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

A male infant is described with dysmorphology of the head and face, neck, extremities and genitalia, as well as growth and mental retardation and with the de novo interstitial deletion of the proximal segment of the long arm of chromosome 1-del (1) (q22-q25). Comparison of the phenotypic characteristics of this patient with those of previously described patients with similar deletion confirms the existence of the proximal 1q deletion syndrome.
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PMID:[Del(1)(q22-q25) syndrome. Cytogenetics and phenotype]. 361 17

We describe a 4-year-old boy with an accessory right thumb, short and broad toes, cryptorchidism, micrognathia, abnormally modeled ears, and delayed speech development. The chromosome analysis of patient's peripheral blood lymphocytes by conventional GTG banding demonstrated a small deletion in the long arm of chromosome 1. Confirmation and defined localization of the deleted segment to chromosomal bands 1q25.3-q31.3 was obtained by high resolution prometaphase analysis. Molecular studies, using a set of polymorphic chromosome 1q specific microsatellite markers, localized the deletion between the markers D1S2127 and D1S1727 on the paternally inherited chromosome 1. The maximum physical distance between these markers is approximately 21 Mb. The previously described two patients with 1q25-q31 deletions both had severe clinical manifestations, just as the other 10 patients with the proposed "intermediate 1q deletion syndrome," associated with 1q25-q32 deletions. Distinct from all these patients, the clinical picture of our patient is markedly milder, i.e., without growth retardation, microcephaly, or clear mental retardation.
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PMID:Interstitial 1q25.3-q31.3 deletion in a boy with mild manifestations. 1460 52

While there is an abundance of literature describing the association of chromosome aberrations with epilepsy, only a few refer to the detailed features of epilepsy. It is important to investigate the associations between specific chromosome abnormalities and features of epilepsy to identify genes involved in epilepsy and treat them more effectively. We investigated the correlation between specific chromosome aberrations and epilepsy by sending questionnaires to the members of Kyoto Multi-institutional Study Group of Pediatric Neurology. Seventy-six patients were collected from 10 institutions. Chromosome abnormalities included: Down syndrome (n = 19); Angelman syndrome (n = 8); Prader-Willi syndrome (n = 4); 4p- syndrome (n = 3); 1q- syndrome (n = 2); 5p- syndrome (n = 2); Miller-Dieker syndrome (n = 2); 18q- syndrome; (n = 2); Klinefelter syndrome; (n = 2); and 32 other individual chromosomal aberrations. Overall, the severity of mental retardation correlated with the severity of epilepsy. We could abstract characteristic features of epilepsy in some syndromes. In Angelman and Prader-Willi syndromes, febrile seizures occurred frequently, the onset of epilepsy was in early childhood and seizure phenotype was multiple. Paroxysmal discharge of the occipital region and diffuse high voltage slow wave on electroencephalography were characteristic in Angelman syndrome. In Down syndrome, West syndrome and focal epilepsy were common and the prognosis of epilepsy in West syndrome with Down syndrome was good. In 4p- syndrome, febrile seizures were often seen, and unilateral or generalized clonic or tonic-clonic status epilepticus were characteristic. For the other chromosomal aberrations investigated here, the patient numbers were too small to abstract common features of epilepsy.
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PMID:Multi-institutional study on the correlation between chromosomal abnormalities and epilepsy. 1566 53

A syndrome due to deletion of distal long arm of 1q was delineated by several groups. Up to now different terminal deletions 1q are described often clinically resulting in diagnosed mental retardation syndromes. We report on a 7-year-old male with distal monosomy 1q and additional genetic material on the short arm of chromosome 18. As expected, cytogenetic studies of the infant and his mother showed that the altered regions result from an unbalanced translocation of part of the long arm of chromosome 1. Comparison of our patient's data with those previously reported reveals neurological similarities but an unique genotype-phenotype correlation. The importance of a following better molecular characterization through array comparative genomic hybridization and especially the DNA sequence analysis around its breakpoints are discussed.
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PMID:A rare unbalanced translocation 1;18 in a child with epilepsy, mild dysmorphology and mental retardation. 2255 32