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J Hum Genet. 2003;48(6):283-7. Epub 2003 Apr 24.

Molecular characterisation of a 15 Mb constitutional de novo interstitial deletion of chromosome 3p in a boy with developmental delay and congenital anomalies.

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  • 1Institute of Medical Biology and Human Genetics, Karl-Franzens University of Graz, Harrachgasse 21/8, A-8010 Graz, Austria. petek@kfunigraz.ac.at

Abstract

We describe the case of a 22-month-old boy with developmental and psychomotor retardation as well as craniofacial dysmorphism, including a cleft lip. Analysis of G-banded chromosomes of the propositus showed a de novo interstitial deletion of the short arm of chromosome 3, del(3)(p13p11). Fine mapping of the deletion was performed using fluorescence in situ hybridisation analysis with region-specific BAC clones. Eight BACs were absent from one chromosome 3 from the patient. Molecular analyses of eleven polymorphic DNA markers helped to narrow down the breakpoints and demonstrated that the derivative chromosome 3 is of paternal origin. The deleted segment encompasses about 15 Mb between marker D3S3551 and the centromere. Only a small number of known genes, including PROK2, GPR27, RYBP, PPP4R2, ROBO1, and GBE1, which map in the 3p13-p11 region are included in the deletion.

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