The characterization of a prenatally detected very small (approximately half of 18p-(karyotype: 47,XX,+mar[16]/46,XX[7]) supernumerary marker chromosome (SMC) identified by GTG-banding analysis is described. The marker has been identified as derived from chromosome 8 centromeric material using a combination of different cytogenetic (GTG-, NOR-, CBG banding), molecular cytogenetic (24 colour-fluorescent in situ hybridization [FISH], three-colour FISH using centromeric probes for all human chromosomes) and molecular genetic techniques (microsatellite analysis). This is the first case described with such a minute SMC derived from chromosome 8 diagnosed prenatally, the 15th case reporting on a SMC originating from chromosome 8 and the third such case without any severe clinical features.
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