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© 1995 Oxford University Press

OTHER

Single cell analysis demonstrating somatic mosaicism involving 11p in a patient with paternal isodisomy and Beckwith—Wiedemann syndrome

Farideh Z. Bischoff, Gerald L. Feldman1, Christopher McCaskill, Stephanie Subramanian, Mark R. Hughes and Lisa G. Shaffer*

Department of Molecular and Human Genetics, Baylor College of Medicine Houston, TX 77030, USA 1Medical Genetics and Birth Defects Center, Henry Ford Hospital Detroit, MI 48202, USA

*To whom correspondence should be addressed

Received August 10, 1994; Revised December 12, 1994; Accepted December 12, 1994

Partial isodisomy of 11p has been observed in some patients with Beckwith—Wiedemann syndrome. In this study, we demonstrate somatic mosaicism directly through PCR and single cell analysis on blood lymphocytes from a patient with Beckwith—Wiedemann syndrome. Whole genome amplification was per formed on single cells and the resultant product was subjected to locus specific microsatellite marker analysis using PCR. Two populations of cells were detected, a population of cells with normal biparental inheritance for chromosome 11 and a population of cells with partial paternal isodisomy of 11p between markers D11S922 (11p15.5) and D11S904 (11p14–p13). These results are consistent with somatic recombination resulting in mosaicism for paternal isodisomy. The use of single cell PCR is ideal for studying the distribution of mosaicism within and between tissues and has been used in this study to identify a cell line with uniparental disomy in a patient with Beckwith—Wiedemann syndrome.


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