An accessory marker derived from chromosome 20 and its co-existence with a mosaic trisomy 20 cell line |
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Authors: | Denise A S Batista PhD Cathleen Escallon Karin J Blakemore Gail Stetten |
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Institution: | Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD, U.S.A. |
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Abstract: | We report a 16-month-old boy with delayed psychomotor development, dysmorphic features, and failure to thrive. He had a mosaic karyotype detected prenatally: mos 46,XY/47,XY,+r(20)/47,XY,+20. After birth, the abnormal cell lines were confirmed in a number of tissues. The small ring chromosome was identified using fluorescence in situ hybridization as derived from chromosome 20. We compared our patient with previously reported cases of mosaic trisomy 20 detected prenatally and associated with an abnormal phenotype. In an attempt to characterize an r(20) syndrome, we also compared our case with two similar reports in the literature. |
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Keywords: | Trisomy 20 mosaicism ring chromosome 20 marker chromosome |
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