardation with partial trisomy 8 owing to a de novo inv dup(8)(p12----p23.1).
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PMID:Inverted tandem duplication of 8p12----p23.1 in a child with increased activity of glutathione reductase. 231 83

We report on 2 patients, less than age 5 years, and one adult patient with partial duplication 8p, due to interstitial duplication of bands 8p21.1-22. The phenotype in young and adult patients with this chromosomal unbalance syndrome is further documented. In young patients the craniofacial manifestations are very similar to trisomy 8 mosaicism. However, mental retardation is much more pronounced in 8p21-22 duplication than in trisomy 8 mosaicism. The phenotypic changes observed in adult patients are probably secondary and they are due to the great neurologic deficit with generalized spasticity and hypertonia.
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PMID:Partial duplication 8p due to interstitial duplication: inv dup(8)(p21.1----p22). Further delineation of the phenotype from birth to adulthood. 349 29


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