J Chin Med Assoc. 2010 Apr;73(4):205-7.

Small supernumerary marker chromosomes 1 with a normal phenotype.

Liehr T, Wegner RD, Stumm M, Martin T, Gillessen-Kaesbach G, Kosyakova N, Ewers E, Hamid AB, von Eggeling F, Hentschel J, Ziegler M, Weise A.

Source

Jena University Hospital, Institute of Human Genetics and Anthropology, Germany. i8lith@mti.uni-jena.de

Abstract

Small supernumerary marker chromosomes (sSMCs) are a major problem in prenatal cytogenetic diagnostics. Over two-thirds of cases carrying an sSMC derived from chromosome 1 are associated with clinical abnormalities. We report 3 further cases of such sSMCs that did not show any clinical abnormalities. All 3 sSMCs studied were detected prenatally and characterized comprehensively for their genetic content by molecular cytogenetics using subcentromere-specific multicolor fluorescence in situ hybridization, and for a possibly associated uniparental disomy. After exclusion of additional euchromatin due to the presence of sSMCs and a uniparental disomy, parents opted for continuation of the pregnancies and healthy children were born in all 3 cases. It is important to quickly and clearly characterize prenatal sSMCs. Also, all available sSMC cases need to be collected on a homepage such as the Jena Institute of Human Genetics and Anthropology sSMC homepage (http://www.med.uni-jena.de/fish/sSMC/00START.htm).

PMID:: 20457442; [PubMed - indexed for MEDLINE]

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