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PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2000-9-29
pubmed:abstractText
Maternal uniparental disomy (UPD) accounts for approximately 25% of Prader-Willi patients (PWS) and paternal UPD for about 2-5% of Angelman syndrome (AS) patients. These findings and the parental origin of deletions are evidence of genomic imprinting in the cause of PWS and AS. The natural occurrence of UPD individuals allows the study of meiotic mechanisms resulting in chromosomal nondisjunction (ND). We selected patients with UPD15 from our sample of 30 PWS and 40 AS patients to study the origin of ND and the recombination along chromosome 15. These patients were analyzed with 10 microsatellites throughout the entire chromosome 15 (D15S541, D15S542, D15S11, D15S113, GABRB3, CYP19, D15S117, D15S131, D15S984, D15S115). The analysis disclosed seven heterodisomic PWS cases originating by meiosis I (MI) ND (four showed recombination and three no recombination), and one isodisomic PWS UPD15 originating by postzygotic duplication. Among the five paternal UPD15, we detected four isodisomies, three of which showed homozigosity for all markers, corresponding to a mitotic error, and one case originating from a paternal MII ND. Our results indicate that besides maternal MI and MII ND, paternal ND occurs when a PWS UPD15 patient originates from mitotic duplication of the maternal chromosome 15. ND events in AS are mainly due to mitotic errors, but paternal MII ND can occur and give origin to an AS UPD15 individual by two different mechanisms: rescue of a trisomic fetus or fertilization of a nullisomic egg with the disomic sperm, and in this case paternal and maternal ND are necessary.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0148-7299
pubmed:author
pubmed:copyrightInfo
Copyright 2000 Wiley-Liss, Inc.
pubmed:issnType
Print
pubmed:day
18
pubmed:volume
94
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
249-53
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Origin of uniparental disomy 15 in patients with Prader-Willi or Angelman syndrome.
pubmed:affiliation
Department of Biology, Institute of Bioscience, University of Sâo Paulo, Sâo Paulo, Brazil. cfridman@ib.usp.br
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't