Tetrasomy 5p mosaicism in a boy with delayed growth, hypotonia, minor anomalies, and an additional isochromosome 5p [46,XY/47,XY, + i(5p)].
Am J Med Genet
; 47(4): 559-62, 1993 Sep 15.
Article
em En
| MEDLINE
| ID: mdl-7504882
ABSTRACT
We describe a 1-year-old boy with a rare de novo 46,XY/47,XY, + i(5p) mosaicism (ratios 28/3 in peripheral blood lymphocytes and 2/12 in skin fibroblasts). The boy, born after a pregnancy of 34 weeks, had lung hypoplasia, persistent hypotonia, and postnatal growth failure. Craniofacial anomalies were also present. His clinical manifestations correspond to those described in trisomy 5p patients. Prenatal diagnosis on maternal age indication had shown normal male chromosomes in 16 cells in the short term culture of a chorionic villus sampling. Retrospectively, 1 out of 217 cells in this culture showed the i(5p). Several mechanisms could have resulted in the formation of this 46/47, + i(5p) mosaic. Postzygotic local incorrect ligation during chromatid replication, followed by a second replication offers an attractive model on theoretical grounds since it needs only one step to explain both isochromosome formation and mosaicism. Differences between the various tissues in selection pressure on cells with the isochromosome might explain the different ratios of mosaicism found.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cromossomos Humanos Par 5
/
Deficiências do Desenvolvimento
/
Aberrações Cromossômicas
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Aneuploidia
/
Mosaicismo
Tipo de estudo:
Prognostic_studies
Limite:
Humans
/
Male
/
Newborn
Idioma:
En
Revista:
Am J Med Genet
Ano de publicação:
1993
Tipo de documento:
Article
País de afiliação:
Holanda